The DOE/ORNL Heat Pump Design Model

Researcher using ORNL Heat Pump Design Model

The DOE/ORNL Heat Pump Design Model (HPDM) is one of the most widely used software products of the BTC Heating and Cooling Program. Over 300 copies of the model have been distributed to users worldwide, and it is actively used by companies representing about 30% of the U.S. unitary equipment market.

In the latest HPDM release, Mark V, capability has been included to simulate air-to-air heat pumps using R-410, R-507C, and R-404A — leading near-azeotropic HFC alternatives to R-22. One natural refrigerant, propane (R-290), has also been included. Users have included Allied-Signal, which used the model to optimize heat pump systems using R-410A and was able to show an improvement in efficiency over R-22, and Purdue, which selected the HPDM over two other public domain models for use in simulating heat pump performance at extreme ambient conditions under an ASHRAE-funded research project. An interactive version of the Mark V model is available on the World Wide Web at

ORNL and DOE are currently interviewing current and potential users of the HPDM to determine what improvements are needed to maintain and improve its usefulness to U.S. industry and researchers for future heat pump/air-conditioner product design and development. Possible improvements include

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