JPS6039654Y2 - heat transfer device - Google Patents

Description

[Detailed explanation of the invention] This invention is based on the phase change of the working fluid sealed in the piping,
The present invention relates to a heat transfer device that transports heat from a heat collector to a radiator by the reflux action of liquid due to gravity.

Conventionally, there has been a device of this type as shown in FIG.

In the figure, 1 is a heat collector that receives heat from sunlight, and 2 is a heat radiator placed indoors, which is placed higher than the heat collector 1.

3A and 3B are pipes communicating between the heat collector 1 and the heat radiator 2, and both ends of the pipe 3A are connected to the lower portions of the heat collector 1 and the heat radiator 2, respectively.

Further, both ends of the pipe 3B are connected to the upper portions of the heat collector 1 and the heat radiator 2, respectively.

4 is a valve disposed in the middle of the pipe 3A, 5 is a reservoir bar, and the lower part of the reservoir 5 is connected to the pipe 3A between the valve 4 and the radiator 2 through a pipe 3C.

At this time, the reservoir 5 is located higher than the heat collector 1 and lower than the heat radiator 2.

Note that the volume of the reservoir 5 is set to such an extent that it can store the liquid working fluid for the entire device.

A working fluid such as fluorocarbon or water is sealed inside 1 to 5 described above, and the amount thereof is such that the heat collector 1 is filled with the liquid working fluid during operation.

Next, the operation will be explained.

First, when operating, the valve 4 is opened.

When sunlight hits the heat collector 1 in this state, the heat collector 1 is heated, the working fluid inside it takes away the heat of evaporation and evaporates, and due to the slight pressure difference with the heat radiator 2, the pipe 3B and reaches the radiator 2, where it is cooled, releases heat of condensation, and liquefies.

Due to the action of gravity, the working fluid liquefied in the radiator 2 passes through the pipe 3A from the lower part of the radiator 2 and flows back to the heat collector 1 located at a lower position than the radiator 2.

By repeating the above operations in sequence, it becomes possible to take the heat of sunlight into the room and heat the room without using power.

Further, the valve 4 is closed when there is no need to heat the room, such as in the summer.

In this state, the working fluid that has condensed and liquefied in the heat radiator 2 cannot flow back to the heat collector 1, so the device The heat transport effect of the air will stop, and the room will no longer be heated.

At this time, the working fluid condensed and liquefied in the radiator 2 is transferred to the pipe 3A.
, 3C and is located lower than the heat sink 2.
It accumulates in

After this, if it is desired to perform the heat transport action again, the valve 4 may be opened.

When the valve 4 is opened, the liquid working fluid accumulated in the reservoir 5 flows into the heat collector 1 through the pipes 3C and 3A under the action of gravity, and begins to transport heat according to the operating principle described above.

Since the conventional heat transfer device is configured as described above, when the valve 4 is closed and the operation is stopped, the temperature of the heat collector 1 exposed to the outside air becomes lower than that of the radiator 2 placed indoors. Condensation and liquefaction of the working fluid occurs in the heat collector 1, contrary to the normal operation, and the pressure in the heat collector 1 becomes lower than the pressure in the reservoir 5 and the radiator 2.

Then, the liquid working fluid that had been accumulated in the reservoir 5 will flow from the pipes 3C and 3A to the heat collector 1 through the radiator 2 and the pipe 3B.

In this way, once the pipe 3B is filled with liquid, when restarting, the steam generated in the heat collector 1 must flow through the liquid in the pipe 3B to the radiator 2, so the pressure loss is extremely high. This resulted in a disadvantage that the amount of heat transport decreased significantly.

This idea was made to eliminate the drawbacks of the conventional ones as mentioned above, and a reservoir is provided in the middle of the piping to guide the liquid condensed in the radiator to the heat collector. By filling an appropriate amount of non-condensable gas into
When operation is stopped, non-condensable gas fills the heat collector and the piping that guides the steam evaporated in the heat collector to the radiator.
It is an object of the present invention to provide a heat transfer device that prevents liquid in a reservoir from flowing to a heat collector and has reliable restartability.

An embodiment of this invention will be described below with reference to the drawings.

In FIG. 2, 1, 2.3A, 3B, 3C, and 4 are the same as those of the conventional heat transfer device in FIG. 1, so the explanation thereof will be omitted.

6 is a reservoir, 7 is a non-condensable gas sealed in the reservoir 6, and the upper part of the reservoir 6 and the working fluid outlet side end of the radiator 2 are connected through a pipe 3D.

In the above configuration, the amount of non-condensable gas 7 is approximately the sum of the volumes of the heat collector 1, piping 3B, and radiator 2 at the pressure when the operation is stopped, and the volume of the reservoir 6 is the same as that of the entire device. The reservoir 6 is large enough to store the liquid working fluid, and is large enough to store the non-condensable gas 7 in the reservoir 6 at the pressure during operation.

Note that the position of the reservoir 6 is the same as in the conventional example, so a description thereof will be omitted.

In this embodiment as well, the heat transport principle of the heat transfer device is similar to the conventional heat transport principle described above.

In this device, when the valve 4 is closed to stop the operation, the pressure inside the collector 1 becomes lower than the pressure during operation, so the non-condensable gas 7 in the reservoir 6 is transferred to the pipe 3D,
It flows into the heat collector 1 through the heat radiator 2 and piping 3B, and equalizes the pressure of the entire device.

That is, when the pressure inside the heat collector 1 becomes low, the liquid working fluid stored in the reservoir 6 does not come out of the reservoir 6, but instead, the non-condensable gas 7 that was in the upper part of the reservoir 6 comes out. (Thus, liquid will no longer flow into the pipe 3B.

In addition, non-condensable gas 7 is added to the heat collector 1, piping 3B, and radiator 2.
To restart the system from a state where it is full, just open the valve 4 as in the conventional system.

When the valve 4 opens, the liquid working fluid stored in the reservoir 6 flows into the heat collector 1 due to the action of gravity, and if the heat collector 1 is heated by sunlight, it absorbs the heat of evaporation and becomes a high-pressure fluid. It becomes steam and flows to the radiator 2, which has a lower pressure than the heat collector 1.

The non-condensable gas 7 that had been in the heat collector 1, piping 3B, and radiator 2 until then is pushed by the steam and passes through the piping 3D and accumulates in the reservoir 6. After this, heat transport according to the heat transport principle described above is carried out. It will be done.

In the above explanation, it has been explained that the heat transfer device can be reliably restarted by filling the reservoir 6 with the non-condensable gas 7. However, as a secondary effect of the present invention, the working fluid with low evaporation pressure is The points that can be used are also explained below.

In conventional heat transfer devices, when non-condensable gas 7 gets mixed into the piping, it is blocked in the radiator 2 and heat transport is inhibited.

Therefore, in order to eliminate slow leakage of air from the piping, the working fluid has been selected to have a vapor pressure greater than atmospheric pressure at the lowest ambient temperature in which the heat transfer device is placed.

For example, if the minimum ambient temperature is 120°C, R-12 seems to be suitable as a fluorocarbon-based working fluid with a vapor pressure of 1.5 ka/rd, but if the temperature rises (100°C
The vapor pressure of about 34 ko/d) is dangerous and is therefore generally inappropriate.

In other words, in the past, it was necessary to either reduce the amount of heat transport due to slow leakage or increase pressure.

However, since the heat transfer device according to the present invention is configured on the assumption that non-condensable gas 7 will be mixed in from the beginning, even if a working fluid with low vapor pressure is used, non-condensable gas will be mixed in during non-operation. 7 has the advantage of not affecting performance by configuring it so that the pressure is around atmospheric pressure.

As described above, according to this invention, the working fluid outlet side end of the radiator and the upper part of the reservoir are connected through piping, and the reservoir is configured to be filled with an appropriate amount of non-condensable gas. This has the practical effect of making it possible to reliably perform the above operations, and widening the selection range of working fluids.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a conventional heat transfer device, and FIG. 2 is a configuration diagram showing a heat transfer device according to an embodiment of this invention. In the figure, 1 is a heat collector, 2 is a heat radiator, and 3A. 3B, 3C, and 3D are pipes, 4 is a valve, 5 and 6 are reservoirs, and 7 is a non-condensable gas. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (2)

[Scope of utility model registration request] (1) Consisting of a heat radiator and a heat collector located above and below in a loop-shaped pipe, the position at the bottom of the pipe is created by the phase change of an appropriate amount of working fluid sealed inside and the reflux action due to gravity. In a device that transports heat from the heat collector to the heat radiator located above, a reservoir is provided in the middle of the piping for guiding the liquid condensed in the heat radiator to the heat collector, and a reservoir is provided inside the reservoir to prevent condensation. A heat transfer device characterized by enclosing an appropriate amount of a reactive gas. (2) The heat transfer device according to claim 1, wherein the working fluid outlet side end of the radiator and the upper part of the reservoir are communicated with each other by a pipe.