A refrigeration system includes a compressor, a condenser, a heat transfer component, and a refrigerant loop arranged to allow a flow of a refrigerant fluid. The compressor, the condenser, and the heat transfer component are connected in the refrigerant loop. The system further includes a bypass path extending between an output side of the compressor in the refrigerant loop and an input side of the heat transfer component in the refrigerant loop. A bypass valve is connected in the bypass path. A control circuit is in communication with the bypass valve. The control circuit is configured to open the bypass valve to allow the refrigerant fluid to pass to the heat transfer component thereby increasing the refrigerant fluid provided to the heat transfer component and artificially increasing a load on the refrigeration system. Other examples refrigeration system and examples methods are also disclosed.

A transport refrigeration unit is provided and includes a compressor, a condenser, an expansion valve, an evaporator, piping fluidly coupling the compressor and the condenser, a fluid loop to produce heated fluid from an engine, which is configured to drive operations of the compressor, a heat exchanger disposed in the refrigeration cycle such that the heated fluid thermally interacts with refrigerant of the refrigeration cycle and a hot gas bypass valve to control a quantity of refrigerant removed from the piping.

A refrigeration cycle apparatus includes a refrigeration cycle circuit, a bypass flow path, a first valve provided in the refrigeration cycle circuit, a second valve provided at the bypass flow path, a first temperature sensor configured to detect a temperature of an indoor space, a second temperature sensor configured to detect a temperature of refrigerant on a liquid side of an indoor heat exchanger, and a notification part. The refrigeration cycle apparatus is able to operate in an operation state where the compressor operates, the indoor heat exchanger functions as an evaporator, and the first valve is open while the second valve is closed. In the operation state, the notification part issues notification of an abnormality of an electronic expansion valve or the first valve when a temperature detected by the second temperature sensor is higher than an evaporation temperature of refrigerant in the refrigeration cycle circuit.

An air-conditioning device includes: a compressor; an outdoor heat exchanger; an evaporating unit configured to evaporate refrigerant a heater unit configured to heat the air by using the heat of the refrigerant a liquid receiver arranged at the downstream side of the outdoor heat exchanger and a restrictor mechanism provided between the heater unit and the outdoor heat exchanger, wherein, in an operation state in which the flow of the refrigerant is restricted by the restrictor mechanism and heat is released in the heater unit, a first operation mode and a second operation mode are switched, the first operation mode being set such that the liquid-phase refrigerant is stored in the liquid receiver and the gaseous-phase refrigerant is guided to the compressor and the second operation mode being set such that the liquid-phase refrigerant stored in the liquid receiver is guided to the evaporating unit.

An object is to provide a mixed refrigerant that has desired properties as an alternative refrigerant for R410A. As a solution to achieve the object, a composition containing a refrigerant that contains difluoromethane (R32), carbon dioxide (CO.sub.2), pentafluoroethane (R125), 1,1,1,2-tetrafluoroethane (R134a), and 2,3,3,3-tetrafluoropropene (R1234yf) in a specific mixture ratio is provided.

The step of removing the reaction product includes a step of loading a dummy wafer on the loading table, a step of increasing the temperature of the loading table, and a step of removing the reaction product after increasing the temperature of the loading table. In the step of increasing the temperature of the loading table, the temperature of the loading table is increased by opening an expansion valve between an output terminal of a condenser and an input terminal of the heat exchange unit, inputting heat to the loading table, opening a flow dividing valve between an output terminal of a compressor and the input terminal of the heat exchange unit, and adjusting an opening degree of the flow dividing valve.

Versatile temperature control systems adaptable to many different applications employ different states and proportions of a pressurized dual phase medium in direct contact with a thermal load. In one aspect of the invention, thermal energy generated by pressurization of a gaseous medium is stored at a selected temperature level so that it is later readily accessible. In addition, in accordance with the invention temperature control of a two-phase medium can be exercised across selectable dynamic ranges and with different resolutions. In accordance with such features, the control can be exerted by varying the input flow rate of a mixture applied to a thermal load, or by controlling the back pressure of the flow through the thermal load. In accordance with another feature of the invention, substantial energy conservation can be effected by employing an ambient temperature evaporator configuration between the thermal load and the input to the compressor. This variant also utilizes the two-phase characteristics of the medium. Moreover, the system can be configured compactly utilizing a thermal reservoir for retaining thermal energy for special purposes. In a food processing system for providing a frozen product, for example, the thermal reservoir can be accessed to utilize the refrigerant itself in different operating modes, such as rapid heating and system cleansing. In the food processing application, target temperatures can be set and maintained on a platen which is to receive food ingredients using energy flows at two different enthalpies, to enable rapid freezing or temperature elevation.

A refrigerator includes a compressor, a condenser, an evaporator, switching valve, an ice-making device, a controller, and a first refrigerant pipe and a second refrigerant pipe connected between the condenser and the evaporator. The switching valve is configured to guide the refrigerant condensed in the condenser to the first refrigerant pipe or the second refrigerant pipe. The ice-making device allows the first refrigerant pipe to pass therethrough and configured to cool water stored in an ice-making tray. The controller is configured to control the switching valve to guide the refrigerant to the ice-making device through the first refrigerant pipe. In response to a temperature of the ice-making tray falling to a level lower than or equal to a reference temperature, the controller is configured to control the switching valve to prevent the refrigerant from being guided to the first refrigerant pipe and supply water to the ice-making tray.

Disclosed herein is a refrigerator. The refrigerator includes a storage compartment, an evaporator configured to cool the air in the storage compartment, a first heater provided in the vicinity of the evaporator, a tray provided to accommodate water, a refrigerant pipe provided in contact with the tray and configured to cool the tray, a second heater provided in the vicinity of the refrigerant pipe, a compressor configured to supply a compressed refrigerant to at least one of the evaporator or the refrigerant pipe, and a processor configured to start an operation of the second heater after starting an operation of the first heater, and configured to start an operation of the compressor after stopping the operation of the first heater and the second heater. Accordingly, it is possible to prevent ice from being agglomerated caused by the defrosting operation.

A vapor compression system including: a compressor having a compressor suction port and a compressor discharge port configured to circulate a working fluid through a flow circuit; a first heat exchanger operably coupled to the compressor discharge port; a second heat exchanger operably coupled to the compressor suction port; a heat recovery heat exchanger operably coupled to the first and second heat exchangers wherein the heat recovery heat exchanger is configured to: receive the working fluid in a first phase from the first heat exchanger; receive the working fluid in a second phase from the second heat exchanger; exchange heat between the working fluid in the first phase and the second phase; and a bypass valve positioned between the heat recovery heat exchanger discharge and the second heat exchanger and defining a first flow path and a second flow path.