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Did you check the SS-P report, Cooling Performance? You can see the
hours at different part loads. 0%, 10%, 20%, etc. <br><br>
As well, a DX system has 4 curves for the DX cooling capacity at part
load. Did you generate custom curves for all four? <br><br>
At 04:11 PM 20/07/2012, Bobby Almeida wrote:<br>
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Hi everyone,<br>
<br>
I’m making a model and we’re looking into the energy impact of higher
performance HVAC units. Because of the climate the units work at part
load most of the time so the part load efficiencies make a huge
difference. For example the 2 units I’m comparing have performances of
(12 ton units)<br>
<br>
Unit
1
Unit 2<br>
Full
Load
11.0
EER
11.9 EER<br>
75%
11.2
EER
15.5 EER<br>
50%
12.1
EER
23.5 EER<br>
25%
11.4
EER
25.0 EER<br>
<br>
<br>
I’ve gone into excel and made curves, normalized them, and found the
coefficients to enter into a custom performance curve, as described in
previous threads on the user group. I attached that curve to the unit and
found that the unit with a high IEER (unit 2) barely performed better
than the default curve in eQuest. The project is pursuing LEED
certification and we need to get all of the energy savings possible. My
main question is how do I best model the performance curves for baseline.
I tried changing the curve in baseline so that it would be at 1 no matter
the load, which raised the cooling load to a number that seemed too
large. Does anyone have experience making good curves for baseline so
that I can correctly claim the savings for the high IEER unit? The
project also has some large air handlers with high efficiencies at part
load. Would it be any different to make a baseline curve for an air
handler with VAV?<br>
<br>
Thanks,<br>
<br>
<br>
Bobby Almeida
<img src="cid:.0" width=19 height=21 alt="Description: LEEDAP_BDCcmyk">
<br>
Project Engineer<br>
<br>
<img src="cid:.1" width=62 height=83 alt="Description: New Image_033010 copy_reduced">
<br>
4051 Glencoe Ave. Suite 5 <br>
Marina del Rey, CA 90292<br>
p. 310.591.8172<br>
c. 925.980.2025<br>
<a href="http://www.gaiadevelopment.com/">www.gaiadevelopment.com</a><br>
<br>
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Christopher Jones, P.Eng.<br>
Suite 1801, 1 Yonge Street<br>
Toronto, ON M5E1W7<br>
Tel. 416-203-7465<br>
Fax. 416-946-1005<br>
email cj@enersave.ca<br>
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