The Berkeley Decarb Tool (the “Tool”) is an open-source web platform that helps users evaluate the energy and carbon performance of different heating, ventilation, and air-conditioning (“HVAC”) systems and equipment, and hosted by UC Berkeley’s Center for the Built Environment (“CBE”)...

Small food service businesses, such as corner stores and neighborhood bars/restaurants, depend heavily on small refrigeration systems to preserve perishable goods. These systems typically hold less than 50 pounds (“50-lbs”) of refrigerant and are currently unregulated by the state. Presently, many...

Retrofitting multifamily buildings with domestic hot water (“DHW”) recirculation systems to support efficient electrification, load shifting and demand response is challenging due to limited mechanical space, high upfront costs, and performance constraints.This project will validate the performance...

This report presents a field evaluation of flexible demand events with heat pump water heaters (HPWHs) operating in 10 occupied single‑family homes in the San Joaquin Valley. The study examined HPWH responses to California Energy Commission’s Title 24, Joint Appendix 13 defined “light shed” and...

The Code Readiness research team is conducting field monitoring studies on commercial hybrid HPWH systems installed in nonresidential buildings located in California. The intent of this research is to better understand energy performance of the commercial hybrid 120-gallon HPWH systems recently...

In 2024, PG&E’s Code Readiness Program research team initiated a research project for circulator pumps to identify and estimate energy savings and costs for different types of controls for circulator pumps in multifamily and non-residential buildings. The findings from this research will be...

The Code Readiness research team is conducting field demonstrations on large central heat pump water heater (CHPWH) systems installed in multifamily buildings located in California. The intent of this research is to better understand energy performance of CHPWH systems configured as single-pass and...

The goal of this project is to provide additional insight into the GAHP Tool development based on the following: -Overall daily and annual emissions savings estimates with the option to see a California-specific summary to understand the greenhouse gas (GHG) emissions impact. -A laboratory results...

Spas or hot tubs are normally used year-round, unlike heated pools. Spas typically maintain water temperatures between100-104 F which require fast heating for better customer experience. Spa heating and pool-spa configurations generally involve how the water is heated and circulated between pool...

This is an agile project idea to compare DHW sizing tools to actual site data for (9) multifamily sites. A comparison of data for (6) sites was done in ET23SWG0012 GAHP Sizing, Screening and Design. An additional (9) sites would further refine this analysis to make observations which would be...