Disclosed is a two-stage heating geothermal system using geothermal energy. The two-stage heating geothermal system includes a geothermal heat exchanger, a geothermal heat pump, a booster heat pump, a bypass line, and a bypass line opening and closing valve. The operating efficiency of the two-stage heating geothermal system using geothermal energy is significantly improved. Hot water supply, auxiliary heating, and the like are controlled to be completely independent of main heating.

Disclosed is a two-stage heating geothermal system using geothermal energy. The two-stage heating geothermal system includes a geothermal heat exchanger, a geothermal heat pump, a booster heat pump, a bypass line, and a bypass line opening and closing valve. The operating efficiency of the two-stage heating geothermal system using geothermal energy is significantly improved. Hot water supply, auxiliary heating, and the like are controlled to be completely independent of main heating.

A thermodynamic device includes a first liquid container configured to maintain a first pressure during operation, the first liquid container being partially filled with a working fluid during operation, a second liquid container configured to maintain a second pressure during operation, the second pressure being higher than the first pressure, the second liquid container being partially filled with the working fluid during operation; and a compensation pipe permeable to the working fluid and including an inlet arranged within the second liquid container so as to define, during operation, a working fluid level within the second liquid container, and including an outlet arranged within the first liquid container so that working fluid can be transported from the inlet into the outlet, the inlet being arranged to be higher up than the outlet in the installation direction.

A thermodynamic device includes a first liquid container configured to maintain a first pressure during operation, the first liquid container being partially filled with a working fluid during operation, a second liquid container configured to maintain a second pressure during operation, the second pressure being higher than the first pressure, the second liquid container being partially filled with the working fluid during operation; and a compensation pipe permeable to the working fluid and including an inlet arranged within the second liquid container so as to define, during operation, a working fluid level within the second liquid container, and including an outlet arranged within the first liquid container so that working fluid can be transported from the inlet into the outlet, the inlet being arranged to be higher up than the outlet in the installation direction.

The present invention includes a heat exchanger reactive to external and internal temperatures for carrying a working fluid, including two pairs of nested pipes; each pair including one pipe with a channel portion and a stress relief portion and a second pipe with just a channel portion, one of said pipes enclosing the other with an interference fit and both pipes having different coefficients of thermal expansion. The first pair of pipes positioned co-axially with and encompassing the second pair. A fluid is positioned in the space defined by the inner surface of outer pair of pipes and the outer surface of inner pair of pipes. The two pipe pairs have positions responsive to the internal and external temperatures in which the space defined by pipe pairs is either minimized or maximized by expansion and contraction of the pipe pairs caused by differences in coefficients of thermal expansion.

A heat pump system includes a compressor, a four-way valve, an outdoor heat exchanger, a throttling device and an indoor heat exchanger connected in sequence to form a refrigerant main circuit. The outdoor heat exchanger includes at least one double-rowed heat exchanger. The heat pump system has a cooling mode and a heating mode, and further includes a switching unit. The switching unit is connected in the refrigerant main circuit, and switches a flow direction of a refrigerant, such that the refrigerant flows into the outdoor heat exchanger through one of the first heat exchanger and the second heat exchanger, and flows out of the outdoor heat exchanger through the other one of the first heat exchanger and the second heat exchanger both in the cooling mode and in the heating mode.

A heat exchanger having a plurality of first tubes and second tubes through which a refrigerant passes and which are lengthily formed up and down, each of the first and second tubes being spaced from each other and air flowing between the tubes; and a fin in contact with the first and second tubes, wherein the second tubes are spaced from each other and located at a slipstream of the first tubes in an air-flow direction, a first louver group having a plurality of louvers located between the first tubes and spaced from each other in the air-flow direction and a second louver group having a plurality of louvers located between the second tubes and spaced from each other in the air-flow direction are formed in the fin, wherein some of the louvers of the second louver group are longer toward the slipstream of the air-flow direction.

A heat exchanger having a plurality of first tubes and second tubes through which a refrigerant passes and which are lengthily formed up and down, each of the first and second tubes being spaced from each other and air flowing between the tubes; and a fin in contact with the first and second tubes, wherein the second tubes are spaced from each other and located at a slipstream of the first tubes in an air-flow direction, a first louver group having a plurality of louvers located between the first tubes and spaced from each other in the air-flow direction and a second louver group having a plurality of louvers located between the second tubes and spaced from each other in the air-flow direction are formed in the fin, wherein some of the louvers of the second louver group are longer toward the slipstream of the air-flow direction.

A heat pump, the heat pump having a first end and a second end and further comprising: a working fluid and a chamber to contain said working fluid, the chamber having a first end and a second end corresponding to the first and second ends of the pump, one wall of the chamber acting as a heat exchanger between the chamber and a first heat transfer medium and one wall of the chamber, which may or may not be the same wall as the first mentioned one wall, acting as a heat exchanger between the chamber and a second heat transfer medium. The first heat transfer medium is located at a position between the first end of the pump and an intermediate portion defined at a position between the first and second ends of the heat pump, the first heat transfer medium operationally has a temperature T at the end nearest the intermediate portion, and operationally has a temperature higher than temperature T at the end located nearest the first end of the pump. The second heat transfer medium is located at a position between the intermediate portion and the second end of the pump, and has a temperature T at the end nearest the intermediate portion in operation of the heat pump, and a temperature lower than T at the end nearest the second end of the pump in operation of the heat pump, the second heat transfer medium operationally has a lower average temperature than the first heat transfer medium. The chamber has at least one moveable wall, one said moveable wall being driven by an external energy source and being configured to adjust the volume of the chamber, and one said moveable wall, which may or may not be the same wall as the first mentioned one said movable wall, being arranged to be driven by an external energy source and being capable of adjusting the shape of the chamber while keeping the volume of the chamber constant. The driven movements of the at least one moveable wall producing a repeating cycle including the following phases: a first phase in which the volume of the chamber is decreased; a second phase in which the shape of the chamber can be altered without a change in chamber volume so that a greater volume of the working fluid is at the second end of the chamber than is at the first end of the chamber; a third phase in which the volume of the chamber is increased; and a fourth phase in which the shape of the chamber can be altered without a change in chamber volume so that a greater volume of the working fluid is at the first end of the chamber than is at the second end of the chamber; this cycle causing a net flow of heat into the first heat transfer medium from the working fluid, and causing a net flow of heat from the second heat transfer medium into th

A four-process cycle is disclosed for a Vuilleumier heat pump that has mechatronically-controlled displacers. Vuilleumier heat pumps that use a crank to drive the displacers have been previously developed. However, mechatronic controls provides a greater degree of freedom to control the displacers. The four-process cycle provides a higher coefficient of performance than prior cycles in the crank-driven Vuilleumier heat pump and those previously disclosed for a mechatronically-driven Vuilleumier heat pump. The four-process cycle can be drawn out to provide a low demand condition by causing both displacers to remain stationary for a period of time. The four processes in which one of the displacers is commanded to move are separated by periods of inactivity in which both displacers remain stationary.