A refrigeration system, comprising a compressor, a condenser, a throttle flow path, and an evaporator connected in sequence, wherein a non-adjustable main throttle element is disposed in the throttle flow path; and further comprising a bypass flow path, wherein the bypass flow path is connected to the throttle flow path respectively at the upstream and downstream of the main throttle element, and provided with an adjustable auxiliary throttle element thereon; a liquid level sensor, disposed upstream and/or downstream of the throttle flow path, and configured to detect the liquid level; and a controller, wherein the controller is configured to control the opening of the auxiliary throttle element according to a liquid level signal from the liquid level sensor.

A refrigeration system, comprising a compressor, a condenser, a throttle flow path, and an evaporator connected in sequence, wherein a non-adjustable main throttle element is disposed in the throttle flow path; and further comprising a bypass flow path, wherein the bypass flow path is connected to the throttle flow path respectively at the upstream and downstream of the main throttle element, and provided with an adjustable auxiliary throttle element thereon; a liquid level sensor, disposed upstream and/or downstream of the throttle flow path, and configured to detect the liquid level; and a controller, wherein the controller is configured to control the opening of the auxiliary throttle element according to a liquid level signal from the liquid level sensor.

Provided are an electric valve, a thermal management assembly, and an air conditioning system. The electric valve includes a valve body, a circuit board, and a sensor. The valve body has a passage, and the sensor is connected to the circuit board in at least one of an electric connection mode and a signal connection mode. The sensor is configured to detect at least one of a pressure or a temperature of a working medium in the passage. At least one of the valve body or a housing of the sensor includes a metal portion, and a reference ground of the circuit board is electrically connected directly or indirectly to the metal portion.

Provided are an electric valve, a thermal management assembly, and an air conditioning system. The electric valve includes a valve body, a circuit board, and a sensor. The valve body has a passage, and the sensor is connected to the circuit board in at least one of an electric connection mode and a signal connection mode. The sensor is configured to detect at least one of a pressure or a temperature of a working medium in the passage. At least one of the valve body or a housing of the sensor includes a metal portion, and a reference ground of the circuit board is electrically connected directly or indirectly to the metal portion.

A refrigeration system includes an evaporator, a condenser, a compressor, a capillary tube, and an expansion device. The compressor is configured to circulate a refrigerant between the evaporator and the condenser. The capillary tube is configured to receive the refrigerant from the condenser. The expansion device is configured to receive the refrigerant from the capillary tube and provide the refrigerant to the evaporator. The expansion device is adjustable to control a flow of the refrigerant through the capillary tube.

An air conditioner provided which has: a main refrigerant circuit including a compressor, a heat source side heat exchanger, a first expansion valve, and a utilization side heat exchanger and configured such that refrigerant flows in the main refrigerant circuit; a sub refrigerant circuit including a cooling member configured such that refrigerant branched from the main refrigerant circuit flows in the cooling member and configured such that refrigerant branched from the main refrigerant circuit flows in the sub refrigerant circuit; and a heat generator to be cooled by the cooling member, wherein a pipe in which part of refrigerant discharged from the compressor flows is connected to the cooling member of the sub refrigerant circuit.

The invention relates to a sensor arrangement for providing a sensor signal S indicative of a vapor quality X of a medium flowing within a conduit 38a. A sensor includes a heating element and a temperature sensing element is arranged in thermal contact with a wall of a horizontally arranged portion 38a of the conduit 34. Processing means are disposed to deliver a sensor signal S based on an output of the temperature sensing element 52. The sensor 40 includes a sensor body 46 made of a metal material. The heating element 48 and the temperature sensing element 52 are arranged in thermal contact with the sensor body 46. The invention further relates to a cooling system 10 including at least one evaporator 32 for evaporating an ammonia refrigerant, at least one compressor 12 arranged to compress the evaporated refrigerant, and at least one condenser 18 for condensing the compressed refrigerant, and at least one evaporator pump 30 for pumping the condensed refrigerant to the evaporator 32. A sensor arrangement 50 is arranged at a conduit 34 conducting the refrigerant from at least a portion of the evaporator 32.

An air conditioner allows refrigerant to circulate therethrough. The air conditioner includes a compressor, a first heat exchanger, a first expansion valve, a second heat exchanger, and a controller. The controller changes an opening degree of the first expansion valve by a first operation amount according to a temperature difference between a target temperature and the temperature of the refrigerant discharged by the compressor. The refrigerant circulates through the compressor, the first heat exchanger, the first expansion valve, and the second heat exchanger. A first ratio when a specific condition is satisfied is larger than a second ratio when the specific condition is not satisfied. The specific condition indicates that the degree of subcooling of the refrigerant flowing between the first heat exchanger and the first expansion valve is smaller than zero. The first and second ratios are each a ratio of the first operation amount to the temperature difference.

A method of detecting electrical failure in a refrigeration system is provided. The method includes determining whether a present superheat of the refrigeration system is between a maximum superheat and a minimum superheat for the refrigeration system, the maximum superheat and the minimum superheat defining a normal operating range. The method also includes detecting an electrical property of an expansion valve assembly of the refrigeration system responsive to the superheat being outside the normal operating range. The method further includes determining whether the expansion valve assembly as experienced an electrical failure based on at least the electrical property. A signal indicating that the expansion valve has experienced an electrical failure is generated based on a determination that the expansion valve assembly has experienced the electrical failure.

An EXV (electronic expansion valve) control system includes an EXV controller for controlling an EXV within the refrigerant loop of an HVAC system. The EXV controller implements a master control algorithm that includes a plurality of sub-control algorithms and an initial series of branching decision points to determine the current mode of operation and to execute select sub-control algorithms corresponding to the current mode of operation, while not executing the sub-control algorithms corresponding to the other modes of operation. The sub-control algorithms implement various combinations of PID (Proportional Integral Derivative) control and feed-forward control, the results of which can be mapped to specific control instructions for the EXV.