This proposed CalNEXT project will develop a test method to validate that control programming is consistent with the control sequences in ASHRAE Guideline 36 (G36) High-Performance Sequences of Operation for HVAC Systems. The eventual goal is for the test method to evolve into an ASHRAE standard...

This project evaluates the performance of a production prototype residential three-function heat pump (TFHP) system. TFHPs are called “three function” systems as they utilize a single compressor to serve indoor heating, indoor cooling, and domestic hot water loads. The system evaluated in this...

The purpose of this project was to evaluate the performance of:Centrally ducted variable capacity heat pump (VCHP) systems.Packaged through the wall VCHP systems.Near zero global warming potential (GWP) heating and cooling technologies, including an advanced indirect/direct evaporative cooling...

Mechanical ventilation is becoming more prevalent due to Indoor Air quality (IAQ) concerns, particularly as construction trends move towards tighter envelopes to increase efficiency. Yet there is a tension between providing ventilation to ensure good IAQ and reducing the energy and demand impacts...

Laboratory cold storage solutions such as freezers, refrigerators, and cryogenic storage tanks are critical to keeping valuable reagents and priceless samples safe. Ultra-Low Temperature Freezers (ULTs) are designed for laboratory applications that maintain set point storage temperatures between...

120-volt plug-in heat pump water heaters (HPWHs) are a proven, market-ready technology offering significant decarbonization potential as emergency replacements in the small medium business market. It is estimated that 90% of water heating replacements occur on an emergency basis. Without an easy,...

Domestic hot water system electrification is a high-potential decarbonization opportunity in multifamily buildings. Based on U.S. government data, this end use accounts for 28% of multifamily residential energy consumption in the United States (EIA, 2016). Centralized heat pump water heating...

This Final Project Report summarizes the findings of PG&E’s Code Readiness Subprogram DOAS Field Research project, which collected dedicated outdoor air systems (DOAS) and variable refrigerant flow (VRF) system data from eight field sites. DOAS ventilation, which separates outdoor...

The proposed project will evaluate patent-pending compressor controller technology through a field demonstration. The field demonstration entails installing the technology onto an existing VRF system with inverter-driven compressor to understand its potential energy savings. Technology is...

This market characterization study builds on the efforts and findings of the 2022/2023 CalNEXT Residential Housing Characteristics Study ET22SWE0022. The ET22SWE0022 study's objectives were to: • Characterize existing DAC single family residence (SFR) building stock through publicly available...