[Equest-users] Groundwater Source Heat Pumps

[Dakota Kelley]

Omer,

Entering water is the ground loop temperature as it enters the condenser. Delta T is needed to calculate the efficiency of a specific condenser/heat exchanger, but it is not directly relevant to defining an overall system efficiency because EER/SEER/COP do not refer to the condenser alone. They quantify the total cooling/heating effect relative to compressor and fan input electrical power. Two different units may have the same EER but differing condenser delta T's at the same entering water temperature.

Thanks,
Dakota


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From: Ömer Moltay [mailto:omoltay at mimtarch.com]
Sent: Wednesday, November 07, 2012 8:09 AM
To: eQUEST Users List
Subject: [Equest-users] Groundwater Source Heat Pumps

Dear All,

ASHRAE 90.1-2007 minimum EER and COP ratings for heat pumps in Table 6.8.1B. The referenced testing is ISO 13256-1 and the rating condition is 59F entering water for cooling and 50F entering water for heating. What is the exact definition of "entering water"? Shouldn't both entering water and leaving water temperatures be specified (in other words delta T) for a meaningful efficiency requirement?

Thanks

Ömer Moltay
Mimta
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