33results about How to "Enhanced condensation heat transfer" patented technology

The invention relates to a surface preparation method capable of preparing various nanowire structures, and belongs to the technical field of surface treatment. According to the method, a template-assisted electroplating method is utilized, and multiple structural shapes such as upright type, agglomeration type and round pit type can be formed by changing hole spacing, hole diameter and electroplating duration of the template, and the structure height and an included angle of the upright type and the agglomeration type can be changed. The height of nanowires is 4 microns-50 microns, the centerdistance of the nanowires is 60nm-500nm, and the diameter of the nanowires is 5nm-400nm. The surface shapes prepared by the preparation method are controllable, structural form is diversified, and cross-scale effect can be achieved, the upright type and the agglomeration type can be used for condensation and the round pit type can be used in the field of phase change heat transfer such as boiling.

The invention discloses a control method and device for a condensation heat-transferring property of a super-hydrophobic surface. The control method is characterized by comprising the following steps: modifying the surface of a condensation heat exchanger into a super-hydrophobic surface with a micro structure; utilizing a device which comprises a computer, a control module and a realizing moduleto firstly realize dropwise condensation; and applying mechanical bandwidth micro-vibration to the main body of the condensation heat exchanger so as to compel a condensate water drop in a certain size or within a certain size scope to quickly drop from the surface of the condensation heat exchanger, thereby achieving the purpose of controlling the dropwise condensation heat-transferring property. The control method has the beneficial effects that the condensation heat transfer can be strengthened while the strength of heat exchange property is controlled. By applying micro-vibration to a heat exchange surface, the wetting state of the condensate water drop is changed and the condensate water drop can easily drop from the heat exchange surface; and simultaneously, the applied mechanical vibration is wide-frequency vibration which acts on condensate water drops in different sizes. The control on the dropwise condensation heat-transferring strength is realized by controlling a dropping diameter in a dropwise condensation process.

The invention relates to an immersed liquid cooling server and an immersed liquid cooling method for the server. The immersed liquid cooling server comprises a refrigerant groove, a heating element, a cooling element and a blower or a fan, wherein the refrigerant groove is used for accommodating refrigerants, the heating element is arranged in the refrigerant groove and is soaked by the refrigerants, the cooling element is positioned above the liquid level of the refrigerants, the blower or the fan is arranged above the cooling element, and the direction of airflow blown by the blower or the fan faces the cooling element. The immersed liquid cooling server has the forced condensing heat exchange effect. The immersed liquid cooling method for the server comprises the following steps that the refrigerants absorb heat of the heating element soaked into the refrigerants to form refrigerant steam through evaporation, and the refrigerants upwards flow; the cooling element carries out heat exchange with the upward flowing refrigerant steam, the refrigerant steam is condensed into refrigerant liquid drips, and the refrigerant liquid drips drip back into the refrigerant groove due to gravity effect; the air is downwards blown towards the cooling element through the blower or the fan. The method has the advantage that the condensed heat exchange of an immersed liquid cooling system is enhanced.

The invention relates to a high-efficiency gravity heat pipe and a manufacturing method thereof. The high-efficiency gravity heat pipe comprises an evaporating section, a heat insulating section and a condensing section, and is characterized in that a metal powder porous layer is sintered on the inner surface of the heat tube evaporating section, and the condensing section is chemically coated. The heat tube manufactured by the process method in the invention can simultaneously reinforce boiling heat transfer and condensing heat transfer, so that a plurality of ideal vaporization cores are artificially increased, thus the boiling phenomenon of the liquid is continuously carried out to achieve a purpose of reinforcing the boiling heat transfer; on the other hand, the surface of a chemical coating of the heat tube condensing section is modified to acquire a low surface free energy value; simultaneously, the coating layer is a metal-based coating layer with good thermal conductivity, thus the condensing heat transfer can be reinforced; from the above, the high-efficiency gravity heat tube reinforce the boiling and condensing effects very remarkably, has the characteristics of good heat transfer reinforcing effect, high production efficiency, low cost and the like.

The invention discloses a heat transfer element for reducing the liquid film thickness of a regenerative condensing heat exchanger. The heat transfer element is combined with two first corrugated plates and a second corrugated plate of composite structure. The first corrugated plate has inverted double herringbone corrugated channels, the first vertical trapezoidal corrugated channel and the first vertical plate; the second corrugated plate has double herringbone corrugated channels, the second vertical trapezoidal corrugated channel and the second Vertical slab. The first corrugated plate and the second corrugated plate are stacked to form a condensation heat transfer channel composed of two different heat transfer channel units. When condensation occurs, the first corrugated plate and the second corrugated plate accelerate the draining speed of the condensate at the same time, which reduces the thickness of the condensate film and further improves the condensation heat transfer capacity of the regenerative condensing heat exchanger. The invention can accelerate the discharge of the condensate, reduce the thickness of the condensate film, strengthen the condensation heat transfer, and further improve the comprehensive performance of the regenerative condensation heat exchanger.

The invention aims to provide a long-term efficient passive containment cooling system utilizing a jetting technique. A built-in heat exchanger of a containment and upper and lower pipe sections form a first-stage heat discharging system; an air cooler, a water tank baffle plate and a steam-air jet device in an external water tank form a second-stage heat discharging system of a cooling system; the steam-air jet device is located on the side wall surface of a gas space in the water tank and is used for introducing water steam produced by virtue of the first-stage heat discharging system into an ejector to jet air of the second-stage heat discharging system, so as to decrease the inlet temperature of the first-stage heat discharging system, so that the heat discharging efficiency of the system is improved; and a passive containment heat exchanger adopts an intensified heat exchange pipe and is located in the containment, the heat exchange pipe adopts a small-coil-pipe light pipe, and drainage plates are mounted on the periphery of the heat exchanger. According to the long-term efficient passive containment cooling system, when a crevasse accident occurs at a main cooling agent loop or a main steam pipeline, the internal heat in the containment can be efficiently taken away in a long term, so that the internal temperature and pressure of the containment can be below safety limit values for a long time under accident conditions.

This invention relates to a small heat pipe, which comprises tail end, pipe body, sinter layer and degassing end, wherein the tail end, pipe body and degassing end form the sealing cavity, and the inner wall of the pipe has a sinter layer; the sinter layer is absorbed working liquor. The method for manufacturing the heat pipe comprises the following steps: a) extruding one end of the pipe into a degassing pipe; b) inserting mandrel into the pipe, and the tapering of the mandrel must be inserted into the degassing pipe; c) filling metal powder into the gap between pipe inner wall and the mandrel; d) clinkering in high temperature to form sinter layer, cooling and getting the mandrel out; e) forming sealing tail end in the other end of the pipe; filling liquid heat-transfer agent, extracting air in the sealing cavity; f) grasping the degassing pipe, and then welding the end of the degassing pipe to form the degassing end.

The invention relates to an absorption refrigerator condenser based on a heat tube bundle with a coagulation strengthening function. The absorption refrigerator condenser comprises a vacuum pressure tank, the heat tube bundle, a guide fan housing and a guide exhaust fan, wherein the guide fan housing is fixed above the vacuum pressure tank; the guide exhaust fan is connected with the guide fan housing; the guide fan housing is not communicated with the vacuum pressure tank; heat tubes in the heat tube bundle are vertically arranged; the upper sections of the heat tubes are provided with condensation sections with outer fin structures; the lower sections of the heat tubes are evaporation sections with outer groove structures; the condensation sections are located inside the guide fan housing; the evaporation sections are located in the vacuum pressure tank. The defect caused by a water cooling heat exchanger in the absorption refrigerator condenser is avoided, and the absorption refrigerator condenser based on the heat tube bundle with the coagulation strengthening function has the advantage that the condensing effect is effectively strengthened, and belongs to the technical field of heat tube condensers.

The invention discloses a method for spontaneously driving away condensed liquid droplets in the horizontal direction. The method comprises the following steps: placing the glass sheet on a flame for fumigation, and then separately dissolving the glass sheet, tetraethyl orthosilicate and ammonia solution Put it in a dry container and let it stand for 20-26h after vacuuming; then anneal the glass sheet at 500-600°C for 1.5-3h; use O 2 Plasma treatment of the annealed glass sheet to obtain the base layer, then respectively place the base layer and perfluorooctyltrichlorosilane in a dry container, vacuumize and let stand for 1‑3h; finally, use 8‑12KV high voltage power supply to pass The method of corona polarization injects a gradient electric field into the above-mentioned base layer, and puts the base layer with the gradient electric field horizontally into the condensation environment to realize the effect of driving away the condensate droplets. The method can effectively solve the problem of poor detachment effect of condensate droplets existing in the existing detachment method.