Electrified Water-Source Heat Pump System Design Guide

This Engineers Newsletter serves as a guide on electrified water-source heat pump (eWSHP) systems, detailing various configurations and their performance characteristics. It begins by defining key terminology related to water-source heat pump (WSHP) systems, including the distinctions between traditional and electrified systems. The document outlines the components of WSHP systems, such as the common water loop, heat rejection devices, and control systems that regulate temperature. A significant focus is placed on the advantages of electrified systems, particularly in reducing on-site CO2e emissions and water usage. The guide also discusses the sizing requirements for air-to-water heat pumps (AWHPs) and the importance of temperature control in maintaining system efficiency. Specific standards, such as ASHRAE Standard 90.1, are referenced to highlight temperature control requirements. The document emphasizes the need for careful consideration of heating and cooling setpoints to achieve optimal performance in electrified WSHP systems.