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Re: [EnergyPlus_Support] electric power (watts) of PTAC
The fan power depends on the flow rate, pressure rise, and efficiency of
the fan. To give you a ballpark start, I measured the fan power on my
3-ton AC system at home. At 1450 cfm, the fan power was 190W at 0.6 inwc
external static pressure. Adding in an estimated 0.5 inwc for the coil
pressure drop and an estimated 0.1 inwc losses at the entrance/exit of
the unit gives a pressure rise of 1.2 inwc for this fan. Hope this helps.
Hu,Jia wrote:
> Hello, all:
> I use Gainesville (in FL) weather file to simulate a small office with
> 3m(width)*5m(length)*3m(height). The window faces south and is located
> in the wall that is 3m * 3m. I autosize PTAC (The design day is from
> the weather file). And I calculate its electric power (watt) as you
> can see from excel file at URL:
> http://groups.yahoo.com/group/EnergyPlus_Support/files/_Problem_Submittals/watt.xls
> <http://groups.yahoo.com/group/EnergyPlus_Support/files/_Problem_Submittals/watt.xls>
>
> You can download the excel file to see the values of PTAC energy
> consumption (in watts).
> *my question is that whether the values of energy consumption of PTAC
> (in watts), indicated in the excel file, are realistic ? *
> Thank you in advance.
> Jia Hu
>
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