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Dear Everyone I am writing to enquire about Carrier HAP v5.11i and v4.91i simulation metod difference. We finalized our first energy model in new HAP version (v5.11i) 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 uses 4x more energy. Our building received 17% unexpected more savings point so we wonder if we can submit this result. Best Regards

Dear Everyone I am writing to enquire about Carrier HAP v5.11i and v4.91i simulation metod difference. We finalized our first energy model in new HAP version (v5.11i) 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 uses 4x more energy. Our building received 17% unexpected more savings point so we wonder if we can submit this result. Best Regards