488results about How to "Reduce heat transfer efficiency" patented technology

Large thermal stresses are avoided and the fuel charge reduced in a vaporizer particularly suited for use in a reformer type fuel cell system and having a construction that includes alternating fuel/water flow path defining cells (68) and hot gas flow path cells (69) by providing heat transfer augmentation, such as a lanced and offset fin (120), only in that part of the gas flow path structure (69) adjacent the regions in the fuel/water flow path cells (68) where heating of the liquid fuel/water and vaporizing of the fuel/water where the mixture exists is a two phase material occurs and not in the area adjacent those parts of the fuel/water flow path structure (68) in which superheating of the vaporized fuel/water mixture is occurring.

A portable computer includes a shell, a printed circuit board in the shell, a heat generating element, a heat conducting sheet, a primary heat dissipation unit, a subsidiary heat dissipation unit, and a heat-transfer unit. The heat generating element is electronically connected on the printed circuit board. The heat conducting sheet is positioned on the heat generating element. The heat-transfer unit includes a heat-transfer member and a drive unit. The heat-transfer member connects to the heat conducting sheet. The drive unit moves the heat-transfer member to connect with the primary heat dissipation unit or the subsidiary heat dissipation unit.

The invention provides a treatment method of mother liquor of glyphosate, which is applicable in large-scale production and has low cost and can improve the recovery rate of triethylamine that is an activator and is used in the synthesis of glyphosate, wherein, in the technical process that the glyphosate mother liquor adopts a glycin method to prepare the glyphosate, the acidic hydrolysis of glyphosate is finished and the pure crystalloid of the glyphosate precipitates in the system, then the residual of the mother liquor is the mother liquor of the glyphosate. By controlling the charge-in mixture ratio and system temperature and adjusting the pH to a certain range, the method of the invention can obtain the triethylamine simply in a high recovery ratio which normally can reach over 90 percent.

A heat-exchanging mat to cool livestock provides for elastic water conduction channels displaced toward an upper surface of the mat and provides for cushioning placed below those elastic channels. In this way, a high degree of cushioning may be obtained without sacrificing an efficient transfer of heat into the upper surface of the mat.

A method for manufacturing a heat pipe cooling device. The heat pipe cooling device includes a U-shaped heat pipe, which is embedded within a heat conductor. The heat conductor includes a rectangular base and an upper cover connected to the base. The base includes many retaining grooves which allow the absorption end of the heat pipe to be disposed therein. The upper cover includes many through holes formed thereon corresponding to the cooling end of the heat pipe. The bottom surface includes many protrusive portions corresponding to the inner side of the absorption end of the heat pipe. Furthermore, the upper cover and the base both include a positioning portion for engaging each other. In this manner, the upper cover is pressed on the cooling end of the heat pipe. The protrusive portion will push the heat pipe to tightly contact with the base. Finally, a planarization process is performed, thereby making the bottom surface of the absorption end and the bottom surface of the heat conductor to form a flat surface.

The invention provides a defrosting control method and device of an air-cooled refrigerator. The defrosting control method of the air-cooled refrigerator comprises the following steps: detecting an air pressure difference of air supply flow of the air-cooled refrigerator before and after the air supply flow passes through an evaporator of the air-cooled refrigerator; judging whether the air pressure difference of the air supply flow is greater than a preset first air pressure difference threshold value; if the air pressure difference of the air supply flow is greater than the preset first air pressure difference threshold value, triggering the air-cooled refrigerator to start a defrosting procedure; and if the air pressure difference of the air supply flow is not greater than the preset first air pressure difference threshold value, judging whether the operation rate of a compressor of the air-cooled refrigerator is greater than a preset operation rate threshold value, and if the operation rate of the compressor is greater than the preset operation rate threshold value, judging whether the frosting thickness of the evaporator reaches a level where defrosting is needed. Therefore, defrosting can be carried out according to the actual frosting condition of the evaporator, and the refrigerator cold loss caused by frequent defrosting and the reduction of the heat exchange efficiency due to untimely defrosting are avoided.

The invention discloses a high-power LED (light emitting diode) grapheme-based heat radiation device, which comprises a base plate, wherein the base plate is pasted on the bottom surface of an LED light source and is used for heat conduction, fins for achieving the heat radiation effect are arranged on the base plate, the bottom surface of the base plate is provided with a single-layer grapheme-based interface, and contact interfaces of the bottom surface of the LED light source and the single-layer grapheme-based interface are filled with composite layers of grapheme and heat conduction bonding agents. The high-power LED grapheme-based heat radiation device has the advantages that the horizontal direction of the single-layer grapheme-based interface has very high heat conductivity, a great amount of concentrated heat can be fast conducted to the base plate and the fins, and through the corrugated design and the reasonable layout of the fins, the convection heat exchange capability of the fins and the air can be improved, so a great amount of concentrated heat is fast conducted out, in addition, the convection heat exchange heat is radiated out, the heat radiation efficiency is high, the heat radiation effect is good, and the temperature of the heat radiation device is uniform.

The invention discloses a method for preparing solid calcium carbide. The method comprises steps as follows: (1) a carbon material and a calcium containing material are ground fine, so that carbon material powder and calcium containing material powder can be obtained respectively; (2) a mixture containing the carbon material powder, the calcium containing material powder and iron powder is mixed and wet-ground with a bonding agent, and a mixed material is obtained; (3) the mixed material is shaped to obtain a material pellet; (4) the material pellet is smelted at the temperature of 1,200-1,380 DEG C so as to obtain the solid calcium carbide. The solid calcium carbide can be effectively prepared with the method, and the production cost of the calcium carbide is obviously reduced.

The invention discloses a material component testing device in the rapid testing device technical domain, which comprises the following parts: ion source (2), traveling pipe (12), upper ion detector (5) and signal processing circuit (6), wherein the ion source (2) lies in the inlet of traveling pipe; the high-field asymmetrical waveform power (8) is connected with micro-controller (7); the ion detector (5) is connected with the signal processing circuit (6), which connects the micro-controller (7); the detected sample reaches the ion source (2) anchored by carrying gas, which is ionized into the traveling pipe (12) and detected by ion detector (5) and processed by micro-controller to obtain the chemical component of the detected sample. The invention has microminiaturization, low power consumption, high-integrity, high sensitivity, which is fit for detecting real-time biochemical agent and explosive as well as drug and environment.

The invention discloses a laser metal direct forming method of liquid argon jet cooling directional solidification. The method is characterized in that: positive temperature gradient is kept all the time along the Z-axis direction in a molten pool in the subsequent forming process by adopting a method of liquid argon jet and quick cooling performed below the formed layer once a certain layer number is stacked. Meanwhile, the liquid argon for cooling is converted into argon gas and can also be used for reducing oxygen content in an argon protection box. Therefore, the columnar crystal tissue in a formed piece is continuously grown from a substrate along the Z-axis forming direction, and the formed piece obtains complete directional solidification columnar crystal tissue.

The invention relates to a methanol and C4-to-olefin quenched water and washing water airtight coupling treatment method and device. The methanol and C4-to-olefin quenched water and washing water airtight coupling treatment method provided by the invention comprises the following steps: (a) carrying out rotational flow purification on reaction gases on the tops of a quenching tower and a C4 quenching tower so as to remove catalyst particles and liquid hydrocarbon entrained in the reaction gases, and washing the purified reaction gases by using water so as to improve the quality of the washing water; (b) carrying out liquid-solid separation and concentration on quenched water containing catalyst particles at the bottoms of the quenching tower and the C4 quenching tower, carrying out heat exchange on the separated and purified quenched water, and then returning the quenched water to the quenching tower so as to recycle the quenched water; (c) carrying out drying treatment on the separated and concentrated catalyst, and recycling the catalyst particles; (d) carrying out rotational flow oil removal on the washing water serving as feedstock of a stripping tower, purifying the washing water, and recycling sump oil entrained in the washing water, so that the quality of the water purified by the stripping tower reaches the standard. The invention also provides the methanol and C4-to-olefin quenched water and washing water airtight coupling treatment device.

The invention discloses a vacuum concentrator, which relates to the technical field of pharmaceutical equipment manufacturing. The vacuum concentrator comprises a concentrating tank, wherein a jacket is arranged outside the concentrating tank, a vapor-liquid separator, a condenser, a cooler and a liquid collecting device are connected to a vapor outlet of the concentrating tank in sequence, a mixing device which is connected with a motor is installed in the concentrating tank, the mixing device comprises a rotating shaft and at least two mixing paddles which are installed on the rotating shaft, a rotating frame is installed on the rotating shaft, the rotating frame is composed of a V-shaped rod and vertical rods which are connected to both ends of the V-shaped rod, a cross rod is connected between the two vertical rods, and a plurality of scrapers of which the outer sides are abutted with the inner wall of the concentrating tank are installed on the V-shaped rod and the vertical rods. Compared with the prior art, the scrapers of the vacuum concentrator rotate along with the rotating shaft, so as to scrape extract bonded to the inner wall of the concentrating tank, prevent the wall surface from being scaled and prevent the heat transfer efficiency of the concentrating tank from being reduced.

Belonging to the technical field of environmental protection, the invention discloses a boiler flue gas white smoke removal system. According to the boiler flue gas white smoke removal system, a cooling tower and a vortex tube are arranged between a flue gas condenser and a flue gas heater, and the flue gas condenser and the vortex tube are separated by the cooling tower, thus preventing reductionof flue gas condensation efficiency and heat exchange efficiency caused by mixing of cold air flow and hot air flow. A flow splitting chamber on the outer layer of the flue gas heater is arranged along the circumferential direction of an mixing chamber on the inner layer, the mixing chamber is communicated with the flow splitting chamber through flow guide pipes arranged on the surface of the mixing chamber, under the flow splitting effect of the flow guide pipes, the hot air flow generates uniform and stable thermal shunts, thus achieving uniform heating of flue gas in the mixing chamber; and the thermal shunts cannot press flue gas into a flue gas inlet pipeline due to too large air pressure, thus effectively preventing backflow of flue gas and improving the white smoke removal effect.

The invention discloses a heat-pipe type ice-storing ice-melting cold-accumulating device and an ice-storing cold-accumulating air conditioner. The heat-pipe type ice-storing ice-melting cold-accumulating device is characterized in that an ice-storing box and a secondary refrigerant box of the heat-pipe type ice-storing ice-melting cold-accumulating device are vertically arranged in a box body upand down, the secondary refrigerant box is provided with a liquid inlet and a liquid outlet, and the ice-storing box is filled with water; multiple heat pipes pass through a partition plate so as to be evenly arranged in the ice-storing box and the secondary refrigerant box, and heat transfer materials are arranged in the ice-storing box and the secondary refrigerant box; a corrugated plate or foamed metal is utilized as the heat transfer materials, a heat pipe is a cylindrical hollow circular pipe with two enclosed ends, and the internal surface of the hollow circular pipe is provided with multiple trapezoidal groove channels; and the depth of each trapezoidal groove is 0.5-1mm, and the hollow inner diameter of the heat pipe is 25-75mm. Compared with the prior art, the device provided bythe invention has the advantages that the heat transfer efficiency is improved, and the flow resistance of the secondary refrigerant is small; and the heat transfer effect of the added corrugated plate or the foamed metal is improved; and the liquid in an ice-storing section exists in a brash ice mode, the phenomenon of overlong ice melting time is avoided, the corrugated plate or the foamed metal is utilized to improve the heat transfer efficiency.

A modular, stackable, geothermal block system for use as a subterranean or submarine heat exchanger in a geothermal energy system which provides a heating/cooling means to an external load. The stackable blocks, which can be filled with a fluid and/or material of generally high heat retention characteristics or precast in such material, contain one or more continuous passageways that extend from the top face of each block through the opposing face, through which a rigid structural heat exchange tube, fabricated from material of high thermal conductivity, is placed. The blocks are stacked one upon another and slidably mounted on the tube(s). Each tube contains a helically wound, thermal transfer tubing comprising one leg of a U-shape configured loop. Each stackable block can contain multiple paired passageways permitting more than one U-shape loop within the system. The system can interface with a solar thermal collector system.

The invention provides an electromagnetic thermal desorption device used for remediating contaminated sites. Contaminated soil is heated, stirred and conveyed in a ferromagnetic material stirring device and a tank body through electromagnetism. Through heating the contaminated soil in the device, the thermal desorption heat transfer property and the organic pollutant separating effect are improved. The electromagnetic thermal desorption device comprises a material conveying device, an electromagnetic heating device and an exhaust gas treating and purifying device, wherein the electromagnetic heating device comprises an excitation controller, a heating coil, a thermal insulating material, a heating and conveying device, a temperature probe, a circulating water cooler and the like; and the exhaust gas treating and purifying device comprises an exhaust gas collecting pipe, a dust precipitator, a condenser, a collector, a catalytic oxidation device and the like. For heavy metal, low-melting-point glass powder and natural mirabilite powder are added, glassy substances are formed after temperature is raised through heating, the glassy substances solidify, and heavy metal pollutants are eliminated. The electromagnetic thermal desorption device has the characteristics of high heating speed, high heat transfer effect and small exhaust gas output. The size of a system is small, a moving treatment platform can be integrated, and integral transporting in-situ operation is realized.

The invention relates to the technical field of energy and environment and discloses a chemical engineering power multi-generation energy system and a method. Crude synthesis gas produced by carbon-rich raw material firstly enters a chemical engineering production flow, the synthesis gas can not carry out water-gas shift reaction to reduce the proportion of CO/H2, temperature reduction and purification are carried out for direct chemical engineering synthesis, the product of synthetic reaction is separated into unreacted gas and crude products by flash evaporation process, part of the unreacted gas circulates and carries out synthetic reaction again, while the other part of the unreacted gas carries out water-gas shift reaction and a CO2 separating unit for decarburization, the synthesis gas after decarburization is taken as fuel gas to be sent to a combined cycle power system for power generation. By adopting the invention, under the promise of ensuring that the active ingredient of new synthesis gas is fully transformed into chemical products, the energy utilization situation of the system can be improved; meanwhile, by adopting the way of separating CO2 after chemical engineering synthetic reaction, the energy consumption for separating CO2 can be lowered and the problem of the efficiency reduction of the energy system can be solved.