[Equest-users] Does PTAC consumes less energy than FCU+DOAs?

[Jenny Zhang]

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.


From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Bruce Easterbrook
Sent: 2010年12月13日 23:41
To: zhiren zhou
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Does PTAC consumes less energy than FCU+DOAs?

On your bottom screen adjust the throttling range, try 2 and 4.  .3 is too tight, the system will fight itself.
Bruce Easterbrook
Abode Engineering

On 13/12/2010 08:52 AM, zhiren zhou wrote:
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

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