JPS596368Y2 - Solar heat water heater - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a solar water heating system.

Conventionally, to heat water using solar heat, water is heated by circulating it between a solar heat collector and a heat storage tank, and then heated by a heating device such as a late-night electric heater installed inside the heat storage tank. At this time, water is circulated by supplying water from the bottom of the heat storage tank to the heat collector, and water heated by the heat collector is returned to the middle part of the heat storage tank below the heating device. Ta.

In the above heat storage tank, it is heated by a heating device late at night, so when the heat is collected by a collector, the water above the heating device in the heat storage tank is heated to a high temperature, but the temperature of the water below the heating device is low. .

Therefore, when the water heated in the heat collector returns to the heat storage tank, it floats upwards and creates convection between the hot water above the heating device and the low-temperature water just below it, causing heat to rise. There is a drawback that the boundary between the water and the low-temperature water is disturbed and the temperature of the lower part of the hot water decreases, that is, the amount of high-temperature hot water that can be used for hot water supply decreases.

The purpose of the present invention is to provide a solar water heating system that does not have the above-mentioned drawbacks and can efficiently collect heat.

In other words, the gist of the present invention is to provide a solar hot water supply system that collects heat by circulating water between a solar heat collector and a heat storage tank having a hot water supply pipe installed at the top and a heating device installed above the inside. A pipe a for sending water from the heat collector to the heat storage tank is connected to a lower part of the heat storage tank, and a pipe b for sending water from the heat storage tank to the heat collector is below the heating device of the heat storage tank. The solar heat water heater is characterized in that the water heater is connected above the pipe a.

Next, the solar water heating system of the present invention will be explained with reference to the drawings.

In Fig. 1, 1 is a solar heat collector, 2 is a heat storage tank with a hot water supply pipe 7 installed at the top and a heating device 6 installed above the inside, and a is a pipe going from the heat collector 1 to the heat storage tank 2. It is connected to the lower part of the heat storage tank 2.

Further, b is a pipe from the heat storage tank 2 to the heat collector 1, and is connected below the heating device 6 of the heat storage tank 2 and above the pipe a.

A pump 3 is installed near the heat storage tank 2 in the pipe b, and when the pump 3 is operated, water in the heat storage tank 2 passes through the pipe b and reaches the heat collector 1, where it receives solar heat. heated,
The water in the heat storage tank 2 returns to the heat storage tank 2 through the pipe a and is circulated and heated.

A temperature detector 41 is attached to the heat collector 1 to detect the temperature of the water inside it, and a temperature detector 42 is attached to the heat storage tank 2 to detect the temperature of the water below. When the detected temperature becomes higher than the temperature detected by the detector 42 by a certain temperature (for example, 5 to 10 degrees Celsius), the operation of the pump 3 is started by a signal from the controller 4, and the pump 3 is started to operate at a constant temperature (
For example, the operation of the pump 3 is stopped when the temperature drops below 2 to 3 degrees Celsius.

Although the shape of the water intake port 8 of pipe b is not particularly limited, the water intake port 8 is opened downward as shown in Fig. 2 so that the water in the heat storage tank is not disturbed when water is taken into pipe b. It is preferable that the water intake port 8 has a cross-sectional area larger than that of the pipe b as shown in FIG.

To explain how to operate the water heater described above, first, the heat storage tank 2 is constantly filled with water from the water supply pipe 5, and the temperature detected by the temperature sensor 41 due to sunlight is detected by the temperature sensor 42. The temperature difference is the temperature set in the controller 4 (usually a constant temperature in the range of 5 to 10°C).

), the pump 3 is activated by a signal from the controller 4.
operates, and the water in the heat storage tank 2 is passed through the pipe b to the heat collector 1.
The water is sent to the heat storage tank 2, heated, and circulated through the pipe a to the heat storage tank 2 to heat the water in the heat storage tank 2.

Also, in the evening, the sunlight becomes weaker, the sun becomes darker,
The temperature of the water in the heat storage tank 2 rises, the temperature difference becomes smaller, and the temperature is set in the controller 4 (usually a constant temperature in the range of 2 to 3 degrees Celsius).

), the pump 3 is stopped by a signal from the controller 4.

Furthermore, if the temperature of the water in the heat storage tank 2 decreases due to hot water supply, or if the temperature increases due to strong sunlight, the pump 3 is activated to circulate and heat the water.

The heated water as described above is supplied and used by the hot water supply pipe 7, but when the temperature of the water is low, it is heated by the heating device 6 and used.

It is preferable that the heating device 6 be heated inexpensively by late-night electricity.

A heating device is also provided at the lower part of the heat storage tank 2, and in rice fields where sunlight is weak, by heating the lower part of the heat storage tank 2, a predetermined amount of hot water can be obtained.

The configuration of the present invention is as described above, and water is taken from the intake port of pipe b, which is below the heating device of the heat storage tank and connected above pipe a, and heated by the heat collector, and the water is fed to the bottom of the heat storage tank. Even if the temperature of the water is higher than that of the surrounding water, it is mixed with the surrounding water, and by the time the temperature reaches around the intake date, it is evenly mixed with the surrounding water.

Therefore, almost no convection occurs between the hot water above the heating device and the water below, and the boundary layer between the hot water and water is not disturbed, allowing a predetermined amount of hot water to be supplied and collecting heat. It also enables efficient hot water supply.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view showing an example of the solar water heating system of the present invention, and FIGS. 2 and 3 are enlarged sectional views showing different examples of the water intake in section A of FIG. 1. 1... Solar heat collector, 2... Heat storage tank,
3...Pump, 4...Controller, 41.
42... Temperature detector, 5... Water supply pipe,
6...Heating device, 7...Hot water pipe, 8.
...Water intake, a, l) ...Piping.

Claims (2)

[Scope of utility model registration request] 1. In a solar heat water heater that collects heat by circulating water between a solar heat collector and a heat storage tank in which a hot water pipe is provided at the top and a heating device is provided above the inside,
A pipe a for sending water from the heat collector to the heat storage tank is connected to a lower part of the heat storage tank, and a pipe b for sending water from the heat storage tank to the heat collector is below the heating device of the heat storage tank. A water heater using solar heat, characterized in that the water heater is connected above the pipe a. 2. The solar water heating system according to claim 1, wherein the water intake port of pipe b opens downward in the heat storage tank.