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6. Hourly Heat Load
The hourly heat load serves as the guide in selecting
equipment. It is found by dividing the nal BTU/24 hour load
by the desired condensing unit run time.
35ºF. rooms with no timer 16 hr.
35ºF. rooms with timer 18 hr.
Blast coolers/Freezers with
positive defrost 18 hr.
Storage Freezers 18-20 hr.
25ºF. - 34ºF. coolers with hot gas
or electric defrost 20-22 hr.
50ºF. rooms and higher with coil
temperature above 32ºF. 20-22 hr.
7. Load Calculation Forms
To simplify the calculation and tabulation of refrigeration
loads, there are two forms available:
Bulletin Above32-05 is used for all rooms above 32ºF. (0ºC.)
Bulletin Below32-05 is used for all rooms below 32ºF. (0ºC.)
All data and tables necessary to ll in the Load Calculation
Forms can be found in this manual.
A Word of Caution: The refrigeration load calculation
methods presented in this manual are intended for use
in selecting refrigeration equipment for rooms used for
holding and sometimes pulling product temperature down.
For process or unusual applications such as blast freezing or
food processing situations, please contact our Application
Engineering Department.