Abstract: A refrigeration cycle apparatus operating with standard composition refrigerant that is a zeotropic refrigerant mixture containing at least first refrigerant and second refrigerant having a higher boiling point than the first refrigerant at the same pressure, the refrigeration cycle apparatus including a main circuit in which a compressor, a first heat exchanger, an expansion valve, and a second heat exchanger are sequentially connected, and a component separation circuit connected to the main circuit, the first refrigerant having a property of disproportionation, the component separation circuit being configured to separate and store, from the main circuit, mixed refrigerant containing the first refrigerant having a higher composition ratio than in the standard composition refrigerant in an operation of a separation-storage mode separating the components of the standard composition refrigerant.

Abstract: A heat pump capable of operating in a high COP state even if influx temperature of a medium to be heated flowing into the radiators has increased. The heat pump includes a compressor, a first radiator, a second radiator, an expansion valve, and an evaporator sequentially connected by refrigerant piping to form a first refrigeration cycle, in which a first refrigerant circulates in the first refrigeration cycle, and in which the first radiator and the second radiator are serially connected. A first heat exchange unit that heats the first refrigerant is provided in a refrigerant piping at a refrigerant inlet side of the second radiator, and a second heat exchange unit that cools the first refrigerant is provided in a refrigerant piping at a refrigerant outlet side of the second radiator.

Abstract: A refrigeration cycle is configured by connecting a compressor, a four-way valve, a heat source side heat exchanger, expansion valves, and intermediate heat exchangers by piping. A heat medium circulation circuit is configured by connecting intermediate heat exchangers, pumps, and use side heat exchangers by piping. The outdoor unit accommodates the compressor, the four-way valve, and the heat source side heat exchanger, and the relay unit that is installed in a non-subject space which is different from an indoor space and is on an installation floor separated by two or more floors and accommodates the expansion valves, the pump, and intermediate heat exchangers are connected by two pipelines. The relay unit and an indoor unit that accommodates use side heat exchangers and is installed at a position where an indoor space can be air-conditioned are connected by two pipelines.

Abstract: A refrigeration cycle apparatus in which working refrigerant is a zeotropic refrigerant mixture containing at least a first refrigerant and a second refrigerant having a higher boiling point than the first refrigerant at the same pressure, the refrigeration cycle apparatus including at least a main passage in which a compressor, a first heat exchanger, a first expansion valve, and a second heat exchanger are sequentially connected, the first refrigerant having a property of disproportionation, the first refrigerant having a smaller composition ratio in the compressor than a composition ratio of the first refrigerant passing through the main passage.

Abstract: An air-conditioning apparatus has a controller that sets the target value of a difference between the temperatures of a secondary-side heat transfer medium at positions before and after a plurality of use side heat exchangers during a rated operation in a heating operation so as to have a larger magnitude than a target value of the difference between the temperatures of the secondary-side heat transfer medium at positions before and after the plurality of use side heat exchangers during a rated operation in the cooling operation.

Abstract: An air-conditioning apparatus in which a heat source unit and a relay unit are connected by two pipings, and in which a hot water supply function can be readily added. The relay unit includes a connection circuit between a first branching unit and a second connecting piping that is capable of connecting a water heat exchanger that exchanges heat between a refrigerant and water.

Abstract: A refrigerating and air-conditioning apparatus, which includes a compressor, a condenser, an expansion device, and an evaporator, has a refrigeration cycle configured by these components being connected by a refrigerant pipe, and uses a non-azeotropic refrigerant mixture as a refrigerant circulating through the refrigeration cycle, includes operating state detection means which detect a pressure of the refrigerant at the compressor, a temperature of the refrigerant at the compressor, and a rotation speed of the compressor, output detection means which detects an output of the compressor, and composition detection means which calculates a correlation between the pressure of the refrigerant at the compressor, the temperature of the refrigerant at the compressor, the rotation speed of the compressor, the output of the compressor, and a refrigerant composition and retains data indicating the correlation.

Abstract: An accumulator includes a container, a low pressure refrigerant inlet tube, and a low pressure refrigerant outlet body including an upstream-side tubular section, a low pressure refrigerant turning back section and a downstream-side tubular section in the container. At least a part of the upstream-side tubular section is covered by a first outer tube with a gap between the upstream-side tubular section and the first outer tube, at least a part of the downstream-side tubular section is covered by a second outer tube with a gap between the downstream-side tubular section and the second outer tube, the first outer tube and the second outer tube communicate with each other via a bridging tube, and high pressure refrigerant passes through the gap between the upstream-side tubular section and the first outer tube, the bridging tube, and the gap between the downstream-side tubular section and the second outer tube.

Abstract: An air-conditioning apparatus has a controller that sets the target value of a difference between the temperatures of a secondary-side heat transfer medium at positions before and after a plurality of use side heat exchangers during a rated operation in a heating operation so as to have a larger magnitude than a target value of the difference between the temperatures of the secondary-side heat transfer medium at positions before and after the plurality of use side heat exchangers during a rated operation in the cooling operation.

Abstract: A refrigeration cycle apparatus includes connected in series a compressor, an oil separator, a condenser, an expansion valve, and an evaporator, and comprising: a distributor communicating to the oil separator and configured to branch a flow of refrigerating machine oil separated within the oil separator; a first oil return flow path to cause the flow of the refrigerating machine oil branched by the distributor to flow into a suction side of the compressor, the first oil return flow path including an expansion valve; and a second oil return flow path to cause the flow of the refrigerating machine oil branched by the distributor to flow into the suction side of the compressor, the second oil return flow path including an oil tank accumulating refrigerating machine oil and a valve provided between the oil tank and the suction side of the compressor, the distributor having a distributor main body in which an inflow opening port communicating to the oil separator, a first oil return opening port communicating to

Abstract: In a refrigeration cycle device, a design volume ratio, obtained by dividing a stroke volume of a sub-compressor by a stroke volume of an expander, is set to be smaller than (DE/DC)×(hE?hF)/(hB?hA). With an operating efficiency being the maximum in an operating range allowed to be set of the refrigeration cycle device, DE is a density of a refrigerant, which has flowed out from a radiator, DC is a density of the refrigerant, which has flowed out from an evaporator, hE is a specific enthalpy of the refrigerant flowing into the expander, hF is a specific enthalpy of the refrigerant, which has flowed out from the expander, hA is a specific enthalpy of the refrigerant sucked by a main compressor, and hB is a specific enthalpy of the refrigerant at an intermediate position of a compression process of the main compressor.

Abstract: An air-conditioning apparatus capable of achieving enhancement of the system COP while suppressing product cost. The air-conditioning apparatus controls the difference between the temperatures of brine at a position before and at a position after an indoor heat exchanger or at a position before and at a position after an intermediate heat exchanger to be a preset target value and to be larger at the time of a heating operation than at the time of a cooling operation.

Abstract: An air-conditioning apparatus in which entry of a refrigerant into a living space is suppressed and measures against refrigerant leakage are taken is provided.

Abstract: A refrigeration cycle apparatus includes a refrigeration cycle formed by a first compressor, a radiator, an expander that expands a refrigerant that has passed through the radiator, and an evaporator. A bypass piping has one end connected to a discharge piping of the expander and the other end connected to a suction piping of the first compressor. A pressure sensor and a temperature sensor detect the suction pressure and suction temperature of the expander as physical quantities of the refrigerant to be sucked into the expander. A bypass valve controls the flow rate of the refrigerant. A control device determines the appropriate discharge pressure of the expander on the basis of the suction pressure and suction temperature of the expander, and opens the bypass valve when the pressure at which the expander discharges the refrigerant is higher than the determined appropriate discharge pressure.

Abstract: A refrigeration cycle apparatus increases the cooling capacity even under overload conditions in a refrigeration cycle apparatus that uses a refrigerant which undergoes transition to a supercritical state and in which the high-pressure side enters a supercritical state. A refrigeration cycle apparatus adjusts a high-pressure-side pressure of a refrigerant flowing through a main refrigerant circuit by causing a controller to control an opening degree of a second expansion valve and a heat transfer area of a radiator.

Abstract: Use side heat exchangers, an intermediate heat exchanger that heats a heat medium flowing to the use side heat exchangers, an intermediate heat exchanger that cools the heat medium flowing to the use side heat exchangers, three-way valves that switch between a flow path connecting the intermediate heat exchanger to the use side heat exchangers and a flow path connecting the intermediate heat exchanger to the use side heat exchangers, and three-way valves and bypasses that control the flow rate of the heat medium flowing into the use side heat exchangers are included. When at least one of the use side heat exchangers is switched from a stop state to an operation state or switched to another operation mode, the flow rate of the heat medium flowing into this use side heat exchanger is suppressed, and a change in air output temperature in the use side heat exchangers other than this use side heat exchanger is suppressed.

Abstract: A refrigeration cycle is configured by connecting a compressor that compresses the refrigerant, a four-way valve that switches the circulation path of the refrigerant, a heat source side heat exchanger that exchanges heat, expansion valves that adjust the pressure of the refrigerant, and two or more intermediate heat exchangers that exchange heat between the refrigerant and the heat medium to heat and cool the heat medium, by piping. A heat medium circulation circuit is configured by connecting two or more intermediate heat exchangers, pumps that pressurize the heat medium, two or more use side heat exchangers that exchange heat between the heat medium and the air in the indoor space, and flow path switching valves that switch paths of the heated heat medium or the cooled heat medium to the use side heat exchangers, by piping.

Abstract: A refrigeration cycle apparatus achieves efficient operation by constantly recovering power in a wide operating range. The refrigeration cycle apparatus regulates a pressure of a high pressure side by changing either one or both of an opening degree of the intermediate-pressure bypass valve and an opening degree of the pre-expansion valve on the basis of a density ratio that is obtained from an inflow refrigerant density of the expander and an inflow refrigerant density of the sub-compressor in an actual operating state and a design volume ratio that has been expected at the time of design and that is obtained from a stroke volume of the sub-compressor, a stroke volume of the expander, and a ratio of a flow rate of the refrigerant flowing to the sub-compressor.

Abstract: In an air-conditioning apparatus that uses a refrigerant, which operates in a transcritical cycle, and refrigerating machine oil, which has low miscibility with the refrigerant, in a refrigerant circuit for a refrigeration cycle connected to a compressor, a radiator, an expansion mechanism, and an evaporator, the air-conditioning apparatus includes a flow regulating mechanism provided in the refrigerant circuit, and controller that controls the flow regulating mechanism. If a refrigerant flow velocity at an outlet side of the radiator is lower than a predetermined threshold value, the refrigerant flow velocity at the outlet side of the radiator is increased by the controller so that oil-return operation that returns the refrigerating machine oil discharged from the compressor to the compressor is performed for at least a predetermined time period.

Abstract: Disclosed is a positive displacement expander equipped with an expansion mechanism in which power is generated using fluid energy produced while a high-pressure fluid, supplied to a plurality of expansion chambers partitioned by an orbiting scroll or a rolling piston, is being expanded and decompressed. The expander includes a communicating pipe that allows each of the expansion chambers to communicate with an expander discharge side and an opening and closing device disposed on the communicating pipe. When supply of the high-pressure fluid is stopped, the opening and closing device is opened by the time when high and low pressures between each of the expansion chambers and the expander discharge side are equalized, thus stopping the orbiting scroll or the rolling piston at a predetermined position so that an expander obtains sufficient driving force when resuming.