[Equest-users] Unmet Load Hours - VAV with no re-heat

Dana Etherington Dana.Etherington at crbusa.com
Fri May 4 06:48:02 PDT 2012

Hi folks,

We are modeling a large facility operating with multiple VAV AHUs with central heating and cooling coils, but no re-heat at the zones. There are high heat loads in the spaces and therefore higher return air temperatures than the norm.

When I remove the re-heat from the systems I have excessive unmet load hours (heating). I have specified "HEAT-SET-T" to activate the central heating coil. I also have cooling control set to "warmest" and heat control set to "coldest". If I do not set the coil capacity it is still not meeting the loads. The only way I have been able to eliminate these unmet hours is by adding the re-heat back in or changing it to a multi-zone (MZS) system with all the same parameters.

If I model this scenario using the multi-zone system in eQuest to get around this would that be vastly different than VAV with no re-heat? Has anyone had this issue before? Any insight is appreciated. Thanks!


Mr. Dana Etherington, E.I.T., LEED AP BD+C | CRB | One Kendall Square Ste B2202 | Cambridge, MA 02139
Main: 617-475-3050 | Direct: 617-475-3061 | Mobile: 617-583-3009 | Fax: 617-475-3052 | Ext: 6061
Email: dana.etherington at crbusa.com<mailto:dana.etherington at crbusa.com> | www.crbusa.com<http://www.crbusa.com/>

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