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.

The invention belongs to the technical field of vending machines and provides a vending machine refrigeration module, including a compressor, an evaporator, a condenser controller and a temperature sensor. The temperature sensor feeds back a detected temperature value to the controller. The detected temperature value is compared with a set temperature value to automatically adjust the motor speed of the compressor, the fan speed of the evaporator, and the fan speed of the condenser. The refrigeration module provided by the invention can automatically adjust the rotation speed of the compressor motor, the evaporator fan and the condenser fan according to the temperature detected by the temperature sensor, thereby avoiding full speed operation and reducing energy consumption and avoiding energy waste, improving energy efficiency.

A method of mitigating refrigerant leaks within a refrigeration system that includes: detecting a leak of a refrigerant from a refrigeration system; closing a first valve to inhibit a fluid flow of the refrigerant between an evaporator and a condenser fluidly connected to the evaporator; and operating a compressor to direct another fluid flow of the refrigerant from the evaporator to the compressor.

A method for controlling a refrigerating system using a non-azeotropic mixed refrigerant is provided. The refrigerating system may include a first evaporator configured to supply cold air to a freezer compartment located upstream and a second evaporator configured to supply cold air to a refrigerating compartment located downstream, based on a flow direction of the non-azeotropic mixed refrigerant. The method may include a first operation comprising operating a compressor, a freezer compartment fan to blow air to the first evaporator, and a refrigerating compartment fan to blow air to the second evaporator; a second operation comprising when the freezer compartment reaches a target temperature or the refrigerating compartment reaches a target temperature, continuously operating the compressor, and stopping the freezer compartment fan or the refrigerating compartment fan corresponding to one of the freezer compartment or the refrigerating compartment that reaches the target temperature; and a third operation comprising when both the freezer compartment and the refrigerating compartment reach the target temperatures, turning off both of the refrigerating compartment fan and the freezer compartment fan and stopping the compressor.

A heat pump water heater can include a water tank and a refrigerant circuit that can be in fluid communication with an evaporator coil, a condenser coil, and a compressor. The heat pump water heater can include a fan configured to move air across the evaporator coil, a temperature sensor, and a controller. The controller can be configured to receive temperature data from the temperature sensor and, in response to the temperature data indicating a temperature less than a predetermined temperature threshold, output instructions for the compressor to deactivate and the fan to move air across the evaporator coil.

A refrigerator a duct arranged to partition an inner space of a storage chamber body into a storage chamber and an air flow channel, wherein the duct has an ejection hole defined therein; a roll-bond evaporator disposed in the air flow channel, wherein the roll-bond evaporator has a top and a bottom, a left end and a right end; a blowing fan configured to draw air from the storage chamber to blow the air into the air flow channel; and a defrost sensor closer to one of the top and bottom than the other of the top and the bottom, wherein said one is closer to the blowing fan than the other, wherein the sensor is closer to one of the left end and the right end than the other of the left end and the right end.

The present invention provides a system for detecting an amount of R-454b refrigerant in an air temperature controller using an R-454b refrigerant, and a method of installing a configuration of R-454b sensors in the air temperature controller using an R-454b refrigerant. The system includes an R-454b control board, a first R-454b sensor, and a second R-454b sensor. The first R-454b sensor and the second R-454b sensor are coupled in series and electrically coupled to the R-454b control board. Each of the first R-454b sensor and the second R-454b sensor include sensing components configured to detect the amount of R-454b refrigerant.

The invention relates to a method of determining a refrigerant or a composition of refrigerants in a refrigeration system (1) comprising an expansion valve (2), an evaporator (3), one or more evaporator fans (4), a condenser (5), one or more condenser fans (6) one or more temperature sensors (7), one or more pressure sensors (8), a compressor (9), and a controller (25) for controlling the refrigeration system (1), the controller (25) comprising a memory (26), the expansion valve (2), the evaporator (3) and the compressor (6) being fluidly interconnected in a refrigerant path (10) having refrigerant flowing therein, comprising the steps of: a) Running a test run and read out values from one or more of the sensors (7, 8); b) Determining a composition by the result of step a; and c) Adjusting the refrigeration system (1) in relation to the composition determined by step b. The invention further relates to a controller (25) for controlling a refrigeration system (1) and to a cooling machine in a reefer container.

An air-conditioning apparatus includes: a heat source unit that generates a heating energy or a cooling energy that is transferred to refrigerant; a heat-use unit that causes the refrigerant to transfer the heating energy or the cooling energy to a heat load through heat exchange between the refrigerant and the heat load; a plurality of return pipes arranged parallel to each other and connecting the heat source unit and the heat-use unit to allow the refrigerant to flow therein from the heat-use unit to the heat source unit; an opening and closing device provided at at least one of the return pipes to control a flow rate of refrigerant; and a controller that opens the opening and closing device in a cooling operation, and closes the opening and closing device in a heating operation.

An augmented heat transfer system can be used to control the humidity of adjacent conditioned spaces by selectively absorbing latent heat energy from a relatively warm space, such as a loading dock, and discharging this energy in the form of sensible heat to an adjacent relatively cold space, such as a freezer served by the loading dock. This transfer of sensible heat energy into the cold space induces a vapor compression system to remove sufficient moisture from the cold space to avoid uncontrolled precipitation. At the same time, the process of removing moisture/latent heat from the warm space can also be used to reduce humidity in the warm space via condensation on a cold evaporator. Therefore, in operations where the warm space and the cold space are both nominally sealed from ambient air, such as an indoor loading dock serving a freezer, the augmented heat transfer system can eliminate uncontrolled precipitation in the freezer while also mitigating moisture ingress to the freezer from the dock space.