RU2435122C1 - Operating method of high-temperature heat pipe, and high-temperature heat pipe - Google Patents

Abstract

FIELD: heating. ^ SUBSTANCE: in heating zone of heat pipe, after fusion of heat carrier and its heating to temperature |tb - (20 80C) |, the heating zone of heat pipe with heat carrier is irradiated in frequency range compatible with frequency of oscillations of atom electrons, heat carrier, where tb - heat carrier boiling temperature. Heat pipe containing heating zone, automated operation control system is equipped with oscillation generator, device for supplying oscillations to heating zone of heat pipe, which is made from material stable at high temperatures and not having any resistance to passage of oscillations emitted in it, for example from quartz. ^ EFFECT: increasing heat transfer coefficient at boiling of heat carrier within the specified temperature range and increasing the amount of heat transferred with heat pipe. ^ 2 cl, 1 dwg

Description

The invention relates to heat engineering, in particular to heat transfer by heat pipes.

A known method of operation of a heat pipe [1. Seeds M.G., Gershuni A.N., Zaripov V.K. Heat pipes with metal fiber capillary structures. K .: Vishka school. Head Publishing House, 1984. 215 pp.], Which consists in supplying heat with heating, melting, evaporation and boiling of the heat carrier in the heating zone of the heat pipe, heat transfer by the heat carrier to the cooling zone with condensation of the heat carrier on the wall and heat transfer through the wall to the cooling medium.

The disadvantage of the method of operation of the heat pipe [1] is that, ceteris paribus, the amount of heat absorbed and transmitted by the heat pipe depends on the thermophysical properties of the coolant and its boiling point.

The inventive method aims to expand the temperature range of the heat pipe and increase the efficiency of heat transfer.

The technical result obtained by the implementation of the proposed method is to increase the heat transfer coefficient upon boiling of the coolant in a given temperature range and increase the amount of heat transmitted by the heat pipe.

The inventive method is characterized by the following essential features.

Limiting signs: heat supply to the heat pipe heating zone, heating, melting, evaporation and boiling of the heat carrier, heat transfer by the heat carrier to the heat pipe cooling zone with condensation of the heat carrier on the wall and heat transfer of the heat carrier to the cooling medium.

Distinctive features: after melting the coolant and heating it to the temperature t _к - (20 ÷ 80 ° C) , the heating zone of the heat pipe with the coolant is irradiated in the frequency range comparable to the oscillation frequency of the electrons of the coolant atoms, where t _к is the boiling point of the coolant .

A causal relationship between the totality of the essential features of the proposed method and the achieved technical result is as follows.

Melting of the heat carrier and its heating to a temperature of t <(t _to -80) ° С (where t _to is the boiling point of the heat carrier) with irradiation of the heating zone of the heat pipe with the heat carrier in the frequency range comparable to the oscillation frequency of the electrons of the coolant atoms does not lead to a significant increase the heat transfer coefficient during evaporation of the coolant.

The melting of the coolant and its heating to a temperature t> (t _to -20) ° C, followed by the irradiation of the heating zone of the heat pipe with the coolant in the frequency range comparable to the oscillation frequency of the electrons of the coolant atoms, makes it inefficient to use the possibility of increasing the efficiency of heat transfer during boiling of the coolant .

An increase in the heat transfer coefficient of the heat carrier during its boiling, which increases the efficiency of heat transfer by the heat pipe, consists in irradiating the heating zone in the frequency range comparable to the oscillation frequency of the electrons of the heat carrier atoms, in increasing the rate of formation of new boiling centers and increasing the frequency of their separation from the heating surface.

To implement the proposed method, a heat pipe is claimed, the prior art of which is known [2, 3].

Known installation [2. Patent for PM No. 41427 RU. Installation for coating a cylindrical pipe / V.V. Stulov et al. Publ. 10/27/2007. Bull. No. 30], contains a vertically arranged cylindrical pipe made in the form of a heat pipe with a heating zone and with a built-in electric heater connected to the automatic control system of the installation.

A known device for cooling the mold to obtain continuously cast deformed billets of high-temperature metals [3. Patent No. 2323232 RU. Publ. 04/20/2008. Bull. No. 11], containing high-temperature cylindrical heat pipes installed in the vertical channels of the pair of working walls of the mold, the heating zones of the heat pipes are installed by tight fit in the lower vertical section of the walls of the mold.

A disadvantage of the known installation [2] and device [3] are the limitations of the transmitted heat flow, determined by the thermophysical properties of the coolant in the cylindrical pipe.

The technical result obtained by the implementation of the inventive heat pipe is to increase the reliability of its operation in a wider temperature range.

The inventive heat pipe is characterized by the following essential features.

Limiting signs: high-temperature heat pipe with a heating and cooling zone, with an automated control system for the operation of the heat pipe.

Distinctive features: it is equipped with a generator of radiated vibrations, a device for introducing vibrations into the heat pipe heating zone, made of a material that is stable at high temperatures and does not resist the passage of radiated vibrations in it, for example, from quartz, a thermocouple in the heating zone and a thermocouple in the heat cooling zone pipes.

A causal relationship between the totality of the essential features of the claimed heat pipe and the achieved technical result is as follows.

The presence of a radiation generator allows you to generate oscillations and feed them into the heating zone of the heat pipe.

The presence of a device for introducing vibrations into the heat pipe heating zone makes it possible to set the density of the vibration energy introduced into the metal.

The manufacture of a device for introducing vibrations into the heat pipe heating zone from a material stable at high temperatures, for example, quartz, increases the device's service life and ensures reliable operation of the heat pipe.

The manufacture of a device for introducing vibrations into the heat pipe heating zone from a material that does not resist the passage of radiated vibrations in it, for example, from quartz, eliminates the heating of the device, which ensures its reliable operation throughout the entire operation period.

The presence of a thermocouple in the heating zone and a thermocouple in the cooling zone of the heat pipe allows you to receive signals from them during the heating and operation of the heat pipe with its irradiation in the frequency range comparable to the oscillation frequency of the electrons of the coolant atoms and the processing of the incoming signals in the automatic control system of the pipe.

The drawing shows the appearance of the inventive high-temperature heat pipe for the implementation of the proposed method of operation of the heat pipe.

The inventive high-temperature heat pipe in the drawing consists of a heating zone 1 with a coolant, for example sodium, a cooling zone 2, a generator 3 of emitted oscillations with a device 4 for introducing oscillations into the heating zone, thermocouples 5 and 6 connected to the automatic control system of the heat pipe.

The method of the inventive high-temperature heat pipe is as follows.

When heat is supplied to the heating zone 1 of the heat pipe, heating, melting, and evaporation of the coolant occurs, which is recorded according to the readings of thermocouple 5. When the coolant is heated to a temperature of t _to - (20 ÷ 80) ° C (where t _to is the boiling point of the coolant), fixed using a thermocouple 5, they turn on the oscillation generator 3 with irradiation of the heating zone of the heat pipe 1 with a coolant in the frequency range 1-5 MHz, using the oscillation input device 4 in the frequency range comparable to the frequency of the electrons of the coolant atoms. The heat transfer to the cooling zone 2 of the heat pipe is fixed according to the readings of thermocouple 6. After condensation of the coolant on the wall of the heat pipe in the cooling zone 2, heat is transferred from the coolant to the cooling medium. By adjusting the power of the generator with the emitted oscillations, the time to reach the set temperatures according to the readings of thermocouples 5 and 6 is recorded, which allows the automatic control system of the heat pipe to select the most appropriate frequency of irradiation of the heat pipe, increasing its efficiency.

Claims (2)

1. The method of operation of a high-temperature heat pipe, including the supply of heat to the heat pipe heating zone, heating, melting, evaporation and boiling of the heat carrier, heat transfer by the heat carrier to the heat pipe cooling zone with condensation of the heat carrier on the wall and heat transfer of the heat carrier to the cooling medium, characterized in that coolant after melting and heating to a temperature [t _k - (20 ÷ 80 ° C)] produce a radiation heating zone of the heat pipe with the coolant in the frequency range comparable with the oscillation frequency RE new coolant atoms wherein t _k - coolant boiling temperature. 2. High-temperature heat pipe containing a heating and cooling zone, an automated control system for the operation of the heat pipe, characterized in that it is equipped with a generator of radiated vibrations, a device for introducing vibrations into the heating zone of the heat pipe, made of a material that is stable at high temperatures and does not render resistance to the passage of emitted oscillations in it, for example from quartz, with a thermocouple in the heating zone and a thermocouple in the cooling zone.

Images