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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
