177results about How to "Lower pressure ratio" patented technology

The invention belongs to the technical field of energy conservation, and relates to a variable frequency energy-saving control method for a refrigeration system. The control method comprises the steps of: determining the mass flow of a refrigerant according to the change or change trend of cooling load, then determining consumed power of a compressor which satisfies the flow, predicting the minimum condensation pressure which ensures that the thermal load of a condenser satisfies the cooling load and the power change of the compressor through an established energy-saving control mathematical model, and gradually adjusting the power frequency of the compressor to ensure that the rotating speed of the compressor reaches a predicted value; and adjusting the opening degree of an expansion valve to ensure that the condensation pressure reaches to be lowest, realizing the minimum pressure difference operation between the condenser and an evaporator, and ensuring that the operation energy consumption of the refrigeration system is lowest. The method solves the optimizing control problem of the compressor, the expansion valve and a fan in the system, utilizes the energy-saving control mathematical model to perform joint regulation on controllable factors (such as the rotating speed of the compressor, the opening degree of the expansion valve, and the air volume of an outdoor unit) of the operation of the system, ensures that the refrigeration system operates at a best operating point, and realizes the further energy conservation of the refrigeration system based on the variable frequency regulation.

The invention relates to a heat pump drying device with a humidity and temperature adjusting function. The heat pump drying device with the humidity and temperature adjusting function comprises a drying room, an air return flue, a circulation draught fan in the air return flue, an air exhaust flue communicated with the air return flue, an exhaust fan at an opening of the air exhaust flue, an air heat recovery device arranged at the intersection of the air return flue and the air exhaust flue, and a heat pump unit, wherein the air return flue is communicated with an air feeding opening and an air return opening of the drying room. The heat pump unit comprises a compressor, a temperature-adjusting condenser, a main condenser, an expansion valve, an indoor evaporator and a heat recovery evaporator which are sequentially connected in series through pipes, wherein the main condenser is arranged in the air return flue, and the heat recovery evaporator is arranged at an opening of the air exhaust flue. The temperature and humidity of the drying room can be adjusted directly at any time according to the need of a drying process, sensible heat and latent heat contained in high-temperature and high-humidity air exhausted out of the drying room are recovered to the maximum extent, the evaporating temperature of the heat pump drying device is increased so as to improve the efficiency of the drying device, and accordingly the heat pump drying device has higher properties of energy saving and environmental friendliness.

The invention relates to a superhigh-temperature heat pump drying system. The superhigh-temperature heat pump drying system comprises a drying room, an air return duct, a circulating draught fan, an exhaust duct, an exhaust fan, an air heat recovering device and at least two heat pump units. The air return duct is communicated with an air supply port and an air return port of the drying room. The circulating draught fan is arranged in the air return duct. The exhaust duct is communicated with the air return duct. The exhaust fan is arranged at a duct opening of the exhaust duct. The air heat recovering device is arranged at the intersection of the air return duct and the exhaust duct. The heat pump units are used in parallel. According to the superhigh-temperature heat pump drying system, the two or more heat pump units work in parallel, and the drying room is heated by absorbing low-grade ambient air heat at the initial stage of the drying process, so that the temperature is increased; after the temperature is increased to a certain extent, high-temperature and high-humidity air exhausted out of the drying room is dehumidified, and sensible heat and latent heat contained in the high-temperature and high-humidity air are recovered to the maximum extent; due to the gradient difference of the temperature ranges of cycle working fluid of the heat pump units, relatively higher air supply temperature can be provided through the system, and meanwhile it is guaranteed that the evaporating temperature of the drying units is sufficiently increased.

The invention relates to the field of manufacturing high voltage metal oxide surge arresters and discloses a formula of a non-linear resistor for a high voltage surge arrester and a manufacturing method thereof, which are applicable to the metal oxide surge arresters for protecting high voltage power devices, in particular to the metal oxide surge arresters of ultra-high voltage AC power transmission and transformation systems of 750kV and 1000kV. The formula comprises additives consisting of the following components by weight percent: 3.1-4.8% of bismuth oxide, 2.5-4.6% of antimony oxide, 1.2-2.6% of cobalt oxide, 0.7-1.5% of silicon oxide, 0.5-0.9% of manganese oxide, 0.7-1.3% of chromium oxide, 0.3-0.9% of nickel oxide, 0.04-0.13% of boron glass powder and 0.01-0.06% of aluminum oxide. The balance is a main component-zinc oxide.

The invention discloses an absorption compression type automatic-overlapping refrigerating system and a use method. The absorption compression type automatic-overlapping refrigerating system comprises a generator and the like; the generator is communicated with a solution heat exchanger which is communicated with an absorber; the absorber is further communicated with the solution heat exchanger which is communicated with the generator; the generator is communicated with a condenser which is communicated with a gas-liquid separator; the gas-liquid separator is further communicated with an evaporative condenser which is communicated with a first gas-liquid heat exchanger, the first gas-liquid heat exchanger is communicated with an evaporator which is communicated with the first gas-liquid heat exchanger, and the first gas-liquid heat exchanger is communicated with the evaporator which is communicated with the first gas-liquid heat exchanger communicated with a compressor; the gas-liquid separator is communicated with the evaporative condenser; the compressor and the evaporative condenser are communicated with the absorber.

The invention discloses a supercritical/trans-critical carbon dioxide combined cycle power generation system for internal combustion engine waste-heat utilization. After carbon dioxide enters a working medium pump from a condenser, the carbon dioxide is compressed into supercritical gas, then the compressed carbon dioxide gas is divided into two branches in an outlet of the working medium pump, wherein one branch is used as the working medium for a trans-critical carbon dioxide Rankine cycle system, and the another branch is used as the working medium of a supercritical carbon dioxide recompression Breton cycle system. The supercritical/trans-critical carbon dioxide combined cycle power generation system uses the waste heat of internal combustion engine exhaust gas as a heat source, and sequentially recycles the high quality waste heat of the internal combustion engine exhaust gas by supercritical carbon dioxide recompression Breton cycle, and recycles the low quality waste heat of theinternal combustion engine exhaust gas by trans-critical carbon dioxide Rankine cycle, and converts the waste heat energy of a power device into electric energy, has the characteristics of high thermal efficiency, compact structure, low maintenance cost and the like, and can significantly improve the economy of the power device.

The invention discloses a low-grade heat energy auxiliary-drive composite low-temperature refrigerating system. The system comprises a generator, an ejector, a working medium pump, a condenser, a gas-liquid separator, a compressor, a first throttling component, a condensation evaporator, a second throttling component, an evaporator and a heater. A high-boiling-point component is condensed into liquid to serve as a low-boiling-point component cooling medium through the ejector driven by the low-grade heat energy; and the ejector has another function of increasing suction pressure of the low-boiling-point component at a suction port of the compressor to reduce the compression ratio of the compressor so as to realize lower refrigerating temperature. Because the compression process of the high-boiling-point component during circulation is finished by the ejector, the power consumption of the compressor is reduced; and the ejector also improves the suction pressure of the low-boiling-point component at the suction port of the compressor and is also favorable for further reducing the power consumption of the compressor. The system has the advantages of realizing high-efficiency utilization of a low-grade energy source, along with stable running, obvious energy saving effect and broad application prospect.

The invention provides an air conditioning system which independently controls temperature and humidity and a refrigeration /dehumidifying method. A cooling media circulation system, a water circulation system and an air supply system of an air duct machine are assembled to realize independent control of the temperature and the humidity, thus greatly improving comfort of a user and realizing energy saving.

The invention provides an energy-saving environment-friendly layout of a large-scale routine hypersonic wind tunnel. The system comprises a gas tank, a heater, a stabilization segment, a jet pipe, a test segment, an ultra-expanding segment and a heat exchanger, wherein the stabilization segment, the jet pipe, the test segment and the ultra-expanding segment are successively connected to form a major test wind tunnel assembly, the heat exchanger comprises an intermediate channel and a peripheral channel encircling the intermediate channel, an outlet of the ultra-expanding segment communicates with the intermediate channel of the heat exchanger, the gas tank communicates with the peripheral channel of the heat exchanger, and high-pressure gas in the gas tank is sent into the heater via the peripheral channel of the heat exchanger by means of a gas pipeline, then is sent into the stabilization segment after passing through the heater and is discharged through flowing through the intermediate channel of the heat exchanger after being tested in the major assembly of a test wind tunnel. According to the invention, energy consumption is reduced, the operation cost is decreased, at the same time, the influence on the environment is reduced, and the problems of large exhaust noise and waste of afterheat of a conventional hypersonic wind tunnel can be solved.

The invention discloses a refrigerating system with an ejector. The main trend of ejectors is that: a working medium becomes a gaseous working medium through an expansion valve, and the gaseous working medium from an evaporator enters the ejector for pressure expanding through injection, so that the pressure of the working medium is improved; and the working medium is compressed in a compressor and enters a condenser to finish a refrigerating cycle. However, according to the invention, a liquid working medium passing through the expansion valve is continuously throttled through another expansion valve to have a low-temperature low-pressure state, is evaporated in the evaporator, becomes a gaseous working medium through heat absorption to be ejected into the ejector, is pressurized in the ejector and enters the condenser to finish a refrigerating cycle. Therefore, the pressure of the working medium in the compressor is improved, a pressure ratio of the compressor is reduced, and the power consumption of the compressor is reduced, so that the efficiency of the refrigerating system is improved.

The invention discloses an energy self-supplying type carbon dioxide cold and hot electricity co-generation system used for a low-grade heat source. The energy self-supplying type carbon dioxide coldand hot electricity co-generation system comprises a transcritical carbon dioxide reheat Rankine dynamic cycle system and a transcritical carbon dioxide injection refrigeration cycle system; the energy self-supplying type carbon dioxide cold and hot electricity co-generation system integrates reheat Rankine dynamic cycle and injection refrigeration cycle, adopts carbon dioxide as a single workingmedium, converts low-grade heat energy to useful work through a extraction turbine of the transcritical carbon dioxide reheat Rankine dynamic cycle system and supplies the heat energy to users by using a water heater. The transcritical carbon dioxide injection refrigeration cycle system utilizes high-pressure exhaust waste heat of the extraction turbine to drive an injector to output cold energy to the users. Through reasonable arrangement of the system, the system can output more electric energy. By adoption of a working medium pump and a low-pressure-ratio gas compressor, the energy self-supplying type carbon dioxide cold and hot electricity co-generation system reduces compression power efficiently during the system operation and improves net electric generation and conversion efficiency of the low-grade heat energy of the system.

A turbomachine comprising a ducted fan, a low-pressure turbine shaft and a reduction gearbox housed in a casing between the fan and the low-pressure turbine shaft, the fan rotor supplying airflow to a primary stream and a secondary stream and comprising a hub of diameter D1, wherein—the diameter D3 of the fan rotor is greater than 82 inches (2.08 metres),—the pressure ratio of the fan is between 1.10 and 1.35, the turbomachine comprises a low-pressure compressor separate from the fan, the reduction gearbox being interposed between the fan rotor and a turbine shaft of the low-pressure compressor, and wherein the reduction gearbox casing has an outside diameter D2 greater than the diameter D1 of the hub, the pitch diameter D4 of the reduction gearbox ring being between 0.15 and 0.35 times the fan rotor diameter.

The invention provides an assembly method of a two-stage compression heat pump air-conditioning and refrigerator system and a device used the method. The method is characterized in that a split-type air-conditioning outdoor system and a split-type refrigerator outdoor system are assembled together; the compressors of two different pressure levels of the same unit are used; the adjustment of the air and the refrigeration of the refrigeration are realized through the serial and parallel arrangement of the cooling pipeline, the control of the control valves, and the auxiliary function of the intermediate heat exchanger cold/heat exchange system; as the air-conditioning refrigerant cycling circuit and the refrigerator refrigerant cycling circuit arranged in parallel supply heat energy to the rooms and supply cold energy to the refrigerator when operating in opposite directions; the air-conditioning refrigerant cycling circuit and the refrigerator refrigerant cycling circuit supply cold energy to both the room and the refrigerator when arranged both in series and in parallel and operating in collaboration. The invention realizes the transfer between different work modes of the system through changing the cycling direction of the refrigerant of the system and the allocation of flow of the refrigerant. The different types of energy utilize each other, and the energy-saving and noise-reducing effects are obvious. The indoor machine can be arranged in an embedded type, which saves space and is beneficial for the beautification of the environment. The device is widely applicable to locations such as households, villas, hotels and motels, etc.

The invention discloses a turbine rear support bearing seat, a cooling method and a turbine fan engine. The turbine rear support bearing seat of the turbine fan engine comprises an outer containing cartridge receiver, a main runner cartridge receiver, a gas exhauster cartridge receiver and a bearing seat, wherein an outer duct is formed between the outer containing cartridge receiver and the main runner cartridge receiver; an inner duct is formed between the main runner cartridge receiver and the gas exhauster cartridge receiver; a bearing cavity is formed in the gas exhauster cartridge receiver, and a bearing support plate used for guiding the outer containing cold liquid in the outer duct to the bearing seat for exchanging heat for cooling the bearing seat is arranged on the outer wall surface of the bearing seat. The bearing support plate is used for supporting the fluid flow passage, offering the liquid cooling loop for cooling rear support bearing seat, cooling and protecting the oil inlet pipeline and the oil returning pipeline of the oil and improving the structure performance of the complete machine.

The invention discloses a rectifying type variation-concentration self-overlaying gas liquefaction system which comprises a compressor, a condenser, a rectifying device and a feed gas liquefaction loop, wherein the feed gas liquefaction loop comprises a first heat exchanger group, a second heat exchanger group and a first throttle valve arranged between the first heat exchanger group and the second heat exchanger group; and two parallel arranged first variable concentration loop and second variable concentration loop are arranged between the rectifying device and an air suction hole of the compressor. The rectifying device is used for replacing a multistage separation process of the traditional mixed refrigerant gas liquefaction system, and different components of high-pressure liquids are led from the bottom and the top of the rectifying device and are respectively subjected to pressure reduction and then enter the two heat exchanger groups, water equivalent change of a feed gas cooling and liquefaction process is optimized and matched, and variable working condition regulating capacity of the liquefaction system is improved by adopting the variable concentration loops. The invention has the advantages of simple structure, operation reliability, high system liquefaction efficiency and the like, and is suitable for various small and minitype gas liquefaction systems with high performance requirements on variable working conditions.

A control apparatus is configured, after a torque increase request to increase an engine torque is made, to perform an air supply operation using an electric compressor where it is predicted that a pressure ratio of a turbo-compressor will become less than 1 after a throttle valve is opened accompanying the torque increase request, and, on the other hand, not to perform the air supply operation where it is predicted that the pressure ratio will not become less than 1 after the throttle valve is opened.

The invention discloses a heat-accumulating-type heat pump system for a vehicle. The heat-accumulating-type heat pump system comprises three subsystems: a refrigerant circulation system, a secondary circuit circulation system and a heat accumulating circulation system; the secondary circuit system comprises a second circulation pump, a first heat exchanger, a sixth heat exchanger, a temperature air door and a kettle; the second circulation pump, the first heat exchanger, the sixth heat exchanger and the kettle are sequentially connected through a pipeline to form a cycle; and the sixth heat exchanger and the temperature air door are located in an air handling unit. The secondary circuit system is adopted, thus the heating capacity of the heat pump system can be excavated better, meanwhile, the pressure of the high-pressure side of the refrigerant circulation system is lowered, the ratio of the high pressure to the low pressure of the system is also decreased, and the operating environment of a compressor is improved, especially when the compressor continuously works under a heat pump mode for a long time.

The invention discloses an automobile air-conditioning system. The automobile air-conditioning system further comprises an ejector (12) and an intermediate heat exchanger (6). In a heating mode, a working medium flowing from an outlet of a second heat exchange (102) is divided into a first channel and a second channel; the first channel of the working medium flows into the ejector (12) through a drive inlet after flowing out of a high-temperature side (62), and then is divided into a first branch and a second branch after being ejected from an outlet of the ejector (12), the first branch of the working medium flows back into a compressor (1) through a low-temperature side (61), and the second branch of the working medium flows into the ejector (12) through a bypass guide hole via a third heat exchanger (3). The automobile air-conditioning system has the advantages that efficiency of the compressor and the air-conditioning system can be improved effectively, requirements for heat in high and cold environment can be guaranteed, and comfortableness of passengers and stable and efficient performance of heating components are guaranteed.

The invention provides a two-stage compressor heat pump and an oil return control system and method thereof. The two-stage compressor heat pump comprises an indoor heat exchanger, an outdoor heat exchanger, a low-pressure compressor (1) and a high-pressure compressor (2), wherein the exhaust opening of the low-pressure compressor (1) communicates with the intake opening of the high-pressure compressor (2) through a medium-pressure pipeline (17); the exhaust end of the high-pressure compressor (2) is also connected with an oil separator (3); oil separated by the oil separator (3) is divided into two paths through an oil return pipeline (18); one path is connected to the intake end of the low-pressure compressor (1) through a ow-pressure oil return pipeline (19), and the other path is connected to the intake end of the high-pressure compressor (2) through a high-pressure oil return pipeline (20). According to the two-stage compressor heat pump, oil returning can be separately performed on the low-pressure compressor and the high-pressure compressor as required to ensure uniform oil return of both the low-pressure compressor and the high-pressure compressor; and the phenomenon of abnormal stall caused by wear of a cylinder is effectively prevented, the service lives of the compressors are prolonged, and the performance of the heat pump is improved.

The invention relates to an all-working-condition efficient fresh air ventilator for multi-stage heat pump heat recovery. The ventilator comprises a first air duct and a second air duct, and further comprises a multi-stage nested refrigerant loop, wherein the multi-stage nested refrigerant loop forms a temperature gradient on the evaporation side, bears more fresh air heat loads at a high evaporation temperature and bears more fresh air wet loads at a low evaporation temperature, therefore load gradient change distribution is formed; and the multi-stage nested refrigerant loop forms a temperature gradient on the condensation side, and a gradient condensation temperature matches the slippage of a return air temperature, so that a pressure ratio of each stage of refrigerant steam compressioncycle is reduced. Compared with the prior art, a multi-stage heat pump heat recovery cycle is arranged, so that the pressure ratio of each stage of refrigerant steam compression cycle is reduced, thepower consumption of a compressor is reduced, and the system energy efficiency can be effectively improved; and pertinence and comprehensiveness matching can be carried out on annual working conditions, and multiple modes of refrigeration and dehumidification in summer, heating in winter and internal circulation in transition seasons can be achieved.