The U.S. Department of Energy (DOE) is currently conducting research into carbon gas-fired absorption heat pump water heaters. This project will employ innovative techniques to increase water heating energy efficiency over conventional gas storage water heaters by 40%.
This project seeks to develop a natural gas-fired water heater using an absorption heat. The development effort is targeting lithium bromide aqueous solutions as a working fluid in order to avoid the negative implications of using more toxic ammonia.
Research is being undertaken through a Cooperative Research and Development Agreement (CRADA) between DOE, Oak Ridge National Laboratory, and a CRADA partner.
The goal of this project is to develop of an absorption water heater with low direct GWP and zero ozone depletion potential.
Benefits and Impacts
The absorption water heater has a potential for 40% energy efficiency improvement over convention gas storage water heaters, and does not use refrigerants that have global warming impact.