摘要:
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.
摘要:
A refrigeration apparatus includes a high-temperature side circulation circuit and a low-temperature side circulation circuit. The high-temperature side circulation circuit A is configured by connecting a high-temperature side compressor, a high-temperature side condenser, a high-temperature side expansion valve, and a high-temperature side evaporator of a cascade heat exchanger to one another. The low-temperature side circulation circuit is configured by connecting a low-temperature side compressor, a low-temperature side condenser of the cascade heat exchanger, a receiver that stores a liquid refrigerant, a solenoid valve, a low-temperature side expansion valve, and a low-temperature side evaporator to one another. A refrigerant in the low-temperature side circulation circuit includes a zeotropic refrigerant mixture containing at least CO2 and R32. The content of R32 in the entire zeotropic refrigerant mixture is 50% to 74% by mass, and the GWP of the zeotropic refrigerant mixture is equal to or less than 500.
摘要:
An air-conditioning apparatus includes a compressor, an indoor heat exchanger configured to function as a condenser or an evaporator, indoor heat exchanges each configured to function as a condenser or an evaporator, a plurality of expansion valves each provided for a corresponding one of the indoor heat exchangers each configured to adjust a flow rate of a refrigerant that flows through the corresponding indoor heat exchanger and a controller configured to control an operation capacity of the compressor and opening degrees of a plurality of expansion devices. When increasing heat exchange performance of the indoor heat exchanger, the controller increases the operation capacity of the compressor and controls the opening degree of the expansion valve corresponding to the indoor heat exchanger to decrease the flow rate of the refrigerant that flows through the indoor heat exchanger.
摘要:
An air-conditioning apparatus according to the present invention includes at least indoor heat exchangers. In response to a request to increase heat exchange performance from the indoor heat exchanger, the air-conditioning apparatus decreases a heat exchange capacity of an outdoor heat exchanger and controls an opening degree of an expansion valve corresponding to the indoor heat exchanger a to decrease a flow rate of a refrigerant that flows through the indoor heat exchanger.
摘要:
An air-conditioning apparatus includes a plurality of intermediate heat exchangers performing the same function (as a condenser or an evaporator) and allows each intermediate heat exchanger to exchange heat between a refrigerant heated or cooled in a refrigeration cycle on a heat source side and a heat medium flowing through a heat medium circuit on a use side such that heat energy produced on the heat source side is transmitted to use side heat exchangers. A controller calculates the difference between a heat medium inlet temperature and a heat medium outlet temperature Two of the use side heat exchanger which is operating to obtain a heat medium temperature difference for the use side heat exchanger, and controls a heat medium flow control device such that the heat medium temperature difference reaches a target heat medium temperature difference.
摘要:
There are provided a plurality of use-side heat exchangers, inter-heat-medium heat exchangers, heat medium flow path switching devices, which switch flow paths, and pumps, which feed heat media to these paths; the inter-heat-medium heat exchangers heat or cool a heat medium by exchanging heat between the heat medium and a heat source fluid fed from a heat source apparatus. About half of the plurality of use-side heat exchangers are preheated or precooled, and the remaining use-side heat exchangers which are not preheated or precooled exchange heat media with use-side heat exchangers that have been preheated or precooled and that are not yet started to operate, suppressing energy consumed for preheating or precooling.
摘要:
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.
摘要:
Energy saving of a refrigerating cycle device is achieved by equalizing heat-medium inlet temperatures of a plurality of use-side heat exchangers. There are provided with a plurality of use-side heat exchangers, inter-heat-medium heat exchangers, a channel that connects the inter-heat-medium heat exchanger and the use-side heat exchanger, a heat-medium circulation circuit having heat-medium channel switching devices that switch between a first heat-medium channel, which connects the inter-heat-medium heat exchanger and the use-side heat exchanger, and a second heat-medium channel, which connects the inter-heat-medium heat exchanger and the use-side heat exchanger, and a heat source unit that heats or cools the heat medium with the inter-heat-medium heat exchangers, in which an auxiliary heat exchanger that performs heat exchange between the heat mediums flowing out from the inter-heat-medium heat exchangers is disposed so as to equalize the heat-medium temperatures flowing into the use-side heat exchangers to realize energy saving of the refrigerating cycle device.
摘要:
A printed matter, wherein a line latent image and a digital watermark are printed in a predetermined region in an overlapping manner, the line latent image becoming visible when a line filter provided with a line pattern formed on a transparent film is superimposed thereon.
摘要:
A laminated ceramic electronic component includes a plurality of conductor pattern layers for a coil arranged to overlap each other to form substantially U-shaped conductors for the coil. The conductors for the coil are electrically connected in series through via holes for inner layer connection provided in ceramic green sheets to form a spiral coil. A plurality of lead conductor pattern layers also overlaps each other to form lead conductors. One lead conductor pattern layer is disposed per a predetermined number of conductor pattern layers for the coil. An end of each lead conductor pattern layer is in contact with the corresponding conductor pattern layer for the coil. In other words, the thickness of the lead conductors is less than the thickness of the conductors for the coil.