1103 results about "Supercooling" patented technology

The invention discloses an air-cooled heat pump air conditioner which comprises a compressor, an outdoor coil, a heat exchanger, a main liquid line and supercooling devices, wherein the supercooling devices comprise two or three of a supercooling coil, an economizer and a liquid-vapor separator with a supercooling function, the supercooling devices are arranged on the main liquid line, and liquid state refrigerants which circulate in the main liquid line can achieve repeatedly the supercooling through the supercooling devices. According to the air-cooled heat pump air conditioner, the performance of cooling/heating circulation of the air-cooled heat pump air conditioner is effectively improved, so that the air-cooled heat pump air conditioner is stable and reliable in operation and energy saving in a low-temperature environment.

The invention relates to a phase-change energy-storage material which comprises the following components in percentage by mass: 75%-99% of an energy storage main body material, 0.1%-10% of a thickening agent, 0.2%-15% of a nucleating agent and 0.01%-8% of a reinforcing material, wherein the energy storage main body material comprises crystal water and salt; the thickening agent comprises one or more of an inorganic thickening agent, fibers, polyacrylates, polyurethanes and a natural polymer thickening agent; the nucleating agent comprises one or more of sodium pyrophosphate, sodium phosphate decahydrate, calcium sulfate dihydrate, potassium sulfate, potassium borate, barium hydroxide octahydrate, sodium phosphate dibasic dodecahydrate and sodium sulfate; the reinforcing material comprises one or more of metal and metal oxide powder, carbon materials, nanoparticles and foam materials. By selecting proper materials and ratio, the supercooling degree and the phase separation phenomenon are reduced and good circulating stability is achieved; especially the reinforcing material is added into a system to form a heat-conducting network so as to improve the heat conductivity of the material by more than two times.

The invention provides a mass and flow measuring method and a device of a refrigerant in a refrigerating system and a measuring instrument. The method comprises the steps of: obtaining an intake temperature of a first compressor, an exhaust temperature of a second compressor, an evaporation pressure, a condensation pressure, shell surface temperatures of the first and second compressors, a surrounding environment temperature, a total consumption power, a spraying temperature, a first supercooling temperature, a second supercooling temperature and an oil content of a refrigerant mixture; calculating corresponding first, second, third, fourth and fifth enthalpy values, enthalpy value differences and total heat exchange quantities of the first and second compressors with external environment according to the obtained data; and calculating the mass and the flow of the refrigerant in the refrigerating system according to the first, second, third, fourth and fifth enthalpy values, the enthalpy value differences, the total consumption power, the total heat exchange quantities and the oil content of the refrigerant mixture. The method realizes non-invasion and high-precision measurement of the mass and the flow of the refrigerant in the refrigerating system, prevents adverse effect on the refrigerating system in the measuring process, and improves the user experience.

The invention discloses a refrigerant flow control method and device for a multi-connected air conditioning system. The device comprises control modules; each control module is provided for each indoor unit of the multi-connected air conditioning system. Each control module for the corresponding indoor unit comprises a sensor unit and a master control panel; the sensor unit used for acquiring data of the indoor unit comprises a high pressure sensor, a return air temperature sensor, a supply air temperature sensor and a liquid pipe temperature sensor; the master control board is used for receiving user-set temperature and acquiring data from the sensor unit to calculate target supercooling degree and actual supercooling degree when each sampling period is up; a difference between the actual supercooling degree and the target supercooling degree is used as a supercooling degree difference; an opening signal of an electronic expansion valve is adjusted to control opening of the electronic expansion valve of the corresponding indoor unit according to a difference between the supercooling degree difference of the current sampling period and the supercooling degree difference of previous sampling period. Through the use of the refrigerant flow control method and device, heating effect of each indoor unit can be guaranteed and energy consumption can be avoided.

The present invention generally relates to improved medical devices, systems, and methods, with exemplary embodiments providing improved cooling treatment probes and cooling treatment methods and systems. In some embodiments, freezing of the skin may be desirable to effect the hypopigmentation of the skin of the patient. Generally, embodiments may limit supercooling of the skin of the patient during a cooling treatment. Additionally, embodiments may limit adverse side effects such as hyperpigmentation. It has been found that the freezing behavior (frequency and time to freeze) can be modified by adjusting the thermal parameters of the cooling applicator. Accordingly, in some aspects of the invention, a method of treating the skin may be provided where the thermal parameters of the cooling applicator are adjusted during treatment.

The invention relates to an air source heat pump phase change energy storage defrosting system with super cooling action. When the existing defrosting mode is used for defrosting by an air source heat pump unit, no low level heat source exists during the defrosting process, thus leading to the problems that the defrosting energy source is insufficient and the defrosting time is longer. Pipelines are used for connection between a compressor and a four-way reversing valve, between the compressor and a gas-liquid separator, between the gas-liquid separator and the four-way reversing valve, between the four-way reversing valve and an outdoor heat exchanger, between the outdoor heat exchanger and a capillary tube, between the capillary tube and a device for drying and filtering, between the device for drying and filtering and an indoor heat exchanger, and between the indoor heat exchanger and the four-way reversing valve respectively; and an energy storage heat exchanger is arranged on the pipeline between the device for drying and filtering and the indoor heat exchanger. In the invention, the supercooling is finished by a refrigerant and the phase change material uses the refrigerant to store afterheat, thus improving the performance of the unit, realizing the planeshift of energy, and providing sufficient low level heat source for defrosting.

The invention relates to the field of refrigeration control, in particular to a control method for achieving freeze prevention and long preservation of food through temperature control, refrigerationequipment and a computer readable storage medium. According to the method, quick cooling is performed under the low environment temperature firstly, and the quality of the food is maintained to the maximum extent; then segmented gradual cooling is performed, the food is promoted to enter a stable over-cooling state; when the food is frozen, continuous step-type temperature rise is performed immediately, and the food is prevented from being frozen; and through repeated cooling, temperature stabilizing and temperature rise, the temperature of the food is always kept below 0 DEG C and above the supercooling point of -10 DEG C in most of the time, and the preservation cycle is prolonged effectively.

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 provides a wall-mounted air conditioner indoor unit and a control method thereof. The air conditioner indoor unit comprises a plurality of cross-flow fans, and each cross-flow fan corresponds to an air outlet. The control method comprises the steps that indoor ambient temperature distribution is obtained at each preset time at intervals; then indoor ambient temperature distribution is compared with preset ambient temperature distribution, and at least one target air supplying area is obtained; and an air guiding device is adjusted, so that each cross-flow fan supplies air towardthe corresponding target air supplying area. According to the control method, the air supplying area with large difference between the indoor actual temperature and the preset temperature can be determined, then the air guiding device is adjusted, so that the cross-flow fans supply the air to the air supplying area with large temperature difference, and the temperature of the area is reduced/raised, so that the air supplying area reaches the preset temperature as soon as possible; and the temperature in all areas can become more balance, uneven indoor temperature and supercooling/overheating of the local area are avoided, and the user experience is improved.

To provide a refrigerating apparatus that can control the supercooling degree of liquid refrigerant irrespective of changes in circulating refrigerant amounts in a refrigeration cycle, a refrigerating apparatus includes a refrigeration cycle having one or more compressors or inverter compressor, a condenser, an expansion valve, and an evaporator; a liquid introduction circuit that guides decompressed refrigerant obtained by extracting one part of high pressure liquid refrigerant from the refrigeration cycle and decompressing, to a supercooling heat exchanger provided in the refrigeration cycle to perform heat transfer between the decompressed refrigerant and high pressure liquid refrigerant, and then introduces the refrigerant into refrigerant for intake into the compressors or inverter compressor or an intermediate pressure part of these compressors; a controller controlling shutdown of the compressors or driving frequencies of the inverter compressor based on suction pressure detection values with respect to pressure setting values for suction pressure of the compressors or inverter compressor; and a flow controller controlling the amount of high pressure liquid refrigerant flowing through the liquid introduction circuit based on the circulating volume of refrigerant in the refrigeration cycle.

The invention relates to a foam metal composite phase-change material and a preparation method thereof, and belongs to the technical field of phase-change energy storage materials. A crystallized hydrated salt-foam metal composite phase-change energy storage material is prepared by adopting the adsorption characteristic of a porous foam metal skeleton structure, and a vacuum argon filling state is kept in a preparation process, so that impurities are prevented from entering, and the quality of a product is ensured. The phase-change material is relatively uniformly and sufficiently distributed in a substrate of the foam metal skeleton material, and the shaping characteristic of the composite material is maintained under the combined action of a capillary force and surface tension of foam metal, so that the phase-change material does not leak easily in a phase-change process, and the preparation method of the phase-change material is simple and convenient, high in recombination rate and good in operability. The composite phase-change material has the advantages of high phase-change latent heat in unit volume, high heat storage and release rates, good heat-conducting property, lower supercooling degree, and the like; and the lower heat conductivity and supercooling problems existing after the crystallized hydrated salt phase-change material is applied for a long time are solved effectively.

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.

The invention relates to the field of refrigeration control, and in particular relates to a control method for realizing unfrozen long-term preservation of food by multistage control, refrigerating equipment and a computer readable storage medium. The control method for realizing unfrozen long-term preservation of food by multistage control comprises the steps: firstly, quickly reducing the temperature at a relatively low ambient temperature to keep the quality of food to the maximum extent, then gradually reducing the temperature in stages to prompt the food to enter a stable supercooled state, and simultaneously turning on an energy field which takes effect on water molecules in the food and prompts the water molecules to keep in a resonance state, thereby reducing the temperature of a supercooling point and prolonging the time of a supercooling stabilization stage; when the food appears to have phase change, entering a phase-change unfrozen stage to further prolong the supercoolingstabilization time; and when the food appears frozen, immediately carrying out continuous staged temperature increase to avoid freezing of the food. Through continuously repeating temperature reduction, temperature stabilization and temperature increase, the temperature of the food is kept at 0 DEG C or below most of the time or all the time, the supercooling point is kept at -10 DEG C or above and the preservation period is effectively prolonged. The energy field and temperature control are effectively combined and reasonably controlled to achieve better preservation effect and energy conservation.

The invention discloses a multi-split system. The multi-split system comprises an outdoor unit device, a shunting device and multiple indoor unit devices; the shunting device comprises a gas-liquid separator, a first heat exchange assembly, a first electronic expansion valve, a second heat exchange assembly and a second electronic expansion valve. The shunting device controls the first electronic expansion valve according to a preset medium voltage initial control target value and obtains the supercooling degree values and superheat degree values of the heating indoor unit devices and opening degree values of throttling elements in all the indoor unit devices, and if the opening degree value of the throttling element in any indoor unit device reaches the maximum opening degree, the shunting device adjusts the current medium voltage control target value according to the supercooling degree values and the superheat degree values of the heating indoor unit devices. The multi-split system can automatically adjust the medium voltage control target value according to the state parameters of operating heating indoor units and operating refrigerating indoor units, so that the simultaneous refrigerating and heating effect of the multi-split system is optimal.

The invention discloses an air conditioning system and a control method thereof. The air conditioning system comprises an outdoor unit and an indoor unit. The indoor unit comprises a first electronic expansion valve, a front heat exchanger, a second electronic expansion valve and a rear heat exchanger which are sequentially connected in series. The control method includes the following steps that the temperature difference value between the indoor environment temperature and a set temperature is acquired when a constant temperature dehumidification instruction is received, and the temperature difference value is judged; the air conditioning system is controlled to enter in a constant temperature dehumidification mode when the temperature difference value is smaller than a first temperature threshold value, and the outlet superheat degree of the rear heat exchanger and the front end supercooling degree of the second electronic expansion valve are acquired; and the opening degree of the first electronic expansion valve, the opening degree of the second electronic expansion valve and the wind gear of an inner draught fan are adjusted according to the outlet superheat degree of the rear heat exchanger, the temperature difference value and the front end supercooling degree of the second electronic expansion valve. By the adoption of the control method, it is guaranteed that frequent machine starting and stopping can be avoided while the indoor temperature and humidity meet the requirements, so that comfort is improved, and it is also guaranteed that the air conditioning system can save energy.

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.

The invention discloses a method for controlling an electronic expansion valves during multi-connected air conditioning unit heating. The method includes the following steps that firstly, the target air suction superheat degree Tr and the target supercooling degrees Tl of the expansion valves are set; secondly, whether the actual air suction superheat degree Ts-Tdef is equal to Tr or not is judged, if the actual air suction superheat degree Ts-Tdef is equal to Tr, the third step continues to be executed, and if the actual air suction superheat degree Ts-Tdef is not equal to Tr, the sixth step is executed; thirdly, whether the actual supercooling degrees tem-liq of the expansion valves are all in the Tl range or not is judged, if the actual supercooling degrees tem-liq of the expansion valves are all in the Tl range, the fourth step is executed, if the actual supercooling degrees tem-liq of the expansion valves are not all in the Tl range, the fifth step is executed, no adjustment is made, and the second step is executed; fifthly, when the actual supercooling degree tem-liq of a certain expansion valve is larger than the upper limit of T1, the valve is opened to a certain degree, when the actual supercooling degree tem-liq of a certain expansion valve is smaller than the lower limit of Tl, the valve is closed to a certain degree, and the second step is executed after adjustment is completed; sixthly, whether the actual supercooling degrees tem-liq of the expansion valves are all in the Tl range or not is judged, if the actual supercooling degrees tem-liq of the expansion valves are all in the Tl range, the seventh step continues to be executed, and if the actual supercooling degrees tem-liq of the expansion valves are not all in the Tl range, the eighth step is executed; seventhly, the step numbers of all the expansion valves are adjusted, and the second step is executed after adjustment is completed; and eighthly, when Ts-Tdef is larger than Tr, the expansion valves with tem-liq larger than the upper limit of Tl are opened to a certain degree, if Ts-Tdef is smaller than Tr, the expansion valves with tem-liq smaller than the lower limit of Tl are closed to a certain degree, and the second step is executed after adjustment. The method has the beneficial effects that a refrigerant is reasonably distributed, and a balance heating effect is achieved.

The invention discloses a multi-online system and a control method for a heating and throttling element of the multi-online system. The method comprises the steps that when the multi-online system runs in a pure refrigerating or main refrigerating mode, the first temperature at the position of an outlet of a second heat exchange flow path of a first heat exchanger is obtained, the first saturation temperature corresponding to pressure at the position of the outlet of the second heat exchange flow path of the first heat exchanger is obtained, and the superheat degree is calculated according to the first temperature and the first saturation temperature; the second temperature at the position of an outlet of a first heat exchange flow path of a second heat exchanger is obtained, the second saturation temperature at the position of the outlet of the first heat exchange flow path of the second heat exchanger is obtained, and the supercooling degree is calculated according to the second temperature and the second saturation temperature; and the aperture of the heating and throttling element is adjusted according to the superheat degree and the supercooling degree. According to the method, the heating and throttling element can be adjusted according to the superheat degree and the supercooling degree, the aperture of the heating and throttling element is made to be optimal, and therefore the system can obtain the low exhaust temperature and good refrigerating effect and is high in energy efficiency.

The invention relates to a multi-union variable frequency air conditioner based on a micro-channel heat exchanger and a control method thereof. Optimizing control is carried out on the compression ratio and discharge pressure of a compressor of the multi-union variable frequency air conditioner, and operation security and operation reliability of an air-conditioning system are improved. When the air-conditioning system is applied on high-temperature occasions or long piping occasions of scorching heat areas, on one hand, effective security features and long-term reliability of the system under wide load operation conditions are guaranteed, and meanwhile the refrigerant charge and the refrigerant cost are reduced; on the other hand, the system can obtain high refrigerating capacity and a proper refrigerant supercooling degree, and therefore user demands and application requirements are met.

The invention provides a supercooling device, which comprises a shell and tube type condenser comprising a supercooling tube area, an electronic expansion valve and a supercooler, wherein a refrigerant outlet of the shell and tube type condenser is communicated with an inlet of a first refrigerant channel through the electronic expansion valve, and is directly communicated with an inlet of a second refrigerant channel. In addition, the invention also provides an air conditioner comprising any supercooling device. Furthermore, the invention provides a method for controlling refrigerant flow in any air conditioner, which comprises the following steps of: detecting temperature and pressure of a gaseous refrigerant at the outlet of the first refrigerant channel of the supercooler; calculating superheat degree according to the detected temperature and pressure; and comparing the calculated superheat degree with the preset suction superheat degree, and determining whether to adjust the opening of the electronic expansion valve in the supercooling device according to the compared result. The supercooling degree of the refrigerant is improved and the refrigerating capacity of unit refrigerant is improved by means of the supercooling tube area and the supercooler.

The invention discloses a preparation method of a carbon-containing high-entropy alloy composite material. The method comprises the steps of (1) preparing high-entropy pre-alloyed powder, wherein thehigh-entropy pre-alloyed powder comprises at least four of metal elements of Fe, Co, Cr, Ni and Ni, and a C element; and (2) performing selective laser melting molding on the high-entropy pre-alloyedpowder; and performing following thermal treatment on the molded part to obtain the carbon-containing high-entropy alloy. According to the method, high-entropy alloys with outstanding plasticity, suchas Fe, Co, Cr and Ni, are used for preparing a substrate, so that the high plasticity remains after the selective laser melting molding; and meanwhile, an interstitial element C is introduced and issubjected to solid solution reinforcing, so that the yield intensity and the ultimate strength of the substrate can be obviously improved; the supercooling degree in the selective laser melting process is high, the interstitial element C can be uniformly dissolved into the substrate in a solid solution manner, and coarse and big carbide are not segregated and separated out, so that the plasticityof the material is ensured; a high-density (more than 99%) product is prepared through the selective laser melting mode.

The invention provides high-porosity porous ceramic and a preparation method thereof, relates to porous ceramic and a preparation method thereof, and aims to solve the problems that when the high-porosity porous ceramic is prepared by adopting the prior direct foaming technology, a slurry foaming process is separated from a foam solidification process, and the preparation process is complex. The high-porosity porous ceramic is provided with even spherical honeycomb pore structure units, wherein the pore walls are mutually communicated via porous windows; and the porosity can reach above 90 percent. The preparation method comprises the steps that: I, raw materials are weighed and ball-milled to obtain slurry; II, the slurry is placed in a vacuum chamber to be degassed; III, a supercooling point of the slurry is tested; IV, the slurry is cooled to obtain supercooling slurry; V, the supercooling slurry is decompressed, foamed and solidified with foam; VI, the solidified and foamed material is dried to obtain ceramic bisque; and VII, the ceramic bisque is sintered to obtain the high-porosity porous ceramic. The preparation method has the advantages that the slurry foaming process is organically combined with the foam solidification process, the technology is simple and the porosity of the prepared ceramic reaches above 90 percent. The preparation method is used for preparing the high-porosity porous ceramic.

Disclosed are heat storage microcapsules encapsulating a water-soluble heat storage material stably and certainly, heat storage microcapsules with high durability which prevent phase separation of an inorganic salt hydrate latent heat storage material, heat storage microcapsules which prevent supercooling of a latent heat storage material to exhibit stable heat history and a manufacturing method thereof. The heat storage microcapsules comprise a core covered with a shell, wherein the core contains (a) at least one water-soluble latent heat storage material selected from a salt hydrate and a sugar alcohol and (b) a polymer derived from a water-soluble monomer mixture of a water-soluble monofunctional monomer and a water-soluble multifunctional monomer, and the shell is composed of a hydrophobic resin.