Glossary of terms used on this site

There are 67 entries in this glossary.
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D

Term Definition
Degree Day

The number of degrees that the mean temperature for that day is below 65° F. (e.g. mean temp. of 40°F for the day--65-40=25 degree days).
Delta T.

Difference in-between LWT and EWT.
Desuperheater

A heat exchanger and pump system which removes a small portion of heat from the compressor discharge gas and typically transfers it to a domestic hot water tank.
Dual Condenser

A heat pump system which has the capability to switch, usually automatically, between an air and a water heat exchanger. Full capacity hot air or hot water output is available.