A refrigeration cycle device includes: a high-pressure side heat exchanger; a low-pressure side heat exchanger; a vehicle-mounted device that supplies heat to the heat medium; a heat-medium air heat exchanger that exchanges heat between the heat medium and air; a switching portion that switches between a state in which the heat medium circulates through the high-pressure side heat exchanger and a state in which the heat medium circulates through the low-pressure side heat exchanger with respect to each of the vehicle-mounted device and the heat-medium air heat exchanger; and a controller that drives the compressor, while controlling an operation of the switching portion to switch to a defrosting mode in which the heat medium circulates between the low-pressure side heat exchanger and the vehicle-mounted device, and the heat medium circulates between the high-pressure side heat exchanger and the heat-medium air heat exchanger, when defrosting of the heat-medium air heat exchanger is necessary.

A refrigeration system including an evaporator defining an evaporator envelope and positionable to condition an airflow, the evaporator including an airflow inlet, an airflow outlet, and one or more refrigerant coils. The refrigeration system also includes a pressure sensor that is positioned to detect an outlet air pressure at or adjacent the outlet, and positioned to detect one or both of an ambient air pressure and an inlet air pressure and to generate a signal indicative of the corresponding air pressure. A control system in operative communication with the pressure sensor to determine a pressure differential based on the signal indicative of the outlet air pressure and the signal indicative of the ambient air pressure or the inlet air pressure, the control system configured to selectively initiate a demand defrost of the evaporator based on the determined pressure differential.

The present invention provides a control method of a refrigerator, comprising: a first defrosting step of defrosting an evaporator and terminating the defrosting when the evaporator reaches a first temperature; a step of detecting pressure difference by means of a differential pressure sensor for measuring pressure difference between a first thru-hole, disposed between the evaporator and an inlet through which air flows in from a storage compartment, and a second thru-hole disposed between the evaporator and an outlet through which the air is discharged into the storage compartment; and a second defrosting step of additionally defrosting the evaporator if the measured pressure difference is greater than a configured pressure.

An air conditioner may include a first compressor that compresses a refrigerant; a second compressor that compresses the refrigerant; an indoor heat exchanger that performs heat exchange between the refrigerant and air; a first four-way valve having a port connected to the first compressor; a first outdoor heat exchanger connected to a port of the first four-way valve; a first valve connected to a port of the first four-way valve; a second four-way valve having a port connected to the second compressor; a second outdoor heat exchanger connected to a port of the second four-way valve; a second valve connected to a port of the second four-way valve; a first valve pipe that connects a port of the first four-way valve and a port of the second four-way valve; a second valve pipe that connects the first valve and the second valve; and a third four-way valve having a port connected to the first valve pipe, a port connected to the second valve pipe, a port connected to the first compressor and the second compressor, and a port connected to the indoor heat exchanger.

A method of operating a refrigeration system (20) includes operating the refrigeration system in refrigeration mode. A current access condition into a refrigerated cargo space (22) is detected. At least one heat exchanger (32) in the refrigerated cargo space (22) is directed into a defrost mode during the current access condition. The refrigeration system (20) is directed into a refrigeration mode when the current access condition is no longer detected.

A three-pipe multi-split system. The three-pipe multi-split system includes an outdoor unit, a plurality of indoor units, and a plurality of hydraulic modules connected respectively by air pipes, liquid pipes, and condensate water pipes. The outdoor unit includes a compressor, a high-pressure pressure sensor, an oil separator, a first switching device, a second switching device, a third switching device, a finned heat exchanger, a compressor heat dissipation module, a plate type heat exchanger, a first electronic expansion valve, a second electronic expansion valve, a filling needle valve, an air-liquid separator, a low-voltage switch, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve, a fifth electromagnetic valve, an outdoor unit fan, and an outdoor unit temperature detection subassembly; each indoor unit includes an indoor unit heat exchanger, a third electronic expansion valve, an indoor unit fan, and an indoor unit temperature detection subassembly.

A ventilation unit for a freezer chamber, with a conduit and at least one heating element, wherein in the conduit, at least in sections, an air-permeable filler material is disposed, as well as a freezer chamber with such a ventilation unit as well as methods for operating such ventilation unit.

A frost monitor for HVAC&R systems detects efficiency degradations indicative of coil icing or frosting conditions by modeling compressor input power. The model uses temperature and compressor input power parameter measurements to predict expected compressor input power parameter values. Efficiency degradations are detected by comparing compressor power or current as predicted by the model against measured power or current. Deviations of the measured power parameter values from the predicted power parameter values by a predefined threshold reflect efficiency degradations that may be due to ice or frost accumulation on system coils. Such efficiency degradations may then be used to initiate a defrost cycle in the system.

A cooling system is provided. The cooling system is associated with a dynamic nuclear polarization system and configured to cool a sample to a temperature suitable for dynamic nuclear polarization to be carried out on the sample while the sample is in the cooling system. The cooling system includes a cryogenic chamber that includes a cryogenic fluid. The cooling system also includes a removable sample sleeve insertable within a portion of the cryogenic chamber. The removable sample sleeve is configured to define a sample path for the sample within the cryogenic chamber that is isolated from other parts of the cooling system.

Method (100) for controlling the operation of a refrigerator (1) comprising: a cabinet (2) defining a refrigeration and/or freezing area; an isolating door (3) that opens and closes the refrigeration and/or freezing area of the cabinet (2); a door opening sensor (31); and a cooling system (5) configured to modify the temperature of the refrigeration and/or freezing area; the method (100) comprising the steps of: monitoring the opening and closing of the door (31) by means of the door opening sensor (31) during a determined period; generating (206) a door opening probability distribution (206a) at the time monitored in the previous step; and maintaining or modifying the operation of the cooling system (5) according to the door opening probability distribution (206a).