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Index
FAQs
Reference
Fundamentals
Ground Water
(Open-Loop)
Systems
Environment
Equipment
Ground-Coupled
(Closed-Loop)
Systems
Special Considerations
Installations
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Closed-Loop Certification
 Manufacturers of products certified by the Air-conditioning and Refrigeration
Institute (ARI
) Standard 330 for ground source closed-loop heat pump equipment, publish a
capacity rating for each model cataloged at the standard entering water rating
conditions of both 77°F for cooling and 32°F for heating. The cooling EER,
heating COP and fluid flow for both is also published. 
In calculating the cooling Standard Energy Efficiency Rating (EER) and the
heating Coefficient of Performance (COP), a penalty for the water pump effect of
0.8 watts per gallon per minute per foot of head is added to the measured power
input. This approximates a 25% total pump efficiency. Further more, a 17 foot
pressure drop shall be added for the loop to determine the total pressure drop
of the system for the pumping penalty.
You should not confuse the ARI Standard Energy Efficiency Rating with the expression SEER. The latter stands
for Seasonal Energy Efficiency Ratio. SEER is a measure of seasonal cooling
efficiency under a range of weather conditions, assumed to be typical for a
location, and of performance losses due to cycling under part load conditions.
Ground-coupled units for use in Canada should be also rated in accordance with
the Canadian Standards Association (CSA) and the Canadian Earth Energy
Association (CEEA).
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