To determine the correct model for your application, it is first
necessary to determine the total heat load to which the control panel is
subjected. This total heat load is the combination of two factors —
heat dissipated within the enclosure and heat transfer from outside into
the enclosure.
To Calculate Btu/hr.:
1. First, determine the approximate Watts of heat generated within the enclosure. Watts x 3.41 = Btu/hr.
2. Then, calculate outside heat transfer as follows:
a. Determine the area in square feet exposed to the air, ignoring the top of the cabinet.
b. Determine the temperature differential between maximum surrounding
temperature and desired internal temperature. Then, using the
Temperature Conversion Table (below), determine the Btu/hr./ft.2 for
that differential. Multiplying the cabinet surface area times
Btu/hr./ft.2 provides external heat transfer in Btu/hr.