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Re: [EnergyPlus_Support] electric power (watts) of PTAC
You need to identify the maximum power draw of your fan and compare that
to your design intent.
Report these 2 report variables:
Output:Variable,*,Fan Electric Power,timestep;
Output:Variable,*,Packaged Terminal Air Conditioner Fan Part-Load
Ratio,timestep;
and, if you are using an On/Off Fan object:
Output:Variable,*,On/Off Fan Runtime Fraction,timestep;
Maximum fan power is then roughly equal to Fan Electric Power / Packaged
Terminal Air Conditioner Fan Part-Load Ratio or is equal to Fan Electric
Power / On/Off Fan Runtime Fraction.
Another method is to either look for a time during the simulation when
the PTAC is operating at full load or force the PTAC to operate at full
load and then look at the reported fan power for that time period.
You will then need to determine if this maximum fan power is
representative of your system.
Fan power of 900 W sounds high for a PTAC (unless it is very large), my
AC system at 3 tons (10.5 kW) gives an estimated fan power of 0.018 W
per W of rated capacity.
Hu,Jia wrote:
>
> Thank you, Richard.
>
> It is realistic then to have the HVAC consumption of 200 W per hour
> (let's say on average) or in the range of 200-900 W per hour
> depending on a day, time, that is, external weather conditions.
>
--
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
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