Specifications

Cooling Requirements
Question: How much cooling do I need for my power supply?
Answer: Users frequently rack power supplies into an enclosure to supply power to some remotely located external
load. Under these conditions, to properly determine the cooling requirements, the systems integrator needs thermal
data from the manufacturer for the specific enclosure in question. This data is generally in the form of a curve which
relates the rise of the enclosure's internal air temperature to the amount of power (or BTU'S) dissipated within the
enclosure.
The difference between the maximum power demanded by the external load, and the ac power demanded by the
power supply to support the load's needs, is the power dumped into the internal air of the enclosure. Using this
number and data for the enclosure, the internal rise can be determined. The internal rise added to the external
ambient temperature will determine the temperature of the environment for the power supply. This must be within
the ratings of the product or premature failure will occur.
A valuable conversion factor between Watts and BTU's is listed below:
1 BTU/Hr = 0.293 Watt