JPH1089776A - Solar heat water supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar keat water supply for effectively utilizing warm water by using a water heater having an automatic hot water pouring function. SOLUTION: A hot water storage tank 1 having a heat exchanger 3 is provided in a body 4. The exchanger 3 is connected to a solar heat collector 2 via a circulation pie 5. The other end of a feed water pipe 7 connected to a feed water port 11 is divided in two directions, one of which is connected to the tank 1; and the other of which is connected to a constant temperature cold and hot water mixing valve 12. The valve 12 is connected to an auxiliary heat source 15 via an auxiliary hot water supply port 14 provided at the body. A hot water supply pipe 9 connected at its one end to the tank 1 and at the other end to a motor driven switching valve, 10 is provided. The pipe 9 is branched on its way, and connected to the valve 12 as an auxiliary hot water supply pipe 26. The source 15 is connected to the valve 10 via a return pipe 27. The valve 10 is connected to a high temperature hot water port 13 provided at the body 4. A controller 16 which receives information from a temperature detector 17 provided at the tank 1 to switch the valve 10 is installed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar water heater using solar heat.

[0002]

2. Description of the Related Art At present, when environmental protection is a major problem, the use of renewable energy has attracted people's attention. Among natural energies, those using solar heat have been used for a long time and are very well known as solar water heaters. Specifically, a device having a pipe that circulates a heat medium or cold water is installed outdoors to obtain hot water, and is used for washing surfaces, bath water, and the like.

Referring to FIG. 4, a solar heat collector 2
And the hot water storage tank 1 are communicated by a circulation pipe 5, and the heat medium is filled in the solar heat collector 2, the circulation pipe 5, and the heat exchanger 3 provided in the hot water storage tank 1 and circulated by a circulation pump 6. I have. The heat medium warmed by the solar heat collector 2 passes through the heat exchanger 3 so that the hot water storage tank 1
Warm the water stored inside. As a water supply path to the hot water storage tank 1, a water supply is directly connected to the water supply port 11 of the main body 4, and water is supplied into the hot water storage tank 1 through the water supply pipe 7. When using hot water, tap water is applied to the hot water storage tank 1 by the user opening the faucet, and the hot water flows out of the hot water supply port 21 through the hot water supply pipe 9 by the pressure. Generally, the auxiliary heat source unit 15 is often connected in consideration of not only the solar heat but also that hot water having a sufficient temperature cannot be obtained in winter or rainy weather.

As shown in FIG. 5, a connection with an auxiliary heat source unit 15 is made by branching a water supply pipe 20 downstream of a hot water supply port 21 by a switching three-way valve 22, and a flow path passing through the auxiliary heat source unit 15 and an auxiliary heat source unit. A hot water supply pipe is often provided by providing a bypass passage that does not pass through the auxiliary heat source unit 15 and joining the downstream side of the auxiliary heat source unit 15. At this time, the user operates the switching three-way valve 2 depending on the operating temperature.
2 is operated manually to obtain suitable temperature water. When the auxiliary heat source unit 15 is a fully automatic water heater, particularly a device that automatically pours water into a bathtub, when high-temperature hot water flows directly into the auxiliary heat source unit 15, the temperature becomes higher than the temperature set by the user. Since there is a possibility that hot water may be spread over the bathtub, a constant temperature hot water mixing valve 12 as shown in FIG.
It is necessary to mix the warm water inside and the cold water supplied from the water supply pipe 20 to lower the temperature, and then allow the water to enter the auxiliary heat source unit 15.

[0005]

However, in the conventional system as shown in FIG. 5, the water supply pipe 20 for entering the auxiliary heat source unit 15 is branched to provide a switching three-way valve 22 and a bypass passage. In addition, it is necessary for the user to manually switch the three-way switching valve 22 depending on the season and weather. When the auxiliary heat source unit 15 is a fully automatic water heater, the connection of the constant temperature hot water mixing valve 12 is essential as shown in FIG. In order to pass the hot water, it is necessary to temporarily reduce the temperature of the hot water in the hot water storage tank, and the hot water in the hot water storage tank 1 is not effectively used.

SUMMARY OF THE INVENTION In view of the above problems, the present invention reduces the labor and work of the user when the solar water heater and the auxiliary heat source unit 15 are used in combination, and connects piping to the solar water heater itself. It is an object of the present invention to provide a solar water heater that can be connected to any auxiliary heat source device 15 and that can effectively use hot water in a hot water storage tank.

[0007]

The present invention relates to a solar water heater comprising a solar heat collector 2, a main body 4, and an auxiliary heat source unit 15, as shown in FIGS. A hot water storage tank 1 having a heat exchanger 3 is provided inside the main body, and the heat exchanger 3 and the solar heat collector 2 are filled with a circulation pipe 5 filled with a heat medium.
The other end of the water supply pipe 7 whose one end is connected to the water supply port 11 provided in the main body is branched in two directions, one is connected to the hot water storage tank 1, and the other is connected to the constant temperature hot water mixing valve 12, The constant temperature hot water mixing valve 12 and the auxiliary heat source device 15
And a hot water supply pipe 9 having one end connected to the hot water storage tank 1 and the other end connected to the motor-operated switching valve 10. The hot water storage tank 1 is connected to the mixing valve 12, the auxiliary heat source unit 15 and the electric switching valve 10 are connected by a return pipe 27, and the electric switching valve 10 is connected to the high-temperature hot water supply port 13 provided in the main body 4. Temperature detector 17
And a controller 16 for receiving the information from the temperature detector 17 and switching the electric switching valve 10 is provided inside the main body 4.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, an auxiliary heat source for performing automatic pouring, since a constant temperature hot water mixing valve 12 is built in a main body 4 so that hot water in a hot water storage tank 1 can be lowered to a predetermined temperature or less. When the auxiliary heat source device 15 is not used, the hot water can be used as it is by using the electric switching valve 10. Further, since the electric switching valve 10 is automatically switched by the controller 16, there is no need to manually switch. still,
As the auxiliary heat source device 15, a device using oil, gas and electricity can be used.

As the heat medium used in the present invention, an antifreeze is used to prevent freezing damage in winter. Preferably, propylene glycol and ethylene glycol can be used.

As the constant temperature hot water mixing valve 12 used in the present invention, a mechanical mixing valve shown in FIG. 7 can be suitably used.
The mechanical mixing valve moves the return port 24 up and down by the expansion and contraction of a thermo-element filled with thermo wax as shown in the drawing, and when the temperature of the hot water side is high, as shown in FIG. 24, the inflow of water is increased, and conversely, when the temperature of the hot water side is low, the return port 24 is pushed down as shown in FIG.
This is to mechanically obtain hot and cold mixed water at a constant temperature. Naturally, an electric mixing valve having a built-in temperature detector 17 can be used as long as it discharges hot water having a predetermined temperature or lower.

The electric switching valve 10 used in the present invention is an electric motor valve. Referring to FIG. 6, a hot water in the hot water storage tank 1 is detected by a temperature detector 17 for detecting the temperature in the hot water supply tank 1. If the temperature is equal to or higher than the desired temperature, the valve 23 in the electric switching valve is opened to the solar hot water supply side as shown in FIG. 6 (a) so that hot water is supplied without passing through the auxiliary heat source unit 15, and if the desired temperature is not reached. For example, as shown in FIG. 6 (b), the hot water is discharged after opening to the auxiliary heat source device side and heating by the auxiliary heat source device 15.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view showing one embodiment of the present invention. In a hot water storage tank 1, a heat exchanger 3 provided on a circulation pipe 5 connected to a solar heat collector 2 is installed. The aqueous solution of propylene glycol filled in the circulation pipe 5 serves as a heat medium to heat the water in the hot water storage tank 1. In this embodiment, an auxiliary tank 19 is provided in the circulation pipe 5 to fill the heat medium.

Water is supplied to the hot water storage tank 1 from a water supply port 11 through a water supply pipe 7.
Done by The water supply pipe 7 is provided with a pipe for supplying water to the hot water storage tank 1 and an auxiliary heat source unit 15 on the way.
And a bypass pipe 8 for supplying water to the hot water supply pipe 9.
And an auxiliary hot water supply pipe 26 branched from the constant temperature hot water mixing valve 12. The hot water supply pipe 9 switches the passage by a motor-operated switching valve 10 downstream of the auxiliary hot water supply pipe 26. That is, the hot water in the hot water storage tank 1 is supplied from the high-temperature hot water supply port 13 without passing through the auxiliary heat source unit 15, the hot water in the hot water storage tank 1 is passed through the auxiliary hot water supply pipe 26, and the constant temperature hot water mixing valve 12 is used. After mixing with the cold water, heating is performed by the auxiliary heat source device 15, and the return pipe 27 is used to switch the route for returning the hot water to the electric switching valve 10.

Next, the flow of water will be described.
Is heated in the hot water storage tank 1, and when the temperature is equal to or higher than a desired temperature, the water passes through the hot water supply pipe 9 and the electric switching valve 10, exits the main body 4 through the high temperature hot water supply port 13, and is supplied with a hot water tap. More hot water. If the desired temperature is not reached in the hot water storage tank 1, the electric switching valve 10 is switched to close the passage from the hot water supply pipe 9 to the hot water tap 13, and the auxiliary heat source unit 15 is connected to the hot water supply pipe 9 via the auxiliary hot water supply pipe 26. After being heated to a desired temperature by the auxiliary heat source device 15, the water is returned to the electric switching valve 10 by the return pipe 27, and the hot water is supplied from the hot water tap.

The electric switching valve 10 is switched by transmitting information from a temperature detector 17 installed in the hot water storage tank 1 to a controller 16.
, And are switched according to a command from the controller 16. The switching temperature is determined by a user inputting a desired temperature to the controller 16 as appropriate. The constant-temperature hot-water mixing valve 12 is necessary for using a water heater having an automatic pouring device built in the auxiliary heat source device 15, and heats water in the hot water storage tank 1 to a temperature equal to or higher than the temperature set by the automatic pouring. In this case, the water is mixed with the cold water by the constant temperature hot water mixing valve 12 to make the temperature equal to or lower than the set temperature and flow into the auxiliary heat source unit 15.

FIG. 2 shows a configuration in which a remote controller 18 is installed in the solar water heater described with reference to FIG. The remote controller 18 shown in FIG. 3 displays the temperature of the hot water in the hot water storage tank 1 so that the user can remotely switch the electric switching valve 10. When automatic switching is selected by the remote controller 18,
The electric switching valve 10 is automatically switched at a temperature set by the user in advance, so that the user does not need to switch every time the electric switch is used.

[0017]

According to the present invention, with the above-described configuration, the temperature of hot water in the hot water storage tank 1 can be controlled.
It is possible to freely switch between solar hot water supply and hot water supply using an auxiliary heat source unit, it is possible to install a fully automatic pouring water heater, and it is also possible to obtain high-temperature hot water through a route that does not pass through the hot water heater . In addition, the electric switching valve 10 and the constant temperature hot water mixing valve 1
2 is built in the main body in advance, so that the installation is easy, and the operation can be reduced. Further, the controller 1
6, the electric switching valve 10 can be automatically switched, so that the work load on the user can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a solar water heater showing one embodiment of the present invention.

FIG. 2 is a schematic diagram of a configuration of a solar water heater showing another embodiment of the present invention.

FIG. 3 is an external view of a remote controller used for the solar water heater of the present invention.

FIG. 4 is a schematic diagram showing a configuration of a conventional solar water heater.

FIG. 5 is a schematic view showing the configuration of another conventional solar water heater.

FIG. 6 is a sectional view of an electric switching valve used in the present invention;
(A) shows the case where the temperature in the hot water storage tank is higher than the desired temperature, and (b) shows the case where the temperature has not reached the desired temperature.

FIGS. 7A and 7B are cross-sectional views of a constant-temperature hot-water mixing valve used in the present invention, where FIG. 7A shows a case where the hot-water temperature is high, and FIG. 7B shows a case where the hot-water temperature is low.

[Explanation of symbols]

1. Hot water storage tank 2. Solar heat collector 3. Heat exchanger
4. Main body 5. Circulation pipe 6. Circulation pump 7. 7. Water supply pipe Bypass pipe 9. Hot water supply pipe 10. Electric switching valve 11. Water inlet
12. Constant temperature hot water mixing valve 13. Hot water inlet 14. Auxiliary hot water outlet 15. Auxiliary heat source unit 16. Controller 1
7. Temperature detector 18. Remote control 19. Auxiliary tank 20. Water supply piping
21. Hot water supply port 22. Switching three-way valve 23 valve 24. Return port 25. Main hot water supply pipe 26. Auxiliary hot water supply pipe 27. Return pipe

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Isamu Takita 1250 Shimoedori, Shimodate-shi, Ibaraki Pref.

Claims (2)

[Claims] 1. A solar water heater comprising a solar heat collector, a main body, and an auxiliary heat source, wherein a hot water storage tank having a heat exchanger is provided inside the main body, and the heat exchanger and the solar heat collector are provided. Vessel is connected by a circulation pipe filled with a heat medium, and one end of the water supply pipe connected to a water supply port provided in the main body is connected to the other end by 2
Branch, one side is connected to a hot water storage tank, the other is connected to a constant temperature hot water mixing valve, the constant temperature hot water mixing valve is connected to an auxiliary heat source through an auxiliary hot water supply port provided in the main body, and one end is connected to the hot water storage tank. Provide a hot water supply pipe with the other end connected to the electric switching valve,
The hot water supply pipe is branched in the middle and connected to the constant temperature hot water mixing valve as an auxiliary hot water supply pipe, the auxiliary heat source and the electric switching valve are connected by a return pipe, and the electric switching valve and the hot water supply port provided in the main body are connected. A solar water heater, wherein a temperature detector is provided in the hot water storage tank, and a controller that receives information from the temperature detector and switches the electric switching valve is installed inside the main body. 2. The solar water heater according to claim 1, wherein the controller can be controlled by a wireless or wired remote controller.