Daikin Europe Patente

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Provided a safety system (700) comprising: a plurality of valve units (200) for a heat pump system, a connection structure (710), and a discharge structure (720, 730). Each valve unit has a liquid refrigerant pipe portion (311) with a liquid control valve (364), a gas refrigerant pipe portion (330) with a gas control valve (365), a casing (400) accommodating at least the above valves and formed with at least two openings (420, 430), and a refrigerant leakage detector (500) configured to detect an occurrence of a refrigerant leakage in an internal space of the casing. The connection structure connects the internal spaces of the casings via the openings. The discharge structure is connected to the connection structure or one of the casings and configured to discharge air from the internal space of the casing in which a refrigerant leakage has occurred.

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The present disclosure relates to a thermal storage unit 100 used for a refrigeration apparatus using CO₂ as refrigerant, including: a thermal storage 20 including a thermal storage material 21, particularly a phase changing material PCM, a thermal storage unit gas port 62 configured to communicate to a utilization-side heat exchanger 80A disposed outside the thermal storage unit 100, a first thermal storage unit fluid port 72 configured to communicate to the utilization-side heat exchanger 80A, a second thermal storage unit fluid port 32A configured to communicate to a heat-source-side heat exchanger 11, disposed outside the thermal storage unit 100, and a third thermal storage unit fluid port 52A configured to communicate to an expansion device 12 disposed outside the thermal storage unit 100, wherein the thermal storage unit 100 further includes: a first switching mechanism 31 communicating among the second thermal storage unit fluid port 32A, the third thermal storage fluid port 52A, the thermal storage unit gas port 62 and one side of the thermal storage 20, and a second switching mechanism 41 communicating among the first thermal storage unit fluid port 72, the third thermal storage unit fluid port 52A and the other side of the thermal storage 20. Moreover, the disclosure relates to a refrigerant circuit 1 for a refrigeration apparatus with a thermal storage, which is using CO₂ as refrigerant. Additionally, the disclosure relates to a heat exchange unit 200 that is particularly used for a refrigeration apparatus with a thermal storage, which uses CO₂ as refrigerant.

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The present disclosure relates to Refrigerant leakage detection sensor 1 for a heat pump, comprising: a sensor casing 2; a circuit board 3 enclosed by the sensor casing 2; and a gas sensor 4 mounted on the circuit board 3, the gas sensor 4 having a housing 5, a refrigerant reception area 6 at an end of the housing 5 allowing gaseous refrigerant to enter the housing 5 and a sensing element in the housing 5, wherein the housing 5 protrudes through an opening 7 in the sensor casing 2 so that the refrigerant reception area 6 is arranged outside the sensor casing 2 and the sensing element is positioned inside the sensor casing 2. Moreover, the disclosure relates to an air conditioning apparatus comprising such a refrigerant leakage detection sensor.

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Outdoor unit (10) for a heat pump comprising a refrigerant circuit, the outdoor unit (10) comprising a casing (11), a fan (50) accommodated in the casing, the fan (50) having fan blades (55) rotatable about an axis of rotation (56), a grille (100) covering the fan blades (55), characterized in that at least an outer surface (101) of the grille is outwardly curved; the grille (100) is divided into a first area (A1) and a second area (A2), the first area (A1) being defined so that the distance (D) between the fan blades (55) and the outer surface (101) of the grille (100) is not more than a first threshold, and the second area (A1) being defined so that the distance (D) between the fan blades (55) and the outer surface (101) of the grille (100) is larger than the first threshold, wherein openings (102) are formed in the first (A1) and second (A2) areas of the grille (100), a smallest dimension of each of the openings (102) in the first area (A1) perpendicular to the axis of rotation (56) of the fan blades (55) is not more than a second threshold and a smallest dimension of at least some of the openings (102) in the second area (A2) perpendicular to the axis of rotation (56) of the fan blades (55) is larger than the second threshold.

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Provided is an air conditioning system that enables outdoor air cooling operation to reduce electric power consumption. The air conditioning system includes a plurality of utilization units (12) divided at least into a first utilization unit (12A) belonging to a first group (G1) and a second utilization unit (12B) belonging to a second group (G2), and a ventilator (30) belonging to the first group (G1). In the first group (G1), the utilization unit (12) includes a heat exchanger (26) and a valve (25) to adjust a flow rate of a refrigerant flowing to the at least one heat exchanger (26). When, as to the first group (G1), an outdoor air condition is satisfied for outdoor air, which is air outside an air conditioning target space (Z), a controller (29 or 36) closes the valve (25) and causes the ventilator (30) to perform outdoor air cooling operation in the first group Gl.

The present disclosure relates to a heat pump (100) comprising a compressor (101) for compressing a refrigerant, a first heat exchanger (102), a main expansion mechanism (103) and a second heat exchanger (104) arranged in a refrigeration path (120); the compressor having a suction port (101a), a compression port (101c) and an injection port (101b); a gas injection valve (112) connected on a first side (112a) to the refrigeration path between the first heat exchanger and the main expansion mechanism and on a second side (112b) to the injection port of the compressor; a liquid injection valve (111) connected on a first side (111a) to the refrigeration path between the first heat exchanger and the main expansion mechanism and on a second side (111b) between the second heat exchanger and the suction port of the compressor; and a controller (130), the controller (130) being configured to operate the gas injection valve (112) to inject at least partly gaseous refrigerant into the compressor through the injection port, and to operate the liquid injection valve (111) to inject substantially liquid refrigerant into the compressor through the suction port of the compressor.

Provided is a method for monitoring an air-conditioner having a semi-conductor gas sensor, comprising: determining that a refrigerant leakage has occurred on condition that the detection value is equal to or greater than a first threshold when the fan is in operation (S1200, S1300, S2400); starting operation of the fan as a provisional operation if the detection value is equal to or greater than a second threshold when the fan is not in operation (S1200, S1400, S1800); stopping the provisional operation of the fan (S1800); determining that a refrigerant leakage has occurred on condition that the detection value is equal to or greater than a third threshold after stopping the provisional operation of the fan (S2100, S2400); and taking a predetermined action for outputting alarm information and/or limiting supply of refrigerant to the heat exchanger when a refrigerant leakage is determined to have occurred (S2400).

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The invention comprises a heat pump comprising a heat source heat exchanger, a compressor, a utilization side heat exchanger and an expansion valve connected by refrigerant piping; and a muffler having first and second ports and a pressure pulsation reducing space, the pressure pulsation reducing space being in fluid communication with at least the first port and the second port, wherein the first and second ports are respectively connected to the refrigerant piping, characterized in that a first centre axis of the first port and a second centre axis of the second port are oriented so that a flow direction of refrigerant flowing in the refrigerant piping changes at least once between the first port and the second port.

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Provided is a heat pump system (100) having a compressor (210), a liquid-side on-off valve (420), a gas-side on-off valve (460), and a controller (600). The controller is configured to perform a refrigerant recovery operation for recovering refrigerant from a utilization-side piping section (102) to a heatsource-side piping section (101) by operating the compressor while the liquid-side on-off valve is closed and the gas-side on-off valve is open, and control the system such that the gas-side on-off valve starts closing (S2100) when a predetermined valve-close condition is satisfied during the compressor is operating for recovering refrigerant, and such that the operation of the compressor for recovering refrigerant stops (S2400) after the closing of the gas-side on-off valve started.