41results about How to "Guaranteed subcooling" patented technology

The invention discloses a control method for lowering of an indoor unit of an air conditioner. The air conditioner comprises an outdoor unit and an indoor unit. The indoor unit comprises an indoor unit expansion valve. The outdoor unit comprises a compressor and an outdoor heat exchanger. A subcooler is further arranged between the outdoor heat exchanger and the indoor unit expansion valve and comprises a subcooler expansion valve. The control method comprises the steps that S10, the air conditioner is controlled to start up in a refrigeration mode; S20, the aperture EXV1 of the subcooler expansion valve and the aperture EXV2 of the inner unit expansion valve are controlled, accordingly, the system supercooling degree is established, and the superheat degree of the indoor unit is guaranteed. By means of the control method, cavitation noise of the indoor unit during air conditioner refrigeration start running can be lowered, and then the problem of liquid flow noise of the indoor unit can be effectively solved. The invention further discloses a multi-split air conditioner.

The invention provides a preparation method of a degradable gas hydrate efficient accelerant. The accelerant is prepared by three substances including rhamnolipid, sodium carbonate (NaCO3) and sodium chloride (NaCl) according to a certain ratio. The using mass concentration of the accelerant is 0.05-2%. The preparation method can be applied to generation acceleration research of the gas hydrate, greenhouse gas collection such as CO2 by a hydration method and fields such as gas hydrate separation technology. The preparation method is processed in a high-pressure reactor; the gas is provided by a high-pressure gas cylinder; the gas is introduced into the reactor by a pneumatic booster pump; the temperature and the pressure are displayed by a transmitter; and the reaction situation is recorded in real time by a data acquisition system through a camera. As a degradable biological surfactant used for the accelerant is very environment-friendly, the accelerant does not influence the environment and is low in cost, low in dosage, good in the acceleration effect, and beneficial to hydrate industrial production.

The invention discloses a thermal siphon oil cooling system which comprises a thermal siphon liquid accumulator, a condenser, a high pressure liquid accumulator, a condenser liquid outlet pipe and a thermal siphon liquid accumulator overflow pipe, wherein an overflow port of the thermal siphon liquid accumulator and the high pressure liquid accumulator are communicated through the thermal siphon liquid accumulator overflow pipe. One end of the condenser liquid outlet pipe is connected with a liquid outlet of the condenser, and the other end of the condenser liquid outlet pipe is connected with the thermal siphon liquid accumulator overflow pipe. The thermal siphon oil cooling system has the advantages of being simple in structure, convenient to reform, safe, reliable and capable of saving energy.

The invention relates to a two-stage heat exchanger. According to the two-stage heat exchanger, the interior of a shell is divided into a first-stage heat exchange cavity and a second-stage heat exchange cavity through a partition plate, the first-stage heat exchange cavity communicates with the second-stage heat exchange cavity through a communicating channel on the partition plate, a first-stage heat exchange pipe is arranged in the first-stage heat exchange cavity, and a second-stage heat exchange pipe is arranged in the second-stage heat exchange cavity. When the two-stage heat exchanger is used as a condenser and the supercooling degree of the first-stage heat exchange pipe is small, the second-stage heat exchange pipe can be put into use together; firstly, superheated refrigerant steam in the first-stage heat exchange cavity rapidly exchanges heat with cooling liquid in the first-stage heat exchange pipe and then is condensed into liquid refrigerant; then, the liquid refrigerant enters the second-stage heat exchange cavity, the liquid refrigerant in the second-stage heat exchange pipe is evaporated or saturated refrigerant steam absorbs heat of the liquid refrigerant, and therefore the refrigerant in the second-stage heat exchanger can be sufficiently supercooled before throttling, the supercooling degree of a refrigerant system is kept, the pressure of the refrigerant system and loads on a compressor are reduced, and overall energy efficiency of a unit can be improved.

The invention provides an undercooling type condensation heat exchanger and a heat exchange method thereof. The condensation heat exchanger comprises a condenser body, an in-tube cooling unit and an undercooling unit. The condenser body comprises a cylinder unit, a first end enclosure and a second end enclosure, and the first end enclosure and the second end enclosure are arranged on two sides of the cylinder unit respectively. The first end enclosure is provided with a steam inlet and a steam outlet. The cylinder unit comprises a first cylinder and a second cylinder which are separated from each other through a gas-liquid separator. A separation plate is arranged in the first end enclosure, the in-tube cooling unit is arranged in the cylinder unit, and the undercooling unit is arranged in the second end enclosure. A steam heat exchange process in heat exchange tubes is divided into two processes in the two cylinders by the separation plate, and flow velocity of steam in each process is kept uniform basically; through heat exchange of the undercooling unit and the in-tube cooling unit, reliability in heat exchange is guaranteed, and application range of the condensation heat exchanger is widened.

The invention discloses a liquid hydrogen supercooling degree acquisition system for a space launching site. The system involves a liquid hydrogen storage tank, wherein a top pressurization opening ofthe liquid hydrogen storage tank is connected with an outlet of a high-pressure helium tank through a valve; a bottom outlet of the liquid hydrogen storage tank is connected with a liquid hydrogen side inlet of a helium-hydrogen heat exchanger through a circulating pump, and a liquid hydrogen side outlet of the helium-hydrogen heat exchanger is connected with a top reflux inlet of the liquid hydrogen storage tank through a reflux check valve; a helium side outlet of the helium-hydrogen heat exchanger is connected with a helium side inlet of a liquid hydrogen bath-type heat exchanger through acold helium compressor, and a helium side outlet of the liquid hydrogen bath-type heat exchanger is connected with a helium side inlet of the helium-hydrogen heat exchanger through a throttling valve; and a liquid hydrogen inlet of the liquid hydrogen bath-type heat exchanger is connected with the bottom outlet of the liquid hydrogen storage tank through a float regulating valve, and a hydrogen outlet of the liquid hydrogen bath-type heat exchanger is emptied through a hydrogen discharge valve. According to the system, a large number of liquid hydrogen cold sources existing in the launching site are used for precooling, and large-scale on-site preparation of the launching site with the large supercooling degree of liquid hydrogen can be achieved in combination with the cold helium compressor; and the equipment investment and transformation cost is low, and engineering implementation is easy.

The invention provides a tubular condensation heat exchanger and a heat exchange method thereof. The condensation heat exchanger comprises a condenser body, a pipe-in cooling unit and a supercooling unit, wherein the condenser body comprises a tube body unit, a first seal head and a second seal head, the first seal head and the second seal head are arranged on both sides of the tube body, a steam inlet is formed in the first seal head, and the tube body unit comprises a first tube body, a second tube body and a third tube body; the first tube body is separated from the second tube body through a first gas-liquid separator, and the second tube body is separated from the third tube body through a second gas-liquid separator; the pipe-in cooling unit is arranged in the tube body unit, and the supercooling unit is arranged on the second seal head. The tubular condensation heat exchanger disclosed by the invention effectively uses a heat exchange area, quickly drains condensate, avoids the phenomena that the condensate is accumulated and two-phase flows are generated, and obviously increases the heat transfer coefficient.

The invention discloses a machine room air conditioner synchronizing supercooling and superheating. The machine room air conditioner comprises a compressor, a condenser assembly, an expansion valve and an evaporator assembly which are all in sequential connection, wherein an outlet of the evaporator assembly is connected with an inlet of the compressor to form a refrigeration circulation loop. The condenser assembly comprises multiple branch condensing coils, a high-pressure liquid storage tank, a liquid collection device, a supercooling coil and a condenser fan, wherein the supercooling coil is arranged in a position with the best heat exchange effect in the condensing assembly and is parallel with the multi-branch condensing coil, an outlet of a branch condensing coil with the worst condensing effect in the multiple branch condensing coils is connected with an inlet of the high-pressure liquid storage tank, an outlet of the high-pressure liquid storage tank and outlets of other branch condensing coils are together connected with an inlet of the liquid collection device, and an outlet of the liquid collection device is connected with an inlet of the expansion valve though the supercooling coil. The machine room air conditioner effectively resolves the problems of loss of the obtained degree of the supercooling, avoids wet compression of the compressor, and can improve refrigeration performance and working stability of the machine room air conditioner.

The invention relates to the field of cascade refrigeration, and provides a four-stage cascade refrigerating device with a multi-stage water cooler. The four-stage cascade refrigerating device cascades by four pieces of relatively independent refrigerating circulation. A water cooler is independently arranged on a second-stage compressor high-temperature gas exhaust pipeline, a third-stage compressor high-temperature gas exhaust pipeline and a fourth-level compressor high-temperature gas exhaust pipeline of the cascade refrigerating circulation, cheap cooling water which can be easily obtainedand is out of a system is introduced, and therefore, a refrigeration quantity and refrigeration efficiency can be effectively improved. Meanwhile, a precooling heat regenerator and an undercooling heat regenerator are configured in a second-stage high-temperature pipeline, a third-stage high-temperature pipeline and a fourth-stage high-temperature pipeline of the cascade refrigerating circulation, so that refrigeration efficiency can be improved, and the safe operation of a compressor can be guaranteed.

The invention belongs to the technical field of aluminum alloy pipe machining, and discloses an aluminum alloy material, an aluminum alloy hollow pipe and a preparation method of the aluminum alloy hollow pipe. The aluminum alloy material comprises the following components: 2.0 to 2.5 percent of Mg, 0.1 to 0.5 percent of Mn, 0.01 to 0.05 percent of Ti, 0.15 to 0.25 percent of Si, less than or equal to 0.2 percent of Fe and the balance of Al. The aluminum alloy hollow pipe is prepared in a continuous casting mode, traditional extrusion and stabilizing annealing steps are reduced, the mechanical property of the prepared pipe meets the use requirement, and the productivity is improved; and the heating system and the casting system adopt forced heating and forced cooling systems, so that the temperature gradient of a solid-liquid surface is ensured, the degree of supercooling is ensured, alloy grains are refined, and compared with an aluminum alloy pipe prepared by a semi-continuous casting method, the mechanical property is improved by 10%-15%.