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Adsorption Heat Pump Water Heater

Lead Performer: Oak Ridge National Laboratory - Oak Ridge, TN
DOE Funding: $500,000
Project Term: Oct. 2013 - Sept. 2016

Project Objective

The objective of this project is to develop an adsorption heat pump water heater that will demonstrate an energy factor greater than 1.0 and at an installed cost low enough to enable widespread residential market adoption. The adsorption heat pump cycle has the potential for high reliability and durability due to the lack of moving parts. It is a competing technology to the absorption heat pump water heater, which deserves to be investigated in parallel. The project will identify the most promising types of adsorption materials and fluids specific to the water heating application, which is unique from those materials appropriate for air conditioning and space heating. The project will design and evaluate a prototype adsorption water heater to cost and performance targets that would enable widespread market adoption and significant national energy savings.

Project Impact

According to ORNL, the technology has the potential for 40% energy savings over other gas-fired water heaters. Fully deployed, this would provide up to 0.45 Quads of primary energy savings per year. Additionally, this would be using non-toxic working fluids with zero GWP and zero ODP.


DOE Technology Manager: Tony Bouza
Performer: Moonis Ally, Oak Ridge National Laboratory