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A bidirectional pumping device or two unidirectional pumping devices arranged to pump in opposite directions are connected in series with a conventional cold heat-absorbing or warm heat-dissipating energy discharge device, in order to carry out periodic positive and reverse directional pumping. By c

A bidirectional pumping device or two unidirectional pumping devices arranged to pump in opposite directions are connected in series with a conventional cold heat-absorbing or warm heat-dissipating energy discharge device, in order to carry out periodic positive and reverse directional pumping. By changing the flow direction of the fluid passing through the flow circuit, temperature differences and impurity accumulation in the heat absorbing/release device are reduced.

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1. A single flow circuit, comprising: an energy discharge device including a heat exchanger for exchange of energy with a fluid in the single flow circuit; andreversible pumping means consisting of a pumping device in series with the energy discharge device for pumping said fluid in a first flow dir

1. A single flow circuit, comprising: an energy discharge device including a heat exchanger for exchange of energy with a fluid in the single flow circuit; andreversible pumping means consisting of a pumping device in series with the energy discharge device for pumping said fluid in a first flow direction through the heat exchanger, and for periodically pumping said fluid in a reverse flow direction opposite the first flow direction to thereby change a temperature difference distribution status of the energy discharge device to enhance heat exchange efficiency and reduce accumulation of impurities or pollutants in the flow circuit as it passes through the heat exchanger of the energy discharge device, andfurther comprising at least one temperature detecting device arranged to detect a temperature variation of the fluid and to transmit detected temperature signals back to the periodic direction-change control device such that when a temperature of the energy discharging device reaches a preset temperature, the fluid pumping direction is operatively controlled to pump the fluid in reverse flow direction and change the temperature difference distribution status of the energy discharging device. 2. The single flow circuit as recited in claim 1, wherein said pumping device is a bidirectional pumping device in series with the energy discharge device driven by a power source and operatively controlled by a direction-change control device to periodically change direction. 3. The single flow circuit as recited in claim 2, wherein said bidirectional fluid pumping device is one of a (1) fluid pumping device arranged to produce positive pressure to push the fluid; (2) a fluid pumping device arranged to produce negative pressure to attract the fluid; and (3) a fluid pumping device capable of producing positive pressure to push the fluid and negative pressure to attract the fluid, said pumping device being driven by an electric motor supplied with electric power from the power source. 4. The single flow circuit as recited in claim 2, wherein said periodic direction-change control device includes electromechanical components, solid state electrical components, or microprocessors, software and operative control interfaces to operatively control the bidirectional fluid pumping device to have at least one of the following functions: (1) periodically changing the pumping direction of the pumping device to change the flow direction; (2) controlling the flow rate of fluid pumped by the pumping device to modulate a temperature of heat exchanger; and (3) mixed operative control of the pumping device to periodically change the pumping direction and control the flow rate. 5. The single flow circuit as recited in claim 1, wherein said pumping device includes two unidirectional fluid pumps, one of which causes the fluid to flow in the first flow direction and the other of which causes the fluid to flow in the reverse flow direction, said two unidirectional fluid pumps being alternately driven by a direction-change control device to periodically change a fluid pumping direction. 6. The single flow circuit as recited in claim 5, wherein if at least one of the unidirectional pumping devices is irreversible, said single flow circuit further comprises at least one unidirectional valve respectively connected in parallel with the at least one unidirectional pumping device that is irreversible. 7. The single flow circuit as recited in claim 5, wherein the unidirectional pumping devices are installed in series in a middle section of the energy discharging device. 8. The single flow circuit as recited in claim 7, wherein if at least one of the unidirectional pumping devices is irreversible, said single flow circuit further comprises at least one unidirectional valve respectively connected in parallel with the at least one unidirectional pumping device that is irreversible. 9. The single flow circuit as recited in claim 5, wherein the unidirectional pumping devices are installed in parallel in a middle section of the energy discharging device. 10. The single flow circuit as recited in claim 9, wherein if at least one of the unidirectional pumping devices is irreversible, said single flow circuit further comprises at least one unidirectional valve respectively series-connected with the irreversible universal pumping device and connected in parallel with the other unidirectional pumping device. 11. The single flow circuit as recited in claim 5, wherein a pair of the unidirectional pumping devices are installed in series at each end of the energy discharging device. 12. The single flow circuit as recited in claim 11, wherein if at least one of the unidirectional pumping devices is irreversible, said single flow circuit further comprises at least one unidirectional valve respectively connected in parallel with the at least one unidirectional pumping device that is irreversible. 13. The single flow circuit as recited in claim 5, wherein the unidirectional pumping devices are installed in parallel at each end of the energy discharging device. 14. The single flow circuit as recited in claim 13, wherein if at least one of the unidirectional pumping devices is irreversible, said single flow circuit further comprises at least one unidirectional valve respectively series-connected with the irreversible universal pumping device and connected in parallel with the other unidirectional pumping device. 15. The single flow circuit as recited in claim 1, wherein the pumping device comprises at least one unidirectional fluid pump and four controllable switch type fluid valves connected in a bridge arrangement, pairs of said fluid valves being alternately opened and closed to change said fluid flow direction. 16. The single flow circuit as recited in claim 15, wherein said bridge arrangement is located in a middle of said energy discharge device. 17. The single flow circuit as recited in claim 15, wherein one said bridge arrangement is located at each end of the fluid flow path through the energy discharge device. 18. The single flow circuit as recited in claim 1, wherein the energy discharge device has one of a tubular structure and a structure including more than one said heat exchanger. 19. The single flow circuit as recited in claim 1, wherein a direction-change control device controls a direction of fluid flow and, in addition, at least one of a rotational speed, flow rate, and fluid pressure of the pumping device. 20. The single flow circuit as recited in claim 1, wherein a direction-change control device is arranged to decrease or increase the flow rate of the fluid over a predetermined period when changing flow direction in order to mitigate an impact of the direction change on the energy discharge device. 21. A single flow circuit, comprising: an energy discharge device arranged to absorb or dissipate heat for cooling or heating, said energy discharge device including a heat exchanger for exchange of energy with a fluid in the single flow circuit; andreversible pumping means consisting of a pumping device in series with the energy discharge device for pumping said fluid in a first flow direction through the heat exchanger, and for periodically pumping said fluid in a reverse flow direction opposite the first flow direction to thereby change a temperature difference distribution status of the energy discharge device to enhance heat exchange efficiency and reduce accumulation of impurities or pollutants in the flow circuit as the fluid passes through the heat exchanger of the energy discharge device,wherein the fluid pumping direction is manually controlled through the periodic direction-change control device, or operatively controlled by setting a time period for the direction change, and wherein the fluid passes through the energy discharging device from a first fluid port to a second fluid port, the fluid passing through said first fluid port increasing in temperature and the fluid passing through the second fluid port decreasing in temperature as the fluid is pumped in the first flow direction, and the fluid passing through said first fluid port decreasing in temperature and the fluid passing through the second fluid port increasing in temperature as the fluid is pumped in the second flow direction opposite to the first flow direction. 22. The single flow circuit as recited in claim 21, wherein said pumping device is a bidirectional pumping device in series with the energy discharge device driven by a power source and operatively controlled by a direction-change control device to periodically change direction. 23. A single flow circuit, comprising: an energy discharge device arranged to absorb or dissipate heat for cooling or heating, said energy discharge device including a heat exchanger for exchange of energy with a fluid;reversible pumping means including a pumping device in series with the energy discharge device for pumping said fluid in a first flow direction through the heat exchanger, said pumping device periodically pumping said fluid in a reverse flow direction opposite the first flow direction to thereby change a temperature difference distribution status of the energy discharge device to enhance heat exchange efficiency and reduce accumulation of impurities or pollutants in the flow circuit as the fluid passes through the heat exchanger of the energy discharge device,wherein the at least one temperature detecting device includes two temperature detecting devices installed near the respective first fluid port and second fluid port to detect a temperature difference between the first fluid port and the second fluid port and, based on an increasing temperature difference between the higher-temperature first fluid port and the lower-temperature second fluid port, transmit a temperature difference signal to the direction-change control device to cause the pumping device to change the fluid flow direction and lower a temperature of the first fluid port and increase a temperature of the second fluid port. 24. The single flow circuit as recited in claim 23, wherein said pumping device is a bidirectional pumping device in series with the energy discharge device driven by a power source and operatively controlled by a direction-change control device to periodically change direction. 25. The single flow circuit as recited in claim 21, wherein said pumping device includes two unidirectional fluid pumps, one of which causes the fluid to flow in the first flow direction and the other of which causes the fluid to flow in the reverse flow direction, said two unidirectional fluid pumps being alternately driven by a direction-change control device to periodically change a fluid pumping direction. 26. The single flow circuit as recited in claim 23, wherein said pumping device includes two unidirectional fluid pumps, one of which causes the fluid to flow in the first flow direction and the other of which causes the fluid to flow in the reverse flow direction, said two unidirectional fluid pumps being alternately driven by a direction-change control device to periodically change a fluid pumping direction.