An apparatus includes a flash tank, a first load, a second load, a first compressor, a second compressor, and an expansion valve. The flash tank stores a refrigerant. The first load uses the refrigerant from the flash tank to cool a space proximate the first load. The second load uses the refrigerant from the flash tank to cool a space proximate the second load. The first compressor compresses the refrigerant from the second load. The second compressor compresses a mixture of the refrigerant from the first load and the refrigerant from the first compressor. The expansion valve controls a flow of the refrigerant from the flash tank to the first load such that the flow of refrigerant to the first load is increased when a temperature of the mixture exceeds a threshold.

A refrigeration system includes a refrigeration circuit and a coolant circuit separate from the refrigeration circuit. The refrigerant circuit includes a gas cooler/condenser, a receiver, and an evaporator. The coolant circuit includes a heat exchanger configured to transfer heat from a refrigerant circulating within the refrigeration circuit into a coolant circulating within the coolant circuit, a heat sink configured to remove heat from the coolant circulating within the coolant circuit, and a magnetocaloric conditioning unit configured to transfer heat from the coolant within a first fluid conduit of the coolant circuit into the coolant within a second fluid conduit of the coolant circuit. The first fluid conduit connects an outlet of the heat exchanger to an inlet of the heat sink, whereas the second fluid conduit connects an outlet of the heat sink to an inlet of the heat exchanger.

A flood prevention system includes a first load, a second load, a third load, a fourth load, a first compressor, a first temperature sensor, a second temperature sensor, and a controller. The first, second, third, and fourth loads are configured to use a refrigerant to remove heat from a first, second, third, and fourth space, respectively, proximate to the first, second, third, and fourth load, respectively. The first compressor is configured to compress the refrigerant from the fourth load. The first temperature sensor is configured to detect a first temperature of the refrigerant from the first load, the second load, and the third load. The second temperature sensor is configured to detect a second temperature of the refrigerant from the first load, the second load, the third load, and the compressor. The controller is configured to trigger an alarm in response to certain conditions.

A thermal energy system comprising a first thermal system having a heating demand, and a heat source connection system coupled to the first thermal system, the heat source connection system being adapted to provide selective connection to a plurality of heat sources for heating the first thermal system, the heat source connection system comprising a first heat exchanger system coupled to a first remote heat source containing a working fluid and a second heat exchanger system adapted to be coupled to ambient air as a second heat source, a fluid loop interconnecting the first thermal system, the first heat exchanger system and the second heat exchanger system, at least one mechanism for selectively altering the order of the first heat exchanger system and the second heat exchanger system in relation to a fluid flow direction around the fluid loop, and a controller for actuating the at least one mechanism.

A refrigerated display case (20) having at least one unit composed of a plurality of wall assemblies, namely a bottom assembly (22.3), a rear wall assembly, and a top assembly (22.1), which delimit a cooling space at the bottom, the rear, and the top, and having a cooling unit (1) whose components include at least one evaporator (11), one condenser (13, 13), and one electric control unit (15). An environmentally friendly refrigerated display case (20) is achieved in that the cooling unit (1) includes at least two closed refrigerant circuits (10, 10), which convey propane as a refrigerant and are each provided with a compressor (12, 12), and in order to variably control the cooling output, at least one compressor (12, 12) is embodied with a speed regulation and at least one compressor (12, 12) is embodied for operation at a constant speed.

An apparatus includes a first compressor, a first load, a second compressor, a second load, and a heat exchanger. The first compressor compresses a first refrigerant. The first load uses the first refrigerant to remove heat from a space proximate the first load. The first load sends the first refrigerant to the first compressor. The second compressor compresses a second refrigerant. The second load uses the second refrigerant to remove heat from a space proximate the second load. The second load sends the second refrigerant to the second compressor. The heat exchanger receives the first refrigerant from the first compressor and receives the second refrigerant from the second compressor. The heat exchanger transfers heat from the first refrigerant to the second refrigerant. The heat exchanger discharges the first refrigerant to the first load and discharges the second refrigerant to the second compressor.

A transportation refrigeration system includes a compartment to be conditioned. A refrigeration circuit is associated with an enclosure including a compressor. A condenser and an expansion valve are upstream of a first evaporator and a second evaporator. The first evaporator is in parallel with the second evaporator. A first enclosure surrounds the first evaporator. The first enclosure includes a first refrigerant detection sensor in communication with a controller. A second enclosure surrounds the second evaporator. The second enclosure includes a second refrigeration detection sensor in communication with the controller.

A refrigeration system for a temperature-controlled storage device includes a refrigeration circuit, a cooling circuit, and a controller. The refrigeration circuit includes a compressor driven by a brushless DC motor operable at multiple different speeds, a first heat exchanger, an expansion device, and a cooling unit in fluid communication via a first working fluid. The cooling circuit includes a pump and a second heat exchanger in fluid communication with the first heat exchanger via a second working fluid such that the first heat exchanger is liquid-cooled by the second working fluid. The controller operates the brushless DC motor at multiple different speeds to accommodate multiple different thermal loads experienced by the refrigeration system. Each of the speeds corresponds to a different thermal load. The controller modulates the speed of the brushless DC motor to maintain a desired temperature of a temperature-controlled space within the temperature-controlled device.

A system includes a heat exchanger coupled to an air conditioning system, and a flash tank is coupled to refrigeration cases, and houses a first refrigerant. The system includes solenoid valves coupled to the flash tank, where the solenoid valves reduce a pressure of the first refrigerant flowing from the flash tank to the heat exchanger. The heat exchanger may be coupled to the solenoid valves, and the heat exchanger may be configured to receive an amount of the first refrigerant from the solenoid valves, receive a second refrigerant from the air conditioning system, where the second refrigerant is associated with an air conditioning load, and provide cooling to the second refrigerant, using the first refrigerant. Finally, the system includes a check valve coupled to the flash tank, where the check valve reduces a pressure of the first refrigerant flowing from the flash tank away from the solenoid valves.

An apparatus includes a first compressor, a first load, a second compressor, a second load, a first heat exchanger, and a second heat exchanger. The first compressor compresses a first refrigerant. The first load uses the first refrigerant to remove heat from a space proximate the first load. The first load sends the first refrigerant to the first compressor. The second compressor compresses a second refrigerant. The second load uses the second refrigerant to remove heat from a space proximate the second load. The second load sends the second refrigerant to the second compressor. The first heat exchanger receives the first refrigerant from the first compressor. The first heat exchanger transfers heat from the first refrigerant to a fluid. The second heat exchanger receives the second refrigerant from the second compressor. The second heat exchanger transfers heat from the fluid to the second refrigerant.