Rapid Load Calculator for Large Coolers and Freezers
Design Conditions: 95ºF. ambient; heavy service;
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
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.
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| 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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