35results about How to "Increase boiling heat transfer coefficient" patented technology

The invention relates to a power-cooling co-supply system for waste heat recovery of a ship gas turbine, and belongs to the technical field of ships and energy saving. The ship gas turbine waste heat recovery power and cooling system includes ORC liquid supply pump, ORC steam generator, ORC superheater, ORC turbine, ejector, refrigeration evaporator, condenser, low pressure liquid supply pump, low pressure preheating generator, low pressure steam generator, low pressure superheater, steam drum, mixer, regulating valve, shut-off valve and throttle valve. The system makes full use of the characteristics of the temperature-changing phase transition of the zeotropic mixture and the large difference in the thermodynamic properties of the vapor-liquid two-phase in equilibrium to realize the temperature matching of the heat exchange fluid and the "automatic" high-low temperature two-stage circulating working fluid "adaptation", which reduces the total irreversible loss of the system and improves the overall efficiency of the compound cycle.

A high-hole-density through hole metal foam electronic element heat-exchanging device based on impact jet flow comprises a heat-exchanging substrate, through hole metal foam sintered on the heat-exchanging substrate, a cooling water inlet pipe and a water drainage pipe, wherein main bodies of the cooling water inlet pipe and the water drainage pipe are vertical arranged at intervals, heat-exchanging parts at the bottoms of the two water pipes are provided with the through hole metal foam, and a heat-exchanging structure is arranged in the position wherein the through hole metal foam is connected with the water drainage pipe. According to the high-hole-density through hole metal foam electronic element heat-dissipation device based on the impact jet flow, the through hole metal foam is used for separating the flowing route of supplement liquid and the escape route of bubbles, and largely reduces the resistance when the bubbles escape. The heat-exchanging device is high in heat-exchanging efficiency, and is capable of being widely used in the heat-exchanging field of electronic elements.

A metal alloy material, which contains 2-10wt% of Ni, 10-20wt% of Zn, 5-10wt% of Sn, the balance of Cu and unavoidable impurities. The material provided by the invention can be used to prepare copper-nickel alloy surface porous tubes. The metal alloy material provided by the invention can make the porous layer on the surface of the porous tube achieve metallurgical bonding with the base tube at a suitable temperature, which can not only avoid damage to the performance of the base tube at an excessively high sintering temperature, but also solve the problem of excessively low sintering temperature. Problems such as poor bonding strength of the porous layer, poor corrosion resistance, and short life occur at the sintering temperature.

The invention provides a self-excitation type phase change thermal control cooling system. The system comprises a heat taking evaporation module and a condensation cooling module, wherein a closed cavity for filling a working medium is formed therebetween; the heat taking evaporation module is positioned at one end part of the closed cavity, and consists of a heat taking baseplate and an evaporation end surface microstructure; and the evaporation end surface microstructure is arranged on an inner end surface of the heat taking baseplate. The system further comprises a capillary micro straight groove and a liquid accumulation and liquid supply groove ring; the condensation cooling module comprises a condensation side part and a condensation top plate; the condensation side part is positioned at the side edge of the closed cavity; the condensation top plate is positioned at the other end part of the closed cavity; and the inner end surfaces of the condensation side part and the condensation top plate are combined surfaces having a film liquid area and a dropping liquid area. As the capillary micro straight groove having high-strength phase change heat taking under fine scale is introduced, the critical heat flux density and the heat exchange coefficient are promoted, and the heat exchange capacity of a heat end is strengthened; and meanwhile, the drop type condensation is built at a condensation end for timely and effectively falling and updating drops, so that the condensation heat exchange effect is reinforced and promoted.

The invention relates to a medium-low temperature waste heat driven flash-injection-absorption combined cooling, heating and power supply system, which belongs to the technical field of new energy and energy saving. The medium and low temperature waste heat-driven flash-injection-absorption combined cooling, heating and power system includes superheater, waste heat heater, flash evaporator, rectifier, expander, cooling heat exchanger, booster compressor, injection Ejectors, regenerators, absorbers, absorption pumps, solution pumps, throttle and shut-off valves. This system can realize combined cooling, heating and power supply or combined heating and power supply according to the needs of users. No matter whether the compound cycle system constructed by the present invention is operated under the combined cooling, heating and power supply or combined heating and power supply mode, only a small part of the external heat loss can be realized. Maximum utilization of energy.

The invention discloses an improved gravity assisted heat pipe radiator used for a high-power LED, which comprises an improved gravity assisted heat pipe and radiating fins, and is characterized in that the improved gravity assisted heat pipe consists of a flat-plate-shaped evaporation section and a cylindrical condensation section, wherein the evaporation section is directly connected with an LED circuit baseplate; the condensation section is connected with the radiating fins; a heat conduction column is arranged on the inner wall of the lower end of the evaporation section; a reflux tank channel is axially arranged on the inner wall of the condensation section; the interior of the heat pipe is vaccumized and is filled with a heat-conducting medium; and the inner wall of the heat pipe is sandblasted for heat transfer enhancement. The improved gravity assisted heat pipe radiator used for the high-power LED transmits the heat to the radiating fins rapidly by the circulating convection with the participation of gravity, and has the benefits of flexibility, convenience, simplification, low cost, high start speed, capability of accelerating the radiating rate with the temperature rising of the high-power LED, and the like.

The invention discloses a reboiler which comprises a cylinder and a plurality of heat exchange tubes, wherein a material inlet and a material outlet are arranged at two ends of the cylinder respectively; a steam inlet is arranged on the cylinder on the side of the material outlet; and a condensate outlet is arranged on the cylinder on the side of the material inlet. According to the reboiler, a porous layer is processed on inner surfaces of heat exchange tube substrates and the porous layer has a heating surface with increased roughness so as to form an artificial evaporating core, so that the heat transfer efficiency of the heat exchange tubes is increased. Meanwhile, longitudinal grooves are processed on the outer surfaces of the heat exchange tube substrates, circular bulges are arranged in the longitudinal grooves, longitudinal nicks are arranged on a teeth part, the thickness of a liquid film is reduced by utilizing a surface tension and then the condensation effect on the exteriors of the heat exchange tubes is improved. According to the invention, the total coefficient of heat transfer of the reboiler is above 3 times of that of a light tube reboiler; anti-scaling capacity of boiling sides of the heat exchange tubes is increased; the dirt deposition rate is less than that of a smooth tube, so that the cleaning period of the reboiler is prolonged.

The invention discloses a layered micro-nano composite structure for enhancing boiling heat transfer and a processing method thereof. The layered micro-nano composite structure includes a silicon substrate, a columnar microstructure grown on the silicon substrate, and a surface around the top surface of the columnar microstructure. Nanoholes. The composite structure is based on the columnar microstructure arranged in an array, which can effectively improve the liquid replenishment rate in the heat flux density region; the nano-cavities generated around the top surface of the columnar microstructure can effectively improve the vaporization core density, thereby increasing the Boiling heat transfer coefficient. The nano-scale holes are only distributed around the top surface of the columnar microstructure, which can effectively prevent the large-area lateral merger of bubbles in the high heat flux area at the bottom of the columnar microstructure, effectively delay the occurrence of heat transfer deterioration, and ensure that the liquid replenishment capacity will not weakened by the introduction of nanostructures. The layered micro-nano composite structure is formed by one-time processing by a dry etching method, so as to realize precise regulation of the micro-structure, and the processing method is simple to operate and has a low manufacturing cost.