ET25SWE0065 - Modeling Distributed PCM CHPWH Systems

This project addresses a critical market barrier: the lack of modeling tools capable of simulating distributed Phase Change Material (“PCM”) Thermal Energy Storage Systems (“TESS”) integrated with Central Heat Pump Water Heaters (“CHPWH”). Existing tools are not designed to capture the dynamic behavior of PCM systems, particularly in recirculation loop configurations. This modeling gap limits the ability of designers, program administrators, and policymakers to evaluate system performance, cost-effectiveness, and eligibility for incentives, ultimately hindering the broader adoption and integration of these emerging technologies into programs.

The project aims to identify key inputs for optimizing system design and energy cost savings through the development of dynamic models of PCM recharge loops and analysis of building and system characteristic variables. The central hypothesis is that integrating distributed PCM TESS into CHPWH systems can significantly reduce recirculation losses and improve energy performance in multifamily buildings, especially those with space-constrained mechanical rooms. 

By developing dynamic modeling tools and updating existing platforms, the project will enable more accurate assessments of system benefits, facilitate incentive qualification, and support broader adoption of PCM-integrated designs in California’s multifamily housing sector. These improvements will support more effective CHPWH upgrades, contributing to electrification and decarbonization goals in multifamily housing.