[Equest-users] Reducing unmet hours

[Mallikarjuna MO]

Hi,

Try increasing sizing ratio from 1 to 1.25 (as per Appendix G) under air-side HVAC system properties.Try changing thermostat type to reverse action and throttling range to 6 deg F, which helps much in reducing unmet hours under air-side HVAC zone properties.Also, input reheat delta T in the range of 20-30 deg F under air-side HVAC system properties heating tab.Also try increasing minimum design flow (cfm/sf) for each zone.

Kind Regards,
Mallikarjuna

________________________________
From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of David Dowling
Sent: Thursday, August 13, 2009 12:38 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Reducing unmet hours

I have asked this before and I don't think anyone has suggested a good solution for reducing the total number of unmet hours, so I thought I would post this again.

Does any one have a nice check list of things to verify to reduce the total number of unmet hours without drastically changing the scheduling, throttling range, or sizing ratios?  What I have had to do previously is adjust the sizing ratio for each system until it is within the range specified under ASHRAE 90.1-2004; which can cause other problems when sizing ratios exceed 2.00.  Alternatively, is there a way to change how eQUEST auto-sizes each piece of equipment so that it actual can size the equipment to match the required load.  I think this is probably the underlying problem that I am having and I can't imagine that I am the only one having this issue.  Let me know if anyone has any ideas.

Thank you,

[cid:image001.jpg at 01CA1C00.8010E8D0]
David Dowling
Mechanical Designer
WEST PLAINS ENGINEERING, INC.
1750 Rand Road
Rapid City, SD  57702
Phone: (605) 348-7455  Fax: (605) 348-9445
david.dowling at westplainsengineering.com<mailto:david.dowling at westplainsengineering.com>
www.westplainsengineering.com<http://www.westplainsengineering.com/>



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