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

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.

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 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 belongs to the technical field of water collecting and energy conservation, and particularly relates to a water collecting device with the gradient hydrophilic and hydrophobic performance and an application thereof. The water collecting device with the gradient hydrophilic and hydrophobic performance comprises gradient pore hydrophilic porous foam, hydrophobic porous foam, a collecting tank, a protective cover and a porous foam fixing structure; wherein the protective cover is filled with the gradient pore hydrophilic porous foam and the hydrophobic porous foam; two spaces are arranged on the two sides of the hydrophobic porous foam correspondingly; the front space is an interval gap between the hydrophobic porous foam and the gradient pore hydrophilic porous foam, and the width of the front space is in a millimeter scale; the rear space is provided with the collecting tank; and the hydrophobic porous foam is suspended through the porous foam fixing structure, so that the interval gap on the front side communicates with the collecting tank.

The invention discloses a hot water non-stick surface structure and a preparation method thereof. The super-hydrophobic interface structure comprises a nano cone array structure formed on the surface of a substrate, wherein the nano array structure comprises a plurality of nano protrusions arranged in an array manner; at least the top of the nano protrusion is provided with a conical structure; the distance between two adjacent nano protrusions is 50-500nm; the top diameter of the nano protrusions is 1-200nm; and the surface of the nano array structure is modified with low surface energy substances. The preparation method is mainly implemented by virtue of a chemical bath deposition method. The super-hydrophobic surface structure disclosed by the invention has good hot water non-stick properties, non-stick impact and instantaneous rebound of hot water drops or hot water flow can be realized, the preparation process is easy to operate and control, any expensive equipment is not needed, and the super-hydrophobic surface structure is low in consumption, environment-friendly, high in reproducibility and short in period, can be prepared in large area and has excellent industrial application prospects.

The invention discloses a surface preparation method capable of preparing various nanowire structures, and belongs to the technical field of surface treatment. According to the method, by means of a template-assisted electroplating method, various structural appearances such as an upright type, an agglomeration type and a round pit type can be formed by changing the interval and aperture of template holes and the electroplating time, and the structure height and included angle of the upright type and the agglomeration type can be changed. Nanowires are 4-50 microns high, the center distance ofthe nanowires is 60-500 nm, and the diameter of the nanowires is 5-400 nm. The surface appearances prepared through the preparation method are controllable, the structural form is diversified and cross-scale, the upright type and the agglomeration type can be used for condensation, and the round pit type can be applied to the field of phase-change heat transfer such as boiling.

The invention provides a portable dew collecting device with conical reinforced condensing pipes, and belongs to the technical field of condensing phase transformation. The portable dew collecting device with the conical reinforced condensing pipes structurally comprises the conical reinforced condensing pipes, condensing pipe hanging racks, a support frame and a dew collecting tank, wherein microgrooves are formed in the outer surfaces of the condensing pipes in the axis direction and are used for downwards discharging condensate; sub-millimeter micro-bulging coarse structures are arranged on rib walls between the micro grooves; hydrophobic modification and hydrophilic modification are respectively carried out on the upper parts and lower ends of the condensing pipes so as to facilitatethe generation of dropwise condensation on the surfaces of the condensing pipes, intensity the condensation process, facilitate the formation of downward capillary differential pressure in the water discharging grooves and promote the discharge of condensed water from the surfaces of the condensed pipes; the condensing pipes are arranged in a staggering manner to increase the windward area; and the condensing pipe hanging racks are connected to the support in a bayonet type, thereby facilitating the disassembly and improving the portability. The whole device has novel structure, good portability, clear principle of water vapor collection and high reliability, can effectively intensify the condensation process of water vapor in the air on the surfaces of the condensing pipes and improves the collection efficiency of the condensed water.

The invention relates to the technical field of strengthened heat transfer, in particular to a device for controlling the dropwise condensing heat transfer performance of a superhydrophobic surface bymeans of a sound field. The device comprises a shell; a dropwise condensing heat exchanger is arranged in the shell, a steam inlet is formed in the upper end of the shell, a condensed water outlet isformed in the lower end of the shell, a cooling water inlet and a cooling water outlet are formed in one side of the shell, the cooling water inlet is located above the cooling water outlet, and a sound is arranged on the other side of the shell and fixedly connected with the side wall of the shell; and the device further comprises a control module, an adjusting unit and a heat transfer performance detection unit, the control unit is connected with the adjusting unit, the adjusting unit is connected with the sound to enable the sound to generate a vibration which has the corresponding frequency and amplitude with a signal generated by the control unit, the vibration is loaded to the dropwise condensing heat exchanger, the heat transfer performance detected by the heat transfer performance detection unit is transmitted to the control unit in a signal mode, and the control unit adjusts the vibration signal frequency and amplitude of the sound.

The invention relates to a novel efficient heat exchanger gravity heat pipe, in particular to a gravity heat pipe for thinning a condensation film by changing a pipe wall structure, and belongs to the technical field of heat exchange. The gravity heat pipe is composed of three zones including an evaporation section, a heat preservation section and a condensation section. When a gravity heat pipe works, a working medium is heated to evaporate to reach the condensation section to form a thick liquid film on the wall face, thermal resistance is increased, and heat transfer is blocked. According to the novel efficient heat exchanger gravity heat pipe, the annular elements are additionally arranged in the pipe, the wall face structure is changed, and therefore the liquid film is thinned. The annular elements are additionally arranged in the evaporation section, and therefore the liquid film of the evaporation section is evenly distributed, and falling film evaporation is achieved; the annular elements are additionally arranged in the condensation section, and therefore the liquid film is thinned, and condensation heat exchange is strengthened. Meanwhile, the annular elements are additionally arranged, enhancement of heat transfer of heat exchange areas of the condensation section and the evaporation section is increased, the arrangement of the elements in the evaporation section can further solve the problem that overflowing liquid generated by too thick liquid films returns to a liquid pool again, and influences of cold and hot air flow joining on heat transfer are avoided.

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 provides a hydrophilic and hydrophobic conversion intelligent surface heat exchange tube and a control system thereof, the inner surface of a base tube is divided into a spacer region and an intelligent surface region in the circumferential direction, an insulating layer I, a conductive layer, a porous layer and an insulating layer II are sequentially constructed in the intelligent surface region from the inner wall of the tube, and finally hydrophobic groups are electrified and sprayed on the insulating layer II. The exterior of the base tube is divided into a plurality of sections at equal intervals, thermocouples are welded to the upper end and the lower end of each section to monitor the temperatures of the upper end and the lower end of the section, the temperatures are fed back to a computer, and the computer adjusts currents of all the channels of the multi-channel direct-current power source to enable charged hydrophobic groups to move. And the inner surface of the pipe is subjected to hydrophilic-hydrophobic conversion in a spatio-temporal level. In the heat exchange process of the heat exchange tube, wettability transformation of the inner surface of the tube can be achieved according to different flow patterns, phase distribution in the tube is regulated and controlled, a multiphase flow structure and heat transfer are coordinated, and the heat transfer effect is improved.