Does PTAC consumes less energy than FCU+DOAs?

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Dear all

Now I'm doing a LEED-CS energy simulation, part of the project is
residential type and I use system 1(PTAC), and the proposed is FCU+DOAs. The
results shows that the baseline is consume less energy.

So the question is: Does PTAC consumes less energy than FCU+DOAs?

Of course I'm not sure whether I has modeled the PTAC correctly. So I put
some important images below. The cooling source is DX and the heat source is
hot water loop. The supply fan is 0.0003Kw/CFM, and I keep the EIR default
of 0.438 which is a low efficiency.

Could anyone tell me the cause or the mistake I've made? Thanks a lot!

Yours Zhiren Zhou

zhiren zhou's picture
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Bruce Easterbrook's picture
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the mostly common heating system for PTAC is generally heat pump with
electric backup.when I did modeling for it, the fan energy consumption was
very high.
Regards
Deepika

DEEPIKA KHOWAL

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And I saw the cooling electrical input power in the third screen is green (default value). May be you should change it according to ASHRAE 90.1 minimum equipment efficiency.

Jenny Zhang's picture
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