SolarAttic PCS1, User Manual

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Dictionary of Terms Page 2 of 4
Dictionary of Terms
Air to Liquid A heat transfer term referring to the transfer of heat from air to
liquid or vice versa.
Bypass Valve A valve used to route water up to the PCS1 when heat is
available in the attic.
BTU British Thermal Unit. The quantity of heat required to raise one
pound of water one degree Fahrenheit. A way to measure heat
transfer.
BTU'S/HR The hourly rate of BTU heat transfer. Calculated by the formula:
BTU'S per hour =
D
T x 8.34 x 60 x GPM
D
T Symbol for temperature differential. Usually the output
temperature minus the input temperature. This can be either
air or liquid temperatures. It can also be the temperature
difference between two heat containers. In our material, it refers
to the temperature difference between the output and the input of
the PCS1. This can be either the water temperature difference or the
air temperature difference. It also can be the difference between
the pool's water temperature and the attic temperature.
8.34 The weight of a gallon of water. A factor used in BTU
calculations.
60 The minutes in an hour. A factor used in BTU calculations.
CFC Chlorofluorocarbon chemicals found to damage the earth's
protective ozone layer. Found in swimming pool heat pumps.
Circuit Refers to the heat transfer pipes that carry or are surrounded by
swimming pool water inside a heat exchanger.
Coil Refers to the water coil used in the PCS1 which is used to
transfer heat from the attic air into the swimming pool's water.
Comfort Zone The temperature at which water is the most comfortable for
swimming. That zone is from 80-84
°
F. Olympic and
competitive pools maintain 78-80
°
F.
Convection A heat transfer principle where heat moves from one substance
to another by "convection". This usually means passive heat