Heat-transferring device

FIELD: applicable for heat abstraction in various media.

SUBSTANCE: the heat transferring device has a sealed pipe with condensation and evaporation zones filled up with a heat-transfer agent with pockets provided on the inner surface, the pockets used for inhibition of draining condensate are located in the evaporation zone and made annular or formed by the sections of the helical surface adjoining the pipe inner wall with its lower edge at an acute angle, which are separated from one another by radial partitions, the annular pocket is formed by the side surface of the truncated cone, adjoining the inner wall of the mentioned pipe with the larger base. Besides, at least some of the pockets located one above other are positioned at such a distance that a capillary effect occurs between the surfaces facing one the other.

EFFECT: enhanced efficiency of heat transfer due to the increase of the pipe surface wettable by the heat-transfer agent, as well as simplified structure an facilitated actuation of the device.

3 cl, 7 dwg

 

The invention relates to the field of heat transfer devices and can be used for heat dissipation in different environments, in particular for artificial freezing of soils during the construction of various structures in complex engineering-geological conditions, for example in areas of permafrost. The invention can be used in ground source heat pumps, as well as for extended cooling structures, such as lasers, vertical or close to that location.

Known heat transfer device, in particular for freezing of Foundation soil under construction (as of the USSR № 872640, E 02 D 3/115, 1981). This heat transfer device includes a vertical condenser and embedded in soil with a slope to the horizon evaporator made in the form of partially filled with low-boiling liquid agent pipes, with each pipe is made along the length of the polyline with alternating ascending and descending sections.

In cold season a pair of low-boiling liquid agent condensed on the inner surface of the condenser and flowing down. Further, the condensate flows through the pipe of the evaporator to her first trench between top-down and bottom-up areas, where a small portion of the condensate evaporates, and the remainder flows to the next hollow pipe of the evaporator, in which sparyatsya the next portion of the condensate, and the rest flows down next to the next trough of pipe, etc. Evaporation of low-boiling condensate liquid agent is accompanied by absorption of heat, which is taken from the Foundation soil under the structure that accompanied it cooled.

The disadvantages of this known device is the presence of evaporation in the small height of the layer, due to the almost horizontal position of the evaporation zone of the pipe, as well as the complexity of manufacturing and the non-uniformity of the temperature field, which reduces the efficiency of freezing and making it difficult to start the device after warming capacitor.

Known heat exchanger, a heat pipe (patent RF № 2083941, IPC F 28 D 15/04, publ. 10.07.97 g)containing partially filled with the working environment partitioned evaporator, vapor-liquid collector and the condenser, the evaporator section is connected to the collector directly, the walls inside are equipped with matchlock coating, and the condenser is located in its cavity.

Vapor of the working medium condenses on the walls of the sections of the condenser and flows to the wick. Due to the excess of the liquid phase of the working environment in the wick ensure a reliable contact with the walls of the lower section and the upper section of the reservoir and the heat from the cooling medium. The wick when it performs the main functions R is Opredelitel capacitor between sections evaporative surface or pipe, where drains the condensate from the upper wick section of the collector. The cooling medium passes in the sections of the condenser and, sensing the heat of condensation, heat up.

The disadvantage of this design is that the heat pipe has a limited length and therefore not applicable in those cases where you want the heat on longer spans.

Closest to the proposed device is the liquid-vapor device for freezing soil (A.S. USSR № 1543007, E 02 D 3/315, 15.02.90).

This device provides for the liquid phase coolant from the condenser to the evaporator heat pipe first in the Central axial part of the tube without touching the sides of the pipe, then the pipe walls. In the inner part of the pipe entered the condensate and condensatevertical. Thus, the inner tube is divided into three zones: the area of the capacitor, in which the fluid flow along the walls flows to the condensate, the area of the condensate to contentstore.deleted, in which the liquid phase is moved along the axis of the pipe without touching the walls of the pipe, and the area of the evaporator, where the liquid phase flows down the walls of the pipe and takes heat from the ground. The condensate is made in the form of a cone plate with axial drain pipe. Condensatevertical made in the form of an inverted Cup-spray with ekovymi Windows leaning against the wall, installed with a gap relative to the casing wall. The wall of the housing with a partition wall are connected by a ring made of a porous material. Below contentstore.deleted on the inner surface of the housing annular groove for aligning the flow of the refrigerant and its uniform distribution on the inner surface of the shell.

This known device is not a high efficiency, because the heat carrier moistened with a small surface of the pipe. In addition, it has a complex structure, and run it difficult.

The technical problem solved by the present invention is to increase efficiency by increasing the pipe surface wetted by the coolant. Other results provided by the invention are to simplify the construction and facilitate the launch of the device.

The problem is solved as follows.

The inventive heat transfer device as specified above, the closest known device comprises a sealed tube with areas of condensation and evaporation, refilled the coolant, on the inner surface of which there are pockets, and according to the invention pockets that are essential for retaining the flowing condensate, are located in the area of the COI is to be placed and executed circular or formed parts of the spiral surface, adjacent to its lower edge at an acute angle to the inner wall of the pipe, which are separated from each other by radial partitions, and an annular pocket formed in a lateral surface of a truncated cone adjacent large base to the inner wall of the specified pipe.

According to the second paragraph of the invention, at least some of the located one above the other pockets are located at such a distance, that between them facing each other of the surfaces takes place by the capillary effect.

Under the third paragraph of the invention in heat-exchange device is the alternation of the capillary and acapillary pockets.

Thus, thanks to the inner wall of the pipe in the zone of evaporation pockets which retain the condensate flowing down the inner surface of the pipe is achieved by increasing the pipe surface wetted by the coolant, and hence the efficiency of the device. In addition, the proposed device is simpler in construction and in operation.

Pockets made on the inner wall of the pipe in the zone of evaporation can be carried out of the ring. In particular, each annular pocket can be formed adjacent to the inner wall of the pipe lateral surface of a truncated cone, premikudu the large base to the inner wall of the pipe.

It is also possible the formation of pockets separated from each other by radial partitions, parts of the spiral surface, adjacent its lower edge at an acute angle to the inner surface of the pipe.

Annular pockets can be located at the height of such a small distance from one another that between them there is a capillary effect. If such annular pockets are grouped in pairs so that the distance between the pockets adjacent pairs does not satisfy a specified condition, it will be an alternation acapillary and capillary pockets.

Can be similarly made and the pockets formed by the spiral surface. For example, when performing a helical surface with a sufficiently small step capillary action will take place between any adjacent on the height of the turns of the spiral. In case of execution of the spiral surface dvuhaktnoy with a small distance between the coils of different approaches and a relatively large step capillary effect will occur only in small gaps between adjacent coils belonging to different approaches. In this case, will be the alternation of the capillary and acapillary pockets.

Due to the presence of the capillary effect of the condensate in the respective pockets forms a meniscus, and the surface is evaporated the ia increases, and in the pockets formed by the spiral surface, it also reduces the rate of draining of condensate.

In all cases, the amount of the charged carrier must be greater than the total volume is made on the inner wall of the capillary tube and/or acapillary pockets.

The invention is illustrated by drawings.

Figure 1 shows a heat transfer device in the section.

Figure 2 and figure 3 are examples perform a loop back pockets.

Figure 4 shows the heat transfer device with pockets formed by parts of the spiral surface.

Figure 5 shows the form And the heat transfer device depicted in figure 4.

Figure 6 shows the heat transfer device with pockets formed by parts of the spiral surface with capillary pockets.

7 shows a view of the heat transfer device depicted in Fig.6.

The heat transfer device comprises (1) a pipe 1 with condensation zones 4 and evaporation 5. The arrows indicate the direction of the sum of heat Q in the evaporation zone and the discharge of heat Q in the condensation zone. The pipe is filled with fluid 3. As the heat can be used ammonia or freon-22. On the inner wall of the pipe in the zone of evaporation is performed pockets 2.

The pockets shown in figure 2, is made circular. Pocket on Radovan adjacent to the pipe wall lateral surface of the cone 10, extending in the direction of the condensation zone, that is the bottom base of the cone over the top and its diameter equal to the diameter of the inner pipe wall.

In this case, the condensate 9, trickling down the wall of the pipe 1, is delayed in the pockets uniformly throughout the wall of the evaporator 5. Evaporation of condensate 9 occurs due to the heat extracted from adjacent to the evaporator environment. In contact with the evaporator medium evenly cooled throughout the length of the evaporator 5.

There may be other versions of the pockets described above in connection with the disclosure of the invention.

The annular pocket, shown in figure 3, is formed in the pipe, consisting of a thin metal layer 7, for example, aluminum or steel, coated on the outside over the entire surface of the composite material 6 forming a rigid frame. The annular pocket in this case is also made in the form attached to the pipe wall of the cone 8, extending in the direction of the condensation zone 4.

Pocket, shown in figure 4, formed part of the spiral surface 11 adjacent one of its edge at an acute angle to the inner surface of the pipe 1. Part of the spiral surface 11 are separated from each other by radial partitions 13, shown in figure 5.

The pockets can be made of the capillary (6), i.e. such that the condensate better fills the space is between the wall of the pocket by the forces of surface tension. A possible embodiment of alternating between the capillary and acapillary pockets. In this case, only one radial partition in turn, formed, for example, the wall of the longitudinal groove 12 along the entire length of the pipe (6).

If the pockets are made with a small capillary pressure, the liquid is near the septum in each section of the spiral pocket. If the capillary pressure is sufficient, the fluid fills the entire section length in one turn.

The device operates as follows.

A pair of carrier 3 rise in the condensation zone 4, is condensed on the wall of the pipe and flows into the evaporation zone 5. When driving down the wall, the liquid fills the pockets, evenly distributed over the surface of the evaporation zone. Evaporation of condensate is accompanied by absorption of heat withdrawn from the adjacent contact with the surface of the pipe environment. Thus, the environment in which you place the proposed heat transfer device is cooled. As the evaporation and subsequent condensation pockets again replenished flowing coolant. The length of the pipe, the depth of the pockets and the frequency of their locations are selected depending on the required temperature of the cooling medium.

Thus, the design of the proposed device as simple as possible, because it is the mechanical part is different from the usual pipe only by the presence of pockets on its inner wall. Any special steps to start tucked the device is not required.

The device can be used for freezing and heating of the soil, ground source heat pumps for cooling of extended structures, such as lasers with a vertical arrangement, and has other applications.

1. Heat transfer device containing a sealed tube with areas of condensation and evaporation, refilled the coolant, on the inner surface of which there are pockets, characterized in that the pockets that are essential for retaining the flowing condensate, are located in the evaporation zone and made circular or formed parts of the spiral surface, adjacent its lower edge at an acute angle to the inner wall of the pipe, which are separated from each other by radial partitions, and an annular pocket formed in a lateral surface of a truncated cone adjacent large base to the inner wall of the specified pipe.

2. The device according to claim 1, characterized in that at least some of the located one above the other pockets are located at such a distance, that between them facing each other of the surfaces takes place by the capillary effect.

3. The device under item 1, characterized in that it is the alternation of the capillary and acapillary to Romanov.



 

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