[Equest-users] Groundwater Source Heat Pumps

Ömer Moltay omoltay at mimtarch.com
Thu Nov 8 11:31:52 PST 2012


Thanks for the information. Apart from the condenser side, shouldn't the 
COP be dependant on the leaving water and return water temperatures? How 
are they specified in Table 6.8.1B?

Thanks,

Omer Moltay
Mimta

08.11.2012 17:50 tarihinde, Dakota Kelley yazd?:
>
> 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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