Title:
FREEZE PROTECTION FOR HEAT PUMP SYSTEM
Document Type and Number:
WIPO Patent Application WO2005057094
Kind Code:
A3
Abstract:
A heat pump system includes a liquid pump used to circulate liquid through the system to prevent freezing when the heat pump is off. In the system, the liquid is circulated in the reverse direction. The liquid used to prevent freezing comes from the hot section of the storage reservoir, such that the flow rate can be reduced while achieving the same amount of freeze protection. Also, as the hot liquid is circulated through the system at the low flow rate, it will become cold through heat transfer with the system as it prevents freezing and will be delivered to the cold section of the storage reservoir at a low temperature. As indicated above, the colder the temperature of the liquid supplied to the heat pump during operation, the more efficient the heat pump system will be. The present invention also prevents the cold liquid from lowering the temperature of the hot section of the storage reservoir during the freeze protection mode.
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Inventors:
SIENEL TOBIAS (US)
PONDICQ-CASSOU NICHOLAS (FR)
PONDICQ-CASSOU NICHOLAS (FR)
Application Number:
PCT/US2004/039834
Publication Date:
June 08, 2006
Filing Date:
November 29, 2004
Export Citation:
Assignee:
CARRIER CORP (US)
International Classes:
F25B29/00; F25B30/02; F25B47/00
Foreign References:
| US3965972A | 1976-06-29 | |||
| US4375831A | 1983-03-08 | |||
| US2461449A | 1949-02-08 |
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