[Equest-users] Groundwater Source Heat Pumps

Ömer Moltay omoltay at mimtarch.com
Wed Nov 7 06:08:40 PST 2012

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?


Ömer Moltay

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