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Single Screw Ammonia
Heat Pumps
The World’s Best CompressorsFor Industrial Refrigeration
TM
Harness Your Heat...Don’t Reject It
Vilter Single Screw Ammonia Heat Pumps
Conventional Food and Beverage Processing PlantsUtilize Two Opposing Paths of Energy
Refrigeration Heat Energy OUT
Vilter Single Screw Ammonia Heat Pumps Harness the Heat from Refrigeration and Bridge the Gap for the Beneficial Use of Rejected Heat
High pressure Vilter Heat Pump Compressors allow plants to conserve energy by transferring refrigeration waste heat into useful hot water heating, while reducing or
eliminating hot water boilers and the fossil fuels they consume.
• ConvertWasteHeattoHotWater,Upto195°F(90°C)• ReduceorEliminateHotWaterBoilers• RetrofitExistingAmmoniaRefrigerationSystems• HighCoefficientofPerformance(COP)atFullorPartLoad
Refrigeration systems absorb heat but then reject it back into the atmosphere.
Simultaneously, plant demands for hot water, such as process room clean-up activities, use
fossil fuel energy to heat water.
Fossil Fuel Heat Energy IN
Single Screw Ammonia Heat Pumps
Conventional Heat Recovery from Ammonia Refrigeration Systems
Single Screw Ammonia Heat Pumps
Self-Contained Ammonia Heat Pump System
Oil Cooling& Desuperheating
Available Waste Heat
Ammonia Refrigeration System
Oil Cooling& Desuperheating
Evaporation
Condensing
High Temperature AmmoniaPressure and Temperature
°F psia psig °C barA
90.0 180.76 166.06 32.2 12.4695.0 195.91 181.21 35.0 13.51100.0 212.01 197.31 37.8 14.62105.0 229.09 214.39 40.6 15.80110.0 247.19 232.49 43.3 17.04115.0 266.34 251.64 46.1 18.36120.0 286.60 271.90 48.9 19.76125.0 307.98 293.28 51.7 21.23130.0 330.54 315.84 54.4 22.79135.0 354.32 339.62 57.2 24.43140.0 379.36 364.66 60.0 26.16145.0 405.70 391.00 62.8 27.97150.0 433.38 418.68 65.6 29.88155.0 462.45 447.75 68.3 31.88160.0 492.95 478.25 71.1 33.99165.0 524.94 510.24 73.9 36.19170.0 558.45 543.75 76.7 38.50175.0 593.53 578.83 79.4 40.92180.0 630.24 615.54 82.2 43.45185.0 668.63 653.93 85.0 46.10190.0 708.74 694.04 87.8 48.87195.0 750.64 735.94 90.6 51.75200.0 794.38 779.68 93.3 54.77205.0 840.03 825.33 96.1 57.92
Desuperheating
Oil Cooling
Condensing
Self-Contained Ammonia Refrigeration Heat Pump System
Available Heat
Single Stage Scavenging Heat Pump System
Ammonia Heat Pump Scavenging System
Condensing
Host Oil Cooling& Desuperheating
SubcoolingScavenger Oil Cooling& Desuperheating
ExistingRefrigerationSystem Single Stage Heat Pump Scavenging System
Single Screw Ammonia Heat Pumps
SuctionPressure
SSTDischargePressure
SDTNominal
WaterFlow
Heat Recovered
Total Absorbed
PowerCOP
psig (barg) °F (°C) psig (barg) °F (°C) GPM (m3/hr) mBTUH (kW) HP (kW) unitless
VSS-291 178 (12.1) 94 (34.5) 478 (32.5) 160 (71) 72 (16.4) 4874 (1429) 305 (228) 6.28
VSS-341 178 (12.1) 94 (34.5) 474 (32.2) 159 (70.5) 84 (19.1) 5657 (1658) 354 (264) 6.28
VSS-451 178 (12.1) 94 (34.5) 468 (31.9) 158 (70) 126 (28.6) 8540 (2503) 517 (386) 6.49
VSS-601 178 (12.1) 94 (34.5) 469 (31.9) 158 (70) 149 (33.9) 10041 (2943) 599 (447) 6.59
* Based upon compressors operating at 3550 RPM (60 Hz)
Single Stage Ammonia Heat Pumps Heat Water from 55°F to 155° F
Compressor Model
A scavenging heat pump system is designed to pull heat out of an existing refrigeration systemby diverting ammonia discharge gas away from refrigeration system condensers to the suction inlet of the heat pump system. Vilter single screw compressors are designed to handle the high suction pressures required of this duty, and deliver the very high discharge temperature vapors for water heating in order to make use of the refrigeration system’s waste heat. In heating water to moderatetemperatures,upto160°F(71°C),singlestagesinglescrewheatpumpsystemsprovideoptimalperformance(COP’s)duetotheduty’srelativelylowdifferentialpressures,upto350psid.
Single Stage Ammonia Scavenging Heat Pump Package
Single Screw Ammonia Heat Pumps
Two-Stage Scavenging Heat Pump System
Condensing
Host Oil Cooling& Desuperheating
Subcooling
2nd Stage Oil Cooling& Desuperheating
1st Stage Oil Cooling & Desuperheating
Ammonia Heat Pump Scavenging System
Single Screw Ammonia Heat Pumps
TWO-STAGE HEAT PUMP SCAVENGING SYSTEMEXISTING AMMONIA REFRIGERATION SYSTEM
1ST STAGECOMPRESSOR
OIL COOLEROIL COOLER
EXISTINGCOMPRESSORS
SYSTEMCONDENSOR
MAIN SYSTEM LIQUID
MAIN DISCHARGE GAS
EQUALIZING
MAIN RECEIVER
INLET WATERSUBCOOLER
OUTLET WATER
LOW STAGEDESUPERHEATER
INTERCOOLER
CONDENSER
HIGH STAGEDESUPERHEATER
2ND STAGECOMPRESSOR
LEVEL CONTROLLER
ExistingRefrigerationSystem Two-Stage Heat Pump Scavenging System
Two-Stage Ammonia Scavenging Heat Pump Package
Single Screw Ammonia Heat Pumps
Two-stage scavenging heat pump systems are utilized where the desired water temperatures are higher than those provided by single stage systems. Higher differential water temperatures correlate to higher differential pressures in heat pump compressors. By splitting the heat pump design from a single stage to a two-stage system,superiorCOP’sarerealized inachievingveryhighwatertemperatures,upto195°F (90°C). Viltersingle screw compressors employed to satisfy the high pressures and temperatures of two-stage ammonia heatpumpsoperatereliablyandefficientlyatsuchintensivedutiesduetotheirnaturallybalancedaxialandradial design.
SuctionPressure
SSTDischargePressure
SDT PowerNominal
WaterFlow
Heat Recovered
Total Absorbed
PowerCOP
psig (barg) °F (°C) psig (barg) °F (°C) HP (kW) GPM (m3/hr) mBTUH (kW) HP (kW) unitless
Low VSS-451 178 (12.1) 94 (34.5) 371 (25.2) 141 (60.5) 383 (286)High VSS-291 366 (24.9) 140 (60) 721 (49.0) 193 (89.5) 425 (317)
Low VSS-601 178 (12.1) 94 (34.5) 370 (25.2) 141 (60.5) 445 (332)High VSS-341 365(24.8) 140 (60) 720 (49.0) 193 (89.5) 498 (371)
Low VSS-901 178 (12.1) 94 (34.5) 371 (25.2) 141 (60.5) 766 (571)High VSS-451 366 (24.9) 140 (60) 721 (49.0) 193 (89.5) 768 (573)
Low VSS-1051 178 (12.1) 94 (34.5) 370 (25.2) 141 (60.5) 828 (618)High VSS-601 365 (24.8) 140 (60) 720 (49.0) 193 (89.5) 867 (647)
* Based upon compressors operating at 3550 RPM (60 Hz)
15819 (4636)
18339 (5375)
808 (603)
942 (703)
1534 (1144)
1694 (1264)
Two-Stage Ammonia Heat Pumps Heat Water from 55°F to 190° F
8772 (2571)
10680 (3130)
4.27
4.45
StageCompressor
Model
4.06
4.25
130 (29.5)
158 (35.9)
234 (53.2)
271 (61.6)
The use of heat pumps to extractheatfromairandwateris increasingly popular, largely because the heat they deliver farexceedstheenergytheyconsume.
Vilter engineers, collaborating with Star Refrigeration and Norsk-Kulde, made use of Vilter single screw compressors to produce the pressures and temperatures required for the system.
Emerson.com/StarRefrigeration
Courtesy of Star Refrigeration
IT’S NEVERBEEN DONEBEFORE
Stand-Alone Heat Pump System
ThecityofDrammen(population60,000)neededhotwaterat90°C(194°F)fortheirnewdistrictheatingsystem.Usingammoniarefrigerant(R-717)the project is highly efficient, greatly reduces the use of fossil fuels, and has no negative impact on the ozone layer or global warming.
The city of Drammen, Norway is embarking on a novel energy saving plan using an ammonia-basedstand-aloneheatpumpsystem.Whenthe project comes on line, all of Drammen’s hot water heating needs with be supplied withenergyextractedfromthefrigidNorthSea, greatly reducing the use and emissions of fossil fuels.
Vilter reserves the right to make changes in design and specifications without notice.Emerson and Vilter are trademarks of Emerson Electric Co. or one of its affiliated companies.
©2010EmersonElectricCo.Allrightsreserved.PrintedintheUSAv135/2010