JP2003232565A - Hot water supply apparatus using solar energy - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of a hot water supply apparatus using solar energy, wherein as a hot water supply temperature control valve, two of a hot water supply temperature control vale and a boiler feed water temperature control valve are needed causing complicated piping, and further since a switching valve is provided in a water hot supply port of a boiler, outdoor specifications and special rainwater-proof structure are needed, and the appearance of pulling a wire and the executability of work for piping are inferior. <P>SOLUTION: In this hot water supply apparatus S1 using solar energy, main hot water supply pipes 9, 24, 22c, 22a connected between a hot water storing tank 7 and a hot water supply plug 17 are provided with temperature control means 11, 10a for mixing water. An auxiliary hot water supply pipe 22b for supplying hot water through a boiler 8 is connected to the downstream side of the temperature control means in the main hot water supply pipes. Switching means 15, 23 capable of selecting the supply of water from the temperature control means side to the boiler 8 or the supply of hot water to the hot water supply plug are provided on the upstream side of the auxiliary hot water supply pipe in the main hot water supply pipes. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar heat system for heating water in a hot water storage tank by using a heat medium heated by a heat collecting means utilizing solar energy. The present invention relates to a hot water supply device. 2. Description of the Related Art In a conventional forced circulation solar hot water supply apparatus J, as shown in FIG. 3, a heat medium is heated by a heat collector 1 provided outdoors and then collected. The heat exchanger 5 is circulated by the operation of a pump 4 provided in a heat medium pipe 3 (an outgoing pipe 3a and a return pipe 3b) connected between the vessel 1 and the hot water tank 2, and provided in the hot water tank 2. Thus, the water in the hot water storage tank 7 in the hot water storage tank 2 is heated. At this time, since the required amount of heat may not be secured by the heat collector 1 alone, the boiler 8 or the like is used as an auxiliary heat source as shown in the figure. [0003] As described above, the heat medium heated by the heat collector 1 is heat-exchanged by the heat exchanger 5 in the hot water storage tank 7, and the water in the hot water storage tank 7 is heated to be stored in the hot water storage tank 7. The extension pipe 9b of the hot-water supply pipe 9 and the extension pipes 10a and 10c of the water supply pipe 10 connected to the hot-water storage tank 7 are connected to the hot-water supply temperature control valve 11, so that hot water in the hot-water storage tank 7 can be heated at an appropriate temperature. [0004] A switching valve 15 is connected to the tapping side of the hot water supply temperature control valve 11, and it is possible to select which of the hot water tank 2 and the boiler 8 to tap. This switching valve 1
5 is an electric three-way valve in general, and the switching is performed automatically at a temperature set by a user. A hot-water tap 17 is connected to the switching valve 15, and a water stop valve 18 for stopping hot water supply is mounted on the way. The boiler inlet temperature control valve 12 has an extension pipe 9a for the hot water supply pipe 9 and an extension pipe 10b for the water supply pipe 10.
It is also possible to set the temperature of the hot water in the hot water storage tank 7 to a temperature at which it can enter the boiler 8 and minimize the heating by the boiler 8. The hot water supply temperature control valve 11 for mixing the hot water from the hot water supply pipe 9 and the water from the water supply pipe 10 is used for temperature control for hot water supply. In addition, the temperature of the hot water in the hot water storage tank 7 is low, and the temperature of the hot water supplied from the hot water storage tank 7 via the hot water supply pipe 9 and the water from the water supply pipe 10 are mixed with the boiler water temperature control valve 12 for water supply to the boiler 8. The water is supplied and heated by the boiler 8 to raise the temperature of hot water, and then the hot water is discharged, or the water is supplied as it is and heated. The hot water supply temperature adjustment valve 11 can adjust the hot water supply temperature by operating the motor of the hot water supply temperature adjustment valve 11 by the control board 13. In this hot water supply, the water drawn from the water supply pipe 10 and the hot water storage tank 7 are used.
The hot water inside is appropriately mixed to control the tapping temperature. Settings such as tapping temperature can be set by the remote control controller 14. The boiler water inlet temperature adjustment valve 12 has a water inlet temperature set at 30 to 35 ° C. for temperature adjustment in the boiler 8, and automatically adjusts the temperature to the set temperature to supply water to the boiler 8. . A switching valve 15 for selecting whether to use the hot water of the hot water storage tank 2 or the hot water obtained by heating in the boiler 8 is attached to the hot water outlet 8a of the boiler 8, so that each of the above-mentioned components is provided. You can choose which hot water to tap. This selection is made by the remote controller 14.
May be performed manually, but it is also possible for the control board 13 to make automatic selection. In the case of a hot water supply device equipped with an automatic hot water filling function or the like, a water stop valve 18 is provided between the switching valve 15 and the hot water tap 17 so that the control board 13 automatically stops tapping. I try to make it. In the figure, 6 is an expansion tank, 19 is a bathtub, and 21 is a hot water temperature sensor. [0010] Like the hot water supply device described above, the hot water storage tank 7
There is a case where hot water heated inside is mixed with water and supplied with hot water from a hot water tap 17, or a case where hot water and water are mixed and then supplied to a boiler 8 and heated and supplied with hot water from a hot water tap 17. Temperature control valve for hot water supply 1 as temperature control valve for hot water supply
1 and at least two of the boiler inlet temperature control valves 12 are required, which not only complicates the piping, but also
Extra components are also required. In addition, a large number of parts are required,
Since the piping becomes complicated and a piping space is required, the entire apparatus becomes large. Further, using the hot water tank 2 or the boiler 8
The switching valve 15 for selecting whether or not to use is installed near the outlet 8a of the boiler 8, so that it is installed outdoors.
For this reason, in order to route the control / power cable of the switching valve 15 to the hot water storage tank 2, an outdoor specification or a special rain-proof structure is required, and there is a problem that the appearance of the wiring and the workability of the piping are poor. . Accordingly, the present invention has been devised in view of the above-mentioned problems, and provides an excellent solar water heating water supply apparatus which can easily operate in cooperation with an auxiliary heat source with a simple configuration and can be reduced in size. The purpose is to provide. [0014] In order to solve the above-mentioned problems, a solar hot water supply apparatus of the present invention uses a heat medium heated by a heat collecting means that uses solar energy to store heat in a hot water storage tank. What is claimed is: 1. A solar hot water supply apparatus configured to heat water, wherein a temperature adjusting means capable of mixing water is provided in a main hot water pipe connected to the hot water storage tank and a hot water tap, and the temperature adjustment in the main hot water pipe is performed. On the downstream side of the means, an auxiliary hot water supply pipe for supplying hot water from an auxiliary heat source is connected, and on the upstream side of the auxiliary hot water supply pipe in the main hot water supply pipe, water is supplied from the temperature adjusting means side to the auxiliary heat source. Supply or
Switching means for selecting whether to supply hot water to the hot-water tap side is provided. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a solar water heating apparatus according to the present invention will be described in detail with reference to the drawings schematically shown. It is to be noted that the same members described above are denoted by the same reference numerals, and redundant description will be omitted. As shown in FIG. 1, a solar water heater S
1 is a heat medium pipe 3 (going pipe 3a, return pipe 3) between a hot water storage tank 2 and a heat collector 1 which is a heat collecting means using solar energy.
b) is connected, and a pump 4 such as an electric pump for circulating the heat medium of the antifreeze contained in the heat medium pipe 3 is connected to the heat medium pipe 3, and the heat medium heated by the heat collector 1 is used. Thus, the water in the hot water storage tank 7 is heated. The heat medium heated by the heat collector 1 is subjected to heat exchange in the heat exchanger 5 in the hot water storage tank 7 to make the water in the hot water storage tank 7 hot water and stored in the hot water storage tank 7. The heating medium is generally
An antifreeze containing propylene glycol as a main component, a rust preventive for metals such as iron and copper used for piping, a dye, and water is used. Further, the circulation pump 4 is mainly disposed on the side of the outgoing pipe 3a of the heat medium pipe 3, but is not limited to this. A main hot water supply pipe (hot water supply pipes 9, 24, 22c, 22a) connected between hot water storage tank 7 and hot water tap 17 is provided.
Is provided with a temperature control means (temperature control valve 11, extension pipe 10a of water supply pipe 10) for mixing water, and a boiler 8 as an auxiliary heat source is provided downstream of the temperature control valve 11 of the temperature control means in the main hot water supply pipe. A hot water supply pipe 22b of an auxiliary hot water supply pipe for supplying hot water is connected via the hot water supply pipe, and water whose temperature has been adjusted by the temperature adjusting means is supplied to the boiler 8 upstream of the hot water supply pipe 22b in the main hot water supply pipe. Switching means (switching valve 15, switching valve 15) for selecting whether to supply hot water to hot water tap 17 side as it is.
A water inlet pipe 23) is provided. Thus, the heat medium heated by the heat collector 1 is exchanged with the heat exchanger 5 in the hot water storage tank 7 and collected with the hot water storage tank 7 so that the water in the hot water storage tank 7 becomes hot water. When the hot water in the hot water storage tank 7 is at a temperature usable for hot water supply by the switching valve 15 and circulates between the heater 1 and the hot water, the hot water can be directly supplied to the hot water tap 17 side. The temperature of the hot water from the hot water storage tank 7 is controlled by the control board 13 which reads data from a hot water temperature sensor 20 composed of a thermistor provided at the outlet of the temperature control valve 11 and controls the switching valve 15. Temperature setting can be remotely controlled by a controller 14 installed indoors. A hot water pipe 22b from the outlet of the boiler 8 is connected to a hot water pipe 22a connecting the switching valve 15 and the hot water tap 17, but the switching valve 15 prevents backflow from the water inlet pipe 23 of the boiler 8. Therefore, the hot water that has flowed into the hot water supply pipe 22b does not flow backward due to the pressure of the water remaining in the boiler 8. On the other hand, when the hot water in the hot water storage tank 7 is at a low temperature which is not suitable for hot water supply, the switching valve 15 is supplied to the water inlet side of the boiler 8 and the temperature is adjusted to the boiler water inlet limit temperature by the temperature control valve 11. Water is supplied to the boiler 8 above. At this time, the incoming water temperature is set to 30 to 35 ° C. in order to enable temperature adjustment in the boiler 8. The data of the hot water supply temperature sensor 20 provided on the tapping side of the temperature control valve 11 is transmitted to the control board 1
3 reads and controls the switching valve 15 to adjust the incoming water temperature. Here, a part of the hot water discharged from the boiler 8 goes around the hot water supply pipe 22c, but does not flow backward due to the pressure of the water remaining in the hot water supply pipe 22c. These switching operations may be performed automatically or manually by the control board 13 based on the measured temperatures of the respective parts. The temperature of the upper part of the hot water storage tank 7 is based on the data of the hot water temperature sensor 21 attached to the hot water storage tank 7 on the control board 1.
3 is read, whether the setting of the hot water supply temperature is possible with the hot water in the hot water storage tank 7, whether the additional heating by the boiler 8 is necessary,
Further, it is determined whether to stop the heat exchange so that the temperature in the hot water storage tank 7 does not exceed the specified value. Thus, according to the solar hot water supply apparatus S1, the hot water supply temperature can be controlled with a simple configuration of one temperature control valve 11 and one switching valve 15, and the switching valve conventionally had to be installed outdoors. 15 can be disposed in the hot water storage tank 2, whereby the whole apparatus can be downsized. Further, a switching valve 15 is provided on the water inlet side of the boiler 8.
Can be provided, whereby the switching valve 15 can be provided in the hot water storage tank 2, so that the weather resistance grade of the switching valve 15 can be relaxed, and the piping can be simplified. In addition, the outdoor specification and special rainproof structure for routing the control signal line and the power cable of the switching valve 15 for hot water supply to the hot water storage tank 2 are not required, and the appearance of the wiring and the workability of the piping are improved. can do. Next, a description will be given of a solar hot water supply apparatus S2 provided with a flow counter 16 shown in FIG. The flow counter 16 is attached to a pipe (hot water supply pipe 25) on the tapping side of the temperature adjustment valve 11 (downstream of the portion where the hot water supply temperature sensor 20 is provided). Further, a switching valve 15 for switching hot water supply to the hot water storage tank 7 and the boiler 8 and a water stop valve 18 for stopping hot water are mounted in front of the hot water tap 17. This water stop valve 18
Is an electrically operated two-way valve or a solenoid valve. Further, as the flow counter 16, various flow meters such as a differential pressure type, a turbine type, and a target type can be applied. Thus, according to the solar hot water supply apparatus S2, when the bathtub 19 is to be automatically filled with hot water, the flow rate data from the flow rate counter 16 is sent to the control board 13, and it is determined that the flow rate reaches the preset level. When it is determined, the control board 13 closes the water stop valve 18 to stop the hot water supply. Hot water may be supplied from either the hot water storage tank 7 or the boiler 8. However, when the hot water temperature falls below the set temperature during hot water supply from the hot water storage tank 7, the switching valve 15 is turned on. By switching to hot water supply from boiler 8, hot water supply temperature can be maintained. Further, when hot water from either the hot water storage tank 2 or the boiler 8 is filled into the bath 19,
It is not necessary to check the state of hot water every time, a predetermined amount of hot water can be stored in the bathtub 19, and the operation is simple. In this embodiment, a solar water heater using a heat collector as a heat collecting means and a boiler as an auxiliary heat source has been described as an example. However, the present invention is not limited to these. It can also be applied to a hot water supply device using a heat pump using
Any hot water supply device capable of switching hot water supply from an auxiliary heat source such as a hot water storage tank and a boiler may be used, and may be appropriately modified and implemented without departing from the gist of the present invention. As described above in detail, according to the solar hot water supply apparatus of the present invention, hot water supply to the hot water tap and water supply to the auxiliary heat source can be performed by the temperature control means and the switching means for hot water supply. Thus, the number of parts can be reduced and the size of the apparatus can be reduced. Since the hot water in the hot water storage tank is used for entering the auxiliary heat source, even if the temperature of the hot water in the hot water storage tank is lowered to a temperature unsuitable for hot water supply, the temperature can be effectively used. Kerosene and electric energy used for additional cooking can be reduced. Furthermore, a switching means (particularly, a switching valve) can be provided on the water inlet side of the auxiliary heat source, so that the switching valve can be provided in the hot water tank, so that the weather resistance grade of the switching valve is reduced. And simplifies piping. Further, an outdoor specification or a special rainproof structure for routing the control signal line of the switching valve and the power cable to the hot water tank are not required, and the appearance of the wiring and the workability of the piping can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall configuration diagram schematically illustrating an embodiment of a solar hot water supply apparatus according to the present invention. FIG. 2 is an overall configuration diagram schematically illustrating another embodiment of the solar hot water supply apparatus according to the present invention. FIG. 3 is an overall configuration diagram schematically illustrating an example of a conventional solar water heater. [Description of References] J: Conventional solar water heaters S1 and S2: Solar water heater 1 of the present invention 1: Heat collector 2: Hot water tank 3: Circulation pipe 3a: Outgoing pipe 3b: Return pipe 4: Circulation pump 5 : Heat exchanger 6: Expansion tank 7: Hot water storage tank 8: Boiler (auxiliary heat source) 9: Hot water supply pipe 10: Water supply pipe 11: Temperature control valve for hot water supply 12: Temperature control valve for boiler water input 13: Control board 14: Controller 15 : Switching valve 16: Flow counter 17: Hot water tap 18: Water stop valve 19: Bathtub 20: Hot water temperature sensor 21: Hot water temperature sensor 22: Hot water pipe 23: Water inlet pipe

Claims (1)

Claims: 1. A solar hot water supply device configured to heat water in a hot water storage tank by using a heat medium heated by a heat collecting means that uses solar energy, wherein the hot water storage tank is provided. An auxiliary hot water supply pipe for supplying hot water from an auxiliary heat source downstream of the temperature adjusting means in the main hot water supply pipe while providing a temperature adjusting means capable of mixing water in a main hot water supply pipe connected to the main hot water supply pipe; And a switch which can select whether to supply water to the auxiliary heat source from the temperature adjusting means side or to supply hot water to the hot water tap side on the upstream side of the auxiliary hot water supply pipe in the main hot water supply pipe. A solar water heater utilizing means for providing solar water.