Heatcraft Refrigeration Products H-ENGM0408 - Manual (Page 43)

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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