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Commercial Refrigeration

Cooling and Freezing

Load Calculations and Reference Guide

H-ENGM0408, April 2008

(Replaces H-ENGM0806, August 2006

)

Engineering Manual

Head Pressure

Control Valve

Oil

Separator

Compressor

Suction

Accumulator

Suction

Filter

Evaporator

Condenser

Liquid Line

Solenoid Valve

Liquid Line

Sight Glass

Receiver

Heat

Exchanger

Filter-

Drier

Expansion

Valve

Содержание H-ENGM0408

Страница 1: ...ENGM0408 April 2008 Replaces H ENGM0806 August 2006 Engineering Manual Head Pressure Control Valve Oil Separator Compressor Suction Accumulator Suction Filter Evaporator Condenser Liquid Line Solenoi...

Страница 2: ...e it the number one choice of convenience store owners everywhere Right source Right parts Right now We are your link to a complete line of dependable and certified commercial refrigeration parts acce...

Страница 3: ...s of various liquids and solids 18 16 Banana room refrigeration requirement 19 17 Meat cutting or preparation room 19 18 Rapid load selection for back bars 19 19 Refrigeration requirements for hardeni...

Страница 4: ...arated into the following main sources of heat for a given 24 hour period 1 Transmission load 2 Air change load 3 Miscellaneous load 4 Product load Accuracy Accuracy in calculation is the first step i...

Страница 5: ...y operated lift trucks are used in refrigerated rooms which represent a heat gain of 8 000 to 15 000 BTU hr or more over the period of operation If motor or loading conditions are not known then calcu...

Страница 6: ...simplify the calculation and tabulation of refrigeration loads there are two forms available Bulletin Above32 05 is used for all rooms above 32 F 0 C Bulletin Below32 05 is used for all rooms below 32...

Страница 7: ...x BTU lbs 24 hrs Table 8 For consideration of previously loaded product a multiplier of 5 is normally applied to the daily product load Line 4 Divide by No of Operating Hrs 16 to obtain BTUH Cooling R...

Страница 8: ...lbs 24 hrs Table 8 b lbs stored x BTU lbs 24 hrs Table 8 For consideration of previously loaded product a multiplier of 5 is normally applied to the daily product load Line 4 Divide by No of Operating...

Страница 9: ...e 7 x F Temp Drop For product pulldown time other than 24 hrs figure 24 hr load x 24 Pulldown Time 5 Product Load Respiration a lbs stored x BTU lbs 24 hrs Table 8 b lbs stored x BTU lbs 24 hrs Table...

Страница 10: ...al Temp Drop b gallons of ice cream day x BTU gal Table 19 For product pulldown time other than 24 hrs figure 24 hr load x 24 Pulldown Time Divide by No of Operating Hrs 18 to obtain BTUH Cooling Requ...

Страница 11: ...ice cream day x BTU gal Table 19 For product pulldown time other than 24 hrs figure 24 hr load x 24 Pulldown Time Divide by No of Operating Hrs 18 to obtain BTUH Cooling Requirement Equipment Selecti...

Страница 12: ...Table 7 Product Load Figured 24 hr Pulldown a lbs day x Spec Heat above freezing x F Intial Temp Drop lbs day x Latent Heat Fusion lbs day x Spec Heat below freezing x F Intial Temp Drop b gallons of...

Страница 13: ...0 6 Concrete Floor 4 8 5 200 225 250 275 300 325 350 375 400 425 450 475 500 525 550 575 600 Insulation Inches Heat Load BTU Per 24 Hours Per One Square Foot of Outside Surface Cork Glass Urethane or...

Страница 14: ...1 7 0 36 0 41 1 86 2 09 2 17 2 43 2 49 2 79 2 85 3 24 30 1 1 0 24 0 29 0 58 0 66 2 00 2 24 2 26 2 53 2 64 2 94 2 95 3 35 25 3 9 0 41 0 45 0 75 0 83 2 09 2 42 2 44 2 71 2 79 3 16 3 14 3 54 20 6 7 0 56...

Страница 15: ...months 8 0 0 50 0 31 53 40 Processed Cheese 40 65 70 12 months 19 0 0 50 0 31 56 40 Butter 40 75 85 1 months 4 to 31 0 50 0 25 23 Cream 35 40 2 3 weeks 31 0 0 66 0 80 0 36 0 42 79 107 Ice Cream 20 to...

Страница 16: ...32 90 2 4 weeks 30 3 0 90 0 46 124 33 Pears 29 31 90 95 2 7 months 29 2 0 86 0 45 118 47 Peas Green 32 95 1 3 weeks 30 9 0 79 0 42 106 23 Peppers Sweet 45 50 90 95 2 3 weeks 30 7 0 94 0 47 132 41 Pep...

Страница 17: ...0 5 85 11 55 11 00 25 75 Beans Green or Snap 4 60 5 70 16 05 22 05 Beans Lima 1 15 1 60 2 15 3 05 11 00 13 70 Beets Topped 1 35 2 05 3 60 Broccoli 3 75 5 50 8 80 16 90 25 00 Brussels Sprouts 1 65 4 15...

Страница 18: ...s 150 0 76 104 35 Sheep 45 0 76 101 33 Hogs 180 0 54 106 35 Table 12 Heat equivalent of Occupancy BTU per HP HR Motor Connected Connected Losses Load Motor Load In Outside Outside HP Refr Space1 Refr...

Страница 19: ...87 600 75 85 700 72 81 800 69 78 900 67 75 1000 65 73 1200 62 69 Room Loads based on continuous operation and includes allowance for average number of personnel processing equipment etc with glass pa...

Страница 20: ...nd temperature design conditions Design Design Ground Dry Bulb Wet Bulb Temp State City F C F C F C Nebraska Omaha 95 35 78 26 60 16 Nevada Reno 95 35 65 18 65 18 New Hamp Concord 90 32 73 23 55 13 Ne...

Страница 21: ...hr to be sure that the unit cooler is large enough to balance properly with the condensing unit Low relative humidity requirements permit higher T D which in turn will allow selection of unit coolers...

Страница 22: ...of air for particular applications Derating Factors A Ambient B Altitude C Saturated Suction Temperature S S T D 50 Cycle Power In the selection of refrigeration equipment it should be noted that the...

Страница 23: ...l 1 5 safety factor sometimes applied to handle initial high rate of product heat evolution Ice Cream Hardening 10 F Heavy Duty 10 hour pull down with product 30 frozen and a certain percentage over r...

Страница 24: ...ere low and normal temperature is being maintained Allow sufficient space between rear of unit cooler and wall to permit free return of air Refer to unit manufacturers catalog for proper space Always...

Страница 25: ...0 1 1 8 1 3 8 1 3 8 1 5 8 1 5 8 1 5 8 1 3 8 1 3 8 1 5 8 1 5 8 2 1 8 2 1 8 1 3 8 1 5 8 1 5 8 1 5 8 2 1 8 2 1 8 72 000 1 1 8 1 3 8 1 5 8 1 5 8 1 5 8 2 1 8 1 3 8 1 3 8 1 5 8 1 5 8 2 1 8 2 1 8 1 3 8 1 5 8...

Страница 26: ...8 2 1 8 2 1 8 2 5 8 5 8 5 8 7 8 7 8 7 8 7 8 72 000 1 5 8 2 1 8 2 1 8 2 1 8 2 5 8 2 5 8 1 5 8 2 1 8 2 1 8 2 1 8 2 5 8 2 5 8 5 8 5 8 7 8 7 8 7 8 7 8 78 000 1 5 8 2 1 8 2 1 8 2 1 8 2 5 8 2 5 8 1 5 8 2 1...

Страница 27: ...1 3 8 1 3 8 1 3 8 1 5 8 1 5 8 1 1 8 1 3 8 1 3 8 1 5 8 1 5 8 1 5 8 1 3 8 1 3 8 1 5 8 78 000 1 1 8 1 1 8 1 3 8 1 3 8 1 3 8 1 5 8 1 1 8 1 3 8 1 3 8 1 3 8 1 5 8 1 5 8 1 1 8 1 3 8 1 5 8 1 5 8 1 5 8 2 1 8...

Страница 28: ...1 2 1 2 5 8 5 8 5 8 5 8 66 000 1 5 8 2 1 8 2 1 8 1 3 8 1 3 8 1 5 8 1 5 8 2 1 8 2 1 8 1 3 8 1 5 8 1 5 8 2 1 8 2 1 8 2 1 8 1 2 1 2 5 8 5 8 5 8 5 8 72 000 1 5 8 2 1 8 2 1 8 1 3 8 1 5 8 1 5 8 1 5 8 2 1 8...

Страница 29: ...1 1 8 1 3 8 1 3 8 1 5 8 1 5 8 1 5 8 1 1 8 1 3 8 1 5 8 1 5 8 1 5 8 1 5 8 1 3 8 1 5 8 1 5 8 1 5 8 1 5 8 1 5 8 1 3 8 1 5 8 1 5 8 78 000 1 1 8 1 3 8 1 3 8 1 5 8 1 5 8 2 1 8 1 3 8 1 3 8 1 5 8 1 5 8 1 5 8 2...

Страница 30: ...5 8 2 1 8 1 2 1 2 5 8 5 8 5 8 5 8 66 000 1 5 8 1 5 8 2 1 8 1 3 8 1 5 8 1 5 8 1 5 8 1 5 8 2 1 8 1 3 8 1 5 8 1 5 8 1 5 8 1 5 8 2 1 8 1 2 5 8 5 8 5 8 5 8 5 8 72 000 1 5 8 2 1 8 2 1 8 1 5 8 1 5 8 1 5 8 1...

Страница 31: ...g Tee Straight Through 1 2 2 3 4 4 5 7 8 10 12 14 16 Table 25 Pressure Loss of Liquid Refrigerants in Liquid Line Risers Expressed in Pressure Drop PSIG and Subcooling Loss F Liquid Line Rise in Feet...

Страница 32: ...3 8 7 8 1 1 8 7 8 1 1 8 1 1 8 100 1 5 8 1 1 8 1 3 8 1 1 8 1 3 8 1 3 8 180 000 50 1 5 8 1 1 8 1 3 8 1 1 8 1 3 8 1 3 8 100 1 5 8 1 3 8 1 5 8 1 3 8 1 5 8 1 5 8 240 000 50 1 5 8 1 3 8 1 3 8 1 3 8 1 5 8 1...

Страница 33: ...1 3 27 26 39 63 86 1 24 134a 64 2 2 57 14 26 40 61 1 91 1 3 8 22 63 5 3 50 27 42 64 93 1 33 R507 404A 55 0 4 98 40 58 95 1 32 1 87 134a 90 9 3 65 20 37 57 87 1 30 1 5 8 22 90 0 4 96 37 59 90 1 33 1 8...

Страница 34: ...6 7 44 111 2 40 0 104 219 2 73 3 164 327 4 26 1 15 5 0 7 2 45 113 0 40 6 105 221 0 73 9 165 329 0 25 6 14 6 8 7 8 46 114 8 41 1 106 222 8 74 4 166 330 8 25 0 13 8 6 8 3 47 116 6 41 7 107 224 6 75 0 16...

Страница 35: ...2 F Density of Water 62 4 lbs Cu Ft Specific Heat of Water 1 BTU lb F Latent Heat of 970 BTU lb at 212 F Atm Vaporization 1054 3 BTU lb at 70 F Specific Heat of Ice 0 5 BTU lb F Latent Heat of Fusion...

Страница 36: ...ubic Foot of Brick Building 112 120 1 Cubic Foot of Concrete 120 140 1 Cubic Foot of Earth 70 120 at 32 F at 70 F and 29 92 Hg To Convert Measurements From To Multiply By Cubic Feet Cubic Centimeters...

Страница 37: ...ng A decrease in dry bulb and sensible heat content represented by a horizontal line directed to the loft along the constant specific humidity line Specific humidity and dew point remain constant 3 Ev...

Страница 38: ...ure of 29 921 in HG Atmospheric Pressure at other altitude Altitude Pressure Ft in HG 1000 31 02 500 30 47 0 29 92 500 29 38 1000 28 86 2000 27 82 3000 26 83 4000 25 84 5000 24 90 6000 23 98 7000 23 0...

Страница 39: ...39 Appendix Charts Medium Temperature Psychrometric Chart 32 to 130 F Standard Atmospheric Pressure of 29 921 in HG Courtesy of ASHRAE Reproduced by permission...

Страница 40: ...antaneous evaporation of refrigerant in a pressure reducing device to cool the refrigerant to the evaporations temperature obtained at the reduces pressure 22 Flooded System system in which only part...

Страница 41: ...x8 216 12775 16359 12072 15459 11807 16080 12767 17464 13726 18847 12x20x8 240 13681 17440 12928 16481 12573 17052 13599 18524 14626 19995 12x22x8 264 14549 18474 13749 17458 13299 17974 14392 19541 1...

Страница 42: ...o loads to allow for service For product pull down greater than 10 degrees divide pull down temperature by 10 Multiply this number by the BTUH shown on Table A then add to Box Load Floor Approx 65 R H...

Страница 43: ...at left of graph Follow it across to the straight line curve Then drop down to total load line at bottom of graph Total load for this example is 224 000 BTUH Select equipment accordingly Material orig...

Страница 44: ...serve the right to make changes in specifications without notice CLIMATE CONTROL Commercial Refrigeration Parts The name behind the brands you trust Heatcraft Refrigeration Products LLC 2175 West Park...

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