Patent ID: 8602087

Claim:
A system for exchanging heat between two flows of fluids in a double flow circuit heat exchange device comprising: a heat exchange device having a first flow circuit and a second flow circuit being configured to exchange heat between two flows of fluid, said first flow circuit having an inlet and an outlet and said second flow circuit having an inlet and an outlet, wherein the inlet of the first flow circuit has a first fluid port, the inlet of the second flow circuit has a second fluid port, the outlet of the first flow circuit has a third fluid port, and the outlet of the second flow circuit has a fourth fluid port; a plurality of unidirectional fluid pumps coupled to the heat exchange device, each of said plurality of unidirectional fluid pumps configured to pump a fluid, wherein a first fluid pump is coupled to the first fluid port, a second fluid pump is coupled to the second fluid port, a third fluid pump is coupled to the third fluid port, and a fourth fluid pump is coupled to the fourth fluid port; a power source configured to provide power to each of the plurality of unidirectional fluid pumps; a periodic fluid direction-change operative control device configured to control operation of each of the plurality of unidirectional fluid pumps; wherein the plurality of unidirectional fluid pumps are arranged on the respective ports of the first and second flow circuits so that the periodic fluid direction-change operative control device is operable to periodically change a fluid flow direction of a first fluid in the first flow circuit and a fluid flow direction of a second fluid in the second flow circuit.