Abstract: An air-conditioning apparatus has at least one intermediate heat exchanger that exchanges heat between a refrigerant changing in two phases or a refrigerant in a supercritical state and a heat medium such as water and anti-freezing fluid different from the refrigerant, a refrigeration cycle in which a compressor, a heat-source side heat exchanger, at least one expansion valve, and a refrigerant-side channel of the intermediate heat exchanger are connected via a pipeline through which the refrigerant flows, and a heat-medium circulation circuit in which a heat-medium side channel of the intermediate heat exchanger, a pump, and a use-side heat exchanger are connected via a pipeline through which the heat medium flows, in which in the heat-medium circulation circuit, a fourth temperature sensor that detects a temperature of the heat-medium flowing out of the use-side heat exchanger is provided, and leakage of the heat medium from the heat-medium circulation circuit is detected on the basis of a change amount of

Abstract: A three-phase AC to DC converter includes a three-phase AC power supply, a three-phase rectifier bridge circuit that is connected to the three-phase AC power supply and includes rectifying devices which are connected in a bridge configuration, a three-phase full-bridge circuit that includes two serially-connected switching devices for each of three phases, the two serially-connected switching devices being connected at an output side of the three-phase rectifier bridge circuit, and includes reverse blocking diodes which are connected in parallel to the respective switching devices, a reactor that connects the three-phase full-bridge circuit to the three-phase AC power supply, a smoothing capacitor connected to an output side of the three-phase full-bridge circuit, DC voltage detection means that detects an output voltage, power supply phase detection means that detects a power supply phase of the three-phase AC power supply, and pulse width modulator that outputs PWM signals which control the switching device

Abstract: An air-conditioning apparatus includes refrigerating cycle systems each connecting a compressor for compressing a refrigerant, a refrigerant flow path switching device, a heat source side heat exchanger for exchanging heat for the refrigerant, an expansion device for adjusting the pressure of the refrigerant, and heat exchangers related to heat medium which exchanges heat between the refrigerant and heat medium different from the refrigerant, by piping so as to constitute refrigerant circuits; and heat medium side systems each connecting pumps for circulating the heat medium for the heat exchangers related to heat medium, use side heat exchangers for exchange heat between the heat medium and air of an air-conditioning target space and heat medium flow switching systems for switching the heat medium which passes through each heat exchangers related to heat medium to each use side heat exchanger, by piping so as to constitute a heat medium circulation circuit.

Abstract: To provide a refrigeration cycle apparatus that achieves load balancing (for example, the balance between the cooling load and the heating load, and the balance between the cooling load and the heating and hot water loads) to increase system COP and an information transfer method used in the refrigeration cycle apparatus. A refrigeration cycle apparatus operates a plurality of indoor units so that the thermal cooling load and the thermal heating load to be executed by the plurality of indoor unit are balanced.

Abstract: An air-conditioning apparatus includes a heat medium side device with plural pumps for circulating the heat medium related to the heating or the cooling of plural intermediate heat exchangers. Plural use side heat exchangers exchange heat between the heat medium and air. Plural flow path switching valves switch the flow path for supplying the heat medium related to a selected system among the heating media circulating in plural systems to each use side heat exchanger. A relay unit side control device controls the flow path switching valves so as to circulate the heat medium between the use side heat exchanger causing the heat medium to absorb the heat and the use side heat exchanger causing the heat medium to emit the preferentially set heat, when it is determined that it is impossible to perform the heating or the cooling of the heat medium by the intermediate heat exchanger.

Abstract: An information transfer system for a refrigeration air-conditioning apparatus in which one or more heat-source units for the refrigerating/air conditioning apparatus, one first relay unit, and one or more second relay units are connected by refrigerant piping, and the second relay units and one or more indoor units are connected by water piping, wherein communications are performed discretely between a pair of the heat-source unit and the first relay unit, a pair of the first relay unit and the second relay units, and a pair of the second relay units and the indoor units through transmission lines respectively.

Abstract: An air-conditioning apparatus has at least one intermediate heat exchanger that exchanges heat between a refrigerant changing in two phases or a refrigerant in a supercritical state and a heat medium such as water and anti-freezing fluid different from the refrigerant, a refrigeration cycle in which a compressor, a heat-source side heat exchanger, at least one expansion valve, and a refrigerant-side channel of the intermediate heat exchanger are connected via a pipeline through which the refrigerant flows, and a heat-medium circulation circuit in which a heat-medium side channel of the intermediate heat exchanger, a pump, and a use-side heat exchanger are connected via a pipeline through which the heat medium flows, in which in the heat-medium circulation circuit, a fourth temperature sensor that detects a temperature of the heat-medium flowing out of the use-side heat exchanger is provided, and leakage of the heat medium from the heat-medium circulation circuit is detected on the basis of a change amount of

Abstract: An air-conditioning apparatus is provided with a heat-source device that supplies a refrigerant, a relay unit that exchanges heat of a heat medium such as water or anti-freezing fluid supplied from the heat-source device in an intermediate heat exchanger and supplies the heat medium, an indoor unit that exchanges heat between a use side heat exchanger through which the heat medium supplied from the relay unit flows and indoor air and performs cooling or heating in the indoor space, a controller that controls operations of the heat-source device, the relay unit and the indoor unit, and a third temperature sensor that detects the temperature of the heat medium flowing through the use side heat exchanger, and if an abnormality in at least one of the heat-source device and the relay unit is detected, the controller continues the operation of the indoor unit while the temperature detected by the third temperature sensor remains within a first predetermined temperature range.

Abstract: An owner concludes with a facility maintenance company a contract for maintenance of electric facilities and an operation control monitor device installed in a building of the owner. The electric facility manufacturer gives the company permission to access the device from a terminal through the Internet as a communication network. The company receives continuous monitor data items of the electric facilities collected by the device. The manufacturer accesses the device from a terminal through the network and also receives the continuous monitor data items of the electric facilities.

Abstract: An owner (10) concludes with a facility maintenance company (20) a contract for maintenance of electric facilities (11) and an operation control monitor device (12) installed in a building of the owner (10). The electric facility manufacture (30) gives the company (20) a permission to access the device (12) from a terminal (21) through the Internet (40) as a communication network. The company (20) receives continuous monitor data items of the electric facilities (11) collected by the device (20). The manufacture (30) accesses the device (12) form a terminal (31) through the network (40) and also receives the continuous monitor data items of the electric facilities (11).

Abstract: An air conditioning system in which a single heat source unit (A) comprising a compressor (1), a four-way valve (2), a heat source unit side heat exchanger (3) and an accumulator (4) is connected to a plurality of indoor units (B, C, D) through a first and a second connection pipes (6, 7). Each indoor unit (B, C, D) comprises a suction air temperature detecting device (50) for detecting a suction air temperature of the indoor unit, an opening degree setting device for setting a minimum valve opening degree of the first flow rate controller 9 in accordance with the difference between the target temperature and the suction air temperature and a first valve opening degree control device (52) for controlling the valve opening degree of the first flow rate controller 9 at a predetermined rate to the minimum valve opening degree.

Abstract: An air conditioning system in which a single heat source unit (A) comprising a compressor (1), a four-way valve (2), a heat source unit side heat exchanger (3) and an accumulator (4) is connected to a plurality of indoor units (B, C, D) through a first and a second connection pipes (6, 7). Each indoor unit (B, C, D) comprises a suction air temperature detecting device (50) for detecting a suction air temperature of the indoor unit, an opening degree setting device for setting a minimum valve opening degree of the first flow rate controller 9 in accordance with the difference between the target temperature and the suction air temperature and a first valve opening degree control device (52) for controlling the valve opening degree of the first flow rate controller 9 at a predetermined rate to the minimum valve opening degree. A bypass system is further provided to enable an effective defrost operation.

Abstract: An air conditioning apparatus which includes a single heat source device and plural indoor units including indoor heat exchangers. Some of the indoor units include a fan for introducing outdoor air, while others include a fan for circulating indoor air. In addition, a controller is provided for controlling operation of one or more of the indoor units to carry out heating, cooling or ventilation in response to a determination of the operation of one or more other indoor units.

Abstract: An air conditioning system in which a single heat source unit (A) comprising a compressor (1), a four-way valve (2), a heat source unit side heat exchanger (3) and an accumulator (4) is connected to a plurality of indoor units (B, C, D) through a first and a second connection pipes (6, 7) Each indoor unit (B, C, D) comprises a suction air temperature detecting device (50) for detecting a suction air temperature of the indoor unit, an opening degree setting device for setting a minimum valve opening degree of the first flow rate controller 9 in accordance with the difference between the target temperature and the suction air temperature and a first valve opening degree control device (52) for controlling the valve opening degree of the first flow rate controller 9 at a predetermined rate to the minimum valve opening degree.

Abstract: An air conditioning apparatus comprising: a single heat source device including a compressor, a reversing valve, an outdoor heat exchanger and an accumulator; a plurality of indoor units including indoor heat exchangers and first flow controllers; a first main pipe and a second main pipe for connecting between the heat source device and the indoor units; a first branch joint which can selectively connect one end of the indoor heat exchanger of each indor unit to either one of the first main pipe and the second main pipe; a second branch joint which is connected to the other end of the indoor heat exchanger of each indoor unit through the first flow controllers, and which is also connected to the second main pipe through a second flow controller; the first branch joint and the second branch joint being connected together through the second flow controller; the second branch joint being connected to the first main pipe through a fourth flow controller; a junction device which includes the first branch joint, th

Abstract: An air conditioning system for multiple rooms, comprising:an outdoor unit including a variable delivery compressor, a four way reversing valve and an outdoor heat exchange unit;two main connecting pipes composed of a high pressure main pipe and a low pressure main pipe to connect between outdoors and indoors;a distribution controller which is connected to the main connecting pipes to divide them into a high pressure pipe, a low pressure pipe and a medium pressure pipe therein;a plurality of indoor units which include indoor heat exchangers, respectively, which are one end connected to the medium pressure pipe through electronic expansion valves, respectively, and which are the other end selectively connected to either one of the high pressure pipe and the low pressure pipe, respectively;detecting means for detecting either one of refrigerant temperatures and refrigerant pressures; andcontrol means for carrying out a predetermimed control based on such detection.

Abstract: An apparatus for detecting a magnetic field includes a magnetic core, an excitation current source unit, a magnetic flux detecting unit, and a current control source unit. The excitation current source unit includes a first excitation winding disposed around the core, an amplifier having an output coupled to the first excitation winding, and a subtractor for applying to the amplifier a first difference between a voltage corresponding to a supplied excitation current and a voltage corresponding to a current passing through the first excitation winding. The magnetic flux detecting unit includes a second excitation winding disposed around the core, a waveform shaping circuit for shaping the waveform of a voltage induced in the second excitation winding, a pulse generating circuit for outputting pulses in synchronism with the shape waveform voltage, and a sample-and-hold circuit for sampling and holding the voltage corresponding to the supplied excitation current.