For creating a storage unit comprising a container housing enclosing a storage volume for receiving freight and a gaseous medium surrounding said freight, said storage unit further comprising a tempering system provided with a tempering unit associated with said storage volume for maintaining a flow of said gaseous medium circulating in said storage volume and passing through said tempering unit in order to be maintained at a defined or set temperature, said tempering unit comprising an internal heat exchanger arranged in said flow of gaseous medium passing through said tempering unit, said tempering system being provided with a refrigerant circuit comprising said internal heat exchanger, an external heat exchanger exposed to ambient air surrounding said container housing which operates reliably and cost efficient under the aforementioned condition, as well as a compressor unit for compressing refrigerant, and said tempering system being further provided with an engine for driving said compressor unit in an independent power source mode and said tempering system being further provided with an electric motor/generator unit mechanically coupled to said compressor unit, and said compressor unit and said motor/generator unit being commonly driven by said engine in said independent power source mode.

The present disclosure relates to a heating ventilation and air conditioning (HVAC) system. The system includes a primary heat transfer loop configured to be disposed at least partially outside of a building, and the primary heat transfer loop includes a heat exchanger, a compressor configured to compress a refrigerant, where the refrigerant is reactive, a condenser configured to receive and condense the refrigerant, and an expansion device configured to reduce a temperature of the refrigerant. The system further includes a secondary heat transfer loop configured to circulate a two-phase fluid at least partially inside the building, wherein the two-phase fluid is less reactive than the refrigerant. The secondary heat transfer loop includes the heat exchanger, where the heat exchanger is configured to transfer energy from the two-phase fluid circulating in the secondary heat transfer loop to the refrigerant, and an evaporator configured to evaporate the two-phase fluid by exchanging energy with an air supply stream flowing across the evaporator.

An aircraft environmental control system (20) comprises a first heat exchanger (24) configured to exchange heat between air provided by a pressurised air source (13) and a working fluid of a closed cycle refrigeration system, and an air turbine (32) configured to receive cooled air from the first heat exchanger (24). The closed cycle refrigeration system comprises a closed cycle refrigeration system compressor (35) driven by the air turbine (32), a closed cycle refrigeration system expander (36), and a second heat exchanger (33) configured to exchange heat between working fluid of the closed cycle refrigeration system and air downstream of the air turbine (32). The air turbine drives a further load (39).

An aircraft environmental control system (20) comprises a first heat exchanger (24) configured to exchange heat between air provided by a pressurised air source (13), and a working fluid of a closed cycle waste heat recovery system, and an air turbine (32) configured to receive cooled air from the first heat exchanger (24). The closed cycle waste heat recovery system comprises a waste heat recovery compressor (35), a waste heat recovery turbine (31), and a second heat exchanger (33) configured to exchange heat between working fluid of the closed cycle waste heat recovery system and air downstream of the air turbine (31). The air turbine is configured to drive a load (39), and the waste heat recovery turbine (31) is configured to drive the waste heat recovery compressor (35).

A method of operating a refrigeration unit (22) of a transport refrigeration system (200) including the steps of: controlling, using a controller (30), a plurality of components of the refrigeration system, the controlling includes operating at least one of a prime mover (26) and a battery system (190); monitoring, using a location tracking device (175), a location of the transport refrigeration system; powering, using the prime mover, the refrigeration unit when the location is outside a selected location; deactivating the prime mover when the location is within the selected location; activating the battery system when the location is within the selected location; and powering, using the battery system, the refrigeration unit when the location is within the selected location.

The invention relates to a turbomachine device of the intercooled recuperated reheated gas turbine (IRReGT) type. The invention relates to applications for motor vehicles. The turbomachine device comprises a first turbocompressor (C1, T2), a second turbocompressor (C2, T1), two combustion chambers (CC1, CC2) or an exhaust line (EL), an intercooler (IC) and a heat exchanger (E1). The device is configured to implement a stream of fluid (F1) from the first compressor (C1) to the intercooler (IC), to the second compressor (C2), to the heat exchanger (E1), to the turbines (T1, T2). According to one aspect, the device comprises at least one vehicle interior air conditioning section comprising at least a means for producing cold (E1F, E2F) and/or heat (E1C) on the basis of said stream (F1).

In a gamma free-piston Stirling cooler driven by linear electric motors, a motor operating frequency for consuming minimum electric power is detected and a different motor operating frequency that delivers maximum thermal cooling power is detected. The frequencies are detected by varying the operating frequency in small steps while sensing (1) the motor power input to maintain a steady temperature or (2) the thermal cooling power of the Stirling cooler. A mode detection routine detects whether the appropriate freezer operation is the electric power minimization mode or the thermal cooling power maximization mode based upon the current thermal conditions in the freezer. When the freezer is sufficiently cold, the pistons of the Stirling cooler are driven at the minimum electric power consumption frequency. When the temperature is, or is likely to become, too warm, the pistons of the Stirling cooler are driven at the maximum thermal cooling power frequency.

A system comprising a cryogenic engine system and a refrigeration system, wherein the cryogenic engine system and the refrigeration system are mechanically and/or thermally coupled with each other. The refrigeration system is driven by the cryogenic engine system and the cryogenic engine system enhances cooling of the refrigeration system.

The present disclosure relates to a heating ventilation and air conditioning (HVAC) system. The system includes a primary heat transfer loop configured to be disposed at least partially outside of a building, and the primary heat transfer loop includes a heat exchanger, a compressor configured to compress a refrigerant, where the refrigerant is reactive, a condenser configured to receive and condense the refrigerant, and an expansion device configured to reduce a temperature of the refrigerant. The system further includes a secondary heat transfer loop configured to circulate a two-phase fluid at least partially inside the building, wherein the two-phase fluid is less reactive than the refrigerant. The secondary heat transfer loop includes the heat exchanger, where the heat exchanger is configured to transfer energy from the two-phase fluid circulating in the secondary heat transfer loop to the refrigerant, and an evaporator configured to evaporate the two-phase fluid by exchanging energy with an air supply stream flowing across the evaporator.

A turbo-compression cooling system includes a power cycle and a cooling cycle coupled one to the other. The power cycle implements a waste heat waste heat exchanger configured to evaporate a first working fluid and a turbine configured to receive the evaporated working fluid. The turbine is configured to rotate as the first working fluid expands to a lower pressure. A condenser condenses the first working fluid to a saturated liquid and a pump pumps the saturated liquid to the waste heat waste heat exchanger. The cooling cycle implements a compressor increasing the pressure of a second working fluid, a condenser condensing the second working fluid to a saturated liquid upon exiting the compressor, an expansion valve expanding the second working fluid to a lower pressure, and an evaporator rejecting heat from a circulating fluid to the second working fluid, thereby cooling the circulating fluid.