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.

• Convert Waste Heat to Hot Water, Up to 195° F (90° C)• Reduce or Eliminate Hot Water Boilers• Retrofit Existing Ammonia Refrigeration Systems• High Coefficient of Performance (COP) at Full or Part Load

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 Pump

Single Stage Scavenging Heat Pump System

Condensing

Desuperheating

Subcooling

Oil Cooling

Ammonia Refrigeration SystemsOil Cooling& Desuperheating

Available Waste Heat

Single Screw Ammonia Heat Pump

High Temperature AmmoniaPressure and Temperature

°F psia psig cuft/lb °C barA

90.0 180.76 166.06 1.6588 32.2 12.4695.0 195.91 181.21 1.5319 35.0 13.51100.0 212.01 197.31 1.4163 37.8 14.62105.0 229.09 214.39 1.3108 40.6 15.80110.0 247.19 232.49 1.2144 43.3 17.04115.0 266.34 251.64 1.1262 46.1 18.36120.0 286.60 271.90 1.0452 48.9 19.76125.0 307.98 293.28 0.9710 51.7 21.23130.0 330.54 315.84 0.9026 54.4 22.79135.0 354.32 339.62 0.8397 57.2 24.43140.0 379.36 364.66 0.7817 60.0 26.16145.0 405.70 391.00 0.7280 62.8 27.97150.0 433.38 418.68 0.6785 65.6 29.88155.0 462.45 447.75 0.6325 68.3 31.88160.0 492.95 478.25 0.5899 71.1 33.99165.0 524.94 510.24 0.5504 73.9 36.19170.0 558.45 543.75 0.5136 76.7 38.50175.0 593.53 578.83 0.4793 79.4 40.92180.0 630.24 615.54 0.4473 82.2 43.45185.0 668.63 653.93 0.4174 85.0 46.10190.0 708.74 694.04 0.3895 87.8 48.87195.0 750.64 735.94 0.3633 90.6 51.75200.0 794.38 779.68 0.3387 93.3 54.77205.0 840.03 825.33 0.3156 96.1 57.92

Single Stage Scavenging Heat Pump System

Ammonia Heat Pump Scavenging System

Condensing

Host Oil Cooling& Desuperheating

SubcoolingScavenger Oil Cooling& Desuperheating

Existing Refrigeration System Single Stage Heat Pump Scavenging System

Single Screw Ammonia Heat Pump

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 system by 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 moderate temperatures, up to 160° F (71° C), single stage single screw heat pump systems provide optimal performance (COP’s) due to the duty’s relatively low differential pressures, up to 350 psid.

Single Stage Ammonia Scavenging Heat Pump Package

Single Screw Ammonia Heat Pump

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 Pump

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

Existing Refrigeration System Two-Stage Heat Pump Scavenging System

Two-Stage Ammonia Scavenging Heat Pump Package

Single Screw Ammonia Heat Pump

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, superior COP’s are realized in achieving very high water temperatures, up to 195° F (90° C). Vilter single screw compressors employed to satisfy the high pressures and temperatures of two-stage ammonia heat pumps operate reliably and efficiently at such intensive duties due to their naturally balanced axial and radial 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 extract heat from air and water is increasingly popular, largely because the heat they deliver far exceeds the energy they consume.

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

The city of Drammen (population 60,000) needed hot water at 90° C (194° F) for their new district heating system. Using ammonia refrigerant (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-based stand-alone heat pump system. When the project comes on line, all of Drammen’s hot water heating needs with be supplied with energy extracted from the frigid North Sea, 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.

©2010 Emerson Electric Co. All rights reserved. Printed in the USAv11 3/2010