JPS6227333B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solar water heater that supplies hot water by mixing a solar water heater and hot water from a heater that generates hot water at a higher temperature than the hot water from the water heater.

This type of conventional hot water supply system uses a mixing valve to mix hot water from the solar water heater and the heater, so that hot water can be supplied at the temperature desired by the customer. However, when supplying hot water, there are cases where relatively low-temperature water is required, such as when washing the toilet or doing laundry, and there are cases where high-temperature water is required, such as when reheating a bathtub. Since it is necessary to set the temperature in a separate area, it has the disadvantage of requiring an expensive control device with a wide control range and a mixing valve.

The present invention has been made in view of the above-mentioned facts, and provides hot water supply by mixing a solar water heater and hot water from a heater that generates hot water at a higher temperature than the hot water of the water heater in accordance with a control signal from a control device. In those equipped with a mixing valve, the control device has a proportional control function that adjusts the water mixing ratio of the mixing valve so that the hot water supply side temperature of the mixing valve reaches a predetermined temperature within a predetermined temperature range, and a solar heat The feature is that it has a low temperature and high temperature control function that prioritizes the hot water of the water heater and the heater, respectively, and that the operation part of the control device is installed in the hot water usage part, so that when normally hot water is supplied, it is connected to the solar water heater and the heater. The system mixes the hot water in the water heater to obtain a constant temperature requested by the customer, and when supplying relatively low-temperature water for washing, washing, etc., only the hot water from the solar water heater is supplied. Make effective use of hot water, and when supplying high-temperature water such as reheating a bathtub, only hot water from the heater is supplied, so that optimal hot water can be supplied by simple operation at the hot water usage section. At the same time, the purpose is to simplify the control device and the mixing valve.

Hereinafter, one embodiment of the present invention will be described based on the drawings. FIG. 1 is a system diagram of a solar hot water supply system according to the present invention. 1 is a so-called natural circulation solar hot water system that heats water supplied from a water supply pipe 2 by collecting solar heat and stores it as hot water. The hot water from the water heater 1 is supplied through a pipe 3 to the first inlet C of a proportional three-way mixing valve 4 (hereinafter referred to as a mixing valve), and the hot water is supplied to the heater through a pipe 5 branching from the pipe 3. 6 and reheated in the heater 6 using oil, gas, or electricity is supplied to the second inlet H of the mixing valve 4 through a pipe 7. 8 is a hot water pipe connected to the outlet M of the mixing valve 4;
Hot water is supplied to a washstand 11 and a bathtub 12 via collars 9 and 10.

Reference numeral 13 denotes a control device for the mixing valve 4, which includes a temperature detector 14 that detects the temperature of the hot water pipe near the outlet M of the mixing valve 4, and a remote temperature sensor that is installed in hot water usage areas such as indoor bathrooms and washrooms. a setting device 15; a control signal generator 16 that compares the temperature signal of the temperature detector 14 with the setting signal of the temperature setting device 15 and adjusts the water mixing rate of the mixing valve 4 so that the hot water temperature approaches the set temperature; Consisting of As shown in detail in FIG. 2, the temperature setting device 15 has a proportional control region 17 that emits an arbitrary temperature setting signal within a predetermined range (for example, 42 to 44 degrees Celsius), and a temperature setting signal for extremely low temperatures (for example, below 0 degrees Celsius). A low-temperature control region 18 that generates a high temperature control region 18 and a high-temperature control region 19 that generates a temperature setting signal of an extremely high temperature exceeding the maximum hot water temperature of the heater 6 (for example, 100° C. or higher) can be selected using a knob 20. There is.

First, the temperature setting device 15 is set to the proportional control area 1.
7, the control device 1
3, the temperature signal from the temperature detector 14 is sent to the temperature setting device 15.
A control signal is generated from the control signal generator 16 to the mixing valve 4 so as to match the temperature setting signal of the mixing valve 4.
Adjust the water mixing ratio. That is, when the hot water temperature of the hot water pipe 8 is lower than the set temperature, the hot water supplied from the first inlet C is throttled, and the hot water supplied from the second inlet H is
By increasing the hot water supplied from the outlet M
Increase the temperature of the hot water flowing out from the hot water pipe 8.
When the hot water temperature is higher than the set temperature of the temperature setting device 15, the temperature of the hot water pipe 8 is increased by increasing the hot water supplied from the first inlet C and throttling the hot water supplied from the second inlet H. Try to lower it. In this way, in the proportional control area 17, proportional control is performed by mixing the hot water from the solar water heater 1 and the heater 6, and hot water is supplied from the cookers 9 and 10 at the set temperature.

Next, when the temperature setting device 15 is set to the low temperature control region 18, an extremely low temperature setting signal is output from the temperature setting device 15, so the temperature signal of the temperature detector 14 is always larger than the temperature setting signal, and a control signal is generated. The device 16 issues a control signal to open only the first inlet C of the mixing valve 4 and close the second inlet H. For this reason, the solar water heater 1 is connected to the hot water pipe 8.
Only hot water is supplied and discharged from the taps 9 and 10. In this case, relatively low-temperature hot water is convenient for hot water supply for washing, washing, etc., and the hot water from the solar water heater 1 can be effectively used without using the hot water from the heater 6.

When the temperature setting device 15 is set to the high temperature control region 19, an extremely high temperature setting signal is output from the temperature setting device 15, so the control device 13 controls the mixing valve 4 so that only the second inlet H is opened. Then, only the high temperature water of the heater 6 is supplied from the cylinders 9 and 10.

In this case, it is convenient to reheat the bathtub 12, and the temperature of the bathtub 12 can be raised to an appropriate temperature by supplying a small amount of hot water.

As described above, the present invention includes a proportional control function that causes the control device 13 to maintain hot water at a set temperature within a predetermined temperature range, and low-temperature and high-temperature control that prioritizes hot water supply of the solar water heater 1 and the heater 6, respectively. In addition to providing the functions, the temperature setting device 15 and other operation parts of the control device 13 are provided in the hot water usage part, so that hot water can be supplied from the solar water heater 1 as well as hot water by proportional control with simple operation in the hot water usage part. Hot water from the solar hot water heater 1 can be selected to be supplied from the hot water heater 6 or from the heater 6, and hot water from the solar water heater 1 can be effectively used when relatively low hot water is required. Therefore, a wide proportional operation range and a wide range of precise valve operation are no longer required, and these can be constructed easily and inexpensively.

In the above embodiment, the hot water from the solar water heater 1 was directly supplied to the first inlet C of the mixing valve 4 and the heater 6, but the hot water from the solar water heater 1 was first supplied to the hot water tank (Fig. (not shown) and may be supplied from a hot water storage tank. Alternatively, a so-called forced circulation type solar water heater may be used, in which the solar water heater is separated into a heat collector and a hot water storage tank, and a heat medium is circulated.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a solar water heating system according to an embodiment of the present invention, and FIG. 2 is a detailed front view of the temperature setting device used in FIG. 1. 1...Solar water heater, 4...Mixing valve, 6...Heater, 13...Control device, 15...Temperature setting device (operation unit).

Claims (1)

[Claims] 1. A solar water heater and a mixing valve that mixes hot water from a heater that generates hot water with a higher temperature than the hot water of the water heater in accordance with a control signal from a control device to supply hot water, and the control device controls the temperature on the hot water supply side of the mixing valve. It has a proportional control function that adjusts the water mixing ratio of the mixing valve so that the water reaches a predetermined temperature within a predetermined temperature range, and a low temperature and high temperature control function that prioritizes the hot water of the solar water heater and heater, respectively. What is claimed is: 1. A solar hot water supply device characterized in that the operating section is provided in the hot water utilization section.