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Open-loop heat-recovery dryer

United States Patent

8,572,862
November 5, 2013
View the Complete Patent at the US Patent & Trademark Office
Pacific Northwest National Laboratory - Visit the Technology Commercialization Program Website
A drying apparatus is disclosed that includes a drum and an open-loop airflow pathway originating at an ambient air inlet, passing through the drum, and terminating at an exhaust outlet. A passive heat exchanger is included for passively transferring heat from air flowing from the drum toward the exhaust outlet to air flowing from the ambient air inlet toward the drum. A heat pump is also included for actively transferring heat from air flowing from the passive heat exchanger toward the exhaust outlet to air flowing from the passive heat exchanger toward the drum. A heating element is also included for further heating air flowing from the heat pump toward the drum.
TeGrotenhuis; Ward Evan (Kennewick, WA)
Battelle Memorial Institute (Richland, WA)
12/ 911,631
20120096732
October 25, 2010
ACKNOWLEDGMENT OF GOVERNMENT SUPPORT This invention was made with government support under Contract DE-AC0576RLO1830, awarded by the U.S. Department of Energy. The government has certain rights in the invention.