2003STANDARD for                                       PERFORMANCE                                       RATING OF        ...
IMPORTANT                                               SAFETY DISCLAIMER        ARI does not set safety standards and doe...
ARI CERTIFICATION PROGRAM PROVISIONS (CONTINUED)                                Scope of the Certification Program (Contin...
Certified RatingsThe Certification Program ratings verified by test are:         1.       Capacity, tons [kW]         2.  ...
TABLE OF CONTENTSSECTION                                                                                                  ...
TABLES FOR APPENDICESTable D1.    Group 1 Air-Cooled IPLV Data and Calculation ..............................................
ARI STANDARD 550/590-2003      PERFORMANCE RATING OF WATER-CHILLING   PACKAGES USING THE VAPOR COMPRESSION CYCLE          ...
ARI STANDARD 550/590-2003       3.5.3    Heat Reclaim Coefficient of Performance                  3.10.2 Standard Rating. ...
ARI STANDARD 550/590-2003            Section 5. Rating Requirements                       5.4.1    Determination of Part- ...
4                                                               Table 1. Standard Rating Conditions                       ...
Table 2. Heat Reclaim Standard Rating Conditions    Temperature                              Water-Cooled                 ...
ARI STANDARD 550/590-2003                                                   Table 3. Part-Load Conditions for Rating      ...
ARI STANDARD 550/590-20035.4.1.2 The IPLV or NPLV rating requires                          where CD is a degradation facto...
ARI STANDARD 550/590-2003                Because the unit cannot unload to 25%                              5.5.1.2 Evapor...
ARI STANDARD 550/590-2003                        9
ARI STANDARD 550/590-2003     5.6.2    Full Load. To comply with this standard,     published or reported Net Refrigeratio...
ARI STANDARD 550/590 2003Min. Allowable EER =                                                    Max. allowable Total Powe...
ARI STANDARD 550/590-2003     Section 6. Minimum Data Requirements for                  6.2.2   Water-Cooled Condenser Pac...
ARI STANDARD 550/590 2003     6.2.6    Heat Reclaim Condenser(s).                              b.   Model number designati...
ARI STANDARD 550/590-2003                APPENDIX A. REFERENCES - NORMATIVEA.1 Listed here are all standards, handbooks an...
ARI STANDARD 550/590-2003  APPENDIX C. METHOD OF TESTING WATER-CHILLING PACKAGES USING THE VAPOR COMPRESSION CYCLE -      ...
ARI STANDARD 550/590- 2003                    determination of compressor shaft                      C3.2.1 Tests conducte...
ARI STANDARD 550/590-2003            Gas consumption of turbine          C5.1.5 Without Condenser.            or engine, t...
ARI STANDARD 550/590- 2003     C5.2    Auxiliary Data to be Recorded for General     C6.2   Operations and Limits.     Inf...
ARI STANDARD 550/590-2003     average     bulk       stream                                the turbine, and Condenser     ...
ARI STANDARD 550/590- 2003           C6.3.3 The water temperature needed to           simulate the additional fouling, TDa...
ARI STANDARD 550/590-2003 where:                                                      manufacturers certified power       ...
Ari 550 590
Ari 550 590
Ari 550 590
Ari 550 590
Ari 550 590
Ari 550 590
Ari 550 590
Ari 550 590
Ari 550 590
Upcoming SlideShare
Loading in …5
×

Ari 550 590

8,396 views

Published on

Published in: Design, Business
0 Comments
2 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
8,396
On SlideShare
0
From Embeds
0
Number of Embeds
73
Actions
Shares
0
Downloads
329
Comments
0
Likes
2
Embeds 0
No embeds

No notes for slide

Ari 550 590

  1. 1. 2003STANDARD for PERFORMANCE RATING OF WATER - CHILLING PACKAGES USING THE VAPOR COMPRESSION CYCLE Standard 550/590 4100 N. FAIRFAX DR., SUITE 200 • ARLINGTON, VIRGINIA 22203
  2. 2. IMPORTANT SAFETY DISCLAIMER ARI does not set safety standards and does not certify or guarantee the safety of any products, components or systems designed, tested, rated, installed or operated in accordance with this standard/guideline. It is strongly recommended that products be designed, constructed, assembled, installed and operated in accordance with nationally recognized safety standards and code requirements appropriate for products covered by this standard/guideline. ARI uses its best efforts to develop standards/guidelines employing state-of-the-art and accepted industry practices. ARI does not certify or guarantee that any tests conducted under its standards/guidelines will be non-hazardous or free from risk. ARI CERTIFICATION PROGRAM PROVISIONS Scope of the Certification Program 60 Hz Power Included in Certification Program Water-Cooled Air-Cooled All compressor types All compressor types Rated up to 2000 tons [7034 kW] at ARI Standard Rating Rated up to 200 tons [ 703 kW] at ARI Standard Rating Conditions Conditions Hermetic & open type, electric motor driven Hermetic & open type, electric motor driven Voltages up to 5000 volts Voltages up to 600 volts Excluded from Certification Program Water-Cooled Air-Cooled Condenserless chillers Condenserless chillers Evaporatively cooled chillers Evaporatively cooled chillers Chillers above 2000 tons [7034 kW] Chillers above 200 tons [703 kW] Chillers with voltages above 5000 volts Chillers with voltages above 600 volts Chillers powered by other than electric motor drives Chillers powered by other than electric motor drives Chillers with motors not supplied with the unit by Secondary coolant ratings (other than water) The manufacturer Free cooling Secondary coolant ratings (other than water) Heat recovery & heat pump ratings Free cooling Heat recovery & heat pump ratingsPrice $10.00 (M) $20.00 (NM) Copyright 2003, by Air-Conditioning and Refrigeration InstitutePrinted in U.S.A. Registered United States Patent and Trademark Office
  3. 3. ARI CERTIFICATION PROGRAM PROVISIONS (CONTINUED) Scope of the Certification Program (Continued) 50 Hz Power Included in Certification Program Water-Cooled Air-CooledCentrifugal & screw chillers with continuous unloadingRated 200 - 1000 tons [703-3517 kW] at ARI StandardRating ConditionsHermetic & open type, electric motor driven Not applicableVoltages up to 5000 volts Excluded from Certification Program Water-Cooled Air-CooledScroll & reciprocating compressor chillerswith step unloadingCondenserless chillersEvaporatively cooled chillers Not applicableChillers below 200 tons [703 kW]Chillers above 1000 tons [3517 kW]Chillers with voltages above 5000 voltsChillers powered by other than electric motor drivesChillers with motors not supplied with the unit byThe manufacturerSecondary coolant ratings (other than water)Free coolingHeat recovery & heat pump ratings
  4. 4. Certified RatingsThe Certification Program ratings verified by test are: 1. Capacity, tons [kW] 2. Energy Efficiency, as applicable: • Power Input per Capacity, kW/ton [kW/kW] • Energy Efficiency Ratio (EER), Btu/(W⋅h) • Coefficient of Performance (COP), watts/watt [W/W] 3. Water pressure drop, psi or ft H2O [kPa] 4. Integrated Part-Load Value (IPLV) (Section 5.4.1) 5. Non-Standard Part-Load Value (NPLV) (Section 5.4.1) Items 1- 5 are at Standard Rating Conditions (Section 5.2) and at non-standard Rating Conditions (Section 5.3) for both full and part load (Section 5.4 for part-load performance requirements). Note: This standard supersedes ARI Standard 550/590-98 with addenda.
  5. 5. TABLE OF CONTENTSSECTION PAGESection 1. Purpose ..............................................................................................................................1Section 2. Scope .................................................................................................................................1Section 3. Definitions .........................................................................................................................1Section 4. Test Requirements .............................................................................................................2Section 5. Rating Requirements .........................................................................................................3Section 6. Minimum Data Requirements for Published Ratings......................................................12Section 7. Marking and Nameplate Data..........................................................................................13Section 8. Conformance Conditions ...............................................................................................13 TABLESTable 1. Standard Rating Conditions...............................................................................................4Table 2. Heat Reclaim Standard Rating Conditions........................................................................5Table 3. Part-Load Conditions for Rating .......................................................................................6 FIGURESFigure 1. Part-Load Efficiency Curve...............................................................................................7Figure 2. Air-Cooled Condenser Entering Air Temperature vs. % Load .........................................9Figure 3. Allowable Tolerance Curves for Full and Part Load ........................................................9Figure 4. IPLV and NPLV Tolerance Curve .................................................................................11 APPENDICESAppendix A. References - Normative...................................................................................................14Appendix B. References - Informative .................................................................................................14Appendix C. Method of Testing Water Chilling Packages Using the Vapor Compression Cycle - Normative..........................................15Appendix D. Derivation of Integrated Part-Load Value (IPLV) - Normative......................................24
  6. 6. TABLES FOR APPENDICESTable D1. Group 1 Air-Cooled IPLV Data and Calculation ............................................................28Table D2. Group 1 Water-Cooled IPLV Data and Calculation........................................................29Table D3. Group 1 - 4 IPLV Summary ............................................................................................30 FIGURES FOR APPENDICESFigure D1. Ton-Hour Distribution Categories...................................................................................25Figure D2. Bin Groupings – Ton-Hours............................................................................................26Figure D3. Group 1 Ton-Hour Distribution Categories ....................................................................26Figure D4. Group 2 Ton-Hour Distribution Categories ....................................................................26
  7. 7. ARI STANDARD 550/590-2003 PERFORMANCE RATING OF WATER-CHILLING PACKAGES USING THE VAPOR COMPRESSION CYCLE Section 1. Purpose 3.3 Condenser. A refrigeration system component which condenses refrigerant vapor. Desuperheating and sub-1.1 Purpose. The purpose of this standard is to establish cooling of the refrigerant may occur as well.for Water-Chilling Packages using the vapor compressioncycle: definitions; test requirements; rating requirements; 3.3.1 Air-Cooled Condenser. A component whichminimum data requirements for Published Ratings; marking condenses refrigerant vapor by rejecting heat to airand nameplate data; and conformance conditions. mechanically circulated over its heat transfer surface causing a rise in the air temperature. 1.1.1 Intent. This standard is intended for the guidance of the industry, including manufacturers, 3.3.2 Air-Cooled Heat Reclaim Condenser. A engineers, installers, contractors and users. component which condenses refrigerant vapor in the process of rejecting the heat of condensation to air 1.1.2 Review and Amendment. This standard is causing a rise in the air temperature. This Condenser subject to review and amendment as technology may be a separate Condenser the same as or a portion advances. of the Air-Cooled Condenser. 3.3.3 Evaporatively-Cooled Condenser. A Section 2. Scope component which condenses refrigerant vapor by rejecting heat to a water and air mixture mechanically2.1 Scope. This standard applies to factory-made vapor circulated over its heat transfer surface, causingcompression refrigeration Water-Chilling Packages evaporation of the water and an increase in theincluding one or more hermetic or open drive compressors. enthalpy of the air.These Water-Chilling Packages include: 3.3.4 Water-Cooled Condenser. A component • Water-Cooled, Air-Cooled, or Evaporatively- which utilizes refrigerant-to-water heat transfer Cooled Condensers, means, causing the refrigerant to condense and the • Air-Cooled or Water-Cooled Heat Reclaim water to be heated. Condensers, • Packages supplied without a Condenser. 3.3.5 Water-Cooled Heat Reclaim Condenser. A component which utilizes refrigerant-to-water heat transfer means, causing the refrigerant to condense Section 3. Definitions and the water to be heated. This Condenser may be a separate condenser, the same as, or a portion of theAll terms in this document follow the standard industry Water-Cooled Condenser.definitions in the current edition of ASHRAE Terminologyof Heating, Ventilation, Air Conditioning and Refrigeration 3.4 Dew Point. Refrigerant vapor saturation temperatureunless otherwise defined in this section. at a specified pressure.3.1 Bubble Point. Refrigerant liquid saturation 3.5 Energy Efficiency.temperature at a specified pressure. 3.5.1 Coefficient of Performance (COP). A ratio3.2 Compressor Saturated Discharge Temperature. For of the cooling capacity in watts [W] to the Totalsingle component and azeotrope refrigerants, it is the Power Input, in watts [W] at any given set of Ratingsaturated temperature corresponding to the refrigerant Conditions, expressed in watts/watt [W/W].pressure at the compressor discharge. For zeotropicrefrigerants, it is the arithmetic average of the Dew Point 3.5.2 Energy Efficiency Ratio (EER). A ratio ofand Bubble Point temperatures corresponding to refrigerant the cooling capacity in Btu/h [W] to the Total Powerpressure at the compressor discharge. It is usually taken at Input in watts [W] at any given set of Ratingor immediately downstream of the compressor discharge Conditions, expressed in Btu/(W⋅h).service valve (in either case on the downstream side of thevalve seat), where discharge valves are used. 1
  8. 8. ARI STANDARD 550/590-2003 3.5.3 Heat Reclaim Coefficient of Performance 3.10.2 Standard Rating. A rating based on tests (COPHR). A ratio of the Net Heat Reclaim Capacity performed at Standard Rating Conditions. (Btu/h) to the Total Power Input to the unit, W converted to Btu/h 3.11 Rating Conditions. Any set of operating conditions under which a single level of performance results and which 3.5.4 Power Input per Capacity. A ratio of the causes only that level of performance to occur. Total Power Input to the unit, in kW to the Net Refrigerating Capacity at any given set of Rating 3.1.1 Standard Rating Conditions. Rating Conditions, expressed in kW/ton [kW/kW]. Conditions used as the basis of comparison for performance characteristics.3.6 Fouling Factor. The thermal resistance due tofouling accumulated on the heat transfer surface. 3.12 "Shall" or "Should". "Shall" or "should" shall be interpreted as follows: 3.6.1 Fouling Factor Allowance. Provision for anticipated fouling during use specified in 3.12.1 Shall. Where "shall" or "shall not" is used h⋅ft2⋅ºF/Btu [m2⋅ºC/W]. for a provision specified, that provision is mandatory if compliance with the standard is claimed.3.7 Net Heat Reclaim Capacity. A quantity defined asthe mass flow rate of the condenser water multiplied by the 3.12.2 Should, "Should" is used to indicatedifference in enthalpy of water entering and leaving the heat provisions which are not mandatory but which arereclaim Condenser, Btu/h [kW]. desirable as good practice.3.8 Net Refrigeration Capacity. A quantity defined as 3.13 Total Power Input. Power input of all components ofthe mass flow rate of the evaporator water multiplied by the the unit.difference in enthalpy of water entering and leaving theevaporator, Btu/h or tons [kW]. 3.14 Water-Chilling Package. A factory-made and prefabricated assembly (not necessarily shipped as one3.9 Part-Load Value (PLV). A single number figure of package) of one or more compressors, Condensers andmerit expressing part-load efficiency for equipment on the evaporators, with interconnections and accessories, designedbasis of weighted operation at various partial load capacities for the purpose of cooling water. It is a machine specificallyfor the equipment. designed to make use of a vapor compression refrigeration cycle to remove heat from water and reject the heat to a 3.9.1 Integrated Part-Load Value (IPLV). A cooling medium, usually air or water. The refrigerant single number part-load efficiency figure of merit Condenser may or may not be an integral part of the calculated per the method described in this standard package. at Standard Rating Conditions. 3.14.1 Heat Reclaim Water-Chilling Package. A 3.9.2 Non-Standard Part-Load Value (NPLV). A factory-made package, designed for the purpose of single number part-load efficiency figure of merit chilling water and containing a Condenser for calculated per the method described in this standard reclaiming heat. Where such equipment is provided referenced to conditions other than IPLV conditions. in more than one assembly, the separate assemblies (For units that are not designed to operate at Standard are to be designed to be used together, and the Rating Conditions.) requirements of rating outlined in this standard are based upon the use of matched assemblies. It is a3.10 Published Ratings. A statement of the assigned package specifically designed to make use of thevalues of those performance characteristics, under stated refrigerant cycle to remove heat from the refrigerantRating Conditions, by which a unit may be chosen to fit its and to reject the heat to another fluid (air or water)application. These values apply to all units of like nominal for heating use. Any excess heat may be rejected tosize and type (identification) produced by the same another medium, usually air or water.manufacturer. The term Published Rating includes therating of all performance characteristics shown on the unitor published in specifications, advertising or other literature Section 4. Test Requirementscontrolled by the manufacturer, at stated Rating Conditions. 4.1 Test Requirements. Ratings shall be established at 3.10.1 Application Rating. A rating based on tests the Rating Conditions specified in Section 5. Ratings shall performed at application Rating Conditions (other be verified by tests conducted in accordance with the test than Standard Rating Conditions). method and procedures described in Appendix C.2
  9. 9. ARI STANDARD 550/590-2003 Section 5. Rating Requirements 5.4.1 Determination of Part- Load Performance. For Water-Chilling Packages covered by this5.1 Standard Ratings. Standard Ratings for all Water- standard, the IPLV or NPLV shall be calculated asChilling Packages shall be established at the Standard follows:Rating Conditions specified in 5.2. a. Determine the part-load energy5.2 Standard Rating Conditions. Water-Chilling efficiency at 100%, 75%, 50%, andPackages shall be rated at conditions specified in Table 1. 25% load points at the conditionsHeat Reclaim Water-Chilling Packages shall be rated at specified in Table 3.conditions specified in Table 2 and properly identified as theHeat Reclaim Standard Rating. Standard Ratings shall b. Use the following equation to calculateinclude a water-side Fouling Factor Allowance of 0.00025 the IPLV or NPLV.h⋅ft2⋅ºF/Btu [0.000044 m2⋅ºC/W] for the Condenser and0.0001 h⋅ft2 ⋅ºF/Btu [0.000018m2⋅ºC/W] for the evaporator. IPLV or = 0.01A + 0.42B + 0.45C + 0.12D NPLV 1a5.3 Application Rating Conditions. Application Ratingsshould include the following range of Rating Conditions orbe within the operating limits of the equipment: For COP and EER:All Condenser Types: where: A = COP or EER at 100% Leaving chilled water temperature ......40.0 to 48.0ºF B = COP or EER at 75% [4.4 to 8.9ºC] in increments of 2ºF or less [1ºC or C = COP or EER at 50% less]. D = COP or EER at 25%Water-Cooled Condensers: For kW/ton: Entering condenser water temperature ......65.0 to 105.0ºF [18.3 to 40.6ºC] in increments of 5ºF or less IPLV 1 [3°C or less]. or = 1b NPLV 0.01 + 0.42 + 0.45 + 0.12Air-Cooled Condensers: A B C D Entering Condenser air dry-bulb temperature ......55.0 to 125.0°F [12.8 to 51.7°C] dry-bulb in increments of 10°F or less [6°C or less]. where: A= kW/Ton at 100% B= kW/Ton at 75%Evaporatively-Cooled Condensers: C= kW/Ton at 50% D= kW/Ton at 25% Entering Condenser air wet-bulb temperature ......50.0 to 80.0°F [10.0 to 26.7°C] wet-bulb in 5.4.1.1 For a derivation of equations 1a increments of 2.5°F or less [1.4°C or less]. and 1b, and an example of an IPLV or NPLV calculation, see Appendix D. The5.4 Part-Load Rating. Water-Chilling Packages which weighting factors have been based on theare capable of capacity reduction shall be rated at 100% and weighted average of the most commonat each step of capacity reduction provided by the building types and operations using averagerefrigeration system(s) as published by the manufacturer. weather in 29 U.S. cities, with and withoutPart-load ratings points shall be presented in one or more of airside economizers.the following three ways: a. IPLV- Based on the conditions defined in Table 3. b. NPLV- Based on the conditions defined in Table 3. c. Separate Part-Load Data Point(s) Suitable for Calculating IPLV or NPLV. In addition, other part-load points may also be presented. 3
  10. 10. 4 Table 1. Standard Rating Conditions Water-Cooled Evaporatively-Cooled Air-Cooled Condenser Water Entering 85.0 ºF 29.4 ºC Flow Rate 3.0 gpm/ton 0.054 L/s per kW ARI STANDARD 550/590-2003 Condenser Fouling Factor Allowance Water-Side 0.00025 h · ft2 · ºF/Btu 0.000044 m2 · ºC/ W Air-Side 0.0 ft2 · ºF/Btu 0.0 m2 · ºC/W 0.0 h · ft2 · ºF/Btu 0.0 m2 · ºC/W Entering Air Dry-Bulb 95.0 ºF 35.0 ºC Wet-Bulb 75.0 ºF 23.9 ºC Evaporator Water Leaving 44.0 ºF 6.7 ºC 44.0 ºF 6.7 ºC 44.0 ºF 6.7 ºC Flow Rate 2.4 gpm/ton 0.043 L/s per kW 2.4 gpm/ton 0.043 L/s per kW 2.4 gpm/ton 0.043 L/s per kW Evaporator Fouling Factor Allowance Water-Side 0.0001 h · ft2 ºF/Btu 0.000018 m2 · ºC/W 0.0001 h · ft2 ºF/Btu 0.000018 m2 · ºC/W 0.0001 h · ft2 ºF/Btu 0.000018 m2 · ºC/W Without Condenser Saturated Discharge 105.0 ºF 40.6 ºC 105.0 ºF 40.6 ºC 125.0 ºF 51.7 ºC Liquid Refrigerant 98.0 ºF 36.7 ºC 98.0 ºF 36.7 ºC 105.0 ºF 40.6 ºC Barometric Pressure 29.92 in Hg 101.3 kPa 29.92 in Hg 101.3 kPa 29.92 in Hg 101.3 kPa
  11. 11. Table 2. Heat Reclaim Standard Rating Conditions Temperature Water-Cooled Evaporatively-Cooled Air-Cooled Condenser Water Entering 75.0 ºF 23.9 ºC Flow rate same as in standard cooling Flow rate same as in standard Flow rate same as in standard Flow Rate ratings cooling ratings cooling ratings Entering Air Dry-Bulb 40.0 ºF 4.4 ºC Wet-Bulb 38.0 ºF 3.3 ºC Evaporator Water Leaving 44.0 ºF 6.7ºC 44.0 ºF 6.7ºC 44.0 ºF 6.7ºC Field Fouling Allowance 0.00025 h · ft2 · ºF/Btu 0.0 h · ft2 · ºF/Btu 0.0 h · ft2 · ºF/Btu Heat Reclaim Condenser 105.0 ºF 40.6 ºC Entering or or 70.0 ºF 21.1ºC 95.0 ºF 35.0 ºC 120.0 ºF 48.9 ºC Leaving or or 95.0 ºF 35.0 ºC 105.0 ºF 40.6 ºC Barometric Pressure 29.92 in Hg 101.3 kPa 29.92 in Hg 101.3 kPa 29.92 in Hg 101.3 kPa ARI STANDARD 550/590-20035
  12. 12. ARI STANDARD 550/590-2003 Table 3. Part-Load Conditions for Rating IPLV NPLVEvaporator (All Types) 2 2 2100% load LWT 44.0 ºF 6.7 ºC Selected LWT Selected LWT0% load LWT 44.0 ºF 6.7 ºC Same as 100% load Same as 100% load 3 3 3Flow Rate (gpm) 2.4 gpm/ton 0.043 L/s per kW Selected gpm/ton [L/s per kW]F.F.A. 0.0001 h · ft2 · ºF/Btu 0.000018 m2 · ºC/ W As Specified As Specified1 Water-Cooled Condenser 2 2 2100% load EWT 85.0ºF 29.4 ºC Selected EWT Selected EWT 4 475% load EWT 75.0 ºF 23.9 ºC 4 450% load EWT 65.0 ºF 18.3 ºC 4 425% load EWT 65.0 ºF 18.3 ºC0% load EWT 65.0 ºF 18.3 ºC 65.0 ºF 18.3 ºC 3 3 3Flow rate (gpm) [L/s] 3.0 gpm/ton 0.054 L/s per kW Selected gpm/ton L/s per kWF.F.A. 0.00025 h · ft2 · ºF/Btu 0.000044 m2 · ºC/ W As Specified As Specified1 Air-Cooled Condenser (Use Figure 2)100% load EDB 95.0 ºF 35.0 ºC75% load EDB 80.0 ºF 26.7 ºC50% load EDB 65.0 ºF 18.3 ºC No Rating Requirements25% load EDB 55.0 ºF 12.8 ºC0% load EDB 55.0 ºF 12.8 ºCF.F.A. 0.0 h⋅ft2⋅ºF/Btu 0.0 m2⋅ºC/W1 Evaporatively-Cooled Condenser100% load EWB 75.0 ºF 23.9 ºC No Rating Requirements0% load EWB 50.0 ºF 10.0 ºCF.F.A. 0.0 h⋅ft2⋅ºF/Btu 0.0 m2⋅ºC/WAir-Cooled Without Condenser100% load SDT 125.0 ºF 51.7 ºC No Rating Requirements0% load SDT 55.0 ºF 12.8 ºCWater and Evaporatively-CooledWithout Condenser No Rating Requirements100% load SDT 105.0 ºF 40.6 ºC0% load SDT 65.0 ºF 18.3 ºC1 If the unit Manufacturer’s recommended minimum temperatures are greater than those specified in Table 3, then those may be used in lieu of the specified temperatures.2 Corrected for Fouling Factor Allowance by using the calculation method described in C6.33 The flow rates are to be held constant at full load values for all part-load conditions.4 For part-load entering condenser water temperatures, the temperature should vary linearly from the selected EWT at 100% load to 65.0 ºF at 50% loads, and fixed at 65.0°F for 50% to 0% loads.SDT - saturated discharge temperatureLWT - leaving water (liquid) temperatureEWT - entering water (liquid) temperatureEDB - entering air dry-bulb temperatureEWB - entering air wet-bulb temperatureF.F.A. - Fouling Factor Allowance 6
  13. 13. ARI STANDARD 550/590-20035.4.1.2 The IPLV or NPLV rating requires where CD is a degradation factor tothat the unit efficiency be determined at account for cycling of the compressor for100%, 75%, 50% and 25% at the conditions capacities less than the minimum step ofas specified in Table 3. If the unit, due to its capacity. CD should be calculated usingcapacity control logic can not be operated at the following equation:75%, 50%, or 25% capacity then the unitshall be operated at other load points and the C D = (-0.13 ⋅ LF) + 1.1375%, 50%, or 25% capacity efficiencies shallbe determined by plotting the efficiency where LF is the load factor calculatedversus the % load using straight line using the following equation:segments to connect the actual performancepoints (Figure 1). The 75%, 50%, or 25% % FLload efficiencies shall then be determined ⋅ (Full load unit capacity)from the curve. Extrapolation of data shall LF = 100not be used. An actual chiller capacity point (Part − load unit capacity)equal to or less than the required rating pointmust be used to plot the data. For example,if the minimum actual capacity is 33% then where % FL is the % of full load atthe curve can be used to determine the 50% standard rating points, i.e. 75%, 50%, andcapacity point, but not the 25% capacity 25%.point. Part-Load unit capacity is the measured or calculated unit capacity from which Standard Rating points are determined using the method above. 5.4.1.3 Sample Calculation. The following is an example of an IPLV calculation: Part-Load Values Provided Step Capacity Input EER (tons) (kW) 3 (full) 100.0 92.3 13.00 2 72.1 57.4 15.07If a unit cannot be unloaded to the 25%, 1* 41.3 31.3 15.8350%, or 75% capacity point, then the unitshall be run at the minimum step of 1** 41.8 33.3 15.06unloading at the condenser entering water or * Minimum possible unit capacity at load conditions.air temperature based on Table 3 for 25%, ** Performance at minimum step at 25% load conditions50% or 75% capacity points as required. Theefficiency shall then be determined by using Using the above data the part-load EER valuethe following equation: can be calculated. Measured Cooling CapacityEER = 2 Part-Load Values Provided C D ⋅ Measured Total Power Input Point Load% Capacity EER (tons) A 100% 100 13.00 B 75% 75 14.85 C 50% 50 15.62 7
  14. 14. ARI STANDARD 550/590-2003 Because the unit cannot unload to 25% 5.5.1.2 Evaporator water-side and capacity, the following additional condenser water-side or air-side heat calculations are required to determine point transfer surfaces shall be considered clean “D”, using the minimum capacity data point during testing. Tests will be assumed to listed above that was determined at the reflect Fouling Factors of 0.0 h⋅ft2 °F/Btu minimum step of capacity at the conditions [0.0 m2°C/W]. of a 25% capacity. 5.5.1.3 To determine the capacity of the (0.25) x (100) Water-Chilling Package at the rated LF = = 0.60 fouling conditions, the procedure defined 41.8 in C6.3 shall be used to determine an adjustment for the evaporator and or CD = (-0.13 x 0.60) + 1.13 = 1.05 condenser water temperatures. 41.8 x 12000 Btu 5.6 Tolerances. EER = = 14.35 1.05 x 33.3 x 1000 (W ⋅ h ) 5.6.1 Allowable Tolerances. The allowable test Using the A, B, C and D efficiencies the tolerance on capacity, tons [kW], EER, COP, Power IPLV can then be calculated as follows: Input per Capacity kW/ton [kW/kW] and heat balance shall be determined from the following IPLV (EER) = (0.01 x 13.00) + (0.42 x equation: 14.85) + ( 0.45 x 15.62) + (0.12 x 14.35) Tolerance % =15.12 Btu/(W⋅h) E = 10.5 - (0.07 x % FL) + ( )5.5 Fouling Factor Allowances. When ratings are DTFL x % FLpublished, they shall include those with Fouling Factors asspecified in Table 1. Additional ratings, or means of DTFL = Difference between entering anddetermining those ratings, at other Fouling Factor Allowances leaving chilled water temperature atmay also be published. full load, °F [°C] 5.5.1 Method of Establishing Clean and Fouled E = 1500 for IP, [833.3] for SI units Ratings from Laboratory Test Data. See Figure 3 for graphical representation only. 5.5.1.1 A series of tests shall be run in accordance with the method outlined in Appendix C to establish the unit’s performance.8
  15. 15. ARI STANDARD 550/590-2003 9
  16. 16. ARI STANDARD 550/590-2003 5.6.2 Full Load. To comply with this standard, published or reported Net Refrigeration Capacity Rated full load performance shall be based on data obtained in accordance with the provisions of this section, and shall have a Net Rated capacity = 100 tons Refrigeration Capacity and full load efficiency of not Rated power = 70 kW less than 100 % of its ratings within the allowable Cooling DTFL = 10ºF tolerance. The allowable tolerance shall be determined by the equation specified in 5.6.1. kW Total Power Input per Capacity = 0.70 ton Water pressure drop in the evaporator and Condenser shall not exceed 115 % of the rated pressure drop at Allowable Test Tolerance: the specified water flow rate. (1500) Full Load Example in EER (in IP Units only for Tolerance = 10.5 - (.07 x 100) + clarity): (10 x 100) Rated Full Load Performance = 10.5 – 0 7 + 1.5 = 5% Rated Capacity = 100 tons (100 − 5) Rated Power = 92.3 kW Min. allowable capacity = x 100 100 Evaporator DTFL = 10°F = 95 tons 100 tons x 12000 Btu/ton ⋅ h Btu EER = = 13.0 92.3 kW x 1000W/kW (W ⋅ h) (100 + 5) Max. allowable kW / ton = x .70 Allowable Test Tolerance = 100 = .735 kW/ton 1500 10.5 - (0.07 x 100%) + 10 x 100% Max. power at min. capacity = 10.5 - 7 + 1.5 = 5% = .735 x 95 = 69.825 kW Min. Allowable Capacity = 5.6.3 Part-Load. The tolerance on part-load EER shall be the tolerance as determined from 5.6.1. (100 tons − 5 tons ) x 100 = 95 tons 100 Part-Load Example in EER (in IP Units only for clarity): Min. Allowable EER = Rated Part-Load Performance (100 - 5) x 13.0 Btu = 12.35 Btu Power at 69.5% Rated Capacity = 59.6 kW 100 (W ⋅ h) (W ⋅ h) 69.5% Rated Capacity = 69.5 tons Cooling DTFL = 10.0°F Max. power at min. capacity = 69.5 x 12000 Btu EER = = 14.0 95 tons x 12000 Btu/ton ⋅ h 59.6 x 1000 (W ⋅ h) = 92.3 kW Btu 12.35 x 1000 (W ⋅ h) Allowable Test Tolerance = 1500 10.5 − (0.07 ⋅ 69.5%) + 10 x 69.5% Full Load Example in kW/ton (in IP Units only for clarity): = 10.5 - 4.87 + 2.16 = 7.8%10
  17. 17. ARI STANDARD 550/590 2003Min. Allowable EER = Max. allowable Total Power Input per Ton(100 - 7.8) x 14.0 = 12.91 EER 100 (100 + 10%) = x .70 100Part-Load Example in kW/ton (in IP Units only for = 0.77 kW/tonclarity): 5.6.4 IPLV and NPLV Tolerances. The allowableRated Part-Load Performance tolerance on IPLV and NPLV shall be determined by the following equation:50% capacity = 50 tons 3550% power = 35 kW Allowable Percent Tolerance = 6.5 +Total Power Input per Ton = 0.70 kW/ton DTFLFull Load DTFL = 10ºF See Figure 4Allowable Test Performance The single number IPLV or NPLV, calculated for the (1500) part-load conditions, shall not be less than the rated Tolerance = 10.5 - (.07 x 50) + IPLV or NPLV, less the allowable tolerance. 10 x 50 = 10.5 - 3.5 + 3 = 10% 11
  18. 18. ARI STANDARD 550/590-2003 Section 6. Minimum Data Requirements for 6.2.2 Water-Cooled Condenser Packages. Published Ratings 6.2.2.1 Condenser water pressure drop6.1 Minimum Data Requirements for Published Ratings. (inlet to outlet), psi or ft H2O [kPa].As a minimum, Published Ratings shall include all StandardRatings. All claims to ratings within the scope of this 6.2.2.2 Any two of the following:standard shall include the statement "Rated in accordancewith ARI Standard 550/590." All claims to ratings outside Entering condenser water temperature, ºFthe scope of the standard shall include the statement [ºC]"Outside the scope of ARI Standard 550/590." Wherever Leaving condenser water temperature, ºFApplication Ratings are published or printed, they shall [ºC]include a statement of the conditions at which the ratings Water temperature rise through theapply. condenser, ºF [ºC]6.2 Published Ratings. Published Ratings shall state all of 6.2.2.3 Condenser water flow rate, gpmthe standard operating conditions and shall include the [L/s].following. 6.2.2.4 Condenser Fouling Factor, 6.2.1 General. h · ft2 · ºF/Btu [m2 · ºC/ W], as stated in Table 1. 6.2.1.1 Refrigerant designation in accordance with ANSI/ASHRAE Standard 6.2.3 Air-Cooled Condenser Packages. 34. 6.2.3.1 Entering air dry-bulb temperature, 6.2.1.2 Model number designations ºF [ºC] (as stated in Table 1). providing identification of the Water- Chilling Packages to which the ratings shall 6.2.3.2 Power input to fan(s), kW [kW]. apply. 6.2.4 Evaporatively-Cooled Condenser Packages. 6.2.1.3 Net Refrigeration Capacity, tons [kW]. 6.2.4.1 Entering air wet-bulb temperature, ºF [ºC] (as stated in Table 1). 6.2.1.4 Total Power Input to chiller, bhp or kW, as applicable. 6.2.4.2 Power input to fan(s) and pump(s), kW [kW]. 6.2.1.5 Energy Efficiency, expressed as EER, COP or kW/ton. 6.2.4.3 Condenser spray pump power consumption, kW [kW]. 6.2.1.6 Evaporator Fouling Factor, h · ft2 · ºF/Btu [m2 · ºC/ W], as stated in 6.2.4.4 Statement of Condenser Fouling Table 1. Factor Allowance on heat exchanger, h · ft2 · ºF/Btu [m2 · ºC/ W]. 6.2.1.7 Chilled water entering and leaving temperatures, ºF [ºC] (as stated in Table 1), 6.2.5 Packages without Condenser (for use with or leaving water temperature and Remote Condensers). temperature difference, ºF [ºC]. 6.2.5.1 Compressor saturated discharge 6.2.1.8 Evaporator water pressure drop temperature, ºF [ºC] (as stated in Table 1). (inlet to outlet), psi or ft H2O [kPa]. 6.2.5.2 Liquid refrigerant temperature 6.2.1.9 Chilled water flow rate, gpm [L/s]. entering chiller package, ºF [ºC] (as stated in Table 1). 6.2.1.10 Nominal voltage, V, and frequency, Hz, for which ratings are valid. 6.2.5.3 Condenser heat rejection capacity requirements, Btu/h [kW].12
  19. 19. ARI STANDARD 550/590 2003 6.2.6 Heat Reclaim Condenser(s). b. Model number designation providing complete identification 6.2.6.1 Heat Reclaim Capacity, MBtu/h c. Refrigerant designation (in accordance with [kW]. ANSI/ASHRAE Standard 34 d. Voltage, phase and frequency 6.2.6.2 Water pressure drop, psi or ft H2O [kPa] or air pressure drop, in H2O [kPa]. Nameplate voltages for 60 Hertz systems shall include one or more of the equipment nameplate voltage ratings shown 6.2.6.3 Entering and leaving heat reclaim in Table 1 of ARI Standard 110. Nameplate voltages for 50 Condenser air or water temperatures, ºF [ºC] Hertz systems shall include one or more of the utilization (stated in Table 2). voltages shown in Table 1 of IEC Standard Publication 60038. 6.2.6.4 Heat reclaim Condenser air flow rate, cfm [m3/s] or heat reclaim Condenser Section 8. Conformance Conditions water flow rate, gpm [L/s]. 8.1 Conformance. While conformance with this standard 6.2.6.5 Fouling Factor, h · ft2 · ºF/Btu [m2 is voluntary, Conformance shall not be claimed or implied · ºC/ W], as stated in Table 1 (for water heat for products or equipment within the standard’s Purpose reclaim Condensers only). (Section 1) and Scope (Section 2) unless such product claims meet all of the requirements of the standard and all of the testing and rating requirements are measured and Section 7. Marking and Nameplate Data reported in complete compliance with the standard. Any product that has not met all the requirements of the standard7.1 Marking and Nameplate Data. As a minimum, the cannot reference, state, or acknowledge the standard in anynameplate shall display the following: written, oral, or electronic communication. a. Manufacturers name and location 13
  20. 20. ARI STANDARD 550/590-2003 APPENDIX A. REFERENCES - NORMATIVEA.1 Listed here are all standards, handbooks and other A1.4 ARI Standard 110-2002, Air-Conditioningpublications essential to the formation and implementation and Refrigerating Equipment Nameplate Voltages,of the standards. All references in this appendix are 2002, Air-Conditioning and Refrigeration Institute,considered as part of the standard. 4100 North Fairfax Drive, Suite 200, Arlington, VA 22203, U.S.A. A1.1 ANSI/ASHRAE Standard 30-1995, Method of Testing Liquid Chilling Packages, 1995, A1.5 ASHRAE Terminology of Heating American Society of Heating, Refrigeration, and Air- Ventilation, Air Conditioning and Refrigeration, Conditioning Engineers, Inc. ASHRAE, 25 West Second Edition, 1991, American Society of Heating, 43rd Street, 4th Fl., New York, NY, 10036, Refrigeration, and Air-Conditioning Engineers, Inc. U.S.A./1791 Tullie Circle, N.E., Atlanta, Georgia, ASHRAE, 1791 Tullie Circle, N.E., Atlanta, 30329, U.S.A. Georgia, 30329, U.S.A. A1.2 ANSI/ASHRAE Standard 34-2001 with A1.6 ASME Standard PTC 19.2-1987, Addenda, Number Designation and Safety Instruments and Apparatus, Part 2, Pressure Classification of Refrigerants, 2001, American Measurement, 1987, American Society of Society of Heating, Refrigeration, and Air- Mechanical Engineers. ASME, 345 East 47th Street, Conditioning Engineers, Inc., ASHRAE, 25 West New York, NY 10017, U.S.A. 43rd Street, 4th Fl., New York, NY, 10036, U.S.A./1791 Tullie Circle, N.E., Atlanta, Georgia, A1.7 IEC Standard Publication 60038, IEC 30329, U.S.A. Standard Voltages, 1983, International Electrotechnical Commission, rue de Varembe, P.O. A1.3 ANSI/ASHRAE Standard 41.1-86 (RA Box 131, 1211 Geneva 20, Switzerland. 2001), Measurements Guide - Section on Temperature Measurements, 2001, American Society A1.8 ISA Standard RP31.1, Recommended of Heating, Refrigeration, and Air-Conditioning Practice Specification, Installation, and Calibration Engineers, Inc. ASHRAE, 25 West 43rd Street, 4th of Turbine Flowmeters, 1977, Instrument Society of Fl., New York, NY, 10036, U.S.A./1791 Tullie America, ISA, 67 Alexander Drive, P.O. Box 12277, Circle, N.E., Atlanta, Georgia, 30329, U.S.A. Research Triangle Park, NC 27709, U.S.A. APPENDIX B. REFERENCES - INFORMATIVE None.14
  21. 21. ARI STANDARD 550/590-2003 APPENDIX C. METHOD OF TESTING WATER-CHILLING PACKAGES USING THE VAPOR COMPRESSION CYCLE - NORMATIVEC1. Purpose. The purpose of this appendix is to prescribe C5.1.6 for Water-Cooled Heat Reclaima method of testing for Water-Chilling Packages using the Condensers and C5.1.7 for Air-Cooled Heatvapor compression cycle and to verify capacity and power Reclaim Condensers.requirements at a specific set of conditions. C3.1.5.1 For Water-CooledTesting shall occur where instrumentation and load stability Heat Reclaim Condensers, the heatis provided. reclaim capacity shall be determined by obtaining theTesting shall not be conducted in field installations where following data:steady state conditions are difficult to achieve andprovisions for measurement are not made. a. Fluid flow rate, gpm [L/s] b. Temperature differenceC2. Definitions. Definitions for this appendix are between entering and leavingidentical with those in Section 3 of this standard. water °F, [°C]C3. Test Methods. The heat rejected through the heat reclaim Condenser is equal to the C3.1 Test Method. product of the heat reclaim Condenser water flow rate, the C3.1.1 The test will measure net cooling water temperature difference, and capacity (tons of refrigeration) and energy the specific heat of water as requirements, at a specific set of conditions. defined by equation C7. C3.1.2 To confirm that steady-state C3.1.5.2 For Air-Cooled Heat conditions have been established at the Reclaim Condensers, the heat specific set of conditions and within the reclaim capacity shall be tolerances set forth in C6.2.1, three sets of determined by obtaining the data shall be taken, at a minimum of five- following data: minute intervals. To minimize the effects of transient conditions, test readings should be a. Heat Reclaim Condenser air taken as simultaneously as possible. flow rate, standard cfm [m3/s] (for air) C3.1.3 The test shall include a b. Heat reclaim Condenser air measurement of the net heat removed from temperature difference the water as it passes through the evaporator between entering and leaving by determination of the following: air a. Water flow rate, gpm [L/s] The heat rejected through the Air- b. Temperature difference Cooled Heat Reclaim Condenser between entering and leaving is equal to the product of the heat water °F, [°C] reclaim Condenser airflow rate, the air temperature difference, and C3.1.4 The heat removed from the chilled the specific heat of moist air as water is equal to the product of the chilled defined by equation C8. water flow rate, the water temperature difference, and the specific heat of the water C3.1.5.3 The test shall include defined by equation C6. the determination of the compressor power requirement. C3.1.5 If supplied with the Water-Chilling This power shall be determined by Package, the test shall include simultaneous measurement of electrical input to determination of the heat reclaim Condenser the motor drive (see C7.1.4). For capacity by obtaining the data as defined in motors supplied by others, the 15
  22. 22. ARI STANDARD 550/590- 2003 determination of compressor shaft C3.2.1 Tests conducted in accordance horsepower input shall be outlined with this standard may require cleaning (in in the test procedure. For Air- accordance with manufacturers Cooled or Evaporatively-Cooled instructions) of the heat transfer surfaces. Condensers, the test shall include The as tested Fouling Factors shall then be the determination of the assumed to be 0.0 h ⋅ ft2 ⋅ °F/Btu [0.0 m2 ⋅ Condenser fan and Condenser °C/W]. spray pump power requirements. C4 Instrumentation. C3.1.5.4 Non-Electric Drive. Where turbine or engine drive is C4.1 Accuracy of instruments selected shall be in employed, compressor shaft accordance with ANSI/ASHRAE Standard 30. horsepower input shall be determined from steam, gas, or oil C4.2 Temperature measurements shall be made in consumption, at measured supply accordance with ANSI/ASHRAE Standard 41.1. and exhaust conditions and prime mover manufacturers certified C4.3 Flowmeters shall be constructed and performance data. installed in accordance with the applicable portion of ANSI/ASHRAE Standard 30. Turbine flow meters C3.1.6 Test Verification. may be also used in accordance with ISA Standard RP31.1. C3.1.6.1 For the case of Water- Cooled Condensers, in addition to C4.4 Scales for analog meters shall be such that the determination of net heat readings will be at least one-third of full scale removed and energy input deflection. All instruments, including gauges and required, data shall be taken to thermometers shall be calibrated over the range of prepare a heat balance (C6.4.1) to test readings. substantiate the validity of the test. C4.5 Pressure measurements shall be made in C3.1.6.2 For Air-Cooled and accordance with ASME Power Test Code PTC 19.2. Evaporatively- Cooled Condensers, it is impractical to C5 Measurements. measure heat rejection in a test; therefore, a heat balance cannot be C5.1 Data to be Recorded During the Test. calculated. To verify test accuracy, concurrent redundant C5.1.1 Test Data. Compressor/ instrumentation method (C6.4.2) Evaporator (All Condenser Types): shall be used to measure water temperatures, flow rates, and a. Temperature of water entering power inputs. evaporator, °F [°C] b. Temperature of water leaving C3.1.6.3 For heat reclaim units evaporator, °F [°C] with Air-Cooled Condensers or c. Chilled water flow rates, gpm Water-Cooled Condensers, where [L/s] the capacity is not sufficient to d. Power input to compressor fully condense the refrigerant, the electrical power, kW [kW] concurrent redundant instrumentation methods (C6.4.2) Steam consumption of shall be used. turbine, lb/h [kg/h] C3.1.6.4 For heat reclaim units Steam supply pressure, psig with Water-Cooled Condensers [kPa] that fully condense the refrigerant, the heat balance methods (C6.4.1) Steam supply temperature, ºF shall be used. [ºC] Steam exhaust pressure, psig C3.2 Condition of Heat Transfer Surfaces. or in Hg vac [kPa], or16
  23. 23. ARI STANDARD 550/590-2003 Gas consumption of turbine C5.1.5 Without Condenser. or engine, therms or ft3/h, [m3/s] and calorific value, a. Discharge temperature Btu/ft3, [J/L], or leaving compressor, °F [°C] b. Discharge pressure leaving Fuel consumption of diesel or compressor, psig [kPa] gasoline, gal/h [L/s] and c. Liquid refrigerant temperature calorific value, Btu/gal [J/L] entering the expansion device, °F [°C] e. Evaporator water pressure d. Liquid pressure entering the drop (inlet to outlet), psi or ft expansion device, psig [kPa] H2O [kPa] f. Electrical power input to C5.1.6 Water-Cooled Heat Reclaim controls and auxiliary Condenser. equipment, kW [kW] (if not included in d) a. Temperature of heat reclaim entering Condenser water, °FC5.1.2 Water-Cooled Condenser). [°C] b. Temperature of heat reclaim a. Temperature of water entering leaving Condenser water, °F the Condenser, °F [°C] [°C] b. Temperature of water leaving c. Heat reclaim Condenser water the Condenser, °F [°C] flow rate, gpm [L/s] c. Condenser water flow rate, d. Heat reclaim Condenser water gpm [L/s] pressure drop (inlet to outlet), d. Condenser water pressure psi or ft H2O [kPa] drop (inlet to outlet), psi or ft H2O [kPa] C5.1.7 Air-Cooled Heat Reclaim Condenser.C5.1.3 Air-Cooled Condenser. a. Dry-bulb temperature of air a. Dry-bulb temperature of air entering the heat reclaim entering the Condenser, °F Condenser, °F [°C] [°C] b. Dry-bulb temperature of air b. Condenser fan motor power leaving the heat reclaim consumption, kW [kW] Condenser, °F [°C] c. Barometric pressure, in Hg c. Heat reclaim Condenser [kPa] standard air flow rate, cfm, [m3/s]C5.1.4 Evaporatively-Cooled Condenser. d. Barometric pressure, in Hg [kPa] a. Wet-bulb temperature of air entering the Condenser, °F C5.1.8 If chilled water is used to remove [°C] heat from any other source(s) within the b. Condenser fan motor power package, the temperature and flow consumption, kW [kW] measurements of chilled water must be c. Condenser spray pump power made at points so that the measurement consumption, kW [kW] reflects the net package cooling capacity. d. Barometric pressure, in Hg [kPa] C5.1.9 If Condenser water is used to cool the compressor motor or for some other incidental function within the package, the temperature and flow measurements of condenser water must be made at points, so that the measurement reflects the gross package heat rejection. 17
  24. 24. ARI STANDARD 550/590- 2003 C5.2 Auxiliary Data to be Recorded for General C6.2 Operations and Limits. Information. C6.2.1 Start the system and establish the C5.2.1 Nameplate data including make, testing conditions in accordance with the model, size and refrigerant, sufficient to following tolerances and instructions. completely identify the water chiller. Unit voltage and frequency should be recorded. C6.2.1.1 Evaporator (All Condenser Types) C5.2.2 Compressor driver or input rpm for open-type compressors. a. The chilled water flow rate, gpm [L/s], shall not deviate C5.2.3 Ambient temperature at test site, more than + 5% from that °F [°C]. specified. b. The individual readings of C5.2.4 Actual voltage, V, and current, water temperature leaving the Amps, for each phase of all electric motor evaporator shall not vary from drives. the specified values by more than 0.5°F [0.3°C]. Care C.5.2.5 Motor, engine or turbine nameplate must be taken to insure that data. these water temperatures are the average bulk stream C5.2.6 Pressure, in H2O [kPa], temperatures. temperature, °F [°C] and exhaust pressure, c. The leaving chilled water in H2O [kPa] for steam turbine nameplate temperature shall be adjusted data. by an increment calculated per C6.3 corresponding to the C5.2.7 Fuel gas specification for gas specified field fouling turbine drive, including pressure, in H2O allowance required for test. [kPa]. d. Part-load tests for Water- Chilling Packages which have C5.2.8 Heat balance for C6.4. continuous capacity modulation must be taken C5.2.9 Date, place, and time of test. within + 2% of the full load tons at the specified part load C5.2.10 Names of test supervisor and capacity. witnessing personnel. e. For water chillers with discrete steps of capacityC6 Test Procedure. control, the part-load tests shall be taken as close as C6.1 Preparation for Test. practical to the specified part- load capacity as per Table 3. C6.1.1 The Water-Chilling Package, which has been completely connected in C6.2.1.2 Water-Cooled accordance with the manufacturers Condenser. instructions and is ready for normal operation, shall be provided with the a. The water flow rate, gpm necessary instrumentation. [L/s], through the Condenser shall not deviate more than + C6.1.2 The test shall not be started until 5% from that specified. non-condensables have been removed from b. The individual readings of the system. water temperatures entering the refrigerant Condenser C6.1.3 At the manufacturer’s option, shall not vary from the Condenser and cooler surfaces may be specified values by more than cleaned as provided in C3.2.1. 0.5°F [0.3°C]. Care must be taken to insure that these water temperatures are the18
  25. 25. ARI STANDARD 550/590-2003 average bulk stream the turbine, and Condenser temperatures. pressure or vacuum, shall bec. The entering condensing maintained at nameplate water temperature shall be values. adjusted by an increment c. For gas-turbine or gas-engine calculated per C6.3 operating machines, gas corresponding to the specified pressure to turbine or engine, Fouling Factor Allowance. and exhaust back-pressure at the turbine or engine shall beC6.2.1.3 Air-Cooled maintained at nameplateCondenser, Including Heat values.Reclaim. d. In all cases, the governor, if provided, shall be adjusted toa. The average entering air dry- maintain rated compressor bulb temperature to the speed. Condenser shall not vary from the specified values by more C6.3 Method for Simulating Fouling Factor than 1.0°F [0.6°C]. Allowance at Full Load and Part-Load Conditions.b. For heat reclaim Air-Cooled Condensers the Condenser air C6.3.1 Obtain the log mean temperature flow rate shall not deviate difference (LMTD) for the evaporator from that required for test by and/or Condenser using the following more than + 5%. equation at the specified Fouling Factor Allowance (ffsp).C6.2.1.4 Evaporatively-CooledCondenser. R LMTD =  R C1a. The entering air wet-bulb ln 1 +   S temperature shall not vary from the values required for test by more than 0.5°F R = Water temperature range [0.3°C]. = absolute value (twl - twe), °F[°C]C6.2.1.5 Chiller Without S = Small temperature differenceCondenser. = absolute value (ts - twl), °F [°C]a. The saturated discharge C6.3.2 Derivation of LMTD: temperature shall not vary from the values required for (t s − t we ) − (t s − t w1 ) LMTD = test by more than 0.5°F  t − t we  [0.3°C]. ln  s b. The liquid refrigerant  t s − t w1  temperature shall not vary from the specified values by (t w1 − t we ) = more than 1.0°F [0.6°C].  (t − t ) + (t − t )  s w1 w1 we ln    t s − t w1 C6.2.1.6 Miscellaneous.  a. For electrically driven The Incremental LMTD (ILMTD) is machines, voltage and determined using the following equation: frequency at the unit terminals shall be maintained q at the nameplate values within ILMTD = ff sp ( ) C2 A tolerances of + 10% on voltage and + 1% on frequency.b. For steam-turbine driven machines, steam conditions to 19
  26. 26. ARI STANDARD 550/590- 2003 C6.3.3 The water temperature needed to simulate the additional fouling, TDa, can ffsp = 0.00025 now be calculated: q ILMTD = ff sp ( ) TDa = Ssp - Sc C3a A  2,880,000  = 0.00025 R  550    TDa = S sp - z C3b e -1 = 1.31 where: R TD = Ssp - z a e -1 R Z= LMTD - ILMTD where: R Sc = z e −1 R Z= Ssp = Small temperature difference as LMTD - ILMTD specified, °F [°C] Sc = Small temperature difference as 10 tested in cleaned condition, °F[°C] Z= = 1.125 10.2 - 1.31 The water temperature difference, TDa, is 10 TD = 6.0 - 1.125 then added to the Condenser entering water a -1 e temperature or subtracted from the = 6.0 - 4.8 = 1.2°F evaporator leaving water temperature to simulate the additional Fouling Factor. The entering Condenser water temperature for testing is then raised 1.2°F to simulate C6.3.4 Example-Condenser Fouling Inside Tubes (in I.P Units for clarity): the Fouling Factor Allowance of 0.00025 h ⋅ ft2 ⋅ °F/Btu. The entering condenser water Specified Fouling Factor Allowance, temperature will be 85 + 1.2 or 86.2°F. ffsp =0.00025 h ⋅ ft2 ⋅°F/Btu Condenser load, q = 2,880,000 Btu/h C6.4 Test Verification: Specified Condenser leaving water temp, C6.4.1 Heat Balance-Substantiating Test. Twl = 95°F C6.4.1.1 Calculation of Heat Specified Condenser entering water temp, Balance. In most cases, heat Twe = 85 °F losses or heat gain caused by radiation, convection, bearing Inside* tube surface area, Ai = 550 ft2 friction, oil coolers, etc., are relatively small and may or may *(Since fouling is inside tubes in this not be considered in the overall example) heat balance. Saturated condensing temperature, Omitting the effect of the small heat losses and gains mentioned ts = 101 °F above, the general heat balance equation is as follows: Ssp = ts - twl = 101 - 95 = 6 °F qev + Winput = qcd + qhrc R = twl - twe = 95 - 85 = 10 °F R LMTD = ln (1 + R/S) 10 = = 10.2 ln (1 + 10/6)20
  27. 27. ARI STANDARD 550/590-2003 where: manufacturers certified power input/output data shall be used. Winput = compressor work input as defined in C6.4.1.2 through In the case of motor drive: C6.4.1.4 Winput = power measured at C6.4.1.2 In a hermetic motor terminals plus power to package, where the motor is auxiliaries as in C.7.1.4. cooled by refrigerant, chilled water or condenser water, the C6.4.1.5 Percent Heat Balance. motor cooling load will be Heat balance, in %, is defined as: included in the measured condenser load, hence (qev + Winput ) - (qcd + q hrc ) x 100 C4 q cd + q hrc Winput = electrical power input to the compressor motor, Btu/h [kW] For any test of a liquid cooled chiller to be acceptable, the heat C6.4.1.3 In a package using an balance (%) shall be within the open-type compressor with prime allowable tolerance calculated per mover and external gear drive: 5.6 for the applicable conditions. Winput = qprime mover -qgear C6.4.2 Concurrent Redundant Verification Test for Air-Cooled or where: Evaporatively- Cooled Condensers. Winput = Power input to the C6.4.2.1 Capacity Calculation compressor shaft, Method. Calculate the capacity of Btu/h [kW] the cooler using one set of qprime mover = Power delivered by instrumentation. Also calculate prime mover, Btu/h the capacity of the cooler using the [kW] redundant set of instrumentation. qgear = Friction loss in the For a valid test, these two gear box, Btu/h calculated values must agree [kW] within the tolerance specified in Section 5.6. The tested capacityThe value of qprime mover shall be of the machine shall be thedetermined from the power input average of these two values.to prime mover using certified datafrom the prime mover C6.4.2.2 Power Calculationmanufacturer. Method. The power measured by the two sets of instruments mustThe value of qgear shall be be within 2% at all loads. Thedetermined from certified gear tested power of the machine shalllosses provided by the gear be the average of the twomanufacturer. measured powers.C6.4.1.4 In a package using an C6.4.2.3 Efficiency Calculationopen-type compressor with direct Method. Efficiency shall bedrive and the prime mover not calculated using the measuredfurnished by the manufacturer: (averaged) values and must comply within the tolerances ofWinput = power input to the 5.6.compressor shaft, Btu/h [kW] C7 Calculation of ResultsFor determination of Winput forturbine or engine operated C7.1 Capacity and Power.machines, the turbine or engine 21

×