Daikin Europe Patente

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.

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Outdoor unit for a heat pump having a refrigerant circuit and methods for servicing an outdoor unit of a heat pump having a refrigerant circuit is provided. An outdoor unit (10) for a heat pump having a refrigerant circuit comprises of a casing (11) comprising a fan chamber (22) and a machine chamber (21) configured to accommodate components of the refrigerant circuit of the heat pump, a fan (50) accommodated in the fan chamber (22), the fan (50) having fan blades (55) rotatable about an axis of rotation (56), and a front panel (100) having at least one engaging member (110, 110A, 110B) for attaching the front panel (100) to the casing (11). The front panel (100) is attachable to the casing (11) in at least two positions, a first position and a second position. In the first position, the front panel (100) is attached to the casing (11) such that the fan blades (55) and at least a part of the machine chamber (21) are covered and in the second position, the front panel (100) is attached to the casing (11) such that at least a part of the fan blades (55) is covered and the machine chamber (21) is accessible.

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The present disclosure relates to a ceiling-mounted air conditioning indoor unit 1 for a heat pump comprising a refrigerant circuit, the indoor unit comprising: a casing 2 comprising an air inlet 2a and at least one air outlet 2b; a drain pan 3 in a bottom portion of the casing 2, the drain pan 3 having an first rim 3a and an second rim 3b; a heat exchanger 4 being part of the refrigerant circuit and arranged above the drain pan 3 so that water dropping from the heat exchanger 3 accumulates in the drain pan 3; a fan 5 accommodated in the casing 2 to draw air in the air inlet 2a through the heat exchanger 4 and out of the at least one air outlet 2b, a bell mouth 6 located at the air inlet 2a for guiding drawn in air to the fan 5, a refrigerant leakage detection sensor 7 for detecting refrigerant leaking from the refrigerant circuit, wherein the refrigerant leakage detection sensor 7 is positioned between an outer surface 8 of the second rim 3b of the drain pan 3 and an inner surface 9 of the bell mouth 6, wherein the outer surface 8 of the second rim 3b of the drain pan 3 and the inner surface 9 of the bell mouth 6 face each other.

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Heat source unit (2) for an air conditioner (1) comprising a refrigerant circuit, the heat source unit comprising an external housing (10) accommodating a compressor (3) to be connected to the refrigerant circuit; a heat source heat exchanger (5) to be connected to the refrigerant circuit and configured to exchange heat between a refrigerant circulating in the refrigerant circuit and a heat source (104); an electric box (30) having a top (31) and side walls (32 to 34), the electric box accommodating electrical components (36) to configured to control the air conditioner and having an air passage (37) comprising an air inlet (38) and an air outlet (39), an air flow (41) being induced through the air passage from the air inlet to the air outlet for cooling at least some of the electrical components, wherein a cooling heat exchanger (22) is accommodated in the external housing and to be connected to the refrigerant circuit, wherein the cooling heat exchanger (22) is arranged so as to be flown through by the air flow (41) and exchange heat between the refrigerant and the air flow (41), the cooling heat exchanger (22) being connected to a bypass line (24) branched from a liquid refrigerant line (25) and a gas suction line (26), wherein the bypass line (24) has a valve (20) upstream of the cooling heat exchanger, a controller (65) configured to control the valve (20), and a first temperature sensor (66) accommodated within the external housing (10), wherein the controller (65) is configured to control the valve (20) on the basis of a temperature measured by the first temperature sensor (66).

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Die Erfindung betrifft ein Heizsystem mit einem Speicherbehälter (10), der mit unter Umgebungsdruck stehendem Wärmespeichermedium (12) befüllt ist, einem in den Speicherbehälter (10) eintauchenden, nach unten offenen Tauchrohr (14), welches eine innere Tauchrohrzone (16) von einer umgebenden Speicherzone (18) trennt, einem in der Speicherzone (18) angeordneten Entnahmewärmetauscher (20) zur Erwärmung von durchlaufendem Brauchwasser unter Wärmeentnahme aus dem Wärmespeichermedium (12),einem in dem Tauchrohr (14) angeordneten Zusatzwärmetauscher (24), der in Wärmeleitkontakt mit dem in der Tauchrohrzone (16) befindlichen Wärmespeichermedium (12) steht und mit einem Heizpfad (34) verbindbar ist und einem Wärmeerzeuger (26) zum Erwärmen des Wärmespeichermediums. Erfindungsgemäß wird vorgeschlagen, dass der Wärmeerzeuger (26) durch eine Wärmepumpe (52) gebildet ist.

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