Thermal siphon

FIELD: heating systems.

SUBSTANCE: invention is designed for heat transfer and can be used for ensuring operation of mechanical devices submerged into liquid medium. Thermal siphon contains housing, the working volume of lower chamber of which is filled with liquid, cone by means of which the lower chamber with steam line for transporting steam is partitioned, steam generator in lower chamber and condenser in upper chamber. Condenser is cooled surface of upper chamber of thermal siphon, some part of lower chamber is intended for air accumulation and other gaseous impurities originally contained in thermal siphon. Valve for releasing some air to the outside is installed in lower chamber.

EFFECT: invention allows improving heat transfer effectiveness in thermal siphon from heated part to cooled section by intensifying heat transfer during condensation in conditions of high air content of the system.

1 dwg

 

The invention relates to heat exchange devices and can be used as a heat transfer device to provide mechanical devices, immersed in a liquid, such as oil circuit breakers at low ambient temperatures. Existing heating device that uses a standard tubular heaters heater, are not reliable enough and can lead to fire low-oil circuit breakers series TDC.

There are various types of thermosyphons and heat pipes, however, almost all of them to work effectively require pumping of air and maintain high integrity, resulting in reduced reliability of the devices and their high cost [Reference exchangers. M, Energoatomizdat, 1987, Dan P., Rey D. Heat pipes. Meters, Energy, 1979, 272 S., I.L. Pioro, Antonenko, VA, Pioro PS Efficient heat exchangers with two-phase thermosyphons. Kyiv. Naukova Dumka, 1991, 246 S.]. The presence of even a small admixture of air in the inner part of thermosyphons leads to a sharp decrease of heat transfer coefficient during condensation of the working fluid.

Of considerable interest are devices that would provide a reliable supply of heat by any content of air in the system.

It is known a device in which IP is result special plate for the formation of vapor cavities in the condensation zone, eliminating the influence of penetrating from the outside air [A.S. No. 1764199, 1990.03.16, 5 NC 7/20]. However, the proposed design does not prevent the influence of the gases dissolved in the liquid, and has a number of design constraints.

The closest to the technical nature of the claimed device is the device shipped with the system for cooling electronic equipment, the distinctive feature of which is the presence of the guide cone or cavity for collecting or direction of the pair [RF patent №2066518, 1993.04.05, 6 NC 7/20].

The disadvantage of this device is the lack of areas for accumulation of non-condensable impurities, which significantly affects the intensity of condensation.

The present invention is the problem of increasing the efficiency of heat transfer in thermosyphon from the heated portion to the cooled area through intensification of heat transfer during condensation in conditions of high air content in the system.

The task is solved by the fact that in the known device of thermosyphon, comprising a housing, a working volume of the lower chamber which is filled with fluid, a funnel, which is blocked by the lower chamber, with the steam pipe for conveying steam, the steam in the lower chamber and the condenser in the upper chamber, the condenser is cooled surface of the upper chamber t is Rosita, the lower part of the chamber reserved for the accumulation of air and other gaseous impurities originally contained in thermosyphon, while in the lower chamber has a valve for dropping part of the air to the outside (the drawing). thermosyphon without a funnel with tubing for the movement of the pair can work properly only if the system is rolled back, the air and the liquid is thoroughly degassed. Otherwise, the admixture of foreign gas dramatically reduces the intensity of the condensation process and the result is not ensured transfer the required heat flux. The presence of a funnel with tubing for the movement of the pair leads to the fact that pure steam arising from the boiling liquid on the heater, accumulates in the funnel and flows through the steam in the condensation zone, pushing staying there the air in the lower chamber. Using the valve located in the chamber, allows for a certain pressure to throw in chamber the air in the atmosphere, resulting in improved characteristics of thermosyphon and the reduction of pressure in the system. As the working fluid used isopropyl alcohol solution in water, which provides nezamerzayka working fluid at low temperatures.

The device consists of an upper chamber 1 having the shape of a vertical cylinder with Crisco is 2, the lower chamber 6, which is partitioned by a funnel 7 with small holes on the sides for flow of liquid and steam line 3, valve 4 and the heater 5, the drawing. The cylinder is inserted into the slot of the oil switch series TDC.

The device operates as follows.

The drawing shows the device in operation. At the initial moment of the lower chamber of thermosyphon fluid-filled. The fill level is determined from a calculation that in the device the air is forced into the lower chamber. When the power load is heated fluid in the lower chamber. In boiling liquid vapor is collected in the funnel, enters the steam and forth, displacing the air that extends from the upper chamber. The process is accompanied by the increase of pressure in the system, resulting in a volume of air originally contained in thermosyphon decreases. The steam line 3 and the cover of the cylinder 2 is arranged so that the jet of steam is directed to the cooled cylinder walls where condensation of the steam. The result of forcing air from the inner surface of the cylinder, the intensity of the condensation process is increased, and the pressure in the system decreases. A large part of the air from the upper chamber accumulates at the bottom. If the stage of the start system load gradually increase to values larger than nominal, then the pressure in the system reaches a certain value, in which the work is installed in the lower chamber of the valve and the part of the air will come out of thermosyphon. Working pressure decreases, the intensity of condensation increases. The reduction in operating pressure in the system will lead to a decrease in losses of the working fluid, which will increase the time of operation of thermosyphon without refueling.

The use of the proposed device allows to significantly increase the efficiency of heat transfer in thermosyphon from the heated portion to the cooled area, thus increasing the operating time of thermosyphon without refueling.

Calculations and experimental studies [Kabov O.A., Chinnov E.A. Vapor-gas mixture condensation in a two-chamber vertical thermosyphon. Journal of Enhanced Heat Transfer. 2002, Vol.9, pp.57-67] showed that the considered design of thermosyphon provides heat input capacity of 2 kW for low-oil switch series TDC when the height of the capacitor 830 mm and an external diameter of 50 mm is used as the working fluid of water with 40% by weight by the addition of isopropyl alcohol.

thermosyphon, comprising a housing, a working volume of the lower chamber which is filled with fluid, a funnel, which is blocked by the lower chamber with the steam line for transporting steam, the steam in the lower chamber and the condenser in the upper chamber, characterized in that the condenser is cooled surface of the upper chamber of thermosyphon, frequent the lower chambers reserved for the accumulation of air and other gaseous impurities, originally contained in thermosyphon, while in the lower chamber has a valve for dropping part of the air to the outside.



 

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