Abstract: Provided is a refrigeration apparatus capable of appropriately supplying oil separated by oil separators to compressors according to the situation. The refrigeration apparatus includes refrigeration units each including a compressor, an oil separator, an oil return pipe, and a heat dissipation heat exchanger; a pressure reducing valve connected to the heat dissipation heat exchangers; and an oil return control mechanism controlling a return destination of the oil separated by the oil separators. The oil return control mechanism includes an oil supply pipe connecting the oil return pipes; a flow control mechanism, controlling a flowing condition of oil in the oil supply pipe, disposed in the oil supply pipe; and an ejection control mechanism, controlling an ejection condition of oil ejected from the oil separator, disposed in each oil return pipe at a position closer to the oil separator than a connection position with the oil supply pipe is.

Abstract: Provided is a refrigeration apparatus capable of appropriately supplying oil separated by oil separators to compressors according to the situation. The refrigeration apparatus includes N refrigeration units each including a compressor, an oil separator, an oil return pipe, and a heat dissipation heat exchanger; N pressure reducing valves each connected to the heat dissipation heat exchanger of a corresponding one of the N refrigeration units; and an oil return control mechanism that controls a return destination of the oil separated by the oil separators of the N refrigeration units. The oil return control mechanism includes an oil supply pipe that connects the oil return pipes of the N refrigeration units to each other, and a flow control mechanism, which controls a flowing condition of oil in the oil supply pipe, disposed in the oil supply pipe.

Abstract: A thermal electric power generator includes an evaporator, an expander, an electric generator, a condenser, and a pump. A working fluid used in the thermal electric power generator is an organic working fluid. The evaporator includes a heat exchanger, a bypass channel, and a flow rate adjustment mechanism. The bypass channel allows a heat medium to bypass the heat exchanger. The flow rate adjustment mechanism adjusts a flow rate of the heat medium to be supplied to the heat exchanger and a flow rate of the heat medium to be supplied to the bypass channel.

Abstract: A combined heat and power system is provided with a Rankine cycle passage, a heat medium passage, an evaporator, an expander, a condenser, a pump, a temperature sensor, a sensor, and a controller. The evaporator receives the heat from the heat medium to heat a working fluid. The temperature sensor detects the temperature of the heat medium after radiating heat for heating the working fluid. The sensor detects the pressure of the working fluid flowing between the outlet of the evaporator and the inlet of the expander. The controller adjusts the rotation speed of the pump based on the temperature detected by the temperature sensor, and in addition, adjusts the rotation speed of the expander based on the pressure detected by the sensor.

Abstract: An evaporator which heats working fluid with high-temperature fluid to evaporate the working fluid includes: a working fluid channel arranged in a flow direction of the high temperature fluid and through which the working fluid flows; and a temperature sensor provided for the working fluid channel. A part of the working fluid channel is exposed to outside of a housing of the evaporator, and the temperature sensor is provided in the part of the working fluid channel exposed to the outside of the housing of the evaporator in a region other than an inlet of the working fluid channel into which the working fluid flows from the outside of the evaporator and other than an outlet of the working fluid channel through which the working fluid flows out of the evaporator. The output value of the temperature sensor is used to adjust the temperature of the working fluid.

Abstract: A Rankine cycle apparatus includes a pump, an evaporator, an expander, a condenser, and an internal heat exchanger. The internal heat exchanger allows heat exchange to take place between a working fluid discharged from the expander and a working fluid discharged from the pump. A temperature of the working fluid at an inlet of the expander is set so that a temperature of the working fluid at an outlet of the expander be higher than a saturation temperature on a high-pressure side of the cycle.

Abstract: A Rankine cycle apparatus includes a pump, an evaporator, an expander, a condenser, and an internal heat exchanger. The internal heat exchanger allows heat exchange to take place between a working fluid discharged from the expander and a working fluid discharged from the pump. A temperature of the working fluid at an inlet of the expander is set so that a temperature of the working fluid at an outlet of the expander be higher than a saturation temperature on a high-pressure side of the cycle.

Abstract: A combined heat and power system is provided with a Rankine cycle passage, a heat medium passage, an evaporator, an expander, a condenser, a pump, a temperature sensor, a sensor, and a controller. The evaporator receives the heat from the heat medium to heat a working fluid. The temperature sensor detects the temperature of the heat medium after radiating heat for heating the working fluid. The sensor detects the pressure of the working fluid flowing between the outlet of the evaporator and the inlet of the expander. The controller adjusts the rotation speed of the pump based on the temperature detected by the temperature sensor, and in addition, adjusts the rotation speed of the expander based on the pressure detected by the sensor.

Abstract: An air cooling unit is an air cooling unit used in a Rankine cycle system and includes an expander and a condenser. The expander recovers energy from a working fluid by expanding the working fluid. The condenser cools the working fluid using air. The air cooling unit includes a heat-transfer reducer that reduces heat transfer between the expander and an air path.

Abstract: An evaporator includes an introducing portion that introduces a heat source gas from a heat source gas pipe, a heat source gas passage through which the heat source gas introduced from the introducing portion flows, a heating portion that is disposed in the heat source gas passage and at which a working fluid is heated by the heat source gas, an increasing portion at which a cross-sectional area of the heat source gas passage gradually increases from an upstream side towards a downstream side in the heat source gas passage, and a flow regulating plate that is disposed on an upstream side from the heating portion in the heat source gas passage and that has a plurality of holes which allow the heat source gas to pass through the plurality of holes.

Abstract: A combined heat and power system according the present disclosure includes a Rankine cycle apparatus including an evaporator that heats a working fluid by heat exchange between the working fluid and a heat source medium, an expansion machine that converts expansion power of the working fluid into rotational power, and a condenser that cools the working fluid by heat exchange between the working fluid and a heat medium, and a thermal circuit for using the heat medium heated by the condenser. An expansion volume ratio of the expansion machine is equal to or less than an expansion ratio in a theoretical Rankine cycle determined based on a state of a temperature and a pressure of the working fluid at a discharge port of the expansion machine and a state of a temperature and a pressure of the working fluid at a suction port of the expansion machine.

Abstract: An evaporator which heats working fluid with high-temperature fluid to evaporate the working fluid includes: a working fluid channel arranged in a flow direction of the high temperature fluid and through which the working fluid flows; and a temperature sensor provided for the working fluid channel. A part of the working fluid channel is exposed to outside of a housing of the evaporator, and the temperature sensor is provided in the part of the working fluid channel exposed to the outside of the housing of the evaporator in a region other than an inlet of the working fluid channel into which the working fluid flows from the outside of the evaporator and other than an outlet of the working fluid channel through which the working fluid flows out of the evaporator. The output value of the temperature sensor is used to adjust the temperature of the working fluid.

Abstract: An exhaust heat recovery apparatus includes an exhaust heat passage through which a first heat medium holding exhaust heat flows; a second heat medium passage through which the second heat medium, of which temperature is lower than that of the first heat medium, flows; a Rankine cycle which includes a pump, an evaporator, an expander, and a condenser and causes heat exchange at the evaporator between the first heat medium flowing through the exhaust heat passage and a working fluid, so that the working fluid is evaporated, the evaporated working fluid expands at the expander, and power is generated; and an exhaust heat recovery heat exchanger which causes heat exchange between the first heat medium flowing through the exhaust heat passage and the second heat medium flowing through the second heat medium passage, so that the second heat medium is heated and exhaust heat of the first heat medium is recovered.

Abstract: A CHP system includes a combustor as a heat source, a Rankine cycle apparatus, a second heat exchanger, and a thermal fluid flow path. The Rankine cycle apparatus includes, as an evaporator, a first heat exchanger that absorbs thermal energy from combustion gas (thermal fluid). The second heat exchanger absorbs thermal energy from the combustion gas and transfers the thermal energy to a heat medium. The first heat exchanger and the second heat exchanger are disposed in the thermal fluid flow path. The thermal fluid flow path includes a first flow path that allows the combustion gas to reach the first heat exchanger directly from the combustor and a second flow path that allows the combustion gas to reach the second heat exchanger directly from the combustor.

Abstract: An evaporator which heats working fluid with high-temperature fluid to evaporate the working fluid includes: a working fluid channel which is arranged in a flow direction of the high temperature fluid and through which the working fluid flows; and a temperature sensor which is provided for the working fluid channel. A part of the working fluid channel is exposed to outside of a housing of the evaporator, and the temperature sensor is provided in the part of the working fluid channel exposed to the outside of the housing of the evaporator in a region other than an inlet of the working fluid channel into which the working fluid flows from the outside of the evaporator and other than an outlet of the working fluid channel through which the working fluid flows out of the evaporator. The output value of the temperature sensor is used to adjust the temperature of the working fluid in the evaporator.

Abstract: A CHP system includes a combustor (heat source), a Rankine cycle apparatus, and a second heat exchanger. The Rankine cycle apparatus includes, as an evaporator, a first heat exchanger that absorbs thermal energy produced in the combustor. The second heat exchanger is located closer to the combustor than is the evaporator, absorbs thermal energy produced in the combustor, and transfers the thermal energy to a heat medium.

Abstract: An air cooling unit is an air cooling unit used in a Rankine cycle system and includes an expander and a condenser. The expander recovers energy from a working fluid by expanding the working fluid. The condenser cools the working fluid using air. The air cooling unit includes a heat-transfer reducer that reduces heat transfer between the expander and an air path.

Abstract: A permanent magnet synchronous machine includes a rotor including a core body and an overhang protruding further in an axial direction than a core of a stator. An end surface of the core body includes an N-region disposed on a north pole and an S-region disposed on a south pole. The overhang includes first permanent magnets arranged along an outer edge of the end surface with distances therebetween and a plurality of second permanent magnets disposed on the end surface and adjacent to the first permanent magnets. The first permanent magnets include at least one of a permanent magnet comprising a north pole facing the N-region and a permanent magnet comprising a south pole facing the S-region. The second permanent magnets are provided in the configuration which causes the second permanent magnets to generate a magnetic flux extending from the S-region toward the N-region.

Abstract: To improve the reliability of the Rankine cycle device using a sealed-type expansion machine, the Rankine cycle device 100 according to the present disclosure comprises a pump 1, a heater 2, an expansion machine 3, a radiator 5, and a cooling path 8. The expansion machine 3 comprises an expansion mechanism 11 for extracting a power from the working fluid, an electric power generator 12, a sealed container 10 containing the expansion mechanism 11 and the electric power generator 12, a first inlet 34a, a first outlet 35a, a second inlet 30a, and a second outlet 31a. The radiator 5 is connected to the pump 1 with a flow path to cool the working fluid drained from the second outlet 31a. The cooling path 8 which connects the first outlet 35a to the second outlet 30a has a cooler 4 to cool the working fluid drained from the first outlet 35a.

Abstract: A permanent magnet synchronous machine includes a rotor including a core body and an overhang protruding further in an axial direction than a core of a stator. An end surface of the core body includes an N-region disposed on a north pole and an S-region disposed on a south pole. The overhang includes first permanent magnets arranged along an outer edge of the end surface with distances therebetween and a plurality of second permanent magnets disposed on the end surface and adjacent to the first permanent magnets. The first permanent magnets include at least one of a permanent magnet comprising a north pole facing the N-region and a permanent magnet comprising a south pole facing the S-region. The second permanent magnets are provided in the configuration which causes the second permanent magnets to generate a magnetic flux extending from the S-region toward the N-region.