More Related Content
What's hot
What's hot (14)
Viewers also liked
Viewers also liked (20)
Similar to Ashrae 90.1 and the future of pumping part 2
Similar to Ashrae 90.1 and the future of pumping part 2 (20)
Recently uploaded
Recently uploaded (20)
Ashrae 90.1 and the future of pumping part 2
- 1. Further Design Envelope pumping value vs. end suction pump • First cost savings • Pipe savings • Floor Space savings • Maintenance Savings • Savings on reselection VS. Brazil Visit 2012
- 2. End suction pump installation • Coupling re-alignment • Grouting • Inertia pad • Concrete base • Flex connectors Brazil Visit 2012
- 3. Design Envelope – values & benefits First cost savings 3 pump system 3 pump system VIL Horizontal Split Case 0611-030.0 150x120x300 Savings Installation $19,572 $8,327 cost $11,245 (=57%) Floor space 105.7 sq. ft 44.2 sq. ft $9,225 ($150 / sq. ft) Brazil Visit 2012
- 4. Design Envelope – values & benefits Floor space savings Brazil Visit 2012
- 5. Design Envelope – values & benefits Pipe savings (Glendale Arena, Phoenix) Less pipe = less friction loss resulting in operating cost savings: $6,600 (est. from TDH reduction) Savings Piping $225,975 $128,960 cost $97,015 (= 43%) Length 2751 ft 1723 ft of pipe (2751/100=27.51x (1723/100=17.23x 1028 ft 3’tdh=82.53’tdh) 3’tdh=51.69’tdh) Brazil Visit 2012
- 6. Design Envelope – values & benefits Maintenance savings (Edmonton Airport) $8200 annual savings due to faster mechanical seal changes Brazil Visit 2012
- 7. Design Envelope IVS – Why You Should Use It • Energy savings • First cost savings • Motor / control / sizing More than 20% • Pipe savings first cost savings • Floor space savings • Maintenance savings More than 30% • Wiring savings life cycle cost savings • Harmonic control savings • Sensorless savings on a 6” Design Envelope IVS pump compared to end-suction with VFD • Commissioning savings on wall (doesn’t include pipe savings) • Flow/energy metering • Savings on re-selections Brazil Visit 2012
- 8. Legislative Compliance • Design Envelope IVS (DIN / IEC configuration) pumps conform to 2013 AND 2015 requirements in Europe (MEI 0.4) • Motor control combination is 2017 legislation compliant • Constant speed circulators are generally illegal in Europe ( 20 to 2500) beginning January 2013 • DOE in USA has indicated it’s intension to legislate pump efficiency • My prediction is constant speed pumping will be illegal in the future Brazil Visit 2012
- 9. Design Envelope IVS Pumping Suite 4300 4302 4380 4382 Indoors Integrated to 350hp to 100hp to 7.5hp to 7.5hp Standalone 400-1250hp Outdoors Integrated to 125hp to 100hp to 7.5hp to 7.5hp Brazil Visit 2012
- 10. Introduction DualArm / Twin Pump = 2 rotating assemblies in 1 casing Brazil Visit 2012
- 11. Differences from dualARM Casings Twin DualARM No handles – flapper on discharge Valve handles & locking mechanism only on both suction and discharge Brazil Visit 2012
- 12. Differences dualARM / Twin Functionality Hydraulics Duty- Parallel Oversized Isolation Servicing standby operation ports valve operation ● up to 1,300 gpm ● up to 120 ft Blank Twin ● up to 40 hp plate required ● up to 1,500 gpm ● up to 400 ft dualARM ● up to 100 hp Valve isolation Brazil Visit 2012
- 13. Differences from dualARM Servicing Twin DualARM Blanking plate Valve isolation Use handles to lock Brazil Visit 2012
- 14. Twin or dualARM – Which one to use? Feature Twin DualARM Redundancy Parallel operation Critical service no down-time High pressure Brazil Visit 2012
- 15. Key values & benefits •Redundancy •Compact •Installation savings Brazil Visit 2012
- 16. Key values & benefits Redundancy • HVAC pump systems are typically designed as N+1 (where N = number of pumps) • The “+1” is to ensure redundancy • These systems operate in duty- standby mode only Brazil Visit 2012
- 17. Key values & benefits Compact • One of the smallest footprints in the industry compared to other pump configurations • In some units, flange-to-flange is less than a single VIL Brazil Visit 2012
- 18. Twin pump – values & benefits Floor space savings dualARM Twin End suctions VILs Brazil Visit 2012
- 19. Twin pump – values & benefits Floor space savings Ratio to end suction Model Footprint (sq-ft) pump 4030 3x2.5x8 2 End suctions w/ 5hp motor 25.0 1.00 2 VILs 4300 0308-005.0 10.9 0.44 dualARM 4302 0408-005.0 8.7 0.35 Twin 4312 0308-005.0 6.4 0.26 Brazil Visit 2012
- 20. Twin pump – values & benefits Installation savings 2 pump system 1 Design Envelope IVS End Suction units Twin pumping unit 3x2.5x8 4312 0308-005.0 No coupling re- alignment No grouting No inertia base No concrete pad No flex connectors Savings Installation $5,136 $2,010 cost $3,126 (= 61%) Floor space 25.0 sq. ft 6.4 sq. ft $2,790 ($150 / sq. ft) Brazil Visit 2012
- 21. Differences from dualARM Price Footprint Twin 1.10 0.60 dualARM 1.50 0.80 2 VILs 1.00 1.00 Brazil Visit 2012
- 22. Sensorless Agenda • Traditional control with sensors • Sensorless control • Introduction • Factory loading of program map • Benefits of Sensorless control over sensors • Sensorless in action (video) • Case study – Canada Square Building Retrofit Brazil Visit 2012
- 23. Design Envelope – Sensorless Control Brazil Visit 2012
- 24. Traditional Control with Differential Pressure Sensor Pump, VFD, and sensor to control HVAC systems Brazil Visit 2012
- 25. Traditional Control with Differential Pressure Sensor Possible sensor locations 1)Mechanical room 2)Remote load 3)Other Brazil Visit 2012
- 26. Sensor Location – In Mechanical Room (Variable Flow Secondary) Local Differential Pressure sensor (In Mech Room) Brazil Visit 2012
- 27. Sensor Location – In Mechanical Room Supply Return Sensor Brazil Visit 2012
- 28. Sensor Location – In Mechanical Room Cooling coils (Typical) Head Design Speed B 50% Load Speed A Operating Curve with DP sensor Min. Head Pumps System A Design Point B Minimum Head 50% Load Flow Design Flow Minimum Head equates to sensor setting across the pump in traditional system Brazil Visit 2012
- 29. Sensor Location – Remote Load Remote Differential Pressure sensor (Most remote load) Brazil Visit 2012
- 30. Sensor location – Remote load Cooling coils (Typical) with DP sensor Head Design Speed A 50% Load Speed urve ve l C ur C tro nting Pumps B Coa er Op Min. Head System A Design Point B Minimum Head 50% Load Flow Design Flow Minimum Head equates to sensor setting at remote cooling coil in traditional system Brazil Visit 2012
- 31. Design Envelope – Values & Benefits Operating Cost Savings Power Energy Savings Constant speed A 32.03 Incremental Cumulative throttled Reduced speed B unthrottled – 27.11 15% 15% constant flow Reduced C constant speed – 19.36 29% 40% variable flow Variable speed – D variable flow – 14.35 26% 55% Mech. Room Sensor Design Envelope E 7.32 49% 77% sensorless Brazil Visit 2012
- 32. Design Envelope IVS Operating Cost Savings Total Cost = Operating Cost (3 yrs) + First Cost Design Envelope Savings: More than 60% vs. throttled More than 35% Envelope Design vs. mech. room sensor Brazil Visit 2012
- 33. Sensorless Control Sensorless control Featured on Armstrong Design Envelope pumps Brazil Visit 2012
- 34. Sensorless Control Mimics the performance of a sensor by pre-programming pump curve characteristics into the IVS controls Brazil Visit 2012
- 35. Sensorless Control Works based on 4 parameters •Power •Speed •Head •Flow Brazil Visit 2012
- 36. Sensorless Program Mapping •Power, speed, flow and head are recorded from pump test. •All Sensorless data from every pump is recorded and kept on file in database Brazil Visit 2012
- 37. Sensorless Program Mapping Series 4300 Design Envelope 0611-030.0 6x6x11.5 @ 11.44 in 160 1848 rpm 57 140 68 77 82 84 120 85 1621 rpm 84 82 100 77 Head (ft) 68 80 60 30 hp 40 Control curve 20 528 rpm 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 Flow (1,000 usgpm) Brazil Visit 2012
- 38. Sensorless Program Mapping Design Envelope Series 4300 0611-030.0 Design point = 1000 gpm at 80 ft Flow Head Power Frequency (gpm) (ft) (bhp) (Hz) 1000 80.0 25.2 55.3 900 70.9 19.8 51.2 800 62.7 15.2 47.3 Brazil Visit 2012
- 39. Sensorless Control – Detailed How do we get from 1 to 2? Head Original System Curve 1 1 Satisfied Flow & Head Operating 2 Point (S1 System Curve) Control Curve S1 Operating Speed pump curve S1 S2 System Curve P1 Power at current flow & head S1 System Curve S2 2 Satisfied Flow & Head Operating Power Point (S2 System Curve) S2 Operating Speed pump curve P1 P2 Flow P2 Power at current flow & head Traditional Control Sensorless Operating point is wherever pump performance where pump performance, curve intersects system resistance curve system resistance and control curves converge Brazil Visit 2012
- 40. Sensorless control – detailed Sensorless data Flow Head Power Freq. (gpm) (ft) (bhp) (Hz) Original System Curve 1000 80.0 25.2 55.3 900 70.9 19.8 51.2 Constant speed 1 900 88.0 23.8 55.3 S2 System Curve How we get from 1 to 2 Speed is stable at 1 until system 2 control valves (CV) modulate. S1 urve S1 System Curve trol C System has CV modulating Con closed resulting in a steeper S2 system curve Reverses as CVs open S2 Brazil Visit 2012
- 41. Adjusting Sensorless On Site 3 parameters to adjust Sensorless control curve on site Head Flow Brazil Visit 2012
- 42. Sensorless on site Payback on pump starts as soon as it is installed; no need to wait months for controls contractor 4300 0611-030.0 Cost of pump = $9,702 USD Assume $0.10/kWh Variable flow-constant sp. op = $10,312/yr Variable flow-variable sp. op = $6,145/yr Savings = $4,167/yr 3 month savings = $1,389 Or 14% of the pump cost! Brazil Visit 2012
- 43. Sensorless for parallel pumping Currently only available for single pump operation systems Sensorless for parallel pumping systems… Coming soon Brazil Visit 2012
- 44. Case Study: Canada Square Building Retrofit Background •Constructed in 1972 •18 floor office tower •37,000 m2 of commercial office space. •Armstrong supplied the VIL pumps for initial construction Brazil Visit 2012
- 46. Case Study: Canada Square Building Retrofit Execution • Original pumps 4300 6G 1700 gpm at 140 ft, 75 hp • Design Envelope 4300 IVS 1700 gpm at 136 ft, 75 hp • Design Envelope IVS allowed designer to match pump performance to actual system conditions. Actual system HDesign = 85 ft (53Hz) • Design Envelope IVS pump provided 50% energy savings • Cost savings of $38,000 per year Brazil Visit 2012
- 47. Summary of Sensorless Benefits • Energy savings of 49% over mechanical room sensor • Reduces installation time & cost • No wiring • No conduit • Savings of $2000 Intelligence for your • Eliminates potential problems with sensors Calibration pumping system • Sensor failure • • Forgetting where it is located • Easy on-site balancing and immediate energy savings • Readjust the setpoint from the IVS • No wait for controls commissioning • Ideal for retrofit projects • Can send Sensorless data to the BMS Brazil Visit 2012
- 48. Design Envelope IVS Pumping Around the World King’s Yard Energy Centre / Olympic Park London, UK Brazil Visit 2012
- 49. ASHRAE 90.1 and Armstrong Solutions ASHRAE 90.1 Armstrong Solution Proportional Balancing • Design Envelope Pumps with • Easy adjustment of design head • Armstrong balancing valves • Flo-Trex Valves • Throttling IF and WHEN needed (saves expensive retrofit) Need to achieve 70% less power at • Design Envelope Pumps with 50% flow in CW pumping Systems • Correct lowest operating cost selections • Easy control • Sensorless • Armstrong controls • BMS • Sensored Larger Pipe Avoided With Design Envelope Pumps All Pumps over 1 HP (3/4 kw) should have integrated controls! Brazil Visit 2012
- 50. Design Envelope Pressure Boosters • Lowest Energy • VMS more efficiency than single stage • Utilizes suction design over design for energy savings • Pressure set back • Lowest life cost • Flush valves lasted longer due to lower constant pressures • Slower speed and pressure swings improves equipment life, reduced maintenance and noise from slower speeds, no pressure swings / PRV’s • Security -Safe fill mode • No bypass maintenance -Design Envelope Booster has electronic control Brazil Visit 2012
- 51. Design Envelope IVS Pumping •ASHRAE 90.1 Conformance • PLUS •Lowest Installed Cost •Lowest Life Cycle Cost Brazil Visit 2012
- 52. Summary • Design Envelope thinking • All pumping should have integrated controls. (constant speed pumping is obsolete and soon to be illegal) • HVAC and Pressure booster pumps • Design Envelope pumps are selected to right of pump best efficiency point in a simplified / risk free method • Use Vertical Inline pumps, suction guides and Flotrex valves • Twin and DualArm provide even lower cost and space • If conventional controls valves used – Use manual balancing valves • Lowest first cost • Lowest energy and life cost Brazil Visit 2012
Editor's Notes
- A long list of savings that adds up to a LCC and a true value based offering.
- In a 3 pump system shown here (NOTE: We don’t show the VFDs on the wall or integrated on the motor) But we eliminate the flex connectors, the concrete bases, inertia pads, no realignment of the flex coupling during commissioning. HSC versus VIL Assume 3 pump system - 6x5x12 versus 6x6x11.5 (2-duty / 1-standby) Installation cost = $19,572 vs $8,327 105.7 sf vs 44.2 sf; diff. = 61.5 sf and if we assume $150 / sf, that’s $9,225
- LEFT: BAYFRONT TOWERS, Tampa, FL Compact mechanical room with no space for two individual pumps and no space to mount drives on the wall. Simple single large AHU avoided using DP sensor by using sensorless design. Pumps also have auto alternating feature. Worked out of the box with only a slight adjustment to the minimum maintained pressure to accommodate the twin chillers minimum flow requirement. What is not shown in this picture is the two chillers and twin buffer capacity tanks and expansion control tank. There’s a lot of equipment in this little room! 4302 8x8x10-20 hp DualArm DE-IVS Sensorless unit we sold this past year. The DualArm IVS Sensorless pump has been in operation for almost ¾’s of a year. We took out an old water source Air Handler replacing it with a chilled water AHU, Twin Chillers, the IVS dual Arm, a buffer capacity tank, air purger and expansion tank all in the same room we took the old AHU out of…No small task. It worked right out of the box with only a slight adjustment to the minimum maintained pressure. The original set point was below the chillers minimum flow requirement. Otherwise – Flawless! RIGHT: SHOREWOOD PACKAGING, Danville, VA If no floor space, mount the pumps off the ground!! Commercial real estate cost $120/ sq ft, +50% Joe’s numbers on wall mounting?
- The VILs present a huge opportunity for pipe savings as they can be mounted directly to the chillers, boilers, and cooling towers. On average the pipe savings are reduced by 40-50%. Here’s an example of a plant room optimization for Glendale Arena, home of the Phoenix Coyotes. On the left are HSC. On the right the VILs are mounted directly onto the chillers saving 43% of piping. In this case, the pipe savings pretty well paid for the pumps. Ran AOL 2400 gpm @ 50 ft vs 2400 gpm @ 80 ft and looked at difference in op cost. 14477 vs 7893 = $6600.
- The most common replaced item on pumps is the mechanical seal. Seal changeout is much faster 30mins versus 2 hrs compared to base-mount. Also 4300 VILs don’t use bearings which dramatically reduces failures and maintenance costs.
- A long list of savings that adds up to a LCC and a true value based offering.
- Armstrong Vertical inline pumps with Design Envelope IVS integrated controls. Series 4300 pumps are available up to 350 hp with integrated controls. Series 4380 close-coupled pumps are available up to 7.5 hp with integrated controls.
- The twin pump uses 2 rotating assemblies in 1 shared casing. The twin 4312 and 4392 use the same rotating assemblies as the 4300 and 4380 vertical inline pumps.
- Casings differences.
- Servicing of twin pumps is not as convenient as the dualARM; both pump rotating assemblies must be shutdown in order to begin maintenance of either seal. Since the twin pumps do not feature built-in isolation valves, the pumping unit must be isolated by separate external valving. While the 4312 split-coupled pump features an outside seal, and can be changed without removing the motor, the Series 4392 close-coupled twin pump requires installing a blank plate over one side of the pump casing before the rotating assembly can be accessed and the seal changed.
- Twin pumps provide redundancy but require the system to be temporarily shut down (and the blank plate installed) to service a pump head. The dualARM, with its locking valves, can direct the fluid to the opposite pump head and continue to operate without shut down. For critical services that cannot afford down time, such as cooling for data centers and hospitals the dualARM should be used. The twin pump is available only in bronze-fitted construction rated for ANSI 125. The dualARM can be used in higher pressure services with ductile iron bronze-fitted construction for ANSI 250.
- In some cases the flange to flange dimension is smaller than a single VIL!
- A twin pump installation occupies almost four times less space than an installation with two end-suction base-mounted pumps. Compared to its dualARM counterpart, the twin pump’s installed footprint can use 20-30% less space.
- We ’ ll look at traditional flow control with DP sensor – some of the strategies to get optimum energy savings at part-load. What are some of the pros/cons. Then we ’ ll go into an introduction to sensorless control that is a key feature of our Design Envelope pumps, how we do it, as well as why it presents advantages over sensors. After that, we ’ ll run a short clip of the sensorless display unit in action followed by a case study and then some questions.
- If equipped with the IVS Sensorless feature, the pump’s performance curves against power and speed are pre-programmed into the controls. During operation, the power and speed of the pump are monitored, enabling the controller to establish the hydraulic performance and position the pump’s head-flow characteristic to the system requirements. As the building’s control valves open or close to manage load, the IVS Sensorless controls can intelligently slow down or speed up the pump to maintain the pressure setpoint. The built-in PID controller converts the pressure setpoint to head. Head squared is proportional to flow, flow is proportional to speed.
- With variable frequency drives coming down in price and improved reliability over the years, the building industry has changed over to using variable speed pumps with 2 way valves. Instead of bypassing the excess flow, today we would slow the pump down to reduce capacity to the coil. The mechanism to control the speed of the pump has traditionally been a sensor. The sensor would typically measure differential pressure or temperature of the system and have the variable speed controls respond by speeding up or slow down to control the pump.
- In this simplified chilled water system example, our chiller and pump are found in the basement mechanical room and the pump distributes chilled water to the cooling coils. The building ’ s temperature controls are connected to control valves that manage the flow rate to the cooling coils (load). Traditionally, a differential pressure sensor would be installed across the line to measure the changes in pressure from the valves opening and closing. As the control valves open for more cooling, the system resistance is reduced and the differential pressure across the valve decreases. The variable speed controls react to this change by increasing the pump speed to maintain the pressure setpoint (or the desired pressure). If the control valves close to reduce the cooling output, the differential pressure across the valve increases, and the variable speed controls reduce the pump speed to maintain the pressure setpoint (or the desired pressure). “ desired pressure (the Setpoint) with the actual pressure (the Feedback) from a pressure sensor and adjusts the pump speed to maintain the pressure at the desired level. ” But there are a number of scenarios that come up when dealing with sensors; most notably is where to install the DP sensor. The common thinking suggests that the sensor be installed at the most remote load. Another is to keep things simple and install it in the mechanical room. Another is to install it at 2/3rds from the pump. There are benefits and disadvantages to each of these strategies in terms of energy consumption and installed cost and we ’ ll look at each of them in the next few slides.
- In a chilled water system, a building ’ s temperature controls are connected to control valves that manage the amount of flow rate to the cooling coils. As the control valves open for more cooling, the differential pressure across the cooling coil, valve and piping will begin to decrease, and the IVS controls react to this change by speeding up the pump to maintain the pressure setpoint. If the control valve closes for less cooling, the differential pressure across the coil will increase, and the IVS controls slow down the pump to maintain the pressure setpoint. To ensure the coil is satisfied, a Minimum Head is introduced so that the pressure drop across this load is always satisfied. Our new pump performance curve is now the Control Curve (in blue). The Minimum Head is usually established in the field during the commissioning process by installing differential pressure sensors across the remote load and setting the minimum required head/pressure and wiring it back to the variable speed controls. In this case, the Minimum Head is the same as the design head which doesn ’t result in much energy savings; in fact this configuration won’t even meet the ASHRAE 90.1 energy standard – but it is very simple to install. The built-in PID controller converts the pressure setpoint to head Head squared is proportional to flow, and flow is proportional to speed
- In a chilled water system, a building ’ s temperature controls are connected to control valves that manage the amount of flow rate to the cooling coils. As the control valves open for more cooling, the differential pressure across the cooling coil, valve and piping will begin to decrease, and the IVS controls react to this change by speeding up the pump to maintain the pressure setpoint. If the control valve closes for less cooling, the differential pressure across the coil will increase, and the IVS controls slow down the pump to maintain the pressure setpoint. To ensure the coil is satisfied, a Minimum Head is introduced so that the pressure drop across this load is always satisfied. Our new pump performance curve is now the Control Curve (in blue). The Minimum Head is usually established in the field during the commissioning process by installing differential pressure sensors across the remote load and setting the minimum required head/pressure and wiring it back to the variable speed controls. This configuration provides tremendous energy savings, meeting ASHRAE 90.1 standard for energy efficient operation – but it is difficult to install. The built-in PID controller converts the pressure setpoint to head Head squared is proportional to flow, and flow is proportional to speed There ’ s a lot to think about just on where to place the sensor to get maximum energy savings and to ensure all the loads are satisfied.
- Comparison of the 2 strategies we just discussed. D = mechanical room sensor E = remote load sensor or Design Envelope Sensorless Why is the Design Envelope Sensorless the same performance as remote load sensor? (A: Because the Sensorless control can provide the same performance as a remote load sensor)
- Armstrong innovated the Sensorless pump control technology which has been used in Europe for 15 years specifically for the HVAC industry. The Sensorless function acts as a “virtual sensor” and allows us to control the pump in the same way as sensor - only without the sensor.
- With these 4 parameters, any point on the curve can be determined. Similar to a sizing selection program, if you input flow and head, you get as an output – power and speed. The sensorless control looks at its flow and head to calculate head and speed.
- For simplicity, let ’ s look at 3 sample points and apply them in a pumping system to understand the details of how sensorless control works.
- The slide is illustrating a system friction design curve [S1 System curve] A pump performance curve at full design speed (S1) is selected to intersect the system curve at the design flow and head conditions. The corresponding power drawn is shown below the performance curves. The control curve is set via the VFD graphical interface device by the input of the design flow, head and minimum system pressure (On the vertical [y] axis). As the building conditioned spaces reach the high tolerances levels for the set point conditions, the system 2-way control valves will modulate closed, increasing the resistance to flow and creating a new system resistance curve (Similar to the S2 System curve). This will cause the pump to move left on the S1 performance curve (1), and will pump less water because of the valves throttling to a higher pressure. The power at the new operating point will take less power (2) than the original operating conditions and the Sensorless Control logic recognizes that this power reading is incorrect for the current operating speed and thus reduces the motor speed (Pump curve S2) until the power and speed converge on the control curve (3 & 4). The unit will operate at the new operating point (3) at the reduced power (4) until the control valves react again to conditioned space environment change and modulate appropriately. Thus the IVS Sensorless Controlled pumping package will react in an identical manner to a pump controlled by feedback from a remotely mounted system DP sensor, without the need to purchase, install and wire the remote sensor.
- The slide is illustrating a system friction design curve [S1 System curve] A pump performance curve at full design speed (S1) is selected to intersect the system curve at the design flow and head conditions. The corresponding power drawn is shown below the performance curves. The control curve is set via the VFD graphical interface device by the input of the design flow, head and minimum system pressure (On the vertical [y] axis). As the building conditioned spaces reach the high tolerances levels for the set point conditions, the system 2-way control valves will modulate closed, increasing the resistance to flow and creating a new system resistance curve (Similar to the S2 System curve). This will cause the pump to move left on the S1 performance curve (1), and will pump less water because of the valves throttling to a higher pressure. The power at the new operating point will take less power (2) than the original operating conditions and the Sensorless Control logic recognizes that this power reading is incorrect for the current operating speed and thus reduces the motor speed (Pump curve S2) until the power and speed converge on the control curve (3 & 4). The unit will operate at the new operating point (3) at the reduced power (4) until the control valves react again to conditioned space environment change and modulate appropriately. Thus the IVS Sensorless Controlled pumping package will react in an identical manner to a pump controlled by feedback from a remotely mounted system DP sensor, without the need to purchase, install and wire the remote sensor.
- Generally if a system is overdesigned, the design point ends up drifting to the right of the curve. The head is lower than anticipated and the system needs to be balanced with a circuit balancing valve. Instead of introducing a restriction or a pressure drop in the form of a balancing valve, the Sensorless control curve can be adjusted through the keypad controls. There are 3 parameters built into the Design Envelope controls that define the control curve. Those are the setpoint (desired pressure) P20-21, the minimum head P22-87, and design flow P22-89. (Note that the Design Envelope pump would still work when the design point is over-estimated, however it doesn ’ t begin to reduce its speed until the system is operating below the pre-programmed design flow.)
- *(Comparison of variable flow-constant speed operation to variable flow-variable speed operation) During a building ’ s commissioning, the pumps and 2-way control valves are installed. The control valves open and close as they would under normal operation but the controls contractor has not commissioned the sensors yet; this typically takes 3-4 months. The Design Envelope sensorless pump can react to the changes in system resistance from the valves opening and closing and adjust its speed to meet demand – as soon as it is installed. The savings during those first 3 months can payoff up to 14% of the pump cost.
- Armstrong ’ s Sensorless control is currently only available for singe pump operation systems. It can be used for duty-standby operation but cannot do parallel pumping control. There are some complex control calculations required to stage multiple pumps off and on along a dynamic pump curve. However this feature is currently in development and should be available by the end of the year.
- 2180 Yonge Street is a complex of three interconnected office buildings located in downtown Toronto. The complex includes a small shopping concourse, an office tower and a multiplex cinema. Constructed in 1972, the office tower offers 18 floors and a total of 402,277 square feet (37,373 m 2 ) of commercial office space. Armstrong supplied the pumps for the initial construction of this tower. At the time, Vertical In-Line Pumps were a relatively new, market-leading design.
- Analysis of the original pumps showed they were oversized. Design Envelope IVS solution allowed the system designer to better match the performance of the pumps to the actual system conditions. Actual system Hdesign = 85 ft (53hz)
- Today we ’ll be discussing….