[Equest-users] Performance Curves for smaller HVAC units

[Chris Jones]

Did you check the SS-P report, Cooling Performance?  You can see the 
hours at different part loads.  0%, 10%, 20%, etc.

As well, a DX system has 4 curves for the DX cooling capacity at part 
load.  Did you generate custom curves for all four?

At 04:11 PM 20/07/2012, Bobby Almeida wrote:
>Content-Language: en-US
>Content-Type: multipart/related;
> 
>boundary="_005_E4EF761DC1475A4F858D11CE77CC04BE3337509D98EXCH01dcsrvlo_";
>         type="multipart/alternative"
>
>Hi everyone,
>
>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)
>
>Unit 1                    Unit 2
>Full Load              11.0 EER               11.9 EER
>75%                        11.2 EER               15.5 EER
>50%                        12.1 EER               23.5 EER
>25%                        11.4 EER               25.0 EER
>
>
>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?
>
>Thanks,
>
>
>Bobby Almeida
>Description: LEEDAP_BDCcmyk
>
>Project Engineer
>
>Description: New Image_033010 copy_reduced
>
>4051 Glencoe Ave. Suite 5
>Marina del Rey, CA 90292
>p. 310.591.8172
>c. 925.980.2025
><http://www.gaiadevelopment.com/>www.gaiadevelopment.com
>
>P Please consider the trees before printing this email
>
>Legal Notice: This message and any materials attached are 
>confidential, and are intended solely for the use of the addressee. 
>If you are not the intended recipient, be advised that unauthorized 
>use, disclosure, copying, or distribution is strictly prohibited. If 
>you received this message in error please do not read it, notify the 
>sender, and delete your copy immediately.
>
>
>
>_______________________________________________
>Equest-users mailing list
>http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
>To unsubscribe from this mailing list send  a blank message to 
>EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG

 >>
Christopher Jones, P.Eng.
Suite 1801, 1 Yonge Street
Toronto, ON M5E1W7
Tel. 416-203-7465
Fax. 416-946-1005
email cj at enersave.ca
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20120720/804c8496/attachment-0002.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 662c82f.jpg
Type: application/octet-stream
Size: 1140 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20120720/804c8496/attachment-0004.obj>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 662c84f.jpg
Type: application/octet-stream
Size: 4780 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20120720/804c8496/attachment-0005.obj>