Abstract: A refrigerant circuit includes a compressor operable to compress a refrigerant, an expansion valve, an outdoor heat exchanger, an indoor heat exchanger in a fresh air inlet to a conditioned space, a recovery heat exchanger in an extracted air outlet from the conditioned space, and a reversing valve operable to direct a direction of refrigerant flow between a cooling mode and a heating mode.

Abstract: A refrigerant circuit includes a compressor operable to compress a refrigerant, an expansion valve, an outdoor heat exchanger, an indoor heat exchanger in a fresh air inlet to a conditioned space, a recovery heat exchanger in an extracted air outlet from the conditioned space, and a reversing valve operable to direct a direction of refrigerant flow between a cooling mode and a heating mode.

Abstract: A system includes a first set of coils that receive coolant from a first coolant line and provide the coolant to a second coolant line. A second set of coils that receive coolant from a third coolant line and provide the coolant to a fourth coolant line. A first valve regulates flow of coolant between the first and third coolant line. A second valve regulates flow of coolant between the second and the fourth coolant lines. A third valve regulates flow of coolant between the fourth coolant line and a fifth coolant line coupled to a water evaporator and a three-way valve. The three-way valve regulates flow of coolant between the fifth coolant line, the third coolant line, and a coolant input line. A fourth valve regulates flow of coolant between the second coolant line and a water condenser. A controller adjusts the valves to operate in a high temperature mode.

Abstract: A system includes a first set of coils receive coolant from a first coolant line and provide the coolant to a second coolant line. A second set of coils receive coolant from a third coolant line and provide the coolant to a fourth coolant line. A first valve regulates flow of coolant between the first and third coolant line. A second valve regulates flow of coolant between the second and the fourth coolant lines. A third valve regulates flow of coolant between the fourth coolant line and a fifth coolant line coupled to a water evaporator and a three-way valve. The three-way valve regulates flow of coolant between the fifth coolant line, the third coolant line, and a coolant input line. A fourth valve regulates flow of coolant between the second coolant line and a water condenser. A controller adjusts the valves to operate in an intermediate temperature mode.

Abstract: A system includes a first set of coils that receive coolant from a first coolant line and provide the coolant to a second coolant line. A second set of coils that receive coolant from a third coolant line and provide the coolant to a fourth coolant line. A first valve regulates flow of coolant between the first and third coolant line. A second valve regulates flow of coolant between the second and the fourth coolant lines. A third valve regulates flow of coolant between the fourth coolant line and a fifth coolant line coupled to a water evaporator and a three-way valve. The three-way valve regulates flow of coolant between the fifth coolant line, the third coolant line, and a coolant input line. A fourth valve regulates flow of coolant between the second coolant line and a water condenser. A controller adjusts the valves to operate in a low temperature mode.

Abstract: A method of defrost operation optimization in a heat pump includes launching a heating mode after completion of a performed defrost operation, measuring, after launching the heating mode, a heat transfer capability, determining if the measured heat transfer capability is less than or equal to a predetermined heat transfer capability limit for a non-iced condition, and reinforcing a next defrost operation if the measured heat transfer capability is greater than the predetermined gap limit.

Abstract: A HVAC system having an indoor heat exchanger having a first refrigerant passage extending in a first direction and a second refrigerant extending in a second direction opposite from the first direction, a first refrigerant circuit comprising a first compressor, a first expansion valve, a first outdoor heat exchanger, the first refrigerant passage, and a first reversing valve operable to control a direction of first refrigerant in the first refrigerant circuit, and a second refrigerant circuit comprising a second compressor, a second expansion valve, a second outdoor heat exchanger, the second refrigerant passage, and a second reversing valve operable to control a direction of second refrigerant in the second refrigerant circuit.

Abstract: A refrigerant circuit includes a compressor operable to compress a refrigerant, an expansion valve, an outdoor heat exchanger, an indoor heat exchanger in a fresh air inlet to a conditioned space, a recovery heat exchanger in an extracted air outlet from the conditioned space, and a reversing valve operable to direct a direction of refrigerant flow between a cooling mode and a heating mode.

Abstract: The present application provides a heat exchanger for exchanging heat between a first fluid and a second fluid. The heat exchanger may include a number of fin plates and a number of tubes extending though the fin plates with the first fluid therein. The fin plates may include a number of louvers extending between the tubes such that the second fluid flows through the louvers.

Abstract: The present application provides a heat exchanger for exchanging heat between a first fluid and a second fluid. The heat exchanger may include a number of fin plates and a number of tubes extending though the fin plates with the first fluid therein. The fin plates may include a number of louvers extending between the tubes such that the second fluid flows through the louvers.

Abstract: The present application provides a heat exchanger for exchanging heat between a first fluid and a second fluid. The heat exchanger may include a number of fin plates and a number of tubes extending though the fin plates with the first fluid therein. The fin plates may include a number of louvers extending between the tubes such that the second fluid flows through the louvers.

Abstract: The invention concerns a metal fin for heat exchanger with tubes, comprising means for increasing heat transfers consisting of diverting conformations (10,11) each arranged upstream and downstream of an aperture (3) when considering the direction (F) of air flow, to force the air to pass either side of said aperture, the upstream (10) and downstream (11) diverting conformations of two superimposed apertures (3) belonging to one same column extending along a determined length so that they substantially rejoin at the plane of extension (P) of offset apertures. (Figure to be published: FIG. 2).

Abstract: The invention concerns a metal fin for heat exchanger with tubes, comprising means for increasing heat transfers consisting of diverting conformations (10,11) each arranged upstream and downstream of an aperture (3) when considering the direction (F) of air flow, to force the air to pass either side of said aperture, the upstream (10) and downstream (11) diverting conformations of two superimposed apertures (3) belonging to one same column extending along a determined length so that they substantially rejoin at the plane of extension (P) of offset apertures.

Abstract: The invention concerns a metal fin for heat exchanger with tubes, comprising means for increasing heat transfers consisting of diverting conformations (10,11) each arranged upstream and downstream of an aperture (3) when considering the direction (F) of air flow, to force the air to pass either side of said aperture, the upstream (10) and downstream (11) diverting conformations of two superimposed apertures (3) belonging to one same column extending along a determined length so that they substantially rejoin at the plane of extension (P) of offset apertures.

Abstract: The invention relates to a heat exchange device including at least one heat exchange wall (6) between the refrigerant fluid (3) and the fluid to be cooled (4) having on one side a so-called hot surface (7) in contact with the fluid to be cooled, and at least one mechanical system (10) antagonist to the deposition on the hot surface of the exchange wall, of a solid layer of the fluid to be cooled. According to the invention, the means antagonist to the deposition is formed with a friction means (11) including a planar surface extending parallel to the hot surface of the exchange wall and having a heat conductivity such that the ratio of the heat conductivities of said friction means on the hot surface is larger than or equal to 3, and the mechanical system (10) includes means for supporting the friction means, adapted so that the latter rubs on the hot surface of the exchange wall via its planar surface.