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Data centar cooling using multiple chiller system with r134a
 

Data centar cooling using multiple chiller system with r134a

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    Data centar cooling using multiple chiller system with r134a Data centar cooling using multiple chiller system with r134a Presentation Transcript

    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning ANNUAL MEETING OF THE REGIONAL OZONE NETWORK FOR EUROPE & CENTRAL ASIA BELGRADE, SERBIA, 10-13 MAY 2011 Belgrade, May 10, 2011 Slobodan Pejković 1 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning Highly Efficient Data Centar Cooling Using Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors Dipl.-Ing. Slobodan Pejković Filter Frigo - Serbia E-mail=filfrigo@EUnet.rs Belgrade, May 10, 2011 Slobodan Pejković 2 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning Oil-free twin-turbo centrifugal compressor uses electromagnetic bearings and turbine variable-speed for significant increase of energy efficiency at partial load compared to conventional oil- lubricated centrifugal or screw compressors. Belgrade, May 10, 2011 Slobodan Pejković 3 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning • Each of the three water chillers installed in Telecommunication Data Centar Belgrade in April 2008 has two turbo compressors and total cooling capacity of 1.97 MW. • It has been estimated that in the 2008 cooling season this solution achieved more than 35% energy savings comparing to the previous solution with conventional centrifugal compressors. • We will see the results of preliminary measurement of the working characteristics of chillers and EER-energy efficiency ratio for real working conditions. Belgrade, May 10, 2011 Slobodan Pejković 4 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning Telecommunication Data Centar Belgrade Belgrade, May 10, 2011 Slobodan Pejković 5 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning In the Telecommunication Data Centar Belgrade, back in 1973, water chillers ware installed with the conventional oil lubricated turbo compressor. The water chillers used R 12 as a refrigerant. The old water chillers Belgrade, May 10, 2011 Slobodan Pejković 6 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning Belgrade, May 10, 2011 Slobodan Pejković 7 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning New water chillers with Turbocor compressors Belgrade, May 10, 2011 Slobodan Pejković 8 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning The advantages of new water chillers over the conventional ones are: • High energy efficiency, especially during reduced part-load, by use of the oil-free compressors with the variable-speed turbine and flooded evaporator, • Environmentally friendly refrigerant (R134a), • More efficient heat exchange in the evaporator and condenser (with no oil film causing additional heat resistances), • Higher evaporation temperatures, and therefore higher cooling capacity at the same temperatures of the water in the evaporator, • Silent work and reduced vibrations, • Low starting current (2 to 5 A ), • Light compressor weight (up to 140 kg), • Precise temperature regulation thanks to software controlling the compressor. Belgrade, May 10, 2011 Slobodan Pejković 9 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning Compressor Evaporator Principal operating Condenser scheme for water chiller Belgrade, May 10, 2011 Slobodan Pejković 10 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning Why R134a as a refrigerant?• ODP=0; GWP=1430• Compressor, semihermetic design, is optimized for use with R134a, an environmentally friendly alternative to traditional refrigerants,• Many traditional fluids have become banned and the industry standard R134a might face the same faith in some European countries because of its relatively high global warming potential,• In selection of the working fluid the safety factors often play a dominant role. Belgrade, May 10, 2011 Slobodan Pejković 11 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning Saturation pressure (abs) vs temperature Belgrade, May 10, 2011 Slobodan Pejković 12 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning Belgrade, May 10, 2011 Slobodan Pejković 13 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • . Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning Changes in compressor cooling capacity (from 10% to 100%) is executed in two ways: By changing the speed of the impeller from 20.000 to 48.000 min¯¹- manufacturers data; from 22.500 to 34.000 min¯¹- our measurements. By changing the opening degree of the inlet guide vane – IGV. Impeller It was found that combined IGV regulation has a good performance. Belgrade, May 10, 2011 Slobodan Pejković 14 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning FACILITY REQUIREMENT FOR COOLING • For cooling of equipment and air-conditioning in the building of Telecommunication Data Centar Belgrade, a total cooling capacity is needed of 1.2 MW. For those requirements, three water chillers, with water cooled condensers were selected, each with cooling capacity of 658 kW, in the following work regimes: • Water temperature at the evaporator inlet 14ºC • Water temperature at the evaporator outlet 9ºC Belgrade, May 10, 2011 Slobodan Pejković 15 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning • Water temperature at the condenser inlet 29ºC • Water temperature at the condenser outlet 34ºC • The installed capacity is much higher (1.97 MW) than needed, due to the reason of redundancy safeguards. Processor (Manager 3000), controls the work of all three water chillers. The simultaneous work of all three water chillers was enabled at reduced load, when the electric power consumption has been significantly decreased. Belgrade, May 10, 2011 Slobodan Pejković 16 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning Processor for controlling the work of three water chillers Belgrade, May 10, 2011 Slobodan Pejković 17 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning ESEER = 0.03 • EER100% + 0.33 • EER75% + 0.4 • EER50% + 0.23 • EER25% Water Chiller TECS-HF 2AS Load % 100 66 50 33 Cooling capacity kW 657.4 433.88 328.7 216.94 Total absorbed power kW 128.4 57.5 34.2 20.7 EER Wh/Wh 5.11 7.55 9.61 10.47 Water entering the evaporator °C 14 12.3 11.5 10.6 Water exiting the evaporator °C 9 9 9 9 Water flow through the evaporator m3/h 113.2 Water entering the condenser °C 29.5 26 22 18 Water exiting the condenser °C 34 28.8 24.1 19.4 Water flow through the condenser m3/h 149.7 Calculated operating parameters of the water chiller Belgrade, May 10, 2011 Slobodan Pejković 18 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning• When two water chillers operate at high external temperatures, in order to satisfy the cooling requirement their total cooling capacity is 2 x 612.6 = 1225.2 kW, while the absorbed power is 2 x 139.8 = 279.6 kW. The cooling capacity is less than nominal, and the absorbed power is higher. The condensing temperature is tk = 40ºC.• When all three water chillers operate at decreased speed in order to satisfy the same cooling requirement, their total cooling capacity is 3 x 407.5 = 1222.5 kW, while the absorbed power is 3 x 64.0 = 192.0 kW, that is 31% less. The condensing temperature is tk = 32ºC.• The use of Multiple Chiller System allows unusual redundancy safeguards. 100% 100% 33.3% 31% 80% 50% 50% 80% 23% 60% 33.3% 60% 40% 23% 40% 50% 50% 33.3% 20% 23% 20% 0% 0% Cooling capacity Absorbed power Cooling capacity Absorbed power Water Chiller I Water Chiller II Water Chiller I Water Chiller II Water Chiller III Energy savings Belgrade, May 10, 2011 Slobodan Pejković 19 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning Determination the annual seasonal energy consumption Chiller operates only 240 days a year, 14 hours per day. The first case: work of an old Westinghouse water chiller, with cooling capacity of 1.2 MW. The calculated seasonal electric power consumption is 571,2 MWh during the year. The second case: parallel work of two new water chillers with Turbocor compressors. During that, the third water chiller serves as a reserve. The calculated seasonal energy consumption is 364,8 MWh, which is 36% less than in the first case. The third case: parallel operation of all three new water chillers. The calculated seasonal energy consumption was 212,6 MWh, which is 63% less than in the first case. Annual savings in this operating regime of the water chillers would be $37.650. The current project indicates a simple payback for the third water chiller of approximately 2.5 years. Belgrade, May 10, 2011 Slobodan Pejković 20 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning FACTORY MEASUREMENT OF WATER CHILLER’S WORKING PARAMETERS April 3rd, 2008 test cabin no. 3 Belgrade, May 10, 2011 Slobodan Pejković 21 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning Test cabin no. 3 Belgrade, May 10, 2011 Slobodan Pejković 22 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning Belgrade, May 10, 2011 Slobodan Pejković 23 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning Original factory testing report of the water chiller TECS-HF 2AS Belgrade, May 10, 2011 Slobodan Pejković 24 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning MEASUREMENT OF CHILLER WORKING PARAMETERS IN THE FACILITY August and on October 14th, 2008 Belgrade, May 10, 2011 Slobodan Pejković 25 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning For basic measurement of the water flow rate orifice meter have been used in conection with OVENTROP flow-meter OV-DMC 2 For electrical network characteristics measurement, instrument CHAUVIN ARNOUX C.A 8334 has been used For control measurement of water flow rate, the ultrasonic flow- meter UFM 610P has been used, product of KROHNE Belgrade, May 10, 2011 Slobodan Pejković 26 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning The measurements show that by decreasing the speed of the turbine, power factor - cosφ also decreases, and it increases the percentage of reactive power in apparent power. Results of the electrical parameters measuring (power, cosφ, voltage, current intensity) Belgrade, May 10, 2011 Slobodan Pejković 27 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning For indirect measurements of the speed of turbine, opening degree of inlet guide vane - IGV and for determining the requested load of the water chiller, a computer has been used with the software package from »Danfoss Turbocor Monitoring Tool Version 2.1.0.80«. Belgrade, May 10, 2011 Slobodan Pejković 28 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning Belgrade, May 10, 2011 Slobodan Pejković 29 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning Belgrade, May 10, 2011 Slobodan Pejković 30 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning Water Chiller: TECS-HF 2S Compressors: Date: Φo=658 kW ; Pw=130 kW ; tw=14/9°C TT300 (R134a) 12/08/2008. Outside Air Temperature 37.9ºC Parameters Discharge Pressure [kPag] 702 Condensing Temperature [°C] 32 Discharge Temperature [°C] 38.5 Water Flow (Condenser) [m3/h] 126.3 Water Temp. (Cond. Inlet) [°C] 25.7 Water Temp. Difference-Cond. [K] 3.1 Heating Capacity [kW] 455.3 Suction Pressure [kPag] 290 Suction Temperature [°C] 7.6 Water Flow (Evaporator) [m3/h] 129.8 Water Temp. (Evap. Outlet) [°C] 9.0 Water Temp. Difference-Evap. [K] 2.7 Cooling Capacity [kW] 407.5 Shaft Speed [min-1] 27371 Compressor load [%] 34 IGV (Inlet Guide Vane) open [%] 110 Power Input [kW] 64.0 Cosφ - 0.893 EER - 6.4 Results of measuring the working parameters of water chiller no.2 Belgrade, May 10, 2011 Slobodan Pejković 31 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning Water Chiller: TECS-HF 2S Compressors: Date: Outside Temp. Φo=658 kW ; Pw=130 kW ; tw=14/9°C TT300 (R134a) 14/10/2008. 21°C Parameters / Time 12:48 13:08 13:16 14:15 14:34 15:32 15:37 Discharge Pressure [kPag] 887 793 769 702 618 613 595 Condensing Temperature [°C] 40 36 35 32 28 27 26 Discharge Temperature [°C] 50.5 47.4 41.2 36.2 33.8 32.8 32.0 Water Flow (Condenser) [m3/h] 126.1 125.8 125.6 125.6 125.9 125.8 126.3 Water Temp. (Cond. Inlet) [°C] 26.6 25.2 25.4 24.3 24.0 23.5 23.1 Water Temp. Difference- [K] 5.0 4.7 3.7 2.6 1.8 1.5 1.4 Cond. Heating Capacity [kW] 733.1 687.5 540.4 379.7 263.5 219.4 205.6 Suction Pressure [kPag] 3.0 2.67 2.8 2.89 2.92 2.95 2.98 Suction Temperature [°C] 9.2 5.9 7.0 7.6 8.2 9.1 9.2 Water Flow (Evaporator) [m3/h] 128.5 129.8 129.5 129.8 129.1 128.8 129.4 Water Temp. (Evap. Outlet) [°C] 11.3 8.7 8.7 8.9 8.8 8.8 8.9 Water Temp. Difference- [K] 4.1 3.9 3.2 2.2 1.6 1.4 1.3 Evap. Cooling Capacity [kW] 612.6 588.6 481.9 332.0 240.2 210.0 195.6 3397 Shaft Speed [min-1] 33802 29182 25434 23784 22907 22520 8 Compressor load [%] 90 74.8 42.8 26.8 10 10 11.7 IGV (Inlet Guide Vane) open [%] 110 110 110 110 23.6 8.8 8.8 Power Input [kW] 139.8 130.8 78.5 46.5 30.8 23.2 21.6 Reactive power [kVAR] 60.6 56.9 36.6 26.6 21.3 19.2 18.2 Cosφ - 0.917 0.916 0.906 0.867 0.822 0.771 0.762 EER - 4.4 4.5 6.1 7.1 7.8 9.0 9.1 Results of measuring the working parameters of water chiller no.2 Belgrade, May 10, 2011 Slobodan Pejković 32 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning During the measurement opening degree of inlet guide vane – IGV was changing from 110 to 8.8%, as well as the compressor impeller’s speed from 33978 to 22520 min-1. The efficiency level - EER changed from 4.4 at maximum load to 9.1 at reduced capacity of 34% of the maximum load. By further decrease of load, the efficiency level - EER would also increase. Belgrade, May 10, 2011 Slobodan Pejković 33 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning CONCLUSION Oil-free twin-turbo centrifugal compressor uses electromagnetic bearings and a variable-speed turbine for significant increase of energy efficiency at partial load compared to the previous solution with conventional centrifugal compressor. Water chillers with water cooled condenser offer high energy efficiency level - EER at the highest external temperatures, because the water chillers operate with condensing temperature up to 40ºC. Part load energy efficiency is outstanding, with energy savings greater than 35% compared to the conventional oil-lubricated centrifugal or screw compressors. Totally oil-free operation has improved the heat transfer efficiency. Extended equipment life was provided with minimal scheduled maintenance. The current project indicates a simple payback for the third water chiller of approximately 2.5 years. The Multiple Chiller System allows unusual redundancy safeguards with energy savings greater than 35%. Belgrade, May 10, 2011 Slobodan Pejković 34 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors
    • Roundtable on climate & ozone-friendly technologies in refrigeration & air-conditioning Thank You For Your Attention Question? Belgrade, May 10, 2011 Slobodan Pejković 35 Multiple Chiller System with Oil-Free Variable-Speed Turbo Compressors