JPH0123084Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a solar heat collection and storage device.

<Prior Art> FIG. 1 is a configuration diagram of a solar heat collection and storage device using a conventional closed indirect heating heat storage tank. In the figure, a heat collection circuit A is composed of a heat storage tank 1, a solar heat collector 2, an expansion tank 3, a heat collection pump 4, an outgoing pipe 5, a return pipe 6, a heat exchanger 7, a connecting pipe, etc. . The expansion tank 3 is filled with a subfreezing heat medium a (brobylene glycol), and this heat medium a
is supplied from the heat collection pump 4 to the solar heat collector 2 via the outgoing pipe 5. The heat medium a is heated by solar heat in the solar heat collector 2 and is supplied to the heat exchanger 7 from the return pipe 6. Further, a high temperature sensor 8 is provided on the solar heat collector 2 and a low temperature sensor 9 is provided on the heat storage tank 1, respectively, and output signals from both sensors 8 and 9 are provided to a control circuit 10. and control circuit 1
0, the solar heat collector 2 receives sunlight and the high temperature sensor 8 detects a temperature rise, while the low temperature sensor 9 detects a temperature rise.
detects the temperature of the heat storage medium b in the heat storage tank 1, and when the temperature difference between both sensors 8 and 9 exceeds a certain value, the heat collecting pump 4 is operated. By this,
The heat medium a is circulated and heated, and the collected heat is transferred to the heat exchanger 7.
Heat is exchanged with the heat storage heat medium b. Then, when the temperature difference becomes smaller, the control circuit 10 detects it and stops the heat collecting pump 4. Note that heat insulating materials 11 and 12 are wrapped around the outer peripheries of the heat storage tank 1 and the expansion tank 3 in order to reduce heat loss.

However, in this configuration, the expansion tank 3 is provided independently of the heat storage tank 1, and the energy held by the expansion tank 3 cannot be used effectively. Furthermore, heat insulating materials 11 and 12 are required for the heat storage tank 1 and the expansion tank 3, respectively, resulting in high costs.
Furthermore, the capacity of the expansion tank 3 is as follows:
A space B is required to ensure a minimum level at which air does not flow into the heat collector 2, and to accommodate the heat medium a held by the outgoing pipe 5 and return pipe 6. However, during normal operation, the space B is simply a dead space. It was all I could do.

<Purpose> In view of the above, the present invention aims to provide a solar heat collection and storage device that can effectively utilize energy and reduce costs by integrally providing an expansion tank on the outer periphery of a heat storage tank.

<Example> Hereinafter, an example of the present invention will be described based on FIG. 2. Note that the same functional parts as in FIG. 1 are indicated by the same numbers.

That is, the solar heat collection and storage device according to the present invention includes a solar heat collector 2 for collecting solar heat, a heat storage tank 1 filled with a heat storage medium b, and the heat storage tank 1.
a heat exchanger 7 installed therein, and an outgoing pipe 5 for heat medium circulation that connects the heat exchanger 7 and the heat collector 2 through piping.
and an incoming pipe 6, and an open expansion tank 13 for collecting heat medium provided in the outgoing pipe 5, and the expansion tank 13 has a cylindrical case 14 that is fitted and fixed to the heat storage tank 1, The outer peripheral wall 15 of the heat storage tank 1 and the outer peripheral part of both tanks 1 and 13 are covered with a heat insulating material 16.
It is coated with

The cylindrical case 14 has a top portion 14a and a bottom portion 17.
and a side plate part 18, an outlet 19 and an inlet 20 for the heat medium are formed at the lower part of the side plate part 18, and a top part 14.
A heat medium supply port 21 is formed in the side plate part 18.
An overflow pipe 22 is connected to the upper part of the pipe. The expansion tank 13 is attached to the outer peripheral wall 15 of the heat storage tank 1 at the top 14a of the cylindrical case 14.
and the inner peripheral edge of the bottom part 17 are welded to form the case 1.
4 and an outer peripheral wall 15, an annular interior 23 is formed. A heat exchanger 7 is disposed within the heat storage tank 1 below the expansion tank 13. In addition, the heat insulating material 16 includes the heat storage tank 1 and the expansion tank 13.
covers the entire outer surface of the

On the other hand, the hot water supply circuit C has a safety valve 26 and an air vent valve 27 connected to the hot water supply pipe 24 connected to the upper part of the heat storage tank 1.
and a hot water tap 25 are connected. Further, a water supply pipe 28 is connected to the lower part of the heat storage tank 1, and a pressure reducing check valve 29 and a relief valve 30 are connected to the pipe 28. When the hot water tap 25 is opened, the high temperature storage heat medium b is pushed out from the upper part of the heat storage tank 1 by water pressure and flows out from the hot water tap 25. Note that 31 is a drain valve at the bottom of the heat storage tank 1, and the other configurations are the same as the conventional example shown in FIG.

In the above configuration, the expansion tank 13 is formed by first processing stainless steel flat plates and wrapping them around the outer peripheral wall 15 of the stainless steel heat storage tank 1 at intervals, and then welding both ends of the flat plates to each other to form a cylindrical shape. ,
Then, the upper and lower ends are bent inward to form the top part 14a and the bottom part 17, and then the outer peripheral wall 1 of the heat storage tank 1 is bent.
5, the top 14a and bottom 17 of the cylindrical case 14;
Formed by welding the inner peripheral edge of the When formed in this manner, the inner wall of the expansion tank 13 does not need to be formed separately, and costs can be reduced. During heat collection operation, the heat medium a in the expansion tank 13 is transferred to the heat collection pump 4.
As a result, the heat collected by the solar heat collector 2 is circulated through the heat collection circuit A, exchanged with the heat storage medium b in the heat storage tank 1 from the heat exchanger 7, and returned to the expansion tank 13, repeating the cycle. At this time, since the heat medium a in the expansion tank 13 is used for heat collection operation, the heat medium a remaining in the expansion tank 13 is decreasing, and the upper part of the interior 23 of the expansion tank 13 becomes an air layer. ing. Since the inner wall of the expansion tank 13 utilizes the outer circumferential wall 15 of the heat storage tank 1, this air layer acts as an air insulation layer. The heat medium a remaining in the expansion tank 13 is a low-temperature heat medium that has already undergone heat exchange in the heat exchanger 7, but since it still has thermal energy, it is transferred into the heat storage tank 1 via the outer peripheral wall 15 of the heat storage tank 1. It is also possible to exchange heat with the heat storage heat medium b. In particular, the heat medium a that returns from the solar heat collector 2 to the expansion tank 13 when the heat collection operation is stopped has high thermal energy, and since the amount of heat medium is large, the heat exchange efficiency is high and the heat retention effect is also effective. are doing. Furthermore, the surface area of the heat insulating material 16 covering the outer circumferences of the heat storage tank 1 and the expansion tank 13 only needs to be slightly larger than the heat insulating material 11 conventionally used for the heat storage tank 1, making it possible to omit the heat insulating material unique to the expansion tank 13. , and the existence of the air insulation layer in the room 23 and the presence of the energy possessed by the heat medium a in the expansion tank 13, it is possible to reduce the thickness of the heat insulating material 16.

<Effects> As is clear from the above explanation, the present invention includes a solar heat collector for collecting solar heat, a heat storage tank filled with a heat storage medium, and a heat exchanger installed in the heat storage tank. , an outgoing pipe and a return pipe for heat medium circulation that connect the heat exchanger and the heat collector via piping, and an open expansion tank for collecting heat medium provided in the outgoing pipe, The expansion tank is composed of a cylindrical case that is fitted and fixed to the heat storage tank, and an outer circumferential wall of the heat storage tank, and the outer circumferences of both tanks are covered with a heat insulating material.

Therefore, according to the present invention, since the expansion tank is provided so as to share a part of the outer circumferential wall of the heat storage tank, the energy held by the expansion tank can be used effectively, and costs can be reduced by sharing the heat insulating material. Furthermore, the space inside the expansion tank during normal operation functions as an air insulation layer, making it possible to reduce the thickness of the heat insulating material.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional solar heat collection and storage device, Fig. 2 is a block diagram of a solar heat collection and storage device showing an embodiment of the present invention, and Fig. 3 is a cross section showing the molded state of the heat storage tank and expansion tank. It is a diagram. 1: Heat storage tank, 2: Solar heat collector, 5: Outgoing pipe, 6: Returning pipe, 7: Heat exchanger, 13: Expansion tank, 14: Cylindrical case, 15: Outer peripheral wall, 16: Heat insulating material, a : Heat medium.

Claims (1)

[Scope of utility model registration request] A solar heat collector for collecting solar heat, a heat storage tank filled with a heat storage medium, a heat exchanger installed in the heat storage tank, and a piping connection between the heat exchanger and the heat collector. The expansion tank is equipped with a cylindrical case externally fitted and fixed to the heat storage tank. and an outer circumferential wall of a heat storage tank, the outer circumferences of both tanks being covered with a heat insulating material.