Dear all,
Recently we received a review comment on PV-A report, where the reviewer has pointed out the discrepancy in the chilled water loop flow reported in PV-A and the total chiller flow. The reviewer has provided a comment stating "The sum of the chiller loop flows is not expected to differ from the chilled water recirculation loop flow. In PV-A report, there is difference in total chiller flow rates and the chilled water loop flow." The reviewer is referring to the 'Loop flow (Gal/min) in the "chilled water loop" section of PV-A and comparing this with the chiller flow (Gal/min)provided in the "Primary Equipment" section of PV-A report.
We understand that "In DOE-2, the chilled water loop flow reported in PV-A represents the sum of all air-side coil design flows, which are calculated at non-coincident system peak conditions. Each AHU is sized based on its individual peak load, which occurs at different times across the building due to variations in orientation, schedules, and internal gains. As a result, the aggregated loop flow reflects a non-coincident total, which is inherently higher than the coincident building peak used for plant sizing. In contrast, chiller flow is based on the coincident plant load at the time of building peak demand and the plant loop design conditions. Therefore, the total chiller flow represents the flow required under peak plant operation and is not expected to match the non-coincident chilled water loop flow reported in PV-A."
Is the above understanding correct and can it be explained in the same way to the reviewer?
Thank you.