The present invention relates to a reversible air-conditioning circuit (1) comprising: •a main loop (A) comprising a compressor (3) and a water condenser (5) jointly connected to an auxiliary circuit, a first expansion device (7), an external evaporator-condenser (9), a second expansion device (15), and an evaporator (17), •a first bypass branch (B) comprising an internal condenser (13), the first bypass branch (B) connecting a first junction point (31) arranged downstream from the water condenser (5) to a second junction point (32) arranged upstream from the second expansion device (15), •a second bypass branch (C) connecting a third junction point (33) arranged downstream from the external evaporator-condenser (9) to a fourth junction point (34) arranged downstream from the evaporator (17), and •a third bypass branch (D) connecting a fifth junction point (35) arranged downstream from the third junction point (33) to a sixth junction point (36) arranged downstream from the first junction point (31).

Thermal management systems include an open circuit refrigeration system featuring a receiver configurable to store a refrigerant fluid, an evaporator configurable to extract heat from a heat load when the heat load contacts the evaporator, and an exhaust line, where the receiver, the evaporator, and the exhaust line are connected to form a refrigerant fluid flow path, and a first control device configurable to control a vapor quality of the refrigerant fluid at an outlet of the evaporator along the refrigerant fluid flow path.

An air conditioning system includes: outdoor and indoor heat exchangers; first, second, and third control valves, which block refrigerant flow when fully closed; and a pressure adjuster. The first and second control valves are disposed in a gas-side refrigerant flow path (GL) between the outdoor and indoor heat exchangers. The third control valve is disposed in a liquid-side refrigerant flow path (LL) between the outdoor and indoor heat exchangers. The pressure adjuster adjusts the pressure of refrigerant in an indoor-side refrigerant flow path (IL) between the first control valve and the second control valve or the third control valve and the indoor heat exchanger. The pressure adjuster includes a pressure adjusting valve that bypasses refrigerant in the indoor-side refrigerant flow path (IL) to an outdoor-side refrigerant flow path (OL) between the first control valve and the second control valve or the third control valve and the outdoor heat exchanger.

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.

A cooling device includes a plurality of evaporators thermally coupled to a plurality of heat generating devices, respectively, a condenser coupled to the plurality of evaporators through a gas-phase pipe, a first tank coupled to the condenser through a liquid-phase pipe and configured to store a refrigerant therein, a second tank disposed at a position higher than the plurality of evaporators and configured to store the refrigerant therein, a plurality of distribution pipes each through which a corresponding evaporator of the plurality of evaporators is coupled to the second tank, a pump coupled to the first tank and the second tank through coupling pipes, respectively, and a bypass pipe through which the second tank is coupled to one of the first tank and the liquid-phase pipe.

A heat exchanger includes first and second headers connected to end portions of heat transfer tubes. The second header includes a header pipe defining a flow space that communicates with the heat transfer tubes and, when the heat exchanger acts as an evaporator, allows refrigerant in a two-phase gas-liquid state to pass through the flow space into the heat transfer tubes. A bypass pipe is disposed between an entrance portion and the first header. The entrance portion has an entrance distance L between a connection end portion connected to a refrigerant pipe and a central axis of the bypass pipe. The entrance distance L of the entrance portion satisfies L≥5di, where di is an inner diameter of a flow space of the header pipe on an orthogonal plane orthogonal to a direction of refrigerant flow. The bypass pipe is inserted in the flow space of the entrance portion.

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 refrigerator comprises: a storage compartment, at least divided into a refrigerating compartment and a freezing compartment a first evaporator, arranged at a cooling compartment connected to the storage compartments through supply air ducts; a second evaporator, arranged inside the freezing compartment a switching valve, used to switch the flow of a refrigerant to a refrigerant channel connected to the second evaporator; a fan, used to enable cooled air in the first evaporator to flow from the cooling compartment to the storage compartments; a first air duct damper, inserted in the supply air duct connected to the refrigerating compartment and a second air duct damper, inserted in the supply air duct connected to the freezing compartment.