A method for controlling a vapour compression system (1) comprising an ejector (6) is disclosed. In the case that a pressure difference between a pressure prevailing in the receiver (7) and a pressure of refrigerant leaving the evaporator (9) decreases below a first lower threshold value, the pressure of refrigerant leaving the heat rejecting heat exchanger (5) is kept at a level which is slightly higher than the pressure level providing optimal COP. Thereby the ejector (6) can operate at lower ambient temperatures, and the energy efficiency of the vapour compression system (1) is improved.

In one embodiment, solar-thermal system is provided. The solar-thermal system comprises a generator component; an evaporator component; a heat pump ejector comprising a mixing chamber; said heat pump ejector coupled to the generator component and the evaporator component; wherein the generator component emits a vapor stream into said mixing chamber and the heat pump ejector is configured to extract a working fluid vapor from the evaporator component into said mixing chamber through entrainment thereby to form a mixed flow; and a condenser component configured to cool said mixed flow via a cooling loop.

In one embodiment, solar-thermal system is provided. The solar-thermal system comprises a generator component; an evaporator component; a heat pump ejector comprising a mixing chamber; said heat pump ejector coupled to the generator component and the evaporator component; wherein the generator component emits a vapor stream into said mixing chamber and the heat pump ejector is configured to extract a working fluid vapor from the evaporator component into said mixing chamber through entrainment thereby to form a mixed flow; and a condenser component configured to cool said mixed flow via a cooling loop.

The present invention relates to a method of preparing a gas coolant for the direct cooling of a unit operation under a fixed heat load from its normal operating temperature (e.g., 300 F. and above) to a lower temperature (e.g., below 100 F.) in order to allow for maintenance or other non-routine work to be carried out in said unit operation.

The present invention relates to a method of preparing a gas coolant for the direct cooling of a unit operation under a fixed heat load from its normal operating temperature (e.g., 300 F. and above) to a lower temperature (e.g., below 100 F.) in order to allow for maintenance or other non-routine work to be carried out in said unit operation.

A valve (9) for use in a vapour compression system (1) is disclosed. The valve (9) comprises a first inlet (13) arranged to be connected to a gaseous outlet (11) of a receiver (6), a second inlet (14) arranged to be connected to an outlet of an evaporator (8), a first outlet (15) arranged to be connected to an inlet of a compressor unit (2), a non-return valve arrangement (19) arranged to allow a fluid flow from the second inlet (14) towards the first outlet (15), but to prevent a fluid flow from the first outlet (15) towards the second inlet (14), and a control valve mechanism (20) arranged to control a fluid flow from the first inlet (13) towards the first outlet (15).

A valve (9) for use in a vapour compression system (1) is disclosed. The valve (9) comprises a first inlet (13) arranged to be connected to a gaseous outlet (11) of a receiver (6), a second inlet (14) arranged to be connected to an outlet of an evaporator (8), a first outlet (15) arranged to be connected to an inlet of a compressor unit (2), a non-return valve arrangement (19) arranged to allow a fluid flow from the second inlet (14) towards the first outlet (15), but to prevent a fluid flow from the first outlet (15) towards the second inlet (14), and a control valve mechanism (20) arranged to control a fluid flow from the first inlet (13) towards the first outlet (15).

A mixing portion that is formed in an area from a refrigerant injection port of a nozzle portion to an inlet section of a diffuser portion in an internal space of a body portion of an ejector, that mixes an injection refrigerant injected from the refrigerant injection port and a suction refrigerant suctioned from a refrigerant suction port is provided. A distance from the refrigerant injection port to the inlet section in the mixing portion is determined such that a flow velocity of the refrigerant flowing into the inlet section of the diffuser portion becomes lower than or equal to a two-phase sound velocity. A shock wave that is generated at a time that a mixed refrigerant is shifted from a supersonic velocity state to a subsonic velocity state is generated in the mixing portion.

A mixing portion that is formed in an area from a refrigerant injection port of a nozzle portion to an inlet section of a diffuser portion in an internal space of a body portion of an ejector, that mixes an injection refrigerant injected from the refrigerant injection port and a suction refrigerant suctioned from a refrigerant suction port is provided. A distance from the refrigerant injection port to the inlet section in the mixing portion is determined such that a flow velocity of the refrigerant flowing into the inlet section of the diffuser portion becomes lower than or equal to a two-phase sound velocity. A shock wave that is generated at a time that a mixed refrigerant is shifted from a supersonic velocity state to a subsonic velocity state is generated in the mixing portion.

An air conditioner includes a stainless steel pipe having one end connected to a compressor and the other end connected to a refrigeration cycle component to form a single pipe between the compressor and the refrigeration cycle component, the stainless steel pipe partially having a corrugated part to attenuate vibration transferred from the compressor to the refrigeration cycle component, wherein the corrugated part is integrally formed with the other portion of the stainless steel pipe as at least a portion of the stainless steel pipe is processed.