A combination water heating, air conditioning refrigerant system is described. The combined system includes a plurality of independently adjustable electronic expansion valves. The expansion valves can independently modulate the delivery of high-temperature, high-pressure refrigerant to either a water heat exchanger or an outside condenser. A controller can receive input signals, including temperature signals from one or more temperature sensors that indicate the temperature at various locations of the system. The temperature signals include one or more of water temperature signals, ambient air temperature signals, or refrigerant super heat temperatures signals. In response to the input signals, the controller can output control signals to one or more of the plurality of electronic expansion valves.

An air conditioning heat dissipation structure control method and a system includes the steps obtaining a real-time temperature Te of the heat generating component; if T.sub.e>T.sub.e.sup.d, opening the solenoid valve SV2 and adjusting the electronic expansion valve 4 to a preset initial opening degree; obtaining an update real-time temperature T.sub.e of the heat generating component after a setting time period; if the update real-time temperature T.sub.e>T.sub.max, performing the following steps every set period of time, obtaining a refrigerant temperature refrigerant temperature T.sub.in at the inlet end of the refrigerant heat dissipation pipe and a refrigerant temperature T.sub.out at the outlet end of the refrigerant heat dissipation pipe; calculating a real-time temperature difference ΔT.sub.real-time of the inlet end temperature T.sub.in and the outlet end temperature T.sub.out, wherein ΔT.sub.real-time=T.sub.out−T.sub.in, obtaining a preset target temperature difference ΔT.sub.target and calculating a deviation ΔT.sub.deviation, ΔT.sub.deviation=ΔT.sub.real-time−ΔT.sub.target; calculating a deviation change rate ΔΔT.sub.deviation=ΔT.sub.deviation−ΔT.sub.deviation′, and adjusting the opening degree of the electronic expansion valve based on the deviation ΔT.sub.deviation and the deviation change rate ΔΔT.sub.deviation, enables the temperature difference between the inlet end and the outlet end of the refrigerant heat dissipation pipe reaches the target temperature difference so as to ensure a good heat dissipation effect and keep the heat generating component working in a good condition and also lowers the cost by using refrigerant for transferring heat from the heat generating component. With the method, the reliability and stability of the air conditioning operation are improved, and the problem of poor heat dissipation reliability and high heat dissipation cost in the prior art is solved.

An air conditioning heat dissipation structure control method and a system includes the steps obtaining a real-time temperature Te of the heat generating component; if T.sub.e>T.sub.e.sup.d, opening the solenoid valve SV2 and adjusting the electronic expansion valve 4 to a preset initial opening degree; obtaining an update real-time temperature T.sub.e of the heat generating component after a setting time period; if the update real-time temperature T.sub.e>T.sub.max, performing the following steps every set period of time, obtaining a refrigerant temperature refrigerant temperature T.sub.in at the inlet end of the refrigerant heat dissipation pipe and a refrigerant temperature T.sub.out at the outlet end of the refrigerant heat dissipation pipe; calculating a real-time temperature difference ΔT.sub.real-time of the inlet end temperature T.sub.in and the outlet end temperature T.sub.out, wherein ΔT.sub.real-time=T.sub.out−T.sub.in, obtaining a preset target temperature difference ΔT.sub.target and calculating a deviation ΔT.sub.deviation, ΔT.sub.deviation=ΔT.sub.real-time−ΔT.sub.target; calculating a deviation change rate ΔΔT.sub.deviation=ΔT.sub.deviation−ΔT.sub.deviation′, and adjusting the opening degree of the electronic expansion valve based on the deviation ΔT.sub.deviation and the deviation change rate ΔΔT.sub.deviation, enables the temperature difference between the inlet end and the outlet end of the refrigerant heat dissipation pipe reaches the target temperature difference so as to ensure a good heat dissipation effect and keep the heat generating component working in a good condition and also lowers the cost by using refrigerant for transferring heat from the heat generating component. With the method, the reliability and stability of the air conditioning operation are improved, and the problem of poor heat dissipation reliability and high heat dissipation cost in the prior art is solved.

A metering device may automatically control fluid flow through a valve. A control system may alter the automatic control of a metering device. In some implementations, a predetermined event may occur to alter the automatic control of the metering device.

A metering device may automatically control fluid flow through a valve. A control system may alter the automatic control of a metering device. In some implementations, a predetermined event may occur to alter the automatic control of the metering device.

A heating, ventilation, and air conditioning (“HVAC”) system includes an evaporator coil and a compressor fluidly coupled to the evaporator coil via a suction line. A condenser coil is fluidly coupled to the compressor via a discharge line and fluidly coupled to a metering device via a liquid line. A charge compensator is fluidly coupled to the liquid line via a connection line. A charge compensator re-heat valve is disposed in the connection line.

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.

A metering device may automatically control fluid flow through a valve. A control system may alter the automatic control of a metering device. In some implementations, a predetermined event may occur to alter the automatic control of the metering device.

A metering device may automatically control fluid flow through a valve. A control system may alter the automatic control of a metering device. In some implementations, a predetermined event may occur to alter the automatic control of the metering device.

An air conditioning system can be toggled between a heating mode, in which heat is withdrawn from a source (e.g., a geothermal source) and deposited into a conditioned space (e.g., a building), and a cooling mode, in which heat is withdrawn from the conditioned space and deposited into the source. The air conditioning system uses a combination of efficiency-enhancing technologies, including injection of superheated vapor into the system's compressor from an economizer circuit, adjustable compressor speed, the use of one or coaxial heat exchangers and the use of electronic expansion valves that are continuously adjustable from a fully closed to various open positions. A controller may be used to control the system for optimal performance in both the heating and cooling modes, such as by disabling the economizer circuit and vapor injection when the system is in the cooling mode.