#### Geothermal Heat Pump Theory

**Glossary of Terms**

Since the following pages will be devoted to the understanding of heat pumps and their applications it will be helpful to become familiar with the following terms:

**Heat Pump**--A heat pump is any device that moves heat from
one place to another

**Heat Source**--The area where heat is taken from (Water,
air, etc.)

**Heat Sink**--The area where heat is deposited (Inside a home,
etc.)

**Evaporator**--The heat absorbing mechanism in a heat pump

**Condenser**--The heat rejecting mechanism in a heat pump

**COP**--The coefficient of performance of a heating system
is a ratio of the heat we get out divided by the heat we put in electrically

**SCOP**--The SEASONAL COEFFICIENT OF PERFORMANCE is the average
COP over the entire heating season

**EER** -- The ENERGY EFFICIENCY RATIO is the ratio of Btu's
of cooling divided by total watts used

**SEER** -- Average EER over entire cooling season

**Degree day**--the number of degrees that the mean temperature
for that day is below 65° F (eg. mean temp. of 40 for the day--65-40=25
degree days)

**CFM**--Cubic feet per minute of air flow

**KWH**--Kilowatt hours

**BTU**--British thermal units (method of measuring a quantity
of heat). The amount of heat required to raise one pound of water 1°
F.*( 1 BTU= WATTS * 3.413; 1 WATT = 3.413 BTU'S)*