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Project Info COMPLETE Project Title

Evaluation of and Algorithm Development for the IAPMO Test Protocol for Horizontal Drain Water Heat Recovery Devices

Project Number C&S PG&E 2019_2 Organization PG&E End-use Water Heating/DHW/HPWH Sector Commercial Project Year(s) 2019 - 2019
Description

This project created algorithms predicting the performance of drain water heat recovery devices as a function of their installed angle. The algorithms use the same process as previous Pacific Gas and Electric (PG&E) drain water heat recovery projects1. Four representative DWHR devices, two horizontal and two vertical, were installed at the PG&E Applied Technology Services (ATS) laboratory. Tests identified the steady state effectiveness of these devices at different installation angles. Based on recommendations from device manufacturers, the horizontal devices were tested at a range from 3 to 30 degrees from horizontal, and the vertical units were tested at a range from 70 to 87 degrees from horizontal. Tests on horizontal devices started at 3 degrees, not fully horizontal, because plumbing codes typically stipulate a minimum slope of ~3 degrees to ensure proper drainage.

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The ETCC is funded in part by ratepayer dollars and the California IOU Emerging Technologies Program, the IOU Codes & Standards Planning & Coordination Subprograms, and the Demand Response Emerging Technologies (DRET) Collaborative programs under the auspices of the California Public Utilities Commission. The municipal portion of this program is funded and administered by Sacramento Municipal Utility District and Los Angeles Department of Water and Power.