JPS58173341A - Solar heat water heater - Google Patents

Abstract

PURPOSE:To perfectly separate an outbound path of a coolant from an inbound path thereof and to improve a heat transfer efficiency and a collecting efficiency, by a method wherein, in a connection of a collecting part, formed by connecting in parallel a plurality of collecting pipes, to a radiating part, the outbound pipe is coupled to the lower side of the radiating part and the collecting part, and the upper part side of the collecting pipes is open at least above a flow down liquid surface of a liquefied coolant in the connection. CONSTITUTION:Gas is produced at a collecting part 10 and disappears at a radiating part 9, and thereby a gas coolant normally moves to the radiating part 9 through an inner tube 16 from an upper header 13 of the collecting part 10. Thus, the upper header 13 and the inner tube 16 form an outbound path. Meanwhile, a liquid coolant moves such that liquid is produced at the radiating part 9 and disappears at the collecting part 10, but it flows down under gravity along a gradient for a time ranging from the production to the disappearance, it flows down to a lower header 14 from an inbound pipe 17 after passing through an outer tube from the radiating part 9, and it flows in collecting pipes 12a-12g from the lower header 14. Thus, the outer tube.inbound pipe 17 and the lower header 14 form an inbound path. Besides, since the inner tube 16 of a double structure is open above a liquid surface of a connection part 15, a liquid coolant is prevented from flowing in the inner tube 16, and this enables the complete separation of the outbound path from the inbound path.

Description

[Detailed description of the invention] This invention relates to a solar water heater.

The solar water heater that forms the basis of this invention is shown in Figure 94. That is, a plurality of heat sinks At, where the refrigerant is cooled by water, releases latent heat and condenses (converts from gas to liquid), and a heat receiving section At, which is disposed in the heat storage tank B, and where the refrigerant receives solar heat and boils and evaporates. The heat collecting pipe D is composed of two heat collecting pipes D, and the upper and lower ends of each heat collecting pipe D are delayed by an upper header E and a lower header F, respectively, and one end of the upper header E is connected to a heat radiation 56A. It is usually sloped so that the refrigerant can easily circulate between the heat radiation part A and the heat reception part sC.

However, in this solar water heater, the refrigerant that evaporates in the heat receiving part C and flows upward to the heat radiating part A, and the refrigerant that liquefies in the heat radiating part A and flows down the slope, mix at the connecting part G. A phenomenon occurs in which the flow of the refrigerant is obstructed, resulting in poor circulation of the refrigerant, resulting in a reduction in the heat transport ability of the pipe. In addition, the return path of the refrigerant liquefied in the heat radiating section A flows down from the connecting section G to the upper header E of the heat receiving section C and the heat collecting pipe D of 1jg1, and passes through the upper header E to #I2. Third fever collecting tube D2. The process is to groove D3 one after another. However, as a result, the heat collection pipes D6 to D8 on the far side are not sufficiently reached, and the evaporation/condensation cycle is often performed without being filled with liquid refrigerant. For convenience, in the figure, dots represent 9 liquid refrigerants, and small circles represent gas refrigerants. As a result, the heat collection pipes D6 to D8 do not sufficiently collect heat by latent heat, and the gaseous refrigerant only receives heat as sensible heat, resulting in a drawback that the heat collection efficiency of the heat receiving section C as a whole deteriorates.

Therefore, an object of the present invention is to provide a solar water heater that can improve heat transport capacity and heat extraction efficiency.

A solar water heater according to the #I1 embodiment of the present invention is shown in Figures #I1 and 2. That is, this solar water heater has a tank cover 2 provided at the upper end of a flat outer case 1, and a pair of heat storage tanks 3m+3b inside the tank cover 2.
internally, the tanks 3a and 3b are slowed down, and one tap 31 is provided with a distern 4, a water supply pipe 6t is connected via a ball tap 5, and a hot water supply pipe (not shown) is connected to the other tank 3b. are doing. A pair of heat pipes 7 a e 7 b are installed in the outer case 1, and the upper surface is covered with glass 8. Each of these heat pipes 7a and 7'yb has a heat radiation S (condensation S) 9 and a heat receiving part. (Evaporation section) 10, and the heat dissipation section s9 has a large number of fins 11 stretched on the two sides, and the IEIsK in each tank 3a, 3b are arranged with a predetermined slope. As shown in the figure, a plurality of heat collecting pipes 12! to 12g are arranged in parallel, and their upper and lower ends are connected to each other by an upper header 13 and a lower nodder 14.The heat radiation m9 connection 1115 and the heat receiving part 10 is connected as follows. That is, an inner pipe I6 is provided at the connection part 15 of the heat radiation s9 to form a double pipe structure, and the inner pipe 16 and one end of the heat receiving [10,/) upper header 13 are connected. The upper end of the return pipe 17 is connected to the outer pipe (connection 515) of the double pipe section, and the lower end thereof is connected to one end of the lower hender 14 of the heat receiving section 10. The position of the inner tube 16 in the outer tube is such that when the outer case l is disposed at a predetermined slope and a cycle operation is performed, the inner tube 16 is in contact with vc.
It is assumed that @15 is located above the liquid level of the flowing liquid refrigerant. Note that the dots inside the heat pipe indicate liquid refrigerant.
Komaru is gas P! # Indicates medium.

This solar water heater is installed on the roof of a building at a predetermined slope with the tank cover 2 side on top.
a * 7 b contains a refrigerant, for example Freon (R-11
3) etc. are sealed in the heat receiving part 10 to the extent that it is filled once, and if the hot water supply pipe of the tank 3b is closed and the water supply pipe 6 is connected to the water supply, the tank 3a,
3b is filled with water to a predetermined water level. When the heat collecting pipes 12ss to 12g are heated through the glass 8 by daytime solar heat, the liquid refrigerant inside is heated and boils and evaporates, and this gaseous refrigerant passes through the upper header 13, which is on the upper side of the slope, and flows into the inner pipe. 16 and fills the heat dissipating section 9, heating its pipes and fins 1, thereby heating the water that comes into contact with them. Broadcast M#9r! Since it is arranged at the bottom of the tanks 3m and 3b, the heated water rises to the water surface by convection, and the cold water is constantly in contact with the fins 11 and the like and is heated. The gaseous refrigerant that has radiated latent heat in this way is condensed and liquefied, and the liquid refrigerant is connected s1 along the gradient of heat radiation @9.
5, and further flows below the inner pipe 16 without flowing into the inner pipe 16, flows into the return path vibe 17 connected to the outer pipe, and flows down to the lower header 14. Further lower header 14
The liquid flows evenly into each of the heat collecting pipes 12a to 12d, and is distributed by gravity so that the liquid levels in the heat collecting pipes 12a to 12d are always equal. In this way, it absorbs solar heat again, evaporates, and transfers to the heat dissipation section 9 through the above-mentioned route.

The cycle of the refrigerant is repeated in this way, but to further explain the operations of the gas refrigerant and the liquid refrigerant in detail, in the gas refrigerant, gas is generated at the heat receiving part 9, and gas is generated at the heat radiating part 9. Since the heat disappears and a pressure difference is generated there, it always moves from the upper header 13 of the heat receiving part 10 through the inner pipe 16 to the heat radiating part 9.

Therefore, the upper header 13 and the inner pipe 16 serve as the outward path for the refrigerant. On the other hand, the liquid refrigerant is generated in the heat radiating part 9 and disappears in the heat receiving part 10, but during that time, it flows down by gravity according to the gradient, and passes from the heat radiating part 9 through the outer tube to the return vibrator 1.
7 to the lower header 14, and from the lower header 14 to each of the heat collecting pipes 12a to 12g. Therefore, the outer pipe, the return pipe 17 and the lower header 14 form the return path.

Moreover, since the inner pipe 16 of the double pipe section opens above the liquid level of the connecting part 15, the liquid refrigerant does not flow into the inner pipe 16, and therefore the forward and return strokes of the refrigerant are completely controlled. They will be separated.

With this configuration, in this solar water heater, the gas refrigerant and the liquid refrigerant do not mix at the connection part of the heat radiation part and their mutual flow is not obstructed, unlike in the conventional case. Therefore, the heat transport ability of the heat pipe is improved compared to the conventional one. At the same time, the recirculating liquid refrigerant flows from the lower header into each heat-collecting pipe, and unlike the conventional method, it does not flow into the upper header at all, so the liquid level of all the heat-collecting pipes is always IWl, and some Since all the heat collecting pipes perform latent heat exchange without the heat collecting pipes exchanging sensible heat as a gas refrigerant, the overall heat exchange efficiency is improved compared to the conventional method.

In addition, as a modification, the upper header ~ 13 may be opened above the flowing liquid level of the connecting portion 15 instead of the double pipe.

A solar water heater according to a second embodiment of this invention is shown in #I3. That is, this has the tip of the inner tube 16' extended to the middle position of the heat radiating section 9. The heat dissipating part 9 has a small liquid surface depth at the tip of the liquefied liquid refrigerant, so it is easy to manufacture because there are few restrictions on the arrangement of inner tubes, and it is possible to completely separate the cold and cold circulation path. It's easy.

As described above, in the solar water heater of the present invention, in the connection between the heat receiving section formed by connecting a plurality of heat collecting bis 1 in parallel and the heat radiating section, the return pipe is connected to the lower side of the heat radiating section and the heat receiving section. Since the upper side of the heat collection pipe is opened at least above the flowing liquid level of the liquefied refrigerant in the connection part, the outgoing and returning paths of the refrigerant can be completely separated, improving heat transport efficiency and reducing the flow of liquid refrigerant. Since the heat can be returned to each heat collecting pipe from the lower end communication part of the heat receiving part, there is an effect that the heat collecting efficiency can be improved.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of a solar water heater according to the first embodiment of the present invention, Fig. JI2 is a schematic XF-plane view thereof, and Fig. 3 is a schematic plan view of the second embodiment. FIG. 1 is a schematic plan view of a solar water heater that is the basis of this invention. 7 m + 7 b...Heat pipe, 9. Heat dissipation part, 1
0... Heat receiving part, 12a to 12g... Heat collecting pipe, 13
...Top header ~, 14...Bottom header, 15...Connection part, 16゜16'...Inner pipe 2

Claims (2)

[Claims] (1) The heat radiating part inserted into the heat storage tank water, the heat receiving part exposed to the sun, and the lower side of the heat radiating part and the heat receiving part are connected to each other, and the refrigerant liquefied in the heat radiating part is returned by gravity. and an outgoing path connected to the upper side of the heat receiving part and the upper part of the flowing liquid level of the liquefied refrigerant inside the heat radiating part to transmit the refrigerant vaporized in the heat receiving part to the heat radiating part. Solar water heater with heat pipes equipped with. (2) The heat dissipation part has a double pipe structure from the base end to the middle part, the return path is connected to the outer pipe, and the first outgoing path is connected to the inner pipe. (1
) Solar water heaters described in section 2.