367results about How to "Improve the coefficient of performance" patented technology

A dynamic heat sink engine including a storage vessel having a working fluid outlet and a working fluid inlet. The lower portion of the storage vessel contains a cryogenic working fluid, such as liquid hydrogen, at a temperature at near its boiling point. The engine further includes a working fluid circuit extending between the working fluid outlet and the working fluid inlet of the storage vessel. The working fluid circuit includes the serial connection of the following components from the working fluid outlet to the working fluid inlet: a fluid pump; a vaporizer having a liquid line passing therethrough; a heater; an expansion engine having a rotary output shaft; an electrical generator connected to the rotary output shaft of the expansion engine; a vapor line passing through the vaporizer, the vaporizer including a heat exchanger providing thermal communication between the liquid line and the vapor line.

A refrigerating system, using CO2 as a refrigerant, for an air conditioner for an automobile. A pressure at the outlet of the heat emitter 2 is controlled to a target value in accordance with the temperature of the refrigerant at the outlet of the heat emitter for obtaining an operation of the refrigerating system along the optimum control line eta max. A pressure reducer 4 and a cooler 5 are provided on a branched passageway 28 branched from a refrigerant recirculating passageway 27 for injection. The cooler 5 is for obtaining a heat exchange between a flow of the refrigerant on the branched passageway 28 after being cooled by the pressure reducer and a flow of the refrigerant on the main passageway 27, thereby cooling the refrigerant directed to the evaporator. In a second aspect of the invention, a means is provided for increasing a target value of the pressure at the pressure reducer when a thermal load of the refrigerating system is high. In a third aspect, a series of pressure reducers are arranged on the main recirculating passageway. The second stage pressure reducer is controlled so as to obtain a desired value of degree of super heating at the inlet of the compressor.

The invention relates to an outdoor double heat exchanger defrosting low-temperature heating system, which comprises a compressor (1), four-way reversing valves, an outdoor heat exchanger, a throttling device and an indoor heat exchanger (11). The outdoor heat exchanger is divided into two parts, namely a first outdoor heat exchanger (6) and a second outdoor heat exchanger (7) respectively. One end of the first outdoor heat exchanger (6) and one end of the second outdoor heat exchanger (7) are connected together through the throttling device (9) and an electromagnetic valve (8); and the other ends of the first outdoor heat exchanger (6) and the second outdoor heat exchanger (7) are respectively connected with an air pipe E or C at any one end of two four-way reversing valves; and an inlet/outlet pipe of the throttling device (9) is connected with an inlet/outlet pipe of the electromagnetic valve (8). The outdoor heat exchanger is divided into two parts; the two outdoor heat exchangers alternatively defrost, are used as an evaporator and a condenser in turn, and can still provide heat for the indoor heat exchanger during defrosting. During heating at low temperature, the outdoor heat exchanger B is used as the condenser to heat the inlet air and the inlet air temperature outdoors is raised. Therefore, the coefficient of performance and the heating capacity are effectively improved.

The invention discloses a composite type air conditioning device and a conditioning method of the composite type air conditioning device. The device comprises a refrigerant circulation loop, a solution circulation loop and an air processing process. Compared with the prior art, the composite type air conditioning device and the conditioning method of the composite type air conditioning device have the beneficial effects that a heat pump heat exchanger is arranged in and coupled to a solution processor to build an inner heat type regenerator and an inner cool type dehumidifier, the heat pump heat exchanger is utilized for carrying out solution dehumidification-before precooling and regeneration-before preheating, and the heat efficiency of the regeneration and dehumidification process is improved; condensate waste heat is sufficiently utilized as an auxiliary heat source for solution regeneration, indoor exhaust waste heat is utilized for heating fresh air, high-temperature solution waste heat is utilized for heating a dilute solution for regeneration, and maximum utilization of energy is achieved. Under winter operating conditions, supply air is humidified through the solution regeneration process, the air humidity at an inlet of an evaporator is lowered through solution dehumidification, outdoor wet air total heat is used as a low-temperature heat source of a heat pump system, and frostless continuous efficient operation in winter can be achieved in wet and cold areas; and under summer operation conditions, the evaporator achieves dry-operating-condition operation, and system performance is improved.

A system for depressurizing a gas in a pipeline is described. The system com-prises an expander configured and arranged for generating mechanical power by expanding gas from a first pressure to a second pressure. The system further comprises a heat pump and a heat transfer circuit containing a heat transfer fluid circu-lating therein, for receiving heat from the heat pump and delivering heat to the gas through a heat exchanger. A controller is further provided, configured and arranged for modulating a flow rate of the heat transfer fluid circulating in the heat transfer circuit as a function of a heat rate to be transferred from the heat transfer fluid to the gas, particularly as a function of temperature differentials between the gas and the heat transfer fluid at a gas inlet side and a gas outlet side of the heat exchang-er.

The invention provides a PVT heat pump system capable of achieving day and night time-division heat, power and cold supply through solar radiation and sky cold radiation, and a photovoltaic power generation technology and a PVT heat pump technology which are relatively independent and mutually promoted in function are used simultaneously. Solar radiation energy and sky long-wave cold radiation energy are used as main energy resources of the system, and the energy is converted into electric energy, heat energy and cooling capacity through a PVT photoelectric-evaporation/condensation assembly in different modes at different times. The system integrates the various functions of power generation, heating, cooling and the like, equipment composition is simple, the equipment utilization rate is high, the energy saving effect is remarkable, the energy utilization rate is increased to the greatest extent, and the effects of achieving multiple purposes through the system and achieving day and night time-division heat, power and cold supply are achieved.

The invention discloses a half-covering heat pump refrigeration and heat supply method and its air conditioning system, comprising two-staged heat pump loop, the first stage to undertake sensible heat load and produces hot water with fairly low temperature or cold water with fairly high temperature for radiant heating and refrigeration or being used for surface convection recuperator. The second stage to undertake latent heat load and fresh air load, the two stages of heat pump are mainly covered by water loop which consists of radiation interchange surface or dry surface air heat exchanger, electric three way regulating valve and water pump, cold and hot water in air conditioning from first stage of heat pump heat exchanger flows into heat exchanger to exchange heat, being separated by three way regulating valve into two branch lines with one branch line joining with another one through heat exchanger of the second stage then back to heat exchanger through pump. The half-covering heat pump refrigeration and heat supply method has broken limitation of air source hot pump, extended the application area of air cooling heat pump, reduced energy cost, increasing air quality in room, totally speaking, it's a comfortable, energy saving air conditioning system.

The invention relates to an air source heat pump unit and an operating method thereof. A compressor is communicated with an indoor heat exchanger through a first on-and-off valve and a four-way reversing valve; the indoor heat exchanger is connected with a bidirectional liquid accumulator through a first one-way valve; one path is connected to the compressor through an anti-frosting coil, a third throttle valve, an outdoor heat exchanger, the four-way reversing valve, the bidirectional liquid accumulator and a second on-and-off valve; the other path is connected to the compressor through an electromagnetic valve, a second throttle valve and the second on-and-off valve; the first one-way valve is connected in parallel with the first throttle valve; the third throttle valve is connected in parallel with a second one-way valve; the compressor is communicated with the outdoor heat exchanger through the first on-and-off valve and the four-way reversing valve; and the outdoor heat exchanger is connected with the bidirectional liquid accumulator through the second one-way valve and the anti-frosting coil, and then is connected to the compressor through the first throttle valve, the indoor heat exchanger, the four-way reversing valve, the bidirectional liquid accumulator, and the second on-and-off valve. The air source heat pump unit has the advantages of wide temperature application range, frosting delay, and high-efficiency operation all year round.

An air source solution-type heat pump device, which relates to a heat pump heating method based on the principle that the solution absorbs energy from the air and a device for implementing the method. The device comprises a coolant circulation loop and a solution circulation loop. The coolant circulation loop comprises a compressor, two solenoid valves, a regenerator, a four-way valve, a first heat exchanger, four one-way valves, a reservoir, a filter, an electronic expansion valve, a secondary heat exchanger, a gas-liquid separator and connecting tubes thereof. The solution circulation loop comprises a , a solution container, three manual valves, a frequency-variable pump, an electric three-way regulating valve, an regenerator, a second heat exchanger and connecting tubes thereof. The invention solves the problems that the water-cooling unit is not used in winter, the air source heat pump has poor refrigeration performance in summer (compared with the water-cooling unit) and has high risk of frost formation in winter. The device is a novel air source solution-type heat pump heating device capable of the water-cooling refrigeration in summer and the solution-based air heat absorption in winter.

A superconductive cable line, comprising an insulating pipe (2) for fluid through which a liquid hydrogen (1) is carried, a superconductive cable (10) stored in the insulating pipe (2) for fluid, and a heat exchange means performing heat exchange between the liquid hydrogen (1) and the cable (10). Since the superconductive cable (10) comprises cable cores in an insulating pipe for cable and is stored in the insulating pipe (2) for fluid, the outer periphery of the cable (10) is exposed to a low temperature environment and the superconductive cable is formed in a double insulating structure in association with the insulating pipe (2). As a result, since a heat invading into the superconductive cable (10) is lowered and a refrigerant is cooled by the liquid hydrogen (1), an energy cooling the refrigerant can be reduced.

The invention discloses a refrigeration circulating system with a double-stage-injection ejector. The refrigeration circulating system comprises a compressor, a condenser, a gas and liquid separator, a first throttling mechanism, a second throttling mechanism, a first evaporator, a second evaporator and the ejector with a double-stage injection function which are connected on a pipeline, the ejector is provided with two suction chambers and two diffusers, and two refrigerant flows with different evaporating temperatures from the two evaporators are respectively injected. The double evaporators with different evaporating temperatures are arranged and can match with change of the temperature of an air side better, and irreversible loss in an evaporation heat exchange process can be reduced. Simultaneously, higher outlet pressure of the ejector with the double-stage injection function can be obtained as compared with a conventional single-stage ejector, air suction pressure of the compressor is improved, air suction specific volume is reduced, and accordingly a performance coefficient and refrigerating capacity or heating capacity of unit volume of the system are further increased. Accordingly, the refrigeration system has remarkable advantages in terms of improving performances of a refrigeration system.

The invention discloses a solid adsorption heat pump device, which consists of a host, a mode switching device and an energy recovery device. The host comprises a plurality of adsorption beds and condensation evaporators for carrying out reactions such as adsorption, desorption, condensation or evaporation and the like; the mode switching device is connected with the host and used for switching refrigerating or heating modes of the solid adsorption heat pump device; and the energy recovery device is connected with the host and the switching device and used for recovering energy generated by the action of the host. Therefore, the solid adsorption heat pump device has double functions of refrigerating and heating, controls high-temperature fluid and low-temperature fluid as by-pass by means of a hot-cold energy recovery control mechanism, and can effectively solve the problem of unevenness of water at a water source end, increase refrigerating/heating capability, and improve coefficient of performance (COP) of the system.

The invention discloses a solar-powered VM circulating heat pump system, which comprises a VM circulating heat pump system, a solar water heating system, a heat supply circuit and a cold energy supply circuit, wherein a heat source heat exchanger is arranged between a hot cylinder and a heat regenerator in the circulating heat pump system; the heat source heat exchanger and a water container in the solar water heating system form a heat exchange circulating system; and the energy transfer between the two systems is completed. When the system is used, solar can be used as driving energy to drive a VM circulating heat pump to work to cool or heat in order to meet an air conditioner cooling requirement. The solar is clean, safe and reliable, so energy shortage and environmental pollution are prevented. The system can be widely used in industrial, commercial and civil concentrated cooling and heating systems.

The invention relates to an air conditioning energy saving device based on a Stirling machine and condensate water recycling technology and an application, and belongs to the field of air conditioners, refrigerators, Stirling machines and condensate water recycling technologies. The air conditioning energy saving device comprises two major parts, namely, a condensate water recycling device and a Stirling machine energy saving device, wherein the condensate water recycling device is mainly composed of a condensate water distributing device and a condensate water collecting pipe, and the air conditioner waste cold is subjected to recycling and reusing; and the Stirling machine energy saving device is mainly composed of four parts, namely an operating mechanism, a power mechanism, a starting and reversing mechanism and a control guarantee mechanism, and the air conditioner waste cold heat is reused. The conditioning energy saving device provided by the invention fully utilize the waste cold and the waste heat generated by an air conditioner according to a thinking that the heat is utilized to carry out heat dissipation and the waste cold is utilized to reduce consumption, the energy consumption of a fixed frequency air conditioner can be reduced by about 3%, the energy consumption of a variable frequency air conditioner is reduced by about 6%, in addition, the heat discharge of the air conditioner is reduced, an urban heat island effect is relieved, the energy conservation and emission reduction of an air conditioner cooling system is realized, and the air conditioning energy saving device has better air economic and social benefits.

The invention discloses a solar seawater desalination plant and an operation method thereof, belonging to the technical field of seawater desalination. The plant mainly consists of an air circulation system, a seawater treatment system, a solar heating system, a fresh water collecting system and the like. According to the invention, saturated air generates fresh water in a large temperature difference range through humidifying air with hot seawater and then dehumidifying the air with cold seawater by virtue of an adsorption type air water taking device and a saturated air humidifying and dehumidifying type solar distillation device, and simultaneously, cold air generates fresh water in a small temperature difference range through adsorption and desorption processes, thereby utilizing the moisture content of the air to the greatest extent, realizing the generation of fresh water by using air in the full temperature difference range and a full humidity range, effectively improving the fresh water yield of air flow per unit and improving the property index of the whole system.

The invention pertains to heating and hot water supply field, relating to a high efficiency large temperature rise compression heat pump set with a big inlet-outlet temperature difference at both a heat sink side and a head source side. The large temperature rise compression heat pump set is configured by assembling two water source heat pump devices, and each heat pump set comprises separately in series or in parallel a compressor, a condenser, an evaporator, a subcooler, and a throttling device, or an added economizer, and forms a separate working medium circulation loop. The inventive large temperature rise compression heat pump set can heat returned hot water step by step from a low temperature to a high temperature, the cold water is cooled step by step in a reverse direction of the temperature rise of the cooling water, and temperature difference between the hot water and cold water at the inlet and outlet of the heat pump is enlarged; and the performance coefficient of the heat pump set is further enhanced comparing with a simple two-stage compression heat pump in series, so that the comprehensive energy utilization efficiency and economy of the inventive system are increased greatly comparing with a common heat pump set.

The invention relates to an air condition method which compounds the desiccation by solution absorb and compressing refrigeration loop. The desiccation loop includes the desiccation loop part and the recovering loop part. The refrigerating evaporator of the compressing refrigeration loop provides the cold quantity needed by the absorbing cooler of the desiccation loop, at the same time, the liquid refrigerating medium of low temperature vapors after absorbing the solution thermal; the much higher temperature of the gas refrigerant is leaded into the condenser which provides the thermal for the heater of the recovering loop. Because the thermal of the absorber cool load is as the thermal load of the recover, the thermal load of the system recover can be decreased; even it can be saved completely. The evaporating temperature can be improved greatly and the energy cost can be lowered. So the cost can be decreased more.

The invention discloses a gas engine driven steam compressing and absorbing combined type heat pump hot water unit running method. The method includes the following steps that a gas engine drives a compressor to act. A refrigerant is compressed into high-temperature and high-pressure gas, becomes liquid after heat exchange and enters the compressor after absorbing heat and being evaporated into gas, and compression type refrigerant cycling is formed. The method further includes solution cycling and refrigerant cycling, hot user return water is divided into two ways to be heated; the first way of return water is subjected to heat exchange with exhaust fume of the gas engine in an exhaust fume heat exchanger and then enters a first condenser and a cylinder sleeve heat exchanger in sequence to be subjected to heat exchange, and therefore the temperature of the return water can be increased; and the second way of return water absorbs absorbing heat generated in an external cooling absorber, then enters a second condenser, is subjected to heat exchange with ammonia steam in the second condenser and is provided for a user to use after being heated. By means of the method, the primary energy ratio can be increased.

The condenser for refrigerator consists of one group of parallel vertical pipes of diameter 1-3 mm, upper and lower collecting pipes communicated with the upper ends and the lower ends of the vertical pipes separately, and heat dissipating plate adhered to one side of the vertical pipes. The present invention has small size effect raising heat exchange, reduced flow pressure drop caused by the combined vertical pipes and collecting pipes, reduced compressor load and raised performance coefficient. The present invention is superior to available coiled pipe condenser and has reduced pressure drop, raised heat exchange, saving in material, low cost, simple first and improved technological performance.

The invention discloses a combined heat pump system adopting trans-critical circulation and absorption heat pump co-production. A trans-critical compression subsystem comprises a compression unit, an air cooling unit, a throttling unit and an evaporation unit which are connected through working medium circulation. The air cooling unit is divided into a first heating pipe, a second heating pipe and an air cooling device in the flowing direction of a working medium, wherein the first heating pipe, the second heating pipe and the air cooling device release heat step by step and condense. A heat pump subsystem comprises a generator, a condenser, a first solution pump, a condensing evaporator, an absorber, a solution heat exchanger, a throttling device and a second solution pump. According to the system, by means of reasonable energy coupling, generation heat of the heat pump system comes from condensation heat of the trans-critical compression subsystem completely, a high-temperature heat source with the temperature of above 100 DEG C can be manufactured at the absorber only by inputting a small amount of electric energy, the system has the function of co-production of multiple kinds of energy, the performance coefficient is high when the electric energy is utilized for refrigerating and heating, and the whole system is simple in structure and low in manufacturing cost, and is economical.

The invention discloses a heating method and device of a dual-heat source heat pump. The device comprises a heat pump power unit, a condenser, a liquid reservoir, a dry filter, a throttling device, an air source evaporator, a condensed ice evaporator, an ice-water separator, a water make-up tank, a gas-liquid separator, a solenoid valve, a temperature sensor and a controller. In the invention, the two evaporators are switched with each other for operation according to the ambient temperature to form a dual-heat source heat pump device; by means of heat extraction from the ice coagulation process, the evaporating temperature in case of low ambient temperature is increased so as to obtain high average performance coefficient of the heat pump; part of water in the condensed ice evaporator issolidified into ice slurry, thus achieving good flow characteristics and high heat transfer coefficient; and the obtained ice slurry can be used by an external user. The invention has the advantages of efficient energy conservation in case of low ambient temperature, no frosting, high safety, wide application range and the like, and is convenient installation and operation.