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A double flow-circuit heat exchange device for periodic positive and reverse directional pumping having at least two bi-directional fluid pumps. The bi-directional fluid pumps produce positive pressure or negative pressure at fluid ports on two sides of the bi-directional heat exchange device to per

A double flow-circuit heat exchange device for periodic positive and reverse directional pumping having at least two bi-directional fluid pumps. The bi-directional fluid pumps produce positive pressure or negative pressure at fluid ports on two sides of the bi-directional heat exchange device to periodically pump the fluid in positive and reverse flowing directions. During operation of the periodically positive and reverse pumping, the directional flow of the fluid in first and second flow fluid circuits are maintained in different flowing directions.

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1. 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

1. 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;at least two bidirectional fluid pumps, wherein a first of said two bidirectional fluid pumps is coupled to one of the inlet or outlet of the first flow circuit; and wherein a second of said at least two bidirectional fluid pumps is coupled to one of the inlet or outlet of the second flow circuit;a power source configured to provide power to the at least one bidirectional fluid pump;a periodic fluid direction-change operative control device configured to control operations of the at least two bidirectional fluids pumps;wherein the at least two bidirectional fluid pumps are separately arranged on the first and second flow circuit so that the periodic fluid direction-change operative control device is operable to periodically change a fluid flow direction of a fluid in the respective first flow circuit or the second flow circuit. 2. The system for exchanging heat between two fluids in a double flow circuit heat exchange device as claimed in claim 1, wherein the heat exchange device is a heat exchanger having two internal flow paths with heat absorbing and releasing and humidity absorbing and releasing capability. 3. The system for exchanging heat between two fluids in a double flow circuit heat exchange device as claimed in claim 1, wherein the periodic fluid direction-change operative control device is configured to provide one or more of the following operating functions: the at least two bidirectional pumps are configured to pump the fluid in the respective flow circuit using negative pressure to pump the fluids in different flowing directions;or the at least two bidirectional pumps are configured to pump the fluid in the respective flow circuit using positive pressure to pump the fluids in different flowing directions. 4. The system for exchanging heat between two fluids in a double flow circuit heat exchange device as claimed in claim 1, wherein when the periodic fluid direction-change operative control device changes the fluid flow direction, the periodic fluid direction-change operative control device is configured to change a flow rate of the fluid flow between no flow and maximum fluid flow in a stepped operation by controlling the rotational speed of at least one of said two bidirectional fluid pumps from idling to the maximum speed range. 5. The system for exchanging heat between two fluids in a double flow circuit heat exchange device as claimed in claim 1, wherein when the periodic fluid direction-change operative control device changes the fluid flow direction, the periodic fluid direction-change operative control device is configured to change a flow rate of the fluid flow between no flow and maximum fluid flow in a step-less operation by controlling the rotational speed of at least one of the at least two bidirectional fluid pumps from idling to the maximum speed range. 6. The system for exchanging heat between two fluids in a double flow circuit heat exchange device as claimed in claim 1, wherein the periodic fluid direction-change operative control device is configured so that the periodic change of the fluid flow is according to at least one of the following modes: the operational time for pumping the fluid in a first fluid flow direction and pumping the fluid in a second fluid flow direction are the same; andthe operational time for pumping the fluid in the first fluid flow direction and pumping the fluid in the second fluid flow direction are different. 7. The system for exchanging heat between two fluids in a double flow circuit heat exchange device as claimed in claim 1, wherein the periodic fluid direction-change operative control device is further configured to simultaneously operate in at least one of the following operational modes: pumping the fluid in one of the first and second flow circuits in a same flowing direction as a second fluid in the other flow circuit;reversely pumping the fluid out of one of the first and second flow circuits in the same flowing direction as pumping out of the second fluid in the other flow circuit; andpositively and reversely pumping the fluid in one of the first and second flow circuits in the same flowing direction as the second fluid in the other flow circuit. 8. The system for exchanging heat between two fluids in a double flow circuit heat exchange device as claimed in claim 1, wherein the periodic fluid direction-change operative control device is further configured to mitigate the impact generated by a gaseous or liquid fluid by operating in at least one of the following operational methods: when changing the fluid flow direction, the periodic fluid direction-change operative control device is configured to control at least one of the bidirectional fluid pumps so that the flow of fluid slowly reduces to no flow and then switches the direction of the fluid flow and slowly increases the flow rate of the fluid to a maximum preset value; andwhen changing the fluid flow direction, the periodic fluid direction-change operative control device is configured to control at least one of the two bidirectional fluid pumps so that the flow of fluid slowly reduces to no flow, and the at least one bidirectional fluid pump is stopped for a preset time period, and then after stopping the at least one bidirectional fluid pump, the at least one bidirectional fluid pump is switched to pump the fluid in a different direction to slowly increase the flow rate of fluid to a maximum preset value. 9. The system for exchanging heat between two fluids in a double flow circuit heat exchange device as claimed in claim 1, further comprising at least one of a temperature detecting device; and at least one of a humidity detecting device or a gaseous or liquid state detecting device, installed at positions capable of directly or indirectly detecting the humidity variation or gaseous and liquid fluid composition variation of the pumping fluid respectively. 10. The system for exchanging heat between two fluids in a double flow circuit heat exchange device as claimed in claim 9, wherein the periodic fluid direction-change operative control device is configured to control the fluid flow direction by manipulating a flow rate each of the flows of fluid in one or more of the following operational modes: the flow rate of pumping fluid is manually adjustable;the flow rate of fluid is operatively controlled when a detected signal of the at least one temperature detecting device reaches a set value;the flow rate of fluid is operatively controlled when a detected signal of the at least one moisture detecting device reaches a set value; andthe flow rate of fluid is operatively controlled when a detected signal of the at least one gaseous or liquid composition detecting device reaches a set value.