A heat pump includes an electric motor driven by input electric power, a first compressor mechanically connected to the electric motor and compresses air, a first heat exchanger performing heat exchange between compressed air produced by the first compressor and water, and a first hot water outlet through which the water heated by heat exchange in the first heat exchanger is taken out. Thus, in the air refrigerant heat pump, it is possible to use only air and water to supply heating by applying part of compressed air energy storage technology to the heat pump.

Extra heat in a closed cycle power generation system, such as a reversible closed Brayton cycle system, may be dissipated between discharge and charge cycles. An extra cooling heat exchanger may be added on the discharge cycle and disposed between a cold side heat exchanger and a compressor inlet. Additionally or alternatively, a cold thermal storage medium passing through the cold side heat exchanger may be allowed to heat up to a higher temperature during the discharge cycle than is needed on input to the charge cycle and the excess heat then dissipated to the atmosphere.

The present disclosure relates to a novel method for operating and controlling a vapor-compression cycle. The method of the present disclosure provides that a turbine-based expander in a heat pump model can achieve greater COP benefit in cooling than heating. Further, phase separation and an evaporator bypass are implemented within the turbine-based expander. Phase separation leads to successful energy recovery and compressor superheat control.

A method and system for circulating combined cooling, heating and power with a jet cooling device. An outlet of a working medium pump which is used to pressurize liquid working medium is connected to an inlet of a heater. An outlet of the heater is connected to an inlet of an expansion component. An outlet of the expansion component is connected to an inlet of a cooler. An outlet of the cooler is connected to a primary inlet of a jetting device. Primary outlets of the jetting device are respectively connected to an inlet of the working medium pump and an inlet of a throttle valve. An outlet of the throttle valve is connected to an inlet of an evaporator. An outlet of the evaporator and a gaseous outlet of the jetting device are both connected to an inlet of a pressurization component.

A system for producing and storing electrical energy includes a thermally insulated chamber containing a first circuitry in which circulates a first working fluid, a hot source, a cold source, wherein the hot source is composed of a pure water ice slurry at 0 C., the cold source is composed of an ice slurry with a temperature lower than or equal to 40 C. and the system for producing/storing electrical energy further includes a second circuitry of working fluid for circulating a second working fluid between the hot source and a thermostat, wherein the second working fluid is circulated between said thermostat and the hot source by an auxiliary expansion valve and an auxiliary compressor.

The present disclosure relates to a heat pump system. The heat pump system removes heat generated during the generation of electric energy using a power generator and also performs heating using waste heat. Since an additional heat source is created in order to meet a heating requirement, heating control is effectively achieved, and electric power is produced so as to meet the demand of electric energy. When the power generator is likely to be over-cooled in the cold season, cooling of the power generator is stably performed by controlling the temperature and the flow rate of a cooling medium moving to the power generator.

Extra heat in a closed cycle power generation system, such as a reversible closed Brayton cycle system, may be dissipated between discharge and charge cycles. An extra cooling heat exchanger may be added on the discharge cycle and disposed between a cold side heat exchanger and a compressor inlet. Additionally or alternatively, a cold thermal storage medium passing through the cold side heat exchanger may be allowed to heat up to a higher temperature during the discharge cycle than is needed on input to the charge cycle and the excess heat then dissipated to the atmosphere.

A modified two-phase refrigeration cycle compresses a working fluid, condenses the working fluid into a saturated or supercooled liquid, expands the saturated or supercooled liquid into a two-phase fluid, and evaporates the two-phase working fluid. The modified two-phase refrigeration cycle reduces irreversibilities imposed by conventional refrigeration cycles and extracts energy from the working fluid during the expansion process. For instance, a system that employs the modified two-phase refrigeration cycle includes a two-phase expander to reduce irreversibilities during an expansion process and extract energy. In some instances, the system includes a two-phase compressor to compress two-phase fluids for varying loads and environmental conditions of the system.

A gas turbine engine has a compressor section, a combustor, and a turbine section. An associated fluid is to be cooled and an associated fluid is to be heated. A transcritical vapor cycle heats the fluid to be heated, and cools the fluid to be cooled. The transcritical vapor cycle includes a gas cooler in which the fluid to be heated is heated by a refrigerant in the transcritical vapor cycle. An evaporator heat exchanger at which the fluid to be cooled is cooled by the refrigerant in the transcritical vapor cycle. A compressor upstream of the gas cooler compresses the refrigerant to a pressure above a critical point for the refrigerant. An expansion device expands the refrigerant downstream of the gas cooler, with the evaporator heat exchanger being downstream of the expansion device, and such that the refrigerant passing through the gas cooler to heat the fluid to be heated is generally above the critical point.

A system is described herein for repurposing waste heat from a refrigeration cycle to improve the efficiency of the cycle and power electronic devices. The system may include a compressor, a turbine, an accumulator, a condenser, a throttle, and an evaporator. The accumulator may include a high-pressure chamber connected between the turbine and condenser, and a low-pressure chamber connected between the evaporator and the compressor. The high-pressure chamber may be segregated from the low-pressure chamber such that high-pressure refrigerant in the high-pressure chamber is prevented from mixing with low-pressure refrigerant in the low-pressure chamber. The high-pressure chamber and low-pressure chamber may be thermally coupled such that liquid refrigerant in the low-pressure chamber is vaporized by heat exchange with the high-pressure chamber. The turbine may power an electronic component of the refrigerator or may feed electricity back into a community grid power system.