Heatcraft Refrigeration Products Heatcraft Walk-In Cooler and Freezer Load Calculation for Optimal Efficiency

Rapid Load Calculator for Large Coolers and Freezers

Design Conditions: 95ºF. ambient; heavy service; 16-hr. compressor running time; average number of lights, motors, and people; product load figured according to accompanying table; product traffic calculated at 30 degree temperature reduction for coolers, 10 degree temperature reduction for freezers.

Note: This calculator will work equally well for coolers and freezers, providing the room is insulated as indicated below:

35ºF. cooler- 3” polystyrene or equivalent

30ºF. cooler- 4” polystyrene or equivalent

0ºF. cooler- 5” polystyrene or equivalent -10ºF. cooler- 5 1/2” polystyrene or equivalent

-20ºF. cooler- 6” polystyrene or equivalent

Example: 100 x 40 x 20’ zero ºF. freezer. Outside surface totals 13,600 sq. ft. Find 13,600 sq. ft. outside surface line 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 originated by Hugo Smith, consulting editor, Air Conditioning and Refrigeration Business. Reprinted by permission from the April 1968 issue of Air Conditioning and Refrigeration

Business. Copyright by Industrial Publishing Co., Division of Pittway Corporation.

			Average Daily			Average Daily
Volume-			Product Loads (lbs.)			Product Loads (lbs.)
Cu. Ft.			for Coolers			for Freezers
500	-	3,000	6,200	-	8,000	1,600	-	2,000
3,000	-	4,600	8,000	-	11,000	2,000	-	2,500
4,600	-	8,100	11,000	-	17,000	2,500	-	4,000
8,100	-	12,800	17,000	-	26,000	4,000	-	6,200
12,800	-	16,000	26,000	-	33,000	6,200	-	7,500
16,000	-	20,000	33,000	-	40,000	7,500	-	9,500
20,000	-	28,000	40,000	-	56,000	9,500	-	13,000
28,000	-	40,000	56,000	-	66,000	13,000	-	17,000
40,000	-	60,000	66,000	-	110,000	17,000	-	25,000
60,000	-	80,000	110,000	-	150,000	25,000	-	34,000
80,000	-	up	150,000	-	up	34,000	-	up

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