May 2017

ORNL Report

High Efficiency Water Heating Technology Development – Final Report, Part II: CO2 and Absorption-Based Residential Heat Pump Water Heater Development

By:
Gluesenkamp, Kyle R; Abdelaziz, Omar A; Patel, Viral K; Mandel, Bracha T; De Almeida, Valmor F
Publication Date:
May 2017

Abstract

The two objectives of this project were to 1. demonstrate an affordable path to an ENERGY STAR®–qualified electric heat pump water heater (HPWH) based on low-global warming potential (GWP) CO2 refrigerant, and 2. demonstrate an affordable path to a gas-fired absorption-based heat pump water heater with a gas energy factor (EF) greater than 1.0. The first objective has been met, and the project has identified a promising low-cost option capable of meeting the second objective. This report documents the process followed and results obtained in addressing these objectives.


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