648 results about "Subcooling" patented technology

The present invention provides a control method of an electronic expansion valve, the electronic expansion valve is provided in a refrigerant circulation loop of equipment, the circulation loop is also provided with an evaporator, characterized in that the control method includes following steps: S10: starting the electronic expansion valve to process initialization, setting the opening of the electronic expansion valve in a predetermined initial value; S20: after starting the predetermined time, determining the real superheat/subcooling of the electronic expansion valve according to the difference between the outlet temperature and the inlet temperature of the evaporator; S30: comparing the object superheat/subcooling with the real superheat/subcooling, determining the optimal opening range of the electronic expansion valve; S40: adjusting the opening of the electronic expansion valve to the optimal opening range. The invention realizes the automatic control of refrigerant volume and throttle degree of equipment, and capable of adapting the working condition to control automatically, so as to protect the optimal state in the system operation ,ensuring credibility and safety operation.

First, a system for providing liquid refrigerant subcooling, subsequent to that subcooling accomplished by the primary condenser of an air conditioner or heat pump, by means of evaporative cooling utilizing the condensate water of said air conditioner or heat pump system and/or some other water supply to wet the surface of the subcool heat exchanger and then passing the cold, dry building exhaust air required for good indoor air quality across the wetted surface of the subcool heat exchanger. Said exhaust air could be used after first undergoing a sensible heat exchange with the incoming make up air. Said subcooling providing for an increased refrigeration capacity, and efficiency of the system. Secondly, a system for providing hot gas discharge refrigerant precooling before said hot gas passes into the primary condenser of an air conditioner or heat pump, by means of evaporative cooling utilizing the condensate water of said air conditioner or heat pump system and/or some other water supply to wet the surface of the precool heat exchanger and then passing the cold, dry building exhaust air required for good indoor air quality across the wetted surface of the precool heat exchanger. Said precooler providing lower power consumption of the compressor, lower head pressure, increased mass flow of the refrigerant and improved efficiency of the primary condenser of the air conditioning or heat pump system. Said exhaust air could be used after first undergoing a sensible heat exchange with the incoming make up air on either the subcooler or precooler. Finally, a combination subcooler and precooler system where the cold dry exhaust air is first used to evaporatively subcool the liquid refrigerant in the water wetted subcooler and then subsequently used to conductively cool the hot gas refrigerant passing through a dry surface precooler or alternately used to evaporatively cool the wetted surface of the precooler thereby evaporatively precooling the hot gas refrigerant passing through the precooler.

A system is provided and may include a compressor having a motor and a refrigeration circuit including an evaporator and a condenser fluidly coupled to the compressor. The system may further include a first sensor producing a signal indicative of one of current and power drawn by the motor, a second sensor producing a signal indicative of a saturated condensing temperature, and a third sensor producing a signal indicative of a liquid-line temperature. Processing circuitry may processes the current or power signal to determine a derived condenser temperature and may compare the derived condenser temperature to the saturated condensing temperature received from the second sensor to determine a subcooling associated with a refrigerant charge level of the refrigeration circuit.

The present invention is a two-phase liquid cooling system that cools a plurality of electronic components connected in parallel. A pump delivers a cooling fluid, as a liquid, to a supply manifold wherein it splits into distinct branch lines. Preferably, the branch lines feed coolant to individual spray modules. The liquid coolant removes heat from the components to be cooled through evaporation. The resulting liquid and vapor mixture exits the spray modules via return branches. Each individual return branch feeds into a return manifold wherein the manifold is sized sufficiently for the separation of liquid and vapor under the influences of gravity. In addition, a heat exchanger is located within the return manifold and provides for the condensation of vapor. The heat exchanger may also provide liquid subcooling.

A cryogenic medical device for delivery of subcooled liquid cryogen to various configurations of cryoprobes is designed for the treatment of damaged, diseased, cancerous or other unwanted tissues. The device is a closed or semi-closed system in which the liquid cryogen is contained in both the supply and return stages. The device is capable of generating cryogen to a supercritical state and may be utilized in any rapid cooling systems. As designed, the device comprises a number of parts including a vacuum insulated outer dewar, submersible cryogen pump, baffled linear heat exchanger, multiple pressurization cartridges, a return chamber, and a series of valves to control the flow of the liquid cryogen. The cryogenic medical device promotes the subcooling to any external cryogenic instrument.

The invention discloses silicon dioxide coated phase-change microcapsules and a preparation method and an application thereof, wherein the phase-change microcapsules include a core material and a wall material; the core material includes a phase-change material, and the wall material is silicon dioxide; the enthalpy value retention rate of the silicon dioxide coated phase-change microcapsules is 20-99%; the average particle size of the microcapsules is 0.1-100 microns. Through a sol-gel reaction on an emulsion interface, the silicon dioxide coated phase-change material is obtained by one step; no toxic substances are generated in the preparation process, so the preparation process is green and environmentally friendly; the prepared phase-change energy-storage microcapsules are high in coating rate and low in damage rate, the supercooling degree of the phase-change material is effectively reduced, the obtained phase-change material has no volatile gases, the use is safe, and an application scope is expanded; the preparation method has the advantages of simple process, low cost, cheap and easily obtained used raw materials, and easily achieved industrialization. The phase-change energy-storage microcapsules can be widely applied to the fields of textile, building energy conservation, electronic part and component thermal management, waste heat recovery and the like.

A refrigeration cycle device 100 where a combustible refrigerant circulates includes a bypass pipe 5 that is connected so that part of the refrigerant that flows through a circulation pipe extending from a condenser 2 to a flow control valve 3 bypasses the flow control valve 3 and an evaporator 4; a bypass flow control valve 6 that controls the amount of the refrigerant flowing through the bypass pipe 5; a heat exchanger 7 that allows heat exchange between the refrigerant that flows through the bypass pipe 5 after flowing out of the bypass flow control valve 6 and the refrigerant that flows through the circulation pipe after flowing out of the condenser 2; and a subcooling degree sensor T73 that detects the subcooling degree of the refrigerant at the inlet of the flow control valve 3. At least either the flow control valve 3 or the bypass flow control valve 6 is controlled so that the subcooling degree of the refrigerant at the inlet of the flow control valve 3 is equal to or greater than or a predetermined value.

The invention discloses a composite phase change heat storage material and a preparation method thereof. The composite phase change heat storage material is characterized by comprising the following materials in parts by weight: 39.4-40.3 parts of saturated sodium sulfate decahydrate solution, 0.8-1.2 part of nucleating agent, 1.2-2 parts of thickening agent, 23.6-24.0 parts of solid paraffin, 1.2-2.4 parts of heat-conducting filler, 17.8-18.6 parts of expanded perlite and 13.6-13.9 parts of distilled water, wherein a 40 DEG C saturated sodium sulfate decahydrate solution containing the nucleating agent and the thickening agent is adsorbed into the expanded perlite by employing a vacuum absorption method and then is sealed by employing industrial solid paraffin after adsorption is finished, and the heat-conducting filler is added in the sealing process. The composite phase change heat storage material has the advantages that after being modified and micro-packaged, the composite phase change heat storage material has low supercooling degree, the solution is uniform and not layered during solid-liquid phase change, the performance is stable, the repeatability is high, the service life is prolonged, and the composite phase change heat storage material can be widely applied to actual building energy conservation engineering.

The invention discloses a backheating method and a backheating structure for a heat pump air conditioner, which can improve the performance of the air conditioner. The backheating structure comprises heat exchangers A and B, a compressor, and a throttling element connected between the heat exchangers A and B, wherein the heat exchanger B is connected with the compressor by an air suction pipe of the compressor; and a higher-temperature coolant in the throttling element performs heat exchange with a lower-temperature coolant in the air suction pipe of the compressor. In the backheating method and the backheating structure, the temperature of the coolant in the throttling element can be reduced by performing backheating in a throttling process, thereby retarding the evaporation of the coolant and the change of the dryness of the coolant, making more stable the flow regime of the coolant and reducing inevitable loss; and the dryness of the coolant at an outlet of the throttling element is reduced, namely, the degree of subcooling of the air conditioner is increased, so the cooling capacity of the air conditioner can be improved. The backheating method and the backheating structure for the heat pump air conditioner can improve the cooling or heating performance of the heat pump air conditioner; and the backheating structure is simplified to a certain extent so as to be convenient to manufacture and save the cost.

A cryogenic medical device for delivery of subcooled liquid cryogen to various configurations of cryoprobes is designed for the treatment of damaged, diseased, cancerous or other unwanted tissues. The device is a closed or semi-closed system in which the liquid cryogen is contained in both the supply and return stages. The device comprises a number of parts including a vacuum insulated outer dewar, submersible cryogen pump, baffled linear heat exchanger, return chamber, and a series of valves to control the flow of the liquid cryogen. The cryogenic medical device promotes the subcooling to any external cryogenic probe.

The invention provides a preparation method of a graphite foam (GF) or expanded graphite (EG)/inorganic hydrated salt composite solid-solid phase-change energy storage material. The method comprises the following steps: adding 6-10 wt% of EG or GF into an inorganic hydrated salt phase-change material, adding distilled water which is 2 times by mass of the EG or GF, adding a corresponding nucleator, and carrying out vacuum adsorption in a water bath with the temperature of 5-20 DEG C higher than hydrated salt phase-change temperature for 1-3 hours while continuously stirring and vibrating or carrying out ultrasonic vibration. The composite solid-solid phase-change energy storage material thoroughly solves the problem of phase separation of the inorganic hydrated salt, has the characteristics of low degree of supercooling, favorable heat-conducting property, small phase-change volume change, stable performance and no leakage, and is convenient for packaging.

A system for providing liquid refrigerant subcooling, subsequent to that subcooling accomplished by the primary condenser of an ice machine, by means of utilizing cold harvest and/or melt water discharge from said ice machine. The subcooler is connected in fluid communication with the output of a pump that pumps stored ice machine discharge water to directly flow through the subcooler from a bottom portion to a top portion in a counter-flow direction and then to discharge such that the subcooler utilizes the pumped and flowing cold discharge water from the ice machine for providing maximum available subcooling to the liquid refrigerant of said ice machine

The invention discloses a calcium chloride hexahydrate phase change energy storage material composition, which comprises calcium chloride hexahydrate, a nucleating agent, a thickener, other functional additives and the like. The phase change temperature of the composition is 23 to 25 DEG C, the degree of supercooling is less than 3 DEG C, and the latent heat of phase change is more than 180kJ/kg. The composition has high phase change stability, passed 3,000 times of tests of cold and hot circulation and can keep the uniform distribution of the nucleating agent in a short time period.

The invention provides a control method of a heat pump system. The control method comprises steps as follows: the liquid pipe temperature at an outlet of a condenser, the discharge pressure of a compressor, the high-pressure saturation temperature corresponding to the discharge pressure and the discharge temperature of the compressor are acquired; the actual super-cooling degree is calculated according to the high-pressure saturation temperature and the liquid pipe temperature at the outlet of the condenser; the actual discharge superheat degree is calculated according to the discharge temperature and the high-pressure saturation temperature; the target super-cooling degree is acquired according to the actual discharge superheat degree of the compressor; whether the actual super-cooling degree is larger than the target super-cooling degree or not is judged, and if the actual super-cooling degree is larger than the target super-cooling degree, the actual super-cooling degree is reduced by adjusting the opening degree of a throttling device; and if the actual super-cooling degree is not larger than the target super-cooling degree, the actual super-cooling degree is increased by adjusting the opening degree of the throttling device. The invention further provides the heat pump system. With the control method of the heat pump system and the heat pump system, the accuracy of gas filling liquid detection and judgment of the system is improved, and the compressor is prevented from producing liquid impact, so that long-time reliable running of the compressor can be guaranteed.

The invention provides an air-conditioning system with a subcooler, a temperature sensor is arranged on a pipeline between a subcooler liquid pipe and an indoor unit, a pressure sensor is arranged at the exhaust port of a compressor, and the temperature sensor and the pressure sensor are connected on a master controller. The invention also provides a method for judging whether the refrigerant perfused amount in the air-conditioning system with the subcooler is proper, comprising the following steps: calculating the difference between the high voltage condensation temperature of refrigerant at the exhaust port of the compressor and the temperature of the refrigerant at the liquid outlet of a high voltage side of the subcooler, namely obtaining an actual subcooling degree; and comparing the difference of the actual subcooling degree and a target subcooling degree with a judgment value, and judging whether the refrigerant perfused amount is proper according to the comparing result. The invention overcomes the problem that the refrigerant perfused amount can not be judged in the existing air-conditioning system with a subcooler, can ensure circulated operation of the air conditioning system with a proper refrigerant, improves the operation efficiency and service life of a unit and ensures the use effect for users.

The present invention is a hand held gauge for use with refrigeration systems. The gauge includes a service port connector, a display screen, and user interfacing buttons. The gauge also includes electronic storage of the pressure-to-saturation temperature data for different refrigerants. The gauge allows for the measuring of temperature and pressure of refrigeration systems. After a user inputs a refrigerant type, the gauge uses the pressure and the saturation data to determine the saturation temperature. The saturation temperature is compared to the measured temperature to get the superheat or subcooling. These results may all be displayed on the display screen.

The invention provides a refrigerant flow regulating system of a multi-connected air-conditioning heat exchanger. The opening of an electronic expansion valve at the outlet of the heat exchanger is controlled, and the supercooling degree or superheating degree at the outlet of each heat exchanger is detected and controlled so as to regulate the refrigerant flow of each heat exchanger. The regulating method comprises the following steps: (1) starting the system; (2) acquiring data; (3) calculating the temperature difference; (4) determining whether the temperature difference exceeds the range; (5) calculating the variation value of the electronic expansion valve; and (6) finishing the regulation and operating normally. According to the invention, the refrigerant flow of each heat exchanger is regulated effectively, and the whole refrigerating effect of the air-conditioning system is improved.

A multi-flow subcooling condenser, comprising: a pair of headers, a plurality of flat heat transfer tubes connecting the pair of headers, and corrugated fins arranged alternately with the heat transfer tubes. The condenser includes a refrigerant condensing core section and a subcooling cooling core section. The lower part of one of the headers of the condenser, which serves as a liquid tank to collect liquid refrigerant for delivery to the subcooled cooling core section, also has a desiccant. A plug mechanism is provided to the end of the desiccant including the manifold, in the plug mechanism the plug can be arbitrarily fixed or removed, whereby the desiccant can be replaced.

A method for preparing nanoparticle-enhanced refrigerant hydrate phase-change cold storage refrigerants, using the solubilization effect of compound surfactants, dissolving refrigerants in water to prepare thermodynamically stable refrigerant microemulsions, and then dispersing nanoparticles In the refrigerant microemulsion, a refrigerant hydrate phase-change cold storage working substance strengthened by nanoparticles is prepared. By stably dispersing nanoparticles in the refrigerant microemulsion system to enhance heat and mass transfer, increase the reaction interface, and induce heterogeneous nucleation, thereby significantly reducing the induction time and subcooling degree of hydrate formation, effectively achieving crystallization effect. The product of the invention can be widely used in fields such as peak shifting of electric power, building energy saving, cold storage air conditioner, refrigeration and preservation of agricultural products and biological products, high and low temperature cold storage and refrigerated logistics, etc., and can achieve the purpose of effective cold storage and release of cold and rational use of energy.

First, a system for providing liquid refrigerant subcooling, subsequent to that subcooling accomplished by the primary condenser of an air conditioner, refrigeration or heat pump system, by means of evaporative cooling utilizing the condensate water of said air conditioner, refrigeration or heat pump system and/or some other water supply to wet the surface of the subcool heat exchanger and then passing the cold, dry building exhaust air required for good indoor air quality (or outside air) across the wetted surface of the subcool heat exchanger or by using building exhaust air only to conductively subcool. Said exhaust air could be used after first undergoing a sensible heat exchange with the incoming make up air. Said subcooling providing for an increased refrigeration capacity and efficiency of the system. Secondly, a system for providing hot gas discharge refrigerant precooling before said hot gas passes into the primary condenser of an air conditioner, refrigeration or heat pump system, by means of evaporative cooling utilizing the condensate water of said air conditioner, refrigeration or heat pump system and/or some other water supply to wet the surface of the precool heat exchanger and then passing the cold, dry building exhaust air required for good indoor air quality(or outdoor air) across the wetted surface of the precool heat exchanger. Said precooler providing lower power consumption of the compressor, lower head pressure, increased mass flow of the refrigerant and improved efficiency of the primary condenser of the air conditioning, refrigeration or heat pump system. A combination subcooler and precooler system where the cold dry building exhaust air (or outdoor air) is first used to evaporatively subcool the liquid refrigerant in the water wetted (or dry) subcooler and then subsequently used to conductively cool the hot gas refrigerant passing through a dry surface precooler or alternately used to evaporatively cool the wetted surface of the precooler thereby evaporatively precooling the hot gas refrigerant passing through the precooler. Also, a system for providing suction gas postheating after the primary evaporator but before the refrigerant is drawn back into the compressor of a heat pump operating in the heating mode, by passing relatively warm building exhaust air through a postheat heat exchanger thereby adding normally wasted heat back into the heat pump system. Finally, a combination subcooler and postheater system whereby building exhaust air(or outdoor air) is first used to conductively subcool the liquid refrigerant and then the subcooler warmed building exhaust air (or outdoor air) is subsequently used to conductively warm the refrigerant passing through the postheater thereby adding normally wasted heat back into a heat pump system operating in the heating mode.

The invention discloses a subcooled oil cooler and a novel economizer screw machine refrigeration cycle system. The subcooled oil cooler is a device in which an oil cooler and a liquid subcooler are placed in the same container. The system comprises that: a compressor is connected with an oil separator; the oil separator is connected with a condenser; the condenser is connected with a reservoir; the reservoir has two paths to be connected with two interfaces of the subcooled oil cooler; air outlets of the oil content are connected with an interface of the subcooled oil cooler and an inlet of a two-position three-way valve respectively; an air outlet of the subcooled oil cooler is connected with the other inlet of the two-position three-way valve; the outlets of the two-position three-way valve are connected with the compressor respectively; a gas outlet of the subcooled oil cooler is connected with a middle cavity of the compressor; the other gas outlet of the subcooled oil cooler is successively connected with a throttling valve and an evaporator; the evaporator is connected with the gas content; and the gas content is connected with an air suction port of the compressor. The system guarantees high-efficiency heat exchange of a heat exchanger, can also provide undercooling for refrigerants, guarantees the subcooling degree of the liquid, and can meet the requirement of liquid supply in a certain long distance.