An air conditioner unit includes a refrigeration loop comprising an outdoor heat exchanger, an indoor heat exchanger, a compressor for circulating refrigerant, and an electronic expansion valve. A controller performs a first operating cycle of the air conditioner unit with the compressor at a first compressor speed and the electronic expansion valve in a first valve position, receives a command to perform a second operating cycle at a target compressor speed, determines that the target compressor speed of the second operating cycle corresponds to the first compressor speed, and initiates the second operating cycle with the electronic expansion valve positioned at the first valve position. The controller is further configured to determine that the first valve position is below a predetermined position threshold at an end of the first operating cycle and open the electronic expansion valve to the predetermined position threshold after the first operating cycle.

An air conditioner unit includes a refrigeration loop comprising an outdoor heat exchanger, an indoor heat exchanger, a compressor for circulating refrigerant, and an electronic expansion valve. A controller performs a first operating cycle of the air conditioner unit with the compressor at a first compressor speed and the electronic expansion valve in a first valve position, receives a command to perform a second operating cycle at a target compressor speed, determines that the target compressor speed of the second operating cycle corresponds to the first compressor speed, and initiates the second operating cycle with the electronic expansion valve positioned at the first valve position. The controller is further configured to determine that the first valve position is below a predetermined position threshold at an end of the first operating cycle and open the electronic expansion valve to the predetermined position threshold after the first operating cycle.

An air conditioner unit includes a refrigeration loop including a condenser and an evaporator, a compressor for circulating refrigerant, and an electronic expansion valve. A controller monitors an operating superheat of the refrigerant across the evaporator, identifies a superheat fault condition based on at least one of the operating superheat, a target valve position of the electronic expansion valve, or a compressor speed, stops the compressor in response to identifying the superheat fault condition, and initiates a calibration process of the electronic expansion valve.

An air conditioner unit includes a refrigeration loop including a condenser and an evaporator, a compressor for circulating refrigerant, and an electronic expansion valve. A controller monitors an operating superheat of the refrigerant across the evaporator, identifies a superheat fault condition based on at least one of the operating superheat, a target valve position of the electronic expansion valve, or a compressor speed, stops the compressor in response to identifying the superheat fault condition, and initiates a calibration process of the electronic expansion valve.

An air conditioner unit includes a refrigeration loop including an indoor heat exchanger and an outdoor heat exchanger, a compressor for circulating refrigerant, and an electronic expansion valve. A controller receives a command to perform an operating cycle at a target compressor speed, determines a starting position of the electronic expansion valve using a valve position equation that is a function of the target compressor speed, an indoor temperature, an outdoor temperature, and empirically determined constants, and initializes the operating cycle with the electronic expansion valve at the starting position.

An air conditioner unit includes a refrigeration loop including an indoor heat exchanger and an outdoor heat exchanger, a compressor for circulating refrigerant, and an electronic expansion valve. A controller receives a command to perform an operating cycle at a target compressor speed, determines a starting position of the electronic expansion valve using a valve position equation that is a function of the target compressor speed, an indoor temperature, an outdoor temperature, and empirically determined constants, and initializes the operating cycle with the electronic expansion valve at the starting position.

The invention relates to an electromagnetically actuatable expansion valve for a refrigerant, said valve comprising a valve body (1) with a bore (2), in which a substantially cylindrical valve slide (3) is arranged such that it can be displaced axially in order to connect a supply line (4) to a discharge line (5). According to the invention, the discharge line (5) is formed by a hollow cylinder (6) which is inserted in the bore (2) and the end of which facing the valve slide (3) forms a valve seat (7) that can be closed by means of a separate valve closure element (8).

A vapor compression system comprises a compressor, a condenser, an expansion device, e.g. in the form of an expansions valve, and an evaporator arranged along a refrigerant path. A method for operating the vapor compression system comprises the steps of: obtaining a superheat value being representative for the superheat of refrigerant entering the compressor; obtaining a subcooling value being representative for the subcooling of refrigerant entering the expansion device; and operating the expansion device on the basis of the obtained superheat value and on the basis of the obtained subcooling value. The subcooling value is taken into account when operating the expansion device, because variations in the subcooling value have significant influence on the refrigerating capacity of the evaporator at a given opening degree of the expansion device, thereby resulting in a more stable operation of the system. The system may further comprise an internal heat exchanger.

A method of operating an electronic expansion valve of a heating, ventilation, air conditioning and refrigeration system includes detecting superheat of an evaporator of the heating, ventilation, air conditioning and refrigeration system and calculating a derivative of evaporator superheat with respect to time. The derivative of evaporator superheat with respect to time is compared to a selected derivative range, and the electronic expansion valve is closed at a rapid closure step increment higher than a normal closure step increment if the derivative is within the selected derivative range.

A body part of a decompression device has a swirl space for swirling a refrigerant that flows from a refrigerant inlet, and a refrigerant outlet that is positioned on an extension line of a swirl center line of the refrigerant and functions as a throttle. Further, a passage cross-sectional area of the refrigerant inlet is configured to be smaller than a twelve-fold value of a passage cross-sectional size of the refrigerant outlet, such that a swirl speed of the refrigerant in the swirl space is increased so as to enable a decompression boiling of the refrigerant around the swirl center line. In such manner, a gas-liquid mixture phase refrigerant securely flows into the refrigerant outlet, and it restricts a fluctuation of a flow amount of the refrigerant flowing toward a downstream side without complicating a cycle structure.