Re: [EnergyPlus_Support] Re: Cooling Coil Rated COP in HVACTemplate:System:Unitary

[Richard Raustad <RRaustad@xxxxxxxxxxxx>]

Description in the Input Output Reference document for the 
Coil:Cooling:DX:SingleSpeed object.

Field: Rated Total Cooling Capacity
The total, full load cooling capacity (sensible plus latent) in watts of 
the DX coil unit at rated conditions (air entering the cooling coil at 
26.7°C drybulb/19.4°C wetbulb, air entering the outdoor condenser coil 
at 35°C drybulb/23.9°C wetbulb9, and a cooling coil air flow rate 
defined by field “rated air volume flow rate” below). Capacity should be 
“gross” (i.e., supply air fan heat is NOT included). When used in a heat 
pump, the rated total cooling capacity should be within 20% of the rated 
total heating capacity, otherwise a warning message is issued.

Field: Rated COP
The coefficient of performance (cooling power output in watts divided by 
electrical power input in watts) of the DX cooling coil unit at rated 
conditions (air entering the cooling coil at 26.7°C drybulb/19.4°C 
wetbulb, air entering the outdoor condenser coil at 35°C drybulb/ 23.9°C 
wetbulb, and a cooling coil air flow rate defined by field “rated air 
volume flow rate” below). The input power includes electric power for 
the compressor(s) and condenser fan(s) but does not include the power 
consumption of the supply air fan. The cooling power output is the value 
entered above in the field “Rated Total Cooling Capacity (gross)”. If 
this input field is left blank, the default value is 3.0.

On 2/14/2012 11:30 AM, malindow wrote:
> Hi Bereket,
>
> > From where you know that? Because I need a supporting document to be presented to my professor. If I don't have any supporting document about "the electrical power input includes the compressor power consumptions in Watts at the rated conditions and the condenser power consumptions in Watts", my prof wouldn't believe it
>
> Thank you for your help
>
> Regards,
>
> Malindo
> Mech. Engineering student
> Singapore
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Bereket Nigusse<nigusse_ba@...>  wrote:
>> Hello,
>> Â
>> The electrical power input includes the compressor power consumptions in Watts at the rated conditions and the condenser power consumptions in Watts.
>>
>>
>> Bereket
>>
>> --- On Mon, 12/26/11, malindow<fypguevibyor@...>  wrote:
>>
>>
>> From: malindow<fypguevibyor@...>
>> Subject: [EnergyPlus_Support] Cooling Coil Rated COP in HVACTemplate:System:Unitary
>> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
>> Date: Monday, December 26, 2011, 11:33 PM
>>
>>
>>
>> Â
>>
>>
>>
>> Hi,
>>
>> I read from the documentation that cooling coil rated COP is defined as the gross cooling coil capacity in watts divided by electrical power input in watts of the DX cooling coil unit.
>>
>> Does the electrical power input of DX cooling coil unit refer to power input to compressor when compressing the refrigerant in the vapor-compression refrigeration cycle?
>>
>> Regards,
>>
>> Malindo
>> Mech. Engineering student
>> Singapore
>>
>
>
>
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-- 
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
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Fax:     (321) 638-1439 or 1010
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