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,
David Dowling
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