32results about How to "Increase heat transfer distance" patented technology

In a micro heat exchanger for the transfer of high area-specific amounts of heat from a heat source to a heat transfer medium, including a heat transfer structure with an inlet- and an outlet duct structure between which a plurality of passages extend through the heat transfer structure, the inlet and outlet duct structures are arranged in alternating order in the heat transfer area in close proximity to the heat source, with the inlet and outlet duct structure and the passages interconnecting the inlet and outlet structures covering the whole heat transfer area directly adjacent the heat source.

The present invention relates to a main body for an original direct flame baking oven capable of cooking even without filling water in a groove of an oil drip pan by inhibiting the flow approach of heat to the groove of the oil drip pan as much as possible.

The invention belongs to the field of heat transfer, in particular to a combined oscillatory flow heat pipe with an evaporation and heat exchange connecting section. In the invention, a condensation end of a primary oscillatory flow heat pipe and an evaporation end of a secondary oscillatory flow heat pipe are both arranged in an evaporation and heat exchange connecting section and respectively, horizontally and fixedly connected to the lower part and the upper part of the evaporation and heat exchange connecting section; the evaporation and heat exchange connecting section is internally vacuumized, filled with a working solution and then sealed; the working solution immerses the condensation end of the primary oscillatory flow heat pipe to form an oscillatory flow heat pipe combination unit, and 1-3 stages of oscillatory flow heat pipe combination units are connected in series to form the combined oscillatory flow heat pipe with the evaporation and heat exchange connecting section; and the primary and the secondary oscillatory flow heat pipes of the oscillatory flow heat pipe combination unit can also be formed by connecting 2-5 oscillatory flow heat pips in parallel. The purposeof prolonging a heat transmission distance is achieved through the serial combination of the oscillatory flow heat pipes, and the purpose of expanding the heat radiating area is achieved through a parallel combination, thus the heat transmission capacity of the oscillatory flow heat pipes is obviously improved. The invention is suitable for the fields of high-efficiency compact heat exchangers, industrial afterheat recovery, solar energy utilization, and the like.

The invention discloses a loop heat pipe-type cylindrical solar seawater desalination device. The device comprises a cylindrical multiple-effect distiller, a light collection groove and a loop heat pipe. An evaporating pipe of the loop heat pipe is used as a solar heat collecting pipe and a condenser pipe of the loop heat pipe is used as a distiller heating pipe so that characteristics of good heat transfer performance and high integral efficiency are obtained. A heating pipe, a heat-transfer pipe, a semi-circular groove and a nozzle unit are tightly arranged in a heat-insulation cylinder inner-cavity so that a pre-heating chamber, a distillation chamber, a seawater tank and a fresh water tank are formed and thus the distiller structure is very compact, can be processed easily and is suitable for standard production. The distiller has the characteristics of repeated use of vaporization latent heat, reinforcement of inner heat and mass transfer processes and improvement of an operation temperature. The heat transfer areas of the distillation chamber are increased from inside to outside so that a small heat transfer temperature difference is kept, the whole distiller effective number is improved and a concentration ratio and a water yield are further improved. The loop heat pipe-type cylindrical solar seawater desalination device is suitable for low-cost modularization production and can be widely used in the field of solar energy seawater desalination.

The invention provides a refrigerator and a frostless refrigerating system thereof. The frostless refrigerating system includes an air duct panel which is arranged in the refrigerator and positioned in the front of a back side liner; an air duct is formed between the air duct panel and the back side liner; an evaporator is arranged in the air duct and can divide the air duct into a front air duct and a back air duct; the back air duct is provided with an air returning opening which communicates with a cavity of the liner, and the front air duct is provided with an air supplying opening which can supply air to the cavity of the liner; a fan can drive air flow to flow to the front air duct from the back air duct; a motor can drive the fan to rotate; and the motor is connected to the fan. According to the refrigerator and the frostless refrigerating system thereof, primary heat exchange is performed when air flow passes through the back part of the evaporator during air returning, secondary heat exchange is performed when the air flow passes through a back air duct of the fan and then passes through the front part of the evaporator during air supplying, and in this way, heat exchange is performed between the front part and the back part of the evaporator and the air flow, the heat exchange distance is prolonged, the heat exchange efficiency is improved, the frosting amount is reduced, power consumption of defrosting is decreased, extra power consumption of defrosting is not required, and energy consumption of the refrigerator is decreased.

According to the control method of the loop heat pipe, when the temperature sensor on the surface of the heat dissipation component detects that the temperature of the heat dissipation component is too high, the electromagnetic valve is automatically opened, the loop heat pipe starts to work, and heat dissipation is conducted on the heat dissipation component through the loop heat dissipation effect of the heat pipe. Firstly, a heat dissipation component transmits heat to an evaporation end of a loop heat pipe on the surface of the heat dissipation component, and a liquid working medium in the evaporation end absorbs heat and is gasified to generate power for pushing the working medium to circulate; the generated steam working medium is collected and heated in a steam channel on the surface of the capillary core, and flows into a radiator through a steam pipeline; after sensible heat and latent heat of superheated steam are dissipated in the radiator through radiation, the superheated steam is finally condensed into liquid and flows back under the action of capillary suction force, and circulation is repeated. A heat pipe radiator heat dissipation system and a solar heating system are creatively combined, and the zero-energy-consumption heat dissipation and heat preservation effects can be integrally achieved.

The invention relates to a diesel engine exhaust manifold fixing device. The diesel engine exhaust manifold fixing device comprises an exhaust manifold and is characterized in that fixing flanges are arranged on the portions, on the two sides of the exhaust manifold, of the root of the exhaust manifold respectively, fixing countersinks are formed in the two ends of each fixing flange respectively and connected with corresponding fixing blocks, each fixing block is provided with a fixing bolt in a penetrated mode through an unthreaded hole in the fixing block, the threaded part of each fixing bolt extends out of the corresponding fixing block, and the two fixing countersinks located in every two adjacent fixing flanges are pressed by the same corresponding fixing block. The diesel engine exhaust manifold fixing device has the advantages that the influence on the bolts by heat loads can be reduced, and then the fixation reliability is improved.