Thermoelectric semiconductor heat exchanger
(57) Abstract:The invention is intended for application in the field of heat transfer, namely the intensification of heat transfer in refrigeration, air conditioning systems and other similar devices. Thermoelectric semiconductor heat exchanger contains two made of vysokoteploprovodnyh material and coaxially mounted tubes: external, is provided with radial holes in the form of longitudinal slots, and the inner, made in the form of a polyhedron. The device also contains collected from thermocouples thermoelectric modules (TEM), electrically interconnected by sections consistently. TEM installed their first junctions on the inner faces of the pipe along its entire length, and the second junction TEM located in a radial hole of the outer tube at the level of its surface, with longitudinal ribs attached at its base to the surface of the outer tube. Through the ends of the sealed annulus derived power supply terminals TEM and pipe for pumping air. The use of the heat exchanger will allow you to abandon environmentally harmful cooling fluid is sabreena relates to the field of heat transfer and can be used for intensification of heat transfer in refrigeration, the air conditioning systems and other similar devices.In all cases heat transfer heat transfer through the boundary (wall) separating media with different temperatures. The effectiveness of heat transfer depends on the properties of the medium separation boundaries (for example, the coefficient of thermal conductivity of the wall material), and the magnitude of the difference in temperature between the two environments - the greater the temperature gradient, the more efficient the heat transfer. Of course, the intensification of heat transfer is possible only by changing these parameters.The most promising technical solutions, in which the intensification of heat transfer due to the change in temperature difference between the environments is achieved by using thermoelectric modules (TEM).Known heat exchanger according to ed. mon. (USSR) N 439252 (H 01 L 35/02, 1973 ), in which the intensification of heat transfer between the flows of media in two coaxially arranged pipes is achieved by TEM, located on the outer surface of the inner tube and protected from the flow of the case.The disadvantages of this device include a lack of efficiency and operational reliability the definition of the solution is a device on the bus. St. (USSR) N 1763841 (F 28 D 7/10, F 28 F 13/00, 1992) also contains a coaxially arranged pipes with different environments, and provided with internal longitudinal ribs, each of which has insulated the area located inside the outer tube, and the area located outside of the outer tube. The outer tube is made with radial holes (in the form of longitudinal slits) in the ribs of the inner pipe with the outer flange. Temps are between flanging and fins in thermal contact with them.A disadvantage of the known devices is the need to ensure a continuous flow of two media in coaxial pipes.The proposed thermoelectric semiconductor heat exchanger contains two made of vysokoteploprovodnyh material and coaxially mounted tubes: external, is provided with radial holes in the form of longitudinal slots, and the inner, made in the form of a polyhedron. The device also contains collected from thermocouples thermoelectric modules are electrically interconnected by sections consistently. TEM installed their first junctions on the inner faces of the pipe along its entire length, and the second junction TEM, whic is United at the base to the surface of the outer tube.Through the ends of the sealed annulus derived power supply terminals TEM and pipe for pumping air.The proposed thermoelectric semiconductor heat exchanger shown in the accompanying drawings.In Fig. 1 is a front view in section, Fig. 2 is a side view, Fig. 3 shows a diagram for each section-serial-TEM.Thermoelectric intensifier consists of a hexagonal copper pipe 1, the sides of which the entire length of pipe installed 36 uniform semiconductor modules 2 (each module consists of 16 elements) electrically interconnected by sections consistently. The cold junctions of the modules installed on each of the faces, soldered copper foil 3. After installation of this design in a pipe with holes 4 foil 3 is deflected and soldered to the outer surface of the pipe 1, and the remaining part of the foil is bent at an angle of 90 degrees to the pipe surface. For sealing and subsequent vacuum annulus in the ends of battery inserted rubber gaskets 5, top, epoxy 6, through which removed the power supply terminals 7 and 8 and the pipe for pumping air 9. electrical network via the power supply terminals 7 and 8 thermoelectromotive 2 provides the heat transfer through thermoelectric elements. By adjusting the value of the power supply, you can control the rate of temperature change of the working environment (air, water, oil and others) at the exit of the pipe 1. Depending on the polarity of the applied voltage can be achieved of a thermoelectric heat exchanger in either heating or cooling.Specifications
The fluid flow, l/min 2...3
Consumed power, W 200
Time output mode, min 1,2...1,5
The maximum temperature difference,oC to 42
Ambient temperature,oC -20...+50
Overall dimensions, mm: diameter 55
Weight kg 0,4
The use of the heat exchanger will allow you to abandon environmentally harmful coolants type "freon", to simplify the manufacturing techniques to improve reliability. 1. Thermoelectric semiconductor heat exchanger containing made of vysokoteploprovodnyh material and coaxially mounted tubes: external, performed with radial holes, and internal, in thermal contact, which established the first junctions of thermopile, wherein the inner pipe is made of multi-faceted, and thermopile installed swne surface of the outer tube in its radial holes, with longitudinal ribs that are attached at their bases to the surface of the outer tube, and the edges sealed annulus derived power supply terminals of thermopile and the pipe for pumping air.2. Thermoelectric semiconductor exchanger according to p. 1, wherein thermopile consists of thermoelectric modules are electrically coupled each section sequentially.
FIELD: spacecraft temperature control systems; removal of low-potential heat from on-board systems of spacecraft.
SUBSTANCE: proposed trickling cooler-radiator includes heat-transfer agent storage and delivery system, drop generator with acoustic oscillation exciting element, drop collector, transfer pumps and pipe lines. Trickling cooler-radiator is provided with heat stabilization system including heaters mounted on structural members of cooler-radiator and thermostatting units made in form of shield-vacuum insulation of these members. Said system is also provided with bypass pipe line laid between drop generator and collector and provided with volumetric expansion compensator (with electric heater) and automatic temperature control unit ensuring operation of heaters by signals from respective sensors. To reduce emission of heat-transfer agent, trickling cooler-radiator is provided with hydraulic accumulators at drop generator inlet and at drop accumulator outlet. Passages of output grid of drop generator have geometric and hydraulic characteristics varying from axis of symmetry towards periphery for smooth distribution of temperature field. Drop collector may be passive with inner surface formed by walls of one or several slotted passages through which heat-transfer agent is delivered for forming moving film.
EFFECT: enhanced efficiency and reliability.
2 cl, 2 dwg
FIELD: manufacture of heating devices, possibly used in nuclear reactors.
SUBSTANCE: apparatus includes housing made of two envelopes; heaters; inlet and outlet branch pipes. Outer and inner envelopes of housing are mutually joined through spring in such a way that helical slit is formed for passing heat transfer agent. Heaters are in the form of copper sectors inside which cable type electric heaters are arranged. Clamp with locking sleeve is arranged along central axis of apparatus for forcing heaters to housing.
EFFECT: enhanced operational reliability of quick response easy-to-repair heating apparatus.
FIELD: devices for transfer of heat between first and second walls brought in contact with first and second thermal masses.
SUBSTANCE: proposed device includes heat-insulating module which may be inserted between first and second walls for forming closed circulating loop for fluid heat-transfer agent; this closed loop includes first vertical or inclined passage running along first wall and second vertical or inclined passage running along second wall; these passages are shifted relative to each other in vertical direction; device is also provided with upper passage connecting the first and second passages and lower passage connecting the first and second passages to ensure circulation of fluid heat-transfer agent in said loop due to convection when passage located below is subjected to action of temperature exceeding temperature of passage located above, thus making it possible to ensure transfer of heat and to discontinue circulation when passage located below is subjected to action temperature below temperature of above passage, thus excluding transfer of heat and ensuring heat insulation.
EFFECT: enhanced efficiency.
14 cl, 31 dwg
FIELD: temperature control of rooms being under a heat exchanger.
SUBSTANCE: the horizontal heat exchanger recovering the water heat in the winter time, combining the functions of a coating and a roofing, having partitions carrying steel strings and exterior walls of rammed earth, a coating of two layers of transparent film placed on the strings, the second layer is perforated by holes passing through air bubbles for formation of a bubbly ice covering the water poured on the coating from the bottom of water reservoirs, a spouting chute, as well as a transparent film vapor seal placed under the heat exchanger, and a stack of several layers of transparent thin film.
EFFECT: provided protection of translucent components against ozone, solar and wind destruction and against fire, simplified and made cheaper penetration of the solar energy under the roofing, adjusted rational use of the heat-transfer medium and rain water.
FIELD: constructional engineering, pipelines.
SUBSTANCE: methods and devices for channel lead-in of two fluids within multichannel monolithic structure (in monolith), their distribution and lead-out are proposed, where channel apertures being scattered all over the sectional area of the said structure. The said device contains collector head, either monolithic assembly or monolithic complete set, or assembly battery or complete sets, or monolithic block. Moreover, invention features method and reactor for mass- and/or heat exchange between two fluids, the said fluids being distributed through one or more collector heads and assemblies or complete sets, or assembly batteries or complete sets, or blocks.
EFFECT: simple and effective way to supply two various fluids to individual channels within multichannel monolithic structure without pipe application, as well as to connect some monoliths.
23 cl, 18 dwg
SUBSTANCE: invention refers to temperature control, and namely to discharge devices of low-potential heat from systems of space vehicles. Refrigerator-emitter includes heat carrier storage and supply system, drop generator, passive drop header, transfer pump, pipelines, heaters of structural elements and heat stabilisation system. Drop generator has excitation element of acoustic vibrations and outlet grid. Slot channels of passive drop header are equipped with separate heat carrier feed lines. Each line has on-off valve and automatic flow control. Bypass circuit of transfer pump is provided with the latter as well. Automatic flow controls installed at inlets of slot channels, in bypass circuit of the pump and in drop generator circuit are connected through recording and control unit to optic sensors. Those sensors are installed in the following way: one - near the neck of drop header, the other - at some distance from the first one, which is bigger than distance between centres of drops in direction of their movement at least by five times. Opening angle of drop header is within the range of 40°…70°. The above version of the device allows quick control of total heat carrier flow rate through drop header, thus providing normal pump operation and continuous stable operation of the whole header.
EFFECT: stabilisation of operation of drop refrigerator-emitter as a whole, improving its reliability and efficiency.
FIELD: power engineering.
SUBSTANCE: heat-exchange device, comprising facilities to form at least four separate circuits for flows inside the heat exchanger, making it possible to carry out indirect heat exchange between the first circuit and the second circuit, the third circuit and the fourth circuit; at the same time the device may contain facilities to form a separate fifth circuit in the heat exchanger with the possibility to carry out indirect heat exchange between it and the first circuit.
EFFECT: improved method and device to combine zones of heat transfer of spiral, ribbed plate, tubular heat exchangers and a heat exchanger of ribbed pipes, which ensures total efficiency of the process.
25 cl, 5 dwg
SUBSTANCE: invention relates to a method of using a distillation column to remove water and components with boiling point lower than that of 1,2-dichloroethane from 1,2-dichloroethane. The method is characterised by that at least a portion of condensation heat of water-containing secondary steam from the distillation column is used to evaporate sodium hydroxide solution.
EFFECT: use of the present method enables to optimise use of released heat and reduce consumption of cooling water.
3 cl, 1 dwg