ASHRAE Journal - February 2010 - 14

Heat Recovery In Retail Refrigeration By Richard Royal, P Associate Member ASHRAE .E., M ost retail grocery stores’ refrigeration systems run 24 hours a day, seven days a week, consume one-third to one-half of the total electrical energy for the building and offer a constant supply of low quality heat. The term “quality” of heat is a reference to the comparative temperature available from the source system to the heat recovery application. Low quality heat, for this discussion, represents a comparative temperature difference of less than 100°F (55°C). Most commercial refrigeration systems use a direct expansion (DX) process with an expansion valve in the liquid line, to meter the amount of refrigerant into the evaporator coil, and a pressure regulating valve in the suction line, adjusted to control the temperature of the air off the evaporator coil from each refrigerated case in a store. In a properly operating commercial refrigeration system, the low-temperature system will have an evaporator coil temperature of approximately–20°F (–29°C), an expansion valve coil superheat range setting of 4°F to 6°F (–16°C to –14°C) and a return gas temperature to the compressor suction header around 30°F (–1°C). The medium-temperature system will have an evaporator coil temperature near 20°F (–7°C), an expansion valve coil superheat range setting of 5°F to 8°F (–15°C to About the Author Richard Royal, P is mechanical design manager, .E., prototypical design/construction standards, at WalMart in Bentonville, Ark. R-407A Properties – Low Temperature – Desuperheating1 Superheated Condensing Condensing Compressor Vapor Enthalpy Temp. Pressure Discharge Condenser (°F) (psia) (°F) Inlet (Btu/lbm) Saturated Vapor Condenser (Btu/lbm) Liquid Enthalpy (Btu/lbm) Mass Flow (lbm/h) Load (Btu/h) Heat Recovery Percent of Available Design (Desuperheating) Day Load (Btu/h) 65 75 85 95 105 115 140.9 165.0 192.1 222.3 256.1 293.5 190.0 204.0 219.0 235.0 250.0 267.0 203.2 205.8 208.6 211.8 214.7 218.1 174.3 175.1 175.8 176.4 176.9 177.1 95.8 99.3 103.0 106.7 110.6 114.6 4,602 5,016 5,494 6,032 6,666 7,412 320,875 332,200 343,525 354,850 366,175 377,500 85% 88% 91% 94% 97% 100% 132,800 153,905 180,368 213,326 252,093 303,711 Based on a low temperature system with a 378 MBh refrigeration load at –20°F saturated suction temperature and a medium temperature system with a 889 MBh refrigeration load at +20°F saturated suction temperature. One MBh is equal to 1,000 Btu/h. No natural subcooling or useful superheat included. Table 1: Desuperheating heat recovery for a R-407A system. 14 ASHRAE Journal ashrae.org February 2010

ASHRAE Journal - February 2010

Table of Contents for the Digital Edition of ASHRAE Journal - February 2010

ASHRAE Journal - February 2010
Contents
Commentary
Industry News
Letters
Meetings and Shows
Heat Recovery In Retail Refrigeration
Using CO2 in Supermarkets
Demand-Based Control Of Lab Air Change Rates
Anniversary Feature: Improved Zoning Betters Department Store Air Conditioning
History of Radiant Heating & Cooling Systems, Part 2
Save Chiller Plant Energy With Guideline 22-2008
Building Sciences
ACREX 2010 Show Guide
Washington Report
InfoCenter
People
Technical Topics
Emerging Technologies
Special Products
Products
Classified Advertising
Advertisers Index
ASHRAE Journal - February 2010 - ASHRAE Journal - February 2010
ASHRAE Journal - February 2010 - Cover2
ASHRAE Journal - February 2010 - 1
ASHRAE Journal - February 2010 - 2
ASHRAE Journal - February 2010 - Contents
ASHRAE Journal - February 2010 - 4
ASHRAE Journal - February 2010 - Commentary
ASHRAE Journal - February 2010 - Industry News
ASHRAE Journal - February 2010 - 7
ASHRAE Journal - February 2010 - 8
ASHRAE Journal - February 2010 - 9
ASHRAE Journal - February 2010 - Letters
ASHRAE Journal - February 2010 - 11
ASHRAE Journal - February 2010 - Meetings and Shows
ASHRAE Journal - February 2010 - 13
ASHRAE Journal - February 2010 - Heat Recovery In Retail Refrigeration
ASHRAE Journal - February 2010 - 15
ASHRAE Journal - February 2010 - 16
ASHRAE Journal - February 2010 - 17
ASHRAE Journal - February 2010 - 18
ASHRAE Journal - February 2010 - 19
ASHRAE Journal - February 2010 - 20
ASHRAE Journal - February 2010 - 21
ASHRAE Journal - February 2010 - 22
ASHRAE Journal - February 2010 - 23
ASHRAE Journal - February 2010 - Using CO2 in Supermarkets
ASHRAE Journal - February 2010 - 25
ASHRAE Journal - February 2010 - 26
ASHRAE Journal - February 2010 - 27
ASHRAE Journal - February 2010 - 28
ASHRAE Journal - February 2010 - 29
ASHRAE Journal - February 2010 - Demand-Based Control Of Lab Air Change Rates
ASHRAE Journal - February 2010 - 31
ASHRAE Journal - February 2010 - 32
ASHRAE Journal - February 2010 - Insert1
ASHRAE Journal - February 2010 - Insert2
ASHRAE Journal - February 2010 - 33
ASHRAE Journal - February 2010 - 34
ASHRAE Journal - February 2010 - 35
ASHRAE Journal - February 2010 - 36
ASHRAE Journal - February 2010 - 37
ASHRAE Journal - February 2010 - 38
ASHRAE Journal - February 2010 - 39
ASHRAE Journal - February 2010 - 40
ASHRAE Journal - February 2010 - 41
ASHRAE Journal - February 2010 - Anniversary Feature: Improved Zoning Betters Department Store Air Conditioning
ASHRAE Journal - February 2010 - 43
ASHRAE Journal - February 2010 - 44
ASHRAE Journal - February 2010 - 45
ASHRAE Journal - February 2010 - 46
ASHRAE Journal - February 2010 - 47
ASHRAE Journal - February 2010 - 48
ASHRAE Journal - February 2010 - 49
ASHRAE Journal - February 2010 - History of Radiant Heating & Cooling Systems, Part 2
ASHRAE Journal - February 2010 - 51
ASHRAE Journal - February 2010 - 52
ASHRAE Journal - February 2010 - 53
ASHRAE Journal - February 2010 - 54
ASHRAE Journal - February 2010 - 55
ASHRAE Journal - February 2010 - Save Chiller Plant Energy With Guideline 22-2008
ASHRAE Journal - February 2010 - 57
ASHRAE Journal - February 2010 - 58
ASHRAE Journal - February 2010 - 59
ASHRAE Journal - February 2010 - Building Sciences
ASHRAE Journal - February 2010 - 61
ASHRAE Journal - February 2010 - 62
ASHRAE Journal - February 2010 - 63
ASHRAE Journal - February 2010 - 64
ASHRAE Journal - February 2010 - ACREX 2010 Show Guide
ASHRAE Journal - February 2010 - S2
ASHRAE Journal - February 2010 - S3
ASHRAE Journal - February 2010 - S4
ASHRAE Journal - February 2010 - S5
ASHRAE Journal - February 2010 - S6
ASHRAE Journal - February 2010 - S7
ASHRAE Journal - February 2010 - S8
ASHRAE Journal - February 2010 - S9
ASHRAE Journal - February 2010 - S10
ASHRAE Journal - February 2010 - S11
ASHRAE Journal - February 2010 - S12
ASHRAE Journal - February 2010 - S13
ASHRAE Journal - February 2010 - S14
ASHRAE Journal - February 2010 - S15
ASHRAE Journal - February 2010 - S16
ASHRAE Journal - February 2010 - S17
ASHRAE Journal - February 2010 - S18
ASHRAE Journal - February 2010 - S19
ASHRAE Journal - February 2010 - S20
ASHRAE Journal - February 2010 - S21
ASHRAE Journal - February 2010 - S22
ASHRAE Journal - February 2010 - S23
ASHRAE Journal - February 2010 - S24
ASHRAE Journal - February 2010 - S25
ASHRAE Journal - February 2010 - S26
ASHRAE Journal - February 2010 - S27
ASHRAE Journal - February 2010 - S28
ASHRAE Journal - February 2010 - S29
ASHRAE Journal - February 2010 - S30
ASHRAE Journal - February 2010 - S31
ASHRAE Journal - February 2010 - S32
ASHRAE Journal - February 2010 - Washington Report
ASHRAE Journal - February 2010 - InfoCenter
ASHRAE Journal - February 2010 - 67
ASHRAE Journal - February 2010 - 68
ASHRAE Journal - February 2010 - 69
ASHRAE Journal - February 2010 - 70
ASHRAE Journal - February 2010 - 71
ASHRAE Journal - February 2010 - 72
ASHRAE Journal - February 2010 - People
ASHRAE Journal - February 2010 - Technical Topics
ASHRAE Journal - February 2010 - 75
ASHRAE Journal - February 2010 - 76
ASHRAE Journal - February 2010 - 77
ASHRAE Journal - February 2010 - Emerging Technologies
ASHRAE Journal - February 2010 - 79
ASHRAE Journal - February 2010 - 80
ASHRAE Journal - February 2010 - 81
ASHRAE Journal - February 2010 - 82
ASHRAE Journal - February 2010 - Special Products
ASHRAE Journal - February 2010 - Products
ASHRAE Journal - February 2010 - Classified Advertising
ASHRAE Journal - February 2010 - 86
ASHRAE Journal - February 2010 - 87
ASHRAE Journal - February 2010 - Advertisers Index
ASHRAE Journal - February 2010 - Cover3
ASHRAE Journal - February 2010 - Cover4
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