JPH109682A - Solar water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar hot water supply system capable of suppressing a decrease in a hot water supply amount when removing hot water through a fully automatic boiler, while maintaining the advantages of a conventional solar hot water supply system. With the goal. SOLUTION: At a position higher than a first communication pipe 16,
Further, a second communication pipe 30 that connects the water supply pipe 11 and the hot water supply pipe 12 is provided at a position lower than the solar water heater 10. A second mixing valve 19 is provided in the middle of the second distribution pipe 29. The water port 19 a of the second mixing valve 19 is connected to the water supply pipe 11 at a position lower than the second communication pipe 30. A third communication pipe 31 that communicates is provided. Second distribution pipe 29 and fully automatic boiler 13
The temperature switching 3 is connected to the connecting portion of the first distribution pipe 28 on the secondary side of
A three-way valve 27 is provided.
, And is automatically controlled by the first temperature sensor 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar hot water supply system for supplying hot water using solar heat.

[0002]

2. Description of the Related Art Conventionally, various solar hot water supply systems have been developed, and the present applicant has proposed a solar hot water supply system as shown in FIG. 2 in Japanese Patent Application No. 7-349321.

The solar hot water supply system includes a solar water heater 10 for heating water using solar heat, a water supply pipe 11 connected to a water supply port 10a of the solar water heater 10, and supplying water to the solar water heater 10; A solar hot water supply system comprising a hot water supply pipe 12 connected to a hot water outlet 10b of the water heater 10 to take out hot water from the solar water heater 10, and a fully automatic boiler 13 attached near an outlet of the hot water supply pipe 12, A pressure reducing valve 14 is provided in the water supply pipe 10 at a position lower than the solar water heater 10, and the water supply pipe 11 on the primary side of the pressure reducing valve 14 is provided.
Is connected to a water supply main plug 15, a first communication pipe 16 is provided on the secondary side of the pressure reducing valve 14 and at a position lower than the solar water heater 10 to connect the water supply pipe 11 and the hot water supply pipe 12, and a first communication pipe 16 is provided.
A first mixing valve 17 is provided at a connecting portion between the communication pipe 16 and the hot water supply pipe 12, the first communication pipe 16 is connected to a water port 17 a of the first mixing valve 17, and the mixed water of the first mixing valve 17 is provided. The hot water supply pipe 12 on the primary side of the fully automatic boiler 13 is connected to the outlet 17b, and is connected to the water supply pipe 11 at a position closer to the solar water heater 10 than the first communication pipe 16 and at a position lower than the solar water heater 10. Second to connect the hot water supply pipe 12
Is provided, a second mixing valve 19 is provided at a connection portion between the second communication pipe 18 and the hot water supply pipe 12, and the second communication pipe 18 is connected to a water port 19a of the second mixing valve 19, The hot water supply pipe 12 of the solar water heater 10 is connected to the gate 19b of the second mixing valve 19, and the mixed water outlet 19c of the second mixing valve 19 and the gate 17c of the first mixing valve 17 are connected. A third communication pipe 20 for connecting the water supply pipe 11 and the hot water supply pipe 12 at a position closer to the solar water heater 10 than the communication pipe 18 and lower than the solar water heater 10 is provided. Pump 2
1, a first hot-pressure valve 22 and a heater 23 are provided, and a second hot-pressure valve 24 and a hot water temperature of the solar water heater 10 are detected near the outlet of the solar water heater 10 to control the operation of the pump 21. The first temperature sensor 25 is provided, and the hot water supply pipe 12 between the first mixing valve 17 and the second mixing valve 19 is provided.
To the hot water supply pipe 12 on the secondary side of the fully automatic boiler 13 is connected to the hot water supply pipe 12 on the secondary side of the fully automatic boiler 13 and the bypass pipe 26 by a first temperature sensor 25. A temperature switching three-way valve 27 to be controlled is provided.

[0004] This solar hot water supply equipment can use hot water without reheating by a fully automatic boiler when high-temperature hot water is obtained by a solar water heater, and furthermore, an automatic hot water filling function of a fully automatic boiler and a hot water supply function. Can be used, and even if the pressure of the solar water heater is set to 1 kg / cm ² or more, the hot water temperature in the solar water heater does not exceed 100 ° C. Have.

[0005]

However, in the above-mentioned solar hot water supply system, since the first mixing valve and the second mixing valve are attached to the hot water supply pipe in series, the hot water is taken out through a fully automatic boiler. There is a drawback that the resistance sometimes increases and the amount of hot water taken out decreases.

[0006] The present invention has been made in view of the above circumstances, and while maintaining the advantages of the conventional solar water heater,
It is an object of the present invention to provide a solar hot water supply system capable of suppressing a decrease in a hot water supply amount when removing hot water through a fully automatic boiler.

[0007]

SUMMARY OF THE INVENTION A solar water heater according to the present invention includes a solar water heater for heating water using solar heat, and a water supply pipe connected to a water inlet of the solar water heater to supply water to the solar water heater. A hot water supply pipe connected to the outlet of the solar water heater to take out hot water from the solar water heater; a first distribution pipe and a second distribution pipe branched from the hot water supply pipe; and a middle of the first distribution pipe. A solar water heater provided with a fully automatic boiler provided in a water supply pipe at a position lower than the solar water heater, a pressure reducing valve on the secondary side of the pressure reducing valve, and from the solar water heater A first communication pipe for communicating the water supply pipe with the first distribution pipe is provided at a lower position, and a first mixing valve is provided at a connection between the first communication pipe and the first distribution pipe; Connect the first communication pipe to the water port of the mixing valve,
Of the fully automatic boiler at the mixing water outlet of the mixing valve
A second communication pipe for connecting the first distribution pipe on the next side and connecting the water supply pipe and the hot water supply pipe at a position higher than the first communication pipe and at a position lower than the solar water heater is provided. A pump, a first temperature and pressure valve, and a heater are provided in the second communication pipe, a second mixing valve is provided in the middle of the second distribution pipe, and a water port of the second mixing valve is provided from the second communication pipe. Also connects the third communication pipe communicating with the water supply pipe at a lower position, controls the operation of the pump by detecting the second hot-pressure valve near the outlet of the solar water heater and the hot water temperature of the solar water heater. A first temperature sensor is provided, a second temperature sensor for detecting an outside air temperature is provided near a solar water heater, a third temperature sensor for detecting a water temperature is provided in a water supply pipe, and a secondary side of a fully automatic boiler is provided. Controlled by a first temperature sensor at the connection between the first distribution pipe and the second distribution pipe Be provided temperature switching three-way valve which,
Setting the pressure of the pressure reducing valve lower than the pressures of the first and second hot-pressure valves and the pressure of the first hot-pressure valve lower than the pressure of the second hot-pressure valve; The temperature of the first temperature sensor is lower than the set temperatures of the first and second hot-pressure valves, and
The setting temperature of the temperature / pressure valve is set lower than the setting temperature of the second temperature / pressure valve, and the operation of the pump and the heater is controlled by the second temperature sensor and the third temperature sensor.

According to the present invention, a first check valve for allowing a flow from a hot water supply pipe to a water supply pipe and preventing a flow in a reverse direction is provided in the second communication pipe. The water supply pipe is provided with a second check valve that allows a flow from the water supply tap to the pressure reducing valve and prevents a flow in the reverse direction, and a connection between the first communication pipe and the third communication pipe and the solar heat pipe. A third check valve that allows a flow from the pressure reducing valve to the solar water heater and prevents a flow in the reverse direction is provided in a water supply pipe between the water heaters, and a third check valve is provided from a connection portion with the second communication pipe. A fourth check valve is provided in the hot water supply pipes of the first and second distribution pipes to allow a flow in a direction in which the hot water enters the first and second distribution pipes and to prevent a flow in the opposite direction. In addition, a fifth check valve is provided on the secondary side of the three-way temperature switching valve to allow the flow of hot water from the three-way temperature switching valve and to prevent the flow in the opposite direction. To.

Further, according to the present invention, a first flow rate switch is provided on the second communication pipe, and the second flow rate is supplied to the hot water supply pipe on the first and second distribution pipe side from the connection with the second communication pipe. A switch is provided.

The present invention is characterized in that a fourth temperature sensor is attached near the heater.

Further, according to the present invention, a first pressure relief valve is provided in a water supply pipe closer to a water supply tap than a pressure reducing valve, and a second pressure relief valve is provided in a hot water supply pipe on a secondary side of a fourth check valve. It is characterized by being provided.

[0012]

In the solar hot water supply system of the present invention, when hot water is obtained by the solar water heater, hot water at a set temperature (for example, about 60 ° C.) passes through the second mixing valve and is supplied to the second mixing valve. Get out of the mixed water outlet. That is, the hot water of the solar water heater can be directly used in a kitchen or a bath without passing through a fully automatic boiler.

[0013] If the set temperature of the temperature switching three-way valve is lower than the hot water temperature measured by the first temperature sensor provided in the solar water heater, hot water flows to the second distribution pipe side, and the fully automatic boiler The hot water of the solar water heater can be used directly in the kitchen or bath without passing through.

[0014] Even in such a state, if a bath dedicated to the bath is connected to the fully automatic boiler, if the bath uses an automatic hot water filling function or a sashimi hot water function, the hot water in the hot water supply pipe is supplied to the first distribution pipe. After passing through the first mixing valve, the hot water is heated to the set temperature (for example, about 35 ° C.), then the mixed water exits from the first mixing valve, and is refired by a fully automatic boiler. Hot water at a temperature (for example, about 42 ° C.) is supplied to the bath through a dedicated bath pipe.

On the other hand, if the amount of solar radiation is small on a rainy day or a snowy day, and the set temperature of the temperature switching three-way valve is higher than the hot water temperature measured by the first temperature sensor, the hot water that has passed through the hot water supply pipe will It is reheated by a fully automatic boiler through one distribution pipe, and can be used as hot water of a predetermined temperature. It is also possible to use an automatic hot water filling function or a hot water function in a bath.

As described above, according to the present invention, when hot water is taken out through the fully automatic boiler, only the first mixing valve provided in the first distribution pipe passes, so that the resistance is small and the amount of hot water supply is greatly reduced. Can be prevented.

The first mixing valve of the present invention is used to make full use of the function of a fully automatic boiler, and its set temperature is suitably from 25 to 38 ° C. That is, when the set temperature exceeds 38 ° C., the reheating temperature of the fully automatic boiler increases, and the general bathing temperature of about 42 ° C.
Temperature control at about ℃ becomes impossible, while 2
Below 5 ° C, the fuel efficiency of the fully automatic boiler increases,
It is not preferable because economic efficiency is deteriorated. The second mixing valve is used for safety measures such as burn prevention when using hot water from a solar water heater directly without passing through a fully automatic boiler. I have.

In the solar hot water supply system of the present invention,
Even if the solar water heater is used at a pressure of 1 kg / cm ² or more, the hot water in the solar water heater rises when the hot water in the solar water heater rises without using hot water at least for two days on a sunny day in summer. When the temperature reaches the activation temperature, the first temperature sensor detects and the pump operates, and the hot water in the solar water heater is cooled while circulating from the hot water supply pipe through the second communication pipe to the water supply pipe. .

However, under the installation conditions of the solar water heater, for example, when the length of the water supply pipe or the hot water supply pipe is short, or when the water supply pipe / the hot water supply pipe is wrapped with a thick heat insulating material and the cooling capacity is small, the hot water supply is difficult. The temperature of the hot water in the solar water heater may gradually rise even if the water circulates, but when the hot water temperature reaches the set temperature of the first hot-pressure valve, hot water is discharged from the first hot-pressure valve,
The same amount of water as that discharged is newly supplied from the pressure reducing valve to the solar water heater through the water supply pipe, and is mixed with the hot water to lower the hot water temperature. The first hot-pressure valve is installed at a position lower than the solar water heater, and normally, a drain pipe is connected to the first hot-pressure valve so that hot water can be safely discharged near the ground.

If the circulation function does not work due to a power failure or a pump failure, the temperature of the hot water in the solar water heater rises to the set temperature of the second pressure valve provided at the outlet of the solar water heater. However, also at this time, hot water is discharged from the second hot-pressure valve, and the same amount of water is newly supplied from the pressure reducing valve to the solar water heater through the water supply pipe, and mixed with the hot water. It will lower the temperature. That is, in the solar hot water supply equipment of the present invention, the first hot-pressure valve is normally operated to maintain the hot water temperature at or below the set temperature, but the second hot-pressure valve is provided in consideration of safety in case of emergency. Have been.

When the outside air temperature is low in winter, the operation of the pump and the heater is controlled by the second temperature sensor and the third temperature sensor, and the hot water heated by the heater is circulated, so that the inside of the water supply pipe or the hot water supply pipe is controlled. Water can be prevented from freezing. When the pump is activated, the hot water circulation path is solar water heater → hot water supply pipe → second connecting pipe → water supply pipe → solar water heater. The hot water heated by the heater first flows into the water supply pipe, The effect is immediate.

The hot water heated by the solar water heater flows into the hot water supply pipe. However, if all the water in the solar water heater is used up, the water will flow into the hot water pipe because the solar water heater is filled with water, but this water does not freeze immediately, Hot water heated by the heater before freezing reaches the hot water supply pipe through the solar water heater.

In the solar hot water supply system of the present invention, the second communication pipe is provided with a first check valve which allows a flow from the hot water supply pipe to the water supply pipe and prevents the flow in the reverse direction. A second non-return valve is provided in the water supply pipe on the next side to allow a flow from the water supply tap to the pressure reducing valve and prevent a flow in the reverse direction, and a connecting portion with the third communication pipe and a solar water heater are provided. A third check valve for allowing flow from the pressure reducing valve to the solar water heater and preventing flow in the reverse direction is provided in the water supply pipe between the first and second water supply pipes. In the hot water supply pipe of the second distribution pipe, a fourth check valve for allowing the flow of hot water into the first and second distribution pipes and preventing the flow in the opposite direction is provided, and the temperature switching 3 A fifth check valve is provided in the first distribution pipe on the secondary side of the one-way valve to allow hot water to flow out of the three-way temperature switching valve and to prevent flow in the opposite direction. When unforeseen circumstances, such as when the water outage occurs, it is possible to prevent backflow into the water supply main valve side of the water supply.

The temperature switching three-way valve uses the hot water in the solar water heater directly when the hot water temperature in the solar water heater is high, and reheats it with a fully automatic boiler when the hot water temperature is low. It is for using hot water and is automatically controlled by a first temperature sensor attached to the solar water heater. That is, the temperature measured by the first temperature sensor is
When the temperature is higher than the set temperature of the temperature switching three-way valve, the flow is switched so that the flow on the first distribution pipe side enters.
The temperature measured by the temperature sensor of
When the temperature is lower than the set temperature of the direction valve, the flow is switched so that the flow on the fully automatic boiler side is entered.

It is preferable that a remote controller be attached to the temperature switching three-way valve so that the temperature can be remotely controlled, so that a person using hot water can arbitrarily set the temperature from the room. The first temperature sensor may be installed at any location where the temperature of the hot water in the solar water heater can be accurately measured. For example, the first temperature sensor may be inserted into the outlet of the solar water heater or a band may be placed outside the hot water side header pipe. And wrap it around.

It is preferable to provide a strainer in the water supply pipe on the primary side of the pressure reducing valve, because foreign substances such as dust in tap water can be removed and a foreign substance biting accident such as a pump or a hot pressure valve can be prevented.

Incidentally, the first and second hot-pressure valves of the solar hot water supply system of the present invention act as safety valves for temperature and pressure, and it is possible to use both a temperature control valve and a pressure relief valve.

In the solar hot water supply system of the present invention,
If the set temperature of the first temperature sensor for starting the pump is too low, the amount of heat obtained by the solar water heater will be wasted, and if the set temperature of the first temperature sensor is too high, In order to eliminate the difference from the set temperature of the first hot-pressure valve, the temperature is desirably 70 ° C. or more and 90 ° C. or less.

Further, in the solar hot water supply system of the present invention, if a plurality of second hot-pressure valves are installed, even if one hot-pressure valve fails, the other hot-press valves operate normally, so that safety is increased. Become.

The main cause of freezing of the water in the water supply pipe or hot water supply pipe is that the outside air temperature is low. Therefore, it is preferable to start the pump and the heater by a second temperature sensor that detects the outside air temperature. . The second that is an outside air temperature sensor
The temperature sensor is mounted near the solar water heater which is easily affected by wind and the like.

Further, when hot water remains in the solar water heater, the hot water flows through the water supply pipe or the hot water supply pipe, and does not freeze even if the outside air temperature is 0 ° C. or less. The stop of the heater is preferably performed by a third temperature sensor that detects the water temperature. The mounting position of the third temperature sensor, which is a water temperature sensor, needs to be in the water supply pipe because hot water flows in the hot water supply pipe when hot water is used in a bath or a kitchen.

Further, in the present invention, the first communication pipe is provided with the first communication pipe.
When the water does not circulate during the operation of the pump, the pump can be stopped. That is, if the solar hot water supply equipment is used for a long period of time, the pump may bite dust or the inside of the water supply pipe, the hot water supply pipe and the second communication pipe may be blocked by rust, dust, or the like. If the pump continues to operate as described above, there is a risk of failure. However, by operating the first flow rate switch, it is possible to prevent the failure of the pump and detect that there is an abnormality in circulation.

Further, when a second flow rate switch is provided in the hot water supply pipes on the first and second distribution pipe sides from the connection portion with the second communication pipe, the pump is used when hot water is used in a bath or a kitchen. Can be stopped. That is, when hot water is used in a bath or a kitchen, new water flows into the solar water heater, and the water in the solar water heater does not rise until it reaches 100 ° C or higher, so there is no need to operate the pump. Because. In addition, circulating water with a pump is not preferable because hot water is divided into two parts, the first mixing valve side and the pump side, and the amount of hot water supplied to a bath or kitchen may be reduced.

It is preferable to attach a fourth temperature sensor in the vicinity of the heater, because when the temperature of the heater becomes abnormally high, a failure can be detected and the energization can be stopped. Further, when the first pressure relief valve is provided in the water supply pipe on the side of the water supply tap than the pressure reducing valve, even if the water supply pipe freezes in winter, the internal pressure is released from the first pressure relief valve, so that the water supply pipe is Explosion can be prevented. Also, if a second pressure relief valve is provided in the hot water supply pipe on the secondary side of the fourth check valve, the second pressure relief valve is provided even if the first distribution pipe or the second distribution pipe is frozen. Since the internal pressure is released from the pipe, the rupture of the pipe can be prevented.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a solar hot water supply system of the present invention will be described in detail based on embodiments.

(Embodiment 1) FIG. 1 is a system diagram showing a solar hot water supply system of the present invention. The same components as those of the solar hot water supply system in FIG. 2 are given the same numbers.

As the solar water heater 10, for example, a selective absorption film is formed on the outer surface of a transparent long cylindrical glass container whose inside is kept in a vacuum as disclosed in Japanese Patent Publication No. 3-56387. A plurality of heat collecting hot water storage tubes in which cylindrical metal hot water storage containers formed with a coating are arranged coaxially can be used, the hot water storage amount is 240 liters, and the effective heat collecting area is 2.73 m ² .

The solar water heater 10 is installed on the roof of a building at a predetermined inclination angle, one end of a water supply pipe 11 is connected to a water supply port 10a of the solar water heater 10, and one end of a hot water supply pipe 12 is connected to a solar water heater. It is connected to tap hole 10b of vessel 10. A pressure reducing valve 14 is attached to the water supply pipe 11 at a position lower than the solar water heater 10 (near the ground), and a primary side of the pressure reducing valve 14 is connected to a water supply main plug 15.
The other end of the hot water supply pipe 12 is connected to a first distribution pipe 28 and a second distribution pipe 29.

In the immediate vicinity of the secondary side of the pressure reducing valve 14, the first communication pipe 1 for connecting the water supply pipe 11 and the first distribution pipe 28 is connected.
The first communication pipe 16 and the first distribution pipe 2 are provided.
8 is provided with a first mixing valve 17.

At a position higher than the first communication pipe 16 and lower than the solar water heater 10, the water supply pipe 1
A second communication pipe 30 is provided for connecting the hot water supply pipe 1 to the first communication pipe 1.

A second mixing valve 19 is provided in the middle of the second distribution pipe 29, and a water port 19 a of the second mixing valve 19 is supplied with water at a position lower than the second communication pipe 30. A third communication pipe 31 that communicates with the pipe 11 is provided. Second distribution pipe 29 and fully automatic boiler 13
The temperature switching 3 is connected to the connecting portion of the first distribution pipe 28 on the secondary side of
A three-way valve 27 is provided.
, And is automatically controlled by the first temperature sensor 25.

The pump 21 and the first communication pipe 30 are connected to the second communication pipe 30.
Temperature pressure valve 22, heater 23 and first flow switch 32
And a first check valve 33 are provided. Further, a drain pipe (not shown) is connected to the first hot-pressure valve 22,
Hot water can be discharged near the ground.

A second hot-pressure valve 24 is provided near the outlet 10 b of the solar water heater 10, and a first temperature sensor 25 for detecting the temperature of the hot water in the solar water heater 10 and controlling the operation of the pump 21. Are inserted into the tap hole 10b. Second
A drain pipe (not shown) is also connected to the hot-pressure valve 24 so that hot water flows along the roof.

A second temperature sensor 34 is provided near the solar water heater 10 and a third temperature sensor 35 is provided in the water supply pipe 11. The operation of the heater 21 and the heater 23 is controlled.

The set temperature of the second mixing valve 19 is set to 60 ° C., and when the temperature of hot water flowing from the solar water heater 10 is 60 ° C. or higher, water is mixed from the third communication pipe 31 to about 60 ° C. After flowing into the mixed water of ° C, it flows to the temperature switching three-way valve 27, and when the temperature of the hot water flowing from the solar water heater 10 is lower than 60 ° C, it flows to the temperature switching three-way valve 27 as it is.

The set temperature of the first mixing valve 17 is set to 35 ° C., and when the temperature of hot water flowing from the solar water heater 10 is 35 ° C. or more, water is mixed from the first communication pipe 16 to about 35 ° C. After being made into the mixed water of ° C., it flows to the fully automatic boiler 13, and when the temperature of the hot water flowing from the solar water heater 10 is lower than 35 ° C., it flows to the fully automatic boiler 13 as it is.

A second check valve 36 is provided in the water supply pipe 11 on the primary side of the pressure reducing valve 14, and the first communication pipe 16 and the third
A third check valve 37 is provided in the water supply pipe 11 between the connection part with the communication pipe 31 and the solar water heater 10, and the first and second check valves are provided from the connection part with the second communication pipe 30. Distribution pipes 28, 29
A fourth check valve 38 is provided in the hot water supply pipe 12 on the side. A fifth check valve 39 is provided in the first distribution pipe 28 on the secondary side of the temperature switching three-way valve 27.

A fourth temperature sensor 40 is mounted on the surface of the heater 23. Even if the heater 23 fails and becomes abnormally high, the fourth temperature sensor 40 detects the abnormal temperature and stops the energization. it can.

A manual three-way valve 41 is connected to the first distribution pipe 28 between the first mixing valve 17 and the fully automatic boiler 13.
The water port 41a of the manual three-way valve 41 is provided.
A bypass pipe 42 communicating with the water supply pipe 11 at a position lower than the pressure reducing valve 14 is connected to the water supply pipe 11 between the connection portion with the bypass pipe 42 and the pressure reducing valve 14. A switching valve 43 is provided. Thus, when the solar water heater 10 is repaired or replaced, the manual three-way valve 41 is switched to the bypass pipe 42 side and the water supply / water shutoff switching valve 43 is closed, so that water flows to the solar water heater 10 side. The hot water can be heated and supplied by the fully automatic boiler 13 in a state where it is not provided.

A first pressure relief valve 44 is provided in the water supply pipe 11 closer to the water supply tap 15 than the pressure reducing valve 14, and a second pressure relief valve 44 is provided in the hot water supply pipe 12 on the secondary side of the fourth check valve 38. Is provided. In addition, the fourth check valve 38 and the second check valve 38
A second pressure relief valve 46 is provided in the hot water supply pipe 12 between the hot water supply pipe 45 and the flow switch 45, so that even if the pipe freezes in winter, the internal pressure is released and the burst can be prevented.

The total length of the water supply pipe 11 and the hot water supply pipe 12 and the first distribution pipe 28 of this solar hot water supply facility is about 1 each.
0 m, and piped with a cross-linked polyethylene pipe without heat insulation. Further, a bath dedicated to the bath (not shown) connected to the bath is connected to the fully automatic boiler 13, and when the hot water filling function or the hot water function of the fully automatic boiler 13 is used, the inside of the solar water heater 10 is removed. Hot water is first from hot water supply pipe 12
After entering the first mixing valve 17 through the distribution pipe 28, the hot water is set at the set temperature, and then flows from the mixed water outlet 17a into the fully automatic boiler 13 via the first distribution pipe 28, and is reheated. From the hot water at a predetermined temperature and supplied to the bath.

Next, an example of use of the solar hot water supply equipment will be described.

First, the set pressure of the pressure reducing valve 14 is set to 2.5 kg /
cm ² , the set pressure of the first hot-pressure valve 22 is 3.0 kg / c.
m ² , the set pressure of the second hot-pressure valve 24 is 3.5 kg / cm
^{And 2} . Further, the pump 21 is started at 80 ° C. and the set temperature of the first temperature sensor 25 for controlling the pump 21 is increased.
The pump 21 is stopped at 5 ° C., and the pump 21 is started at a set temperature of the second temperature sensor 34 lower than 4 ° C.
The pump 21 and the heater 23 are stopped at 4 ° C. or higher, and the heater 23 is started at a temperature set at the third temperature sensor 35 lower than 4 ° C. The heater 23 used was 100 V, 400 W. Further, the set temperature of the first hot-pressure valve 22 is 90 ° C., and the second hot-pressure valve 2
The set temperature of No. 4 was 95 ° C.

In this way, on the morning of a sunny day in summer, tap water of about 30 ° C. is supplied from the pressure reducing valve 14 to the solar water heater 10 through the water supply pipe 11 and left without using any hot water. The temperature of the hot water in the vessel 10 became 80 ° C., the first temperature sensor 25 detected 80 ° C., and the pump 21 was operated.

The hot water circulation path when the pump 21 operates is as follows: the pump 21 → the second communication pipe 30 → the water supply pipe 11 → the solar water heater 10 → the hot water supply pipe 12 → the second communication pipe 30 → the pump 21. The circulation flow rate was about 7 liters / minute. Then, in the evening, the temperature of the hot water in the solar water heater 10 drops,
Then, the first temperature sensor 25 detects 75 ° C. again, and the pump 21 stops.

The set temperature of the temperature switching three-way valve 27 is set to 4
In the evening, when the faucet of the kitchen was opened to supply hot water in the solar water heater 10 to the kitchen (not shown) in the evening, the hot water supply pipe 12 from the solar water heater 10, the second distribution pipe 29, and the Hot water of about 59 ° C. could be taken out through the second mixing valve 19, the second distribution pipe 29, and the three-way temperature switching valve 27.

At the same time, when a bath (not shown) set at 42 ° C. was supplied using the automatic hot water filling function of the fully automatic boiler 13, the bath could be filled with hot water at approximately 42 ° C. to the set water level.

The maximum temperature of hot water in the solar water heater 10 during the operation of the pump was about 81 ° C., and the amount of solar radiation on this day was about 4800 kcal / m ² · day.

Example 2 Under the same conditions as in Example 1,
After the pump 21 was stopped, if it was left as it was without using hot water at night, it was naturally cooled, and the temperature of the hot water was about 63 ° C. the next morning. Further, when the hot water was left without using hot water, the hot water temperature in the solar water heater 10 became 80 ° C. in the morning, the first temperature sensor 25 detected 80 ° C., and the pump 21 was activated. In the evening, the temperature of the hot water in the solar water heater 10 drops to 75 ° C
Then, the first temperature sensor 25 detects again, and the pump 21 stops.

The maximum temperature of the hot water in the solar water heater 10 during the operation of the pump was about 86 ° C., and the amount of solar radiation on this day was about 5200 kcal / m ² · day.

In the present invention, the temperature switching three-way valve 2
When a remote control that can be remotely operated is attached to the control unit 7, it is convenient to allow the temperature of the three-way valve 27 to be set from the room.

Further, in places where hot water is used such as baths and kitchens,
A display for displaying the hot water temperature in the solar water heater 10 detected by the first temperature sensor 25 in order to determine the set temperature of the temperature switching three-way valve 27 and determine whether to use the fully automatic boiler 13 or not. It is preferable to attach a meter.

[0063]

As described above, when the solar hot water supply system of the present invention is used, when the hot water temperature in the solar water heater is high, the hot water in the solar water heater can be used directly without passing through the fully automatic boiler. If the temperature of the hot water in the solar water heater is low, it can be reheated by a fully automatic boiler and used. In addition, since the automatic hot water filling function and the hot water function of the fully automatic boiler can be used, the usability is not impaired.

Further, even if a solar water heater is used at a pressure of 1 kg / cm ² or more and the hot water is not used for two days or more on a sunny day in summer, the pump is operated to circulate the hot water, thereby reducing the hot water temperature. The rise can be suppressed, or the first hot-pressure valve can be operated to discharge hot water to the outside.

Furthermore, even in the event of an abnormal situation such as a power failure or a pump failure, the second hot-pressure valve operates to discharge hot water to the outside. Is 1
Do not exceed 00 ° C.

Further, freezing in winter can be prevented without wrapping a heater band around a water supply pipe or a hot water supply pipe, and labor for construction can be saved.

Even when hot water is taken out through a fully automatic boiler, the hot water in the solar water heater only passes through the first mixing valve, so that the resistance is small and a decrease in hot water supply can be prevented.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a solar hot water supply system of the present invention.

FIG. 2 is a system diagram showing a conventional solar hot water supply facility.

[Explanation of symbols]

 Reference Signs List 10 solar water heater 11 water supply pipe 12 hot water supply pipe 13 fully automatic boiler 14 pressure reducing valve 16 first communication pipe 17 first mixing valve 18, 30 second communication pipe 19 second mixing valve 20, 31 third communication Pipe 21 Pump 22 First hot-pressure valve 23 Heater 24 Second hot-pressure valve 25 First temperature sensor 26, 41 Bypass pipe 27 Temperature switching three-way valve 28 First distribution pipe 29 Second distribution pipe 32 First Flow switch 33 First check valve 34 Second temperature sensor 35 Third temperature sensor 36 Second check valve 37 Third check valve 38 Fourth check valve 39 Fifth check valve 40 Fourth temperature sensor 41 Manual three-way valve 43 Water supply / water stoppage switching valve 44 First pressure relief valve 45 Second flow switch 46 Second pressure relief valve

Claims (5)

[Claims] 1. A solar water heater that heats water using solar heat, a water supply pipe connected to a water inlet of the solar water heater to supply water to the solar water heater, and a water heater connected to an outlet of the solar water heater. Solar heat comprising a hot water supply pipe for taking out hot water from a solar water heater, a first distribution pipe and a second distribution pipe branched from the hot water supply pipe, and a fully automatic boiler provided in the first distribution pipe. In a hot water supply facility, a pressure reducing valve is provided in a water supply pipe at a position lower than the solar water heater, and on a secondary side of the pressure reducing valve,
And a first communication pipe that connects the water supply pipe and the first distribution pipe at a position lower than the solar water heater, and a first mixing valve is provided at a connection portion between the first communication pipe and the first distribution pipe. A first communication pipe is connected to a water port of the first mixing valve, a first distribution pipe on the primary side of the fully automatic boiler is connected to a mixed water outlet of the first mixing valve, A second communication pipe that connects the water supply pipe and the hot water supply pipe is provided at a position higher than the communication pipe and at a position lower than the solar water heater, and the second communication pipe has a pump, a first hot-pressure valve, A third communication pipe communicating with the water supply pipe at a position lower than the second communication pipe at a water port of the second mixing valve, wherein a heater is provided, a second mixing valve is provided in the middle of the second distribution pipe; The second hot-pressure valve near the outlet of the solar water heater and the hot water temperature of the solar water heater First controlling the operation of the pump and
Is provided, a second temperature sensor for detecting an outside air temperature is provided near the solar water heater, a third temperature sensor for detecting a water temperature is provided in a water supply pipe, and a first side of a secondary side of the fully automatic boiler is provided. At the connection between the distribution pipe and the second distribution pipe, the first
A temperature switching three-way valve controlled by the temperature sensor of the first embodiment, and the set pressure of the pressure reducing valve is set to the first temperature pressure valve and the second pressure valve.
, And the set pressure of the first hot-pressure valve is set lower than the set pressure of the second hot-pressure valve, and the set temperature of the first temperature sensor for starting the pump is set to the first temperature.
Lower than the set temperature of the hot-pressure valve and the second hot-pressure valve,
And a set temperature of the first hot-pressure valve lower than a set temperature of the second hot-pressure valve, and operation of the pump and the heater is controlled by the second temperature sensor and the third temperature sensor. Hot water supply equipment. 2. A first check valve for allowing a flow from a hot water supply pipe to a water supply pipe and preventing a flow in a reverse direction is provided in the second communication pipe. A second check valve for permitting the flow from the water supply tap to the pressure reducing valve and preventing the flow in the reverse direction is provided, and a connection between the first communication pipe and the third communication pipe and the solar water heater. A third check valve for allowing flow from the pressure reducing valve to the solar water heater and preventing flow in the reverse direction is provided in the water supply pipe between the first and second water supply pipes. The fourth hot water supply pipe on the side of the second distribution pipe is provided with a fourth check valve for allowing flow in the direction in which hot water enters the first and second distribution pipes and preventing flow in the opposite direction. A fifth check valve is provided in the first distribution pipe on the secondary side of the switching three-way valve to allow the flow of hot water out of the temperature switching three-way valve and prevent the flow in the opposite direction. To be The solar hot water supply system according to claim 1, wherein: 3. A first flow switch is provided in the second communication pipe, and a second flow switch is provided in a hot water supply pipe on a side of the first and second distribution pipes from a connection portion with the second communication pipe. The solar hot water supply system according to claim 1, wherein 4. The solar hot water supply system according to claim 1, wherein a fourth temperature sensor is attached near the heater. 5. A first water supply pipe on a water supply tap side of a pressure reducing valve.
2. The solar hot water supply system according to claim 1, wherein a pressure relief valve is provided, and a second pressure relief valve is provided in a hot water supply pipe on a secondary side of the fourth check valve.