An air-conditioning system includes a heat-source device that includes a compressor and a heat-source-side heat exchanger, a relay device that includes a pump and an intermediate heat exchanger, and a plurality of indoor units that each include a load-side heat exchanger. The air-conditioning system includes a refrigerant circuit through which refrigerant circulates and a heat medium circuit through which a heat medium circulates. The air-conditioning system includes a flow rate detection unit configured to detect flow rate information associated with a flow rate of a heat medium that flows through each of the plurality of indoor units and a controller configured to control the compressor and the pump. The controller controls operation of at least either the compressor or the pump on the basis of the flow rate information detected by the flow rate detection unit.

A refrigeration system and method of operating a refrigeration system having a loop comprising a compressor, a condenser, an expansion device and an evaporator, with the compressor compressing a refrigerant gas thereby heating the gas to a hot gas and the condenser removing heat from the hot gas thereby transforming the hot gas to a liquid refrigerant. The compressor has an inlet receiving gas from the evaporator and an outlet supplying hot gas to the condenser. The expansion device expands the liquid refrigerant from the condenser to a liquid-gas in the evaporator thereby absorbing heat. A heat exchanger transfers heat from the liquid refrigerant supplied to the expansion device. This increases energy density of the refrigerant.

A refrigeration system, including: a compressor, a condenser, an economizer, a throttle valve, and an evaporator which are connected via a pipeline; and a pneumatic valve that includes a valve body and a drive gas phase refrigerant chamber, an gas phase refrigerant outlet of the economizer being connected to an interstage gas phase refrigerant inlet of the compressor via the valve body, and the drive gas phase refrigerant chamber being connected to a low pressure portion of the refrigeration system via a first gas phase refrigerant path, the lower pressure portion having a pressure lower than that in the economizer; wherein a first valve for controlling on/off of the first gas phase refrigerant path is disposed on the first gas phase refrigerant path. The refrigeration system can avoid liquid phase refrigerant accumulated in the economizer from entering the compressor during start to cause a liquid impact problem.

A heat exchange system, an air conditioning control system, and an air conditioning system control method. A control portion of the heat exchange system respectively adjusts the opening of electronic expansion valves, and controls the electronic expansion valves to store an initialisation state and position information before powering down so that the electronic expansion valves first perform initialisation state switching when next powering up, thereby reducing the risk of the electronic expansion valves being out of step, and saving system start-up time.

A refrigeration cycle apparatus according to the present invention, a controller is configured to cause a first operation mode and a second operation mode to be executed as operation modes of an air-sending fan. The first operation mode is an operation mode in which an operation of the air-sending fan is started based on a first manipulation performed on an operation unit and the air-sending fan is stopped based on a second manipulation performed on the operation unit. The second operation mode is an operation mode in which the operation of the air-sending fan is started when refrigerant is detected by a refrigerant detection unit, the air-sending fan is not stopped based on the second manipulation, the air-sending fan is stopped based on a third manipulation different from the second manipulation, and the operation of the air-sending fan is restarted based on a fourth manipulation different from the first manipulation.

A valve device is provided with a valve body driving member rotated by driving force from a drive source, and a valve body rotating in a circumferential direction integrally with the valve body driving member. Fitting parts fitted one another are formed in the lower surface of the valve body driving member and the upper surface of the valve body. The valve body has hole parts formed therethrough in the axial direction thereof. Groove parts that are flow channels linking from the outer peripheral surface of the valve body to the hole parts are formed in the upper surface of the valve body. The fitting parts and the groove parts on the valve body side have connecting parts that are portions where the fitting parts and the groove parts are formed continuously in the upper surface of the valve body without being separated by other elements constituting the valve body.

A method for controlling a vapour compression system in an energy efficient and stable manner, the vapour compression system (1) including at least two evaporator groups (5a, 5b, 5c), each evaporator group (5a, 5b, 5c) including an ejector unit (7a, 7b, 7c), at least one evaporator (9a, 9b, 9c) and a flow control device (8a, 8b, 8c) controlling a flow of refrigerant to the at least one evaporator (9a, 9b, 9c). For each evaporator group (5a, 5b, 5c) the outlet of the evaporator (9a, 9b, 9c) is connected to a secondary inlet (12a, 12b, 12c) of the corresponding ejector unit (7a, 7b, 7c).

A heat exchange system for a vehicle including a battery, an electric motor, and a transmission system is provided. The heat exchange system includes a heat pump, and a heat exchanger. The heat pump is used for air conditioning. The heat pump includes an electric compressor that compresses a refrigerant. The electric compressor is configured to be driven with electric power from the battery. The heat exchanger is configured to exchange heat between the refrigerant and lubricating oil that lubricates the transmission system.

An expansion valve using a shape memory alloy spring includes: a valve housing having a first refrigerant flow passage and a second refrigerant flow passage passing through both sides of the valve housing and an opening/closing adjuster receiving space along an opened upper portion of the valve housing; an opening/closing adjuster configured to enter the opening/closing adjuster receiving space and to adjust an opening/closing degree of a valve using a shape memory alloy spring exerting an elastic force at a memory temperature; and a valve cover sealing the opened upper portion of the valve housing.

In one embodiment, an HVAC system includes an indoor unit having a furnace, an outdoor heat pump unit having a compressor and an outdoor coil, a refrigerant line coupled to the indoor unit and the outdoor heat pump unit, and an EEV coupled to the refrigerant line. The HVAC system further includes one or more controllers operable to determine an occurrence of a first event, initiate a closure of the EEV, initiate operation of the compressor at a completion of the air conditioning cycle to pump down a refrigerant to the outdoor coil, and cease operation of the compressor when a low-pressure switch is tripped.