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System types selected for the Appendix G System 7 baseline model. And if it is right to have assigned a reheat at the system level which makes assigns a reheat for the core zones automatically in the baseline model

asked 2019-01-10 11:27:31 -0500

updated 2019-01-10 13:46:15 -0500

We are modelling a core & shell office building for LEEDv4 with multiple shells in e-Quest.

1) The proposed model(design) has floor level AHU’s of type ‘PIU’ with terminal Fan powered boxes at the perimeter zones and terminal VAV boxes at interior core zones. Perimeter zones have hot water reheat. The reheat deltaT at core zones was manually set to zero because the core zones require only cooling. 2) The baseline model has floor level AHU’s of type ‘Variable Air Volume’ with reheat temperature given at the system level (not possible to give a reheat temperature at zone level). Results show that the baseline heating is way worse than the proposed( by 40%) which doesn’t seem right. Core zones in the baseline model have a heating demand (confirmed through SV-A summary report) which may be the reason for the increased heating energy use

Please advise if the system types selected are the right one’s for the Appendix G System 7 baseline model. And if it is right to have assigned a reheat at the system level which makes assigns a reheat for the core zones automatically in the baseline model

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answered 2019-08-19 07:44:16 -0500

I'd think this is correct. The one element I would have examined in the thermostat type; Proportional vs Reverse-Acting. These have the impact of being either a single max or a dual max VAV box, respectfully. This can really sway heating consumption, even for similarly System to zone(s) grouping between Baseline and Proposed.

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Asked: 2019-01-10 11:27:31 -0500

Seen: 1,616 times

Last updated: Aug 19 '19