# Temperature Increase of Sealed Enclosure

I have a sealed metal enclosure of size 20inches x 13 inches x12 inches.

A 500W isolated transformer with about half the load producing constant 51 Celsius will be put inside.

How do you compute for the temperature increase inside the enclosure? Ambient temperature outside is 36 Celsius.

Can the transformer survive it?

• Need some more info on the transformer. The 51.6C surface temperature of the transformer isn't really what you need, what you need is the energy consumed by the transformer - not the load, the transformer itself. You'd also need to provide the transformer's operating temperature range. – batsplatsterson Oct 26 '18 at 11:10
• Operating range of the transformer is -40C to +40C. How do you know or compute the energy consumed by the transformer? – Samzun Oct 26 '18 at 11:55
• You'd go by the efficiency of the transformer, say the efficiency is 93%, with a 500w load, that comes to 537w consumed, 37w will go to heat. With an ambient temp of 36*C, there's no way. – batsplatsterson Oct 26 '18 at 12:02
• What is the formula that relates 37w with 36*C or how do you convert 37w to heat? Also I'd like to know the temperature of air inside the enclosure.. 36*C is the temperature outside the enclosure. – Samzun Oct 26 '18 at 12:17
• Here is the spec sheet of it. farnell.com/datasheets/… the efficiency is 96%. With a 250w load, it's 260w consumed. Can mere 10w produce consant heat of 51 Celsius at the surface? If not, where does the heat come from? I'd like to know what will be the temperature of the air inside the sealed enclosure mentioned above if it will release the heat by convection to the air and wall, etc. given an outside ambient temperature of say 33 Celsius. – Samzun Oct 26 '18 at 12:58