JPH0240446Y2 - - 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 diagram showing the configuration of a solar heat collection and storage device using a conventional closed indirect heating heat storage tank.
In FIG. 1, the heat collection circuit includes an expansion tank 3, a heat collection pump 4, an outgoing pipe 5, a solar heat collector 2, a return pipe 6,
It is composed of a heat exchanger 7, connecting pipes, etc.
That is, the expansion tank 3 is filled with an antifreeze heat medium a (for example, a propylene glycol aqueous solution), and the heat medium a is supplied from the heat collection pump 4 to the solar heat collector 2 via the outgoing pipe 5. be done. The heat medium a is heated by solar heat in the solar heat collector 2, and then passed through the return pipe 6.
is supplied to the heat exchanger 7 via.

On the other hand, the heat storage and hot water supply circuit includes a heat storage tank 1, an air vent valve 21, a hot water supply pipe 20, a hot water tap 15, and the like. A working fluid b (water) is stored in the heat storage tank 1 and heated by the heat exchanger 7. Note that a water supply pipe 11 is connected to the bottom of the heat storage tank 1 via a pressure reducing check valve 12 and a relief valve 13, and water pressure is applied thereto. And hot water tap 15
When opened, the high temperature working fluid b from inside the heat storage tank 1 is pushed out from the upper part by water pressure and flows out from the hot water tap 15.

Note that heat insulating materials 16 and 1 are provided around the outer peripheries of the heat storage tank 1 and the expansion tank 3 in order to reduce heat loss.
7 is wrapped.

On the other hand, a high temperature sensor 8 is provided in the solar heat collector 2 , a low temperature sensor 9 is provided in the heat storage tank 1 , and the detection outputs of the high temperature sensor 8 and the low temperature sensor 9 are provided to a control circuit 10 . The control circuit 10 detects a temperature rise in the solar heat collector 2 when it receives sunlight, and the high temperature sensor 8 detects a temperature rise, while the low temperature sensor 9 detects the temperature of the fluid b in the heat storage tank 1. When the temperature difference 9 exceeds a certain value, the heat collecting pump 4 is operated. As a result, the heat medium a is circulated and heated, and the collected heat is transferred from the heat medium a to the working fluid b via the heat exchanger 7. Then, when the temperature difference becomes small, the heat collecting pump 4 is stopped.

However, in the above configuration, only one tank with a relatively large capacity (300 to 400 liters for general household use) was used as the heat storage tank 1. I can't get it.

(b) In winter when the water temperature is low, even though there is a lot of sunlight, hot water at the required temperature cannot be obtained.

This situation resulted in the problem of halving the utility value of the solar water heater.

<Purpose> The present invention eliminates the drawbacks of the conventional method, preferentially collects and stores the heat of the fluid used at a temperature higher than the required temperature, and heats it in a separately provided heat storage tank according to changes in heat collection conditions. The present invention aims to provide a solar heat collection and storage device that enables more effective use of hot water.

<Example> An example of the present invention will be described below with reference to FIGS. 2 and 3. 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 uses a high-temperature working fluid b heated by solar heat.
The main heat storage tank 1A that stores
A heat pipe 22 is provided for transferring heat between the main heat storage tank 1A and the auxiliary heat storage tank 1B. The fluid b is configured to heat the fluid b in the auxiliary heat storage tank 1B when the temperature b exceeds a predetermined temperature Tc.

The heat pipe 22 is a sealed container having an evaporating section 23 with fins 23a in the main heat storage tank 1A and a condensing section 24 with fins 24a in the auxiliary heat storage tank 1B, and is connected across the lower parts of both tanks 1A and 1B. The central exposed part 2 between both tanks 1A and 1B
2a is wrapped with a heat insulating material 16a. After the heat pipe 22 is evacuated,
It is filled with hydraulic fluid C. Then, in the evaporation section 23, the working fluid C absorbs heat from the high-temperature working fluid b on the outer periphery and evaporates, moves to the condensing section 24, heats the low-temperature working fluid b on the outer periphery, and condenses itself. It is configured to flow back to the evaporation section 23.

Generally, the amount of heat transferred by the heat pipe 22 increases exponentially with temperature as shown in Fig. 3 (Fig. 3). For example, by mixing nitrogen (for example, nitrogen, etc.), it is possible to provide a characteristic (as shown in FIG. 3) in which the amount of heat transfer rapidly increases after reaching a predetermined temperature Tc.

Therefore, if the heat pipe 22 with the latter characteristic is used, the temperature of the main heat storage tank 1A will be equal to the predetermined temperature Tc.
After reaching the temperature, the fluid b in the auxiliary heat storage tank 1B can be heated.

On the other hand, the heat collecting circuit A is similar to that shown in FIG. 1, and includes a solar heat collector 2 that collects solar heat, a heat medium a heated by the solar heat collector 2, and a working fluid b in the main heat storage tank 1A. Main heat storage tank 1 to exchange heat with
A heat exchanger 7 arranged at the bottom of A, and the heat exchanger 7
a return pipe 6 that connects the inlet side of the heat exchanger 7 with the outlet side of the solar heat collector 2; an expansion tank 3 connected to the outlet side of the heat exchanger 7 via a connecting pipe 5a; It is composed of an outgoing pipe 5 that connects the outlet side of the solar heat collector 2 with the inlet side of the solar heat collector 2, and a heat collection pump 4 provided in the outgoing pipe. The heat collection operation control device 10A includes a high temperature sensor 8 provided in the solar heat collector 2 and a main heat storage tank 1A.
Low temperature sensor 9 installed near the heat exchanger 7 inside
and a control circuit 10 that senses the temperature difference between the two sensors 8 and 9 and controls the start/stop of the heat collecting pump 4.

The hot water supply circuit also includes a hot water supply pipe 20 connected to the upper hot water outlet 25 of the main heat storage tank 1A, and a low temperature fluid hot water outlet pipe 27 connecting the hot water supply pipe 20 and the upper hot water outlet 26 of the auxiliary heat storage tank 1B. , a three-way switching valve 28 provided at the connection portion of the hot water supply pipe 20 with the hot water outlet pipe 27, and a hot water tap 15 provided at the outlet of the hot water supply pipe 20. The hot water supply control device 29 includes a first hot water temperature sensor 30 provided at the top of the main heat storage tank 1A, a second hot water temperature sensor 31 provided at the top of the auxiliary heat storage tank 1B, and a hot water temperature display and hot water supply system. It is comprised of an operation panel 32 for setting the temperature, and a control circuit 33 for controlling the mixing and switching of the three-way switching valve 28 based on temperature signals from the operation panel 32 and the first and second hot water temperature sensors 30 and 31. The water supply pipe 11 is also connected to the lower part of the auxiliary heat storage tank 1B. Note that the other configurations are the same as in FIG. 1.

Next, to explain the operation, in the heat collecting operation, when the difference in temperature between the high temperature sensor 8 of the solar heat collector 2 and the low temperature sensor 9 in the main heat storage tank 1A exceeds a certain value, the control circuit 10 turns on the heat collecting pump. The heat medium a heated by the heat collector 2 circulates through the heat collection circuit A, and the heat exchanger 7 in the main heat storage tank 1A heats the working fluid b in the main heat storage tank 1A. When the temperature difference between both sensors 8 and 9 becomes small, the heat collecting pump 4 is stopped and the heat collecting operation is completed.

At this time, during high solar radiation or when the water supply temperature is high in summer, the fluid b used in the main heat storage tank 1A may reach a predetermined temperature Tc or higher. In this case, in the evaporating section 23 of the heat pipe 22, the working fluid C is evaporated by absorbing heat from the working fluid B around its outer periphery, and moves to the condensing section 24. Then, the outer peripheral low-temperature working fluid b is heated in the condensing section 24, and is condensed and refluxed to the evaporating section 23. By repeating this process, the fluid b in the auxiliary heat storage tank 1B is also heated. Therefore, the main heat storage tank 1A can store the fluid b used for hot water supply in the bathtub, and the auxiliary heat storage tank 1B can store other fluids b used for cooking, for example.

On the other hand, the hot water supply operation is started by opening the hot water tap 15, and the water pressure is applied to the main heat storage tank 1A and the auxiliary heat storage tank 1B.
The used fluid b inside is pushed out from the upper hot water outlets 25 and 26, passes through the hot water supply piping 20, flows out from the hot water tap 15, and is utilized.

At this time, when the operation panel 32 is set to a desired temperature, the three-way switching valve 28 is switched or mixed to an appropriate valve opening degree based on the setting signal and the temperature signals from the hot water temperature sensors 30 and 31. open, the b-c ports are closed, and the working fluid b at the desired temperature flows out from the hot water tap 15.

<Effects> As is clear from the above explanation, the present invention has a main heat storage tank that stores high-temperature working fluid heated by solar heat, an auxiliary heat storage tank that stores low-temperature working fluid, and a main heat storage tank and auxiliary heat storage tank. A heat pipe is provided to transfer heat between the main heat storage tank and the main heat storage tank, so that the temperature required for the main heat storage tank can be collected and stored preferentially, increasing practical value. When this temperature is reached, the heat is collected and stored in the auxiliary heat storage tank using the heat pipe, which eliminates the imbalance between the heat collection area and heat storage capacity that occurs during periods of high solar radiation or when the amount of water supplied in the summer is high.
Effective heat storage becomes possible.

Furthermore, since heat transfer between both tanks is carried out by heat pipes, there is no need for moving parts or control circuits, making it possible to provide a highly reliable solar heat collection and storage device.

The heat pipe according to the present invention is interposed between the main heat storage tank and the auxiliary heat storage tank, and the heat pipe has the main heat storage tank side serving as an evaporation part and a liquid pool part formed as shown in the figure, and the auxiliary heat storage tank side forming a liquid pool part. It is formed as a condensation section. Therefore,
The main heat storage tank side is always at a high temperature, and even if the fluid used in the main heat storage tank is used to replenish new low-temperature fluid, the heat from the auxiliary heat storage tank will not transfer to the main heat storage tank, resulting in improved heat storage efficiency. It has an excellent effect of preventing the deterioration of

[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 showing an embodiment of the present invention, and FIG. 3 is a diagram illustrating the characteristics of a heat pipe. 1A...Main heat storage tank, 1B...Auxiliary heat storage tank, 22...Heat pipe, a...Heat medium, b...
Fluid used, 23... evaporation section, 24... condensation section.

Claims (1)

[Scope of utility model registration request] A main heat storage tank for storing a high-temperature working fluid heated by solar heat, an auxiliary heat storage tank for storing a low-temperature working fluid, and a heat pipe for transferring heat between the main heat storage tank and the auxiliary heat storage tank are provided. , the heat pipe has the property of rapidly increasing the amount of heat transferred after reaching a predetermined temperature, and has an evaporating section in the main heat storage tank and a condensing section in the auxiliary heat storage tank, and is connected between the lower parts of both tanks. A solar heat collection and storage device characterized in that the device is connected to the main heat storage tank and is configured to heat the fluid used in the auxiliary heat storage tank when the high temperature fluid used in the main heat storage tank exceeds the predetermined temperature.