An air conditioning system including one or more supercooling heat exchangers, a supercooling expansion device, a temperature sensor, and a pressure sensor so as to accurately measure and control a current supercooling degree value of a fluid coolant flowing between a fluid pipe and a plurality of indoor devices.

A method for controlling an electronic expansion valve of a variable refrigerant flow air conditioning system is disclosed in the present disclosure. The method includes steps as follows: when the VRF air conditioning system operates in a primary heating mode, obtaining a degree of superheat of return air of a compressor, and performing a control on an opening degree of the first electronic expansion valve according to the degree of superheat of return air; judging the degree of superheat of return air and the opening degree of the electronic expansion valve of each refrigerating indoor machine in the plurality of indoor machines; and if the degree of superheat of return air is greater than a first preset degree of superheat and an opening degree of an electronic expansion valve in any refrigerating indoor machine reaches a maximum opening degree, obtaining a target medium pressure value by calculating a refrigerant volume of the refrigerating indoor machine reaching the maximum opening degree, and performing a medium pressure control on the first electronic expansion valve according to the target medium pressure value. According to the method, a reasonable distribution of the refrigerant volume of the refrigerating indoor machine and the outdoor heat exchanger is realized, and a situation of unstable system due to insufficient refrigerant volume in the refrigerating indoor machine is also effectively avoided. A VRF air conditioning system is further disclosed in the present disclosure.

An apparatus and method for cooling a computing system, comprising a plurality of electronic components, with a cooling system. The cooling system includes a closed loop for the two-phase coolant, wherein the two-phase coolant has a saturation temperature. The closed loop includes a valve fluidly connected between an outlet of a heat exchanger and an inlet of a plurality of evaporator structures configured to be thermally coupled to the plurality of electronic components, and a compressor fluidly connected between an outlet of the plurality of evaporator structures and an inlet of the heat exchanger. The apparatus and method for the cooling system are configured to monitor one or more system temperatures of the computing system and adjust an operation of at least one of the valve or the compressor to alter the saturation temperature based on the one or more system temperatures.

An air conditioner has a refrigerant circuit and a blower. A refrigerant flow path switching mechanism is configured to switch to a first switching state to allow refrigerant to flow through a reheater, a second expansion valve, and a cooler in this order in a refrigerant circuit. The refrigerant flow path switching mechanism is configured to switch to a second switching state to allow refrigerant to flow through the reheater, the second expansion valve, and the cooler in this order in the refrigerant circuit. The reheater and the cooler are configured to allow air blown by the blower to pass through the cooler and then pass through the reheater during either of the first switching state and the second switching state.

A control system and a control method, which can control an electronic expansion valve. The method comprises: acquiring a temperature signal of an electronic expansion valve outlet and a pressure signal of the electronic expansion valve outlet; determining a first current degree of superheat on the basis of the temperature signal of the electronic expansion valve outlet and the pressure signal of the electronic expansion valve outlet; and a processing unit controlling, according to the requirements of an upper computer or the requirements of a set condition, an electronic expansion value to operate one of a temperature control mode, a degree of superheat control mode and an opening control mode.

A dynamic receiver is included in parallel to an expander of a heating, ventilation, air conditioning, and refrigeration (HVACR) system. The dynamic receiver allows control of the refrigerant charge of the HVACR system to respond to different operating conditions. The dynamic receiver can be filled or emptied in response to the subcooling observed in the HVACR system compared to desired subcooling for various operating modes. The flow through an expander of the HVACR system can be controlled to account for the mass flow rate through an outlet valve of the dynamic receiver when the dynamic receiver is emptied, preventing or reducing instability or effects on system parameters such as the suction superheat.

An air-conditioning apparatus includes an injection pipe allowing a part of a refrigerant, as discharged from a compressing device, to flow into an intermediate portion of a compression stroke of the compressing device, and an injection internal heat exchanger that exchanges heat between a refrigerant stream that flows through the injection pipe and a refrigerant stream that flows into a heat-source-side heat exchanger after passing through an indoor unit.

A multi-split system includes an outdoor unit, a distribution device, and a plurality of indoor units. The distribution device includes a gas-liquid separator, a first heat exchange assembly, a first electronic expansion valve, a second heat exchange assembly, a second electronic expansion valve, a third electronic expansion valve connected in parallel with the second electronic expansion valve. When the flow rate of the refrigerant passing through the first electronic expansion valve is greater than a first preset value, the distribution device is configured to calculate a value of superheat degree according to the outlet temperature of the indoor heat exchanger of each cooling indoor unit and the temperature of the refrigerant flowing into the second heat exchange assembly, and to perform a PI control over the second electronic expansion valve and the third electronic expansion valve according to the value of superheat degree.

A method is for operating an expansion valve in a refrigerant circuit that includes a compressor, a condenser, the expansion valve, an evaporator, and a working fluid. The method includes determining a modified subcooling value based on a condenser working fluid discharge temperature, a condenser discharge subcooling setpoint, and one or more of a compressor discharge temperature and an evaporator approach temperature. The method also includes adjusting the expansion valve according to the modified subcooling value. A refrigerant circuit for a heating, ventilation, air conditioning, and refrigeration system includes a controller configured to operate the expansion valve according to a modified subcooling value.

Systems and methods for disrupting a flow of refrigerant within a heat exchanger assembly. One embodiment provides a method that includes receiving, with a controller, a first signal from a first sensor, the first signal indicative of a pressure of the refrigerant flowing through the heat exchanger. The method includes setting, with the controller, an operating frequency of a valve based on the first signal. The operating frequency includes a rate at which the valve actuates between a first valve position that sets a first refrigerant flow rate through the heat exchanger and a second valve position that sets a second refrigerant flow rate through the heat exchanger. The method includes controlling, with the controller, operation of a solenoid to actuate the valve at the operating frequency.