[Equest-users] App G HVAC System 5

[Sami, Vikram]

The first question is - are your fans scheduled properly (if you have loads but your fans aren't allowed to turn on that might be the issue).

Look at your SS-O reports and figure out what hours you aren't meeting the loads. You might have to turn on night cycling.

Is your model set up for reheat at the box?


Vikram Sami, LEED AP BD+C
Sustainable Design Analyst
1315 Peachtree St. NE, Atlanta, GA 30309
t: 404-443-7462    f: 404.892.5823       e: vikram.sami at perkinswill.com   www.perkinswill.com<http://www.perkinswill.com/>
Perkins+Will.  Ideas + buildings that honor the broader goals of society


From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Ben Pressman
Sent: Thursday, June 30, 2011 12:14 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] App G HVAC System 5

My baseline model requires system 5 from 90.1 app G table G3.1.1A, packaged VAV with HW reheat with 2 boilers. I believe I've followed all the instructions from 90.1 but I'm having trouble sizing it properly. I get thousands of unmet heating hours in every single zone, and my coil heating load from SS-D (-279 kBtu/hr) is less than my total space load from LS-D (-311 kBtu/hr). In addition, it appears that only one of my boilers ever runs.

I feel that I do not fully understand how to properly size systems in eQuest, and can identify the problem but not always solve it. Are there resources out there for system sizing? Also, has anyone had experience with the problem I described above and might know how to start solving it?

Thank you,

Ben Pressman, EIT, BESA
Project Engineer

Practical Energy Solutions
101 E. Evans Street, Suite 2
West Chester, PA   19382
ph: 610.430.1382
fax: 610.430.1375
cell: 610.733.9518
web: http://www.practicalenergy.net<http://www.practicalenergy.net/>



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