HAP v4.91 vs v5.11 energy use diference

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Dear Everyone

We finalized our first energy model in new HAP version (v5.11i) for LEED certification and we found some unexpected savings on ventilation section. Then we convert project to older version (v4.91i) that we used for our previous projects and we found huge difference in Baseline VAV system. System sizing is similar but simulated AHU fan energy use is different. Difference is in supply air volume hourly which I check in system psychometric report.

The question is if this difference is bug in new version or if old bug has been corrected in newer version. AHU energy use increases 4xtimes. Our building received 17% unexpected more savings so we wonder if we can submit this result.

Did someone enountrer such problem?

Best Regards

Building Energy Modeling Specialist

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