JPS58120050A - Solar heat hot-water supplying system - Google Patents

Abstract

PURPOSE:To enable to miniaturize a hot-water supplying and reserving tank and supply the hot-water immediately after opening a cock by a method wherein the hot- water supplying and reserving tanks are provided for each cocks at the vicinities thereof. CONSTITUTION:A heat collector 21, collecting solar heat, the hot-water reserving tanks 29, 30, storing the collected heat, heat collecting pipe lines 23, 24, connecting the heat collector and the hot-water reserving tank, and a heat collecting pump 22 are provided. A heat exchanger 28, effecting heat exchange with water in a bathtab 27 and the hot-water supplying and reserving tanks 29, 30 having the heat exchangers 31, 32 are provided at the vicinities of each hot-water supplying cocks 45, 46 while these heat exchangers are connected in series by a heat collecting pipe line and bypass pipes 36- 38 are provided for said heat exchnagers. Further, path switching valves 33-35, selecting the heat collecting pipe lines and the bypass pipes, are provided while the bypass pipe 26, having the path switching valve 25 and bypassing the heat collector 21, is provided at the discharging side of the heat collecting pump 22. As a result, the hot- water supplying and reserving tank may be miniaturized, the amount of collected heat may be used without waste, and thereby contriving to improve the value of increasing temperature and retrieve the waste heat thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solar water heater that uses solar heat to produce hot water for hot water supply or bathing.

There is a conventional solar water heater as shown in FIG. In this solar water heater, a heat medium heated by a solar heat collector 1 that collects solar heat is passed through a heat collection return pipe 3, which is a heat collection pipe, by a heat collection pump 2 to exchange hot water in a hot water storage tank 4. The heat medium sent to the heat exchanger 6 and exchanged heat with the water in the hot water storage tank 4 returns to the heat collector 1 via the heat collection feed pipe 6, forming a circulation circuit. The heated hot water in the hot water supply tank 4 is sent to faucets 8 and 9 through a hot water supply pipe 7, and is used in a bathtub 1o, a sink, etc.

The conventional solar water heater constructed in this manner has the following drawbacks.

(1) In order to reduce the amount of hot water used in baths and sinks, hot water storage tanks need to have a large capacity, and the large tanks pose problems in terms of handling and installation space.

(2) When hot water is supplied from the faucets 8 and 9, hot water cannot be supplied until after the cold water in the hot water supply pipe 7 between the faucets 8 and 9 and the hot water supply tank 4 has been drained, making it difficult to use. In addition, when the faucets 8 and 9 are closed, the faucet is closed with hot water remaining in the hot water supply pipe 7, so the hot water turns into cold water in the hot water supply pipe 7, which is a usage condition that is contrary to energy conservation. Ta.

(3) Because the hot water supply tank is large and constant, a large amount of heat collection energy is required even though only a small amount of hot water is used, and there is a problem in that the temperature inside the tank is low, especially when it is cloudy and there is low sunlight.

The present invention eliminates the drawbacks of conventional solar water heaters, makes the hot water storage tank smaller, makes it possible to use the collected heat without wasting it, improves the temperature rise value, and furthermore recovers waste heat. It is an object of the present invention to provide a solar water heater that also performs the following functions.

To achieve this objective, the present invention provides a bathtub with a heat exchanger for exchanging heat with the water in the bathtub, and a hot water storage tank with a heat exchanger near each hot water faucet, and connects these heat exchangers in series. A heat collecting pipe is provided in the heat exchanger, and a route switching valve is provided to configure a bypass pipe of the heat exchanger and select between the heat collecting pipe and the bypass pipe, and further, a route switching valve is provided on the discharge side of the heat collecting pump. , a bypass pipe that bypasses the heat collector.

With this configuration, a hot water storage tank is provided near the faucet for each faucet, so the hot water storage tank can be designed to be compact, and hot water can be supplied immediately after opening the faucet. In addition, by switching the path switching valve to the heat collecting circuit side when the temperature is below the setting of the temperature detector,
It is possible to raise the temperature of the hot water storage tank from 1 degree to the approved temperature. Furthermore, by switching the path switching valve to the bypass pipe side, the exhaust heat from the bathtub can be recovered to the hot water supply tank.

Next, one embodiment of the present invention will be described using the drawings of FIG. 1, FIG. 2, and FIG. 3.

In the figure, 21 is a heat collector, and the heat collector 21 is connected to a heat collection feed pipe 23 which is a heat collection pipe from a heat collection pump 22.
A heat collection return pipe 24 is installed, and an electric three-way valve 2 is installed on the discharge side of the heat collection pump 22 as a route switching valve.
The heat collecting return pipe 24 is connected to a heat exchanger 28 which exchanges heat with the water in the bathtub 27, and into the hot water storage tanks 29 and 30. The heat collection pump 22 is connected in series to the heat exchangers 31 and 32 provided in the
It is connected to the. In addition, the bathtub 27 and the hot water storage tank 29
．． On the heat collection return pipe 24 on the inlet side of the heat exchanger 2B, 31.30, an electric three-way valve 33, 3 is installed as a route switching valve.
4, 36 are connected and bypass pipes 36, 37.
38 is piped to the electric three-way valve 33, 34.3
6 is linked to a temperature detector sensor 39 that detects the water temperature in the bathtub 27 and a sensor 40 that detects the water temperature in the hot water storage tank 2'9. On the other hand, from the hot water supply tank 29, a hot water supply pipe 43 is provided.
A faucet 46 provided near the hot water supply tank 29 via the tap 4
A water supply pipe 46 from city water is also piped to the faucet 46 via a valve 47. 48 is
This is a water supply pipe to the hot water supply tank 29.

A hot water supply pipe 6o is connected from the hot water supply tank 3o to a faucet 49 provided nearby. 61 is a water supply pipe. 62
indicates a control box.

Next, the operation during heat collection and hot water supply in the above configuration will be explained with reference to FIG. If the set temperature is 60°C, the sensor 42, sensor 39 and 4o
When the temperature difference between the
4 is switched υ, the heat collector 2 is discharged from the heat collector pump 22.
The heat medium whose temperature has been raised by heating in bathtub 27. The temperature of the water in the hot water supply tank 29 is raised to zero, and when the sensor 39 detects 40°C, the electric three-way valve 33 is switched to the bypass pipe 36 side, and the temperature rise of the bathtub 27 is stopped. .

Therefore, the heat medium flows only to the heat exchanger 31 of the hot water supply tank 29, and the temperature of the water in the hot water supply tank 29 continues to rise. When the temperature inside the hot water supply tank 29 reaches 60° C., the electric three-way valve 34 is switched to the bypass pipe 37 side, the heat collection pump 22 is stopped, and heat collection is completed.

Next, the operation of supplying hot water from the faucet 46 near the hot water supply tank 29 will be explained. For example, when supplying hot water at 60°C, hot water can be supplied by opening the valve 44.
When hot water at 6°C is required, hot water from the hot water pipe 43 and cold water from the water supply pipes 46 are mixed by adjusting the balloon and the pulp 47 to supply hot water. be able to.

Next, the operation during exhaust heat recovery will be explained with reference to Fig. 3.
When the operation of the control box is switched from the bathtub 27 to the hot water supply tank 3o to recover waste heat, the electric three-way valve 26 on the discharge side of the heat collecting pump 22 (not shown)
At the same time, the electric three-way valves 33 and 36 are switched so that the heat medium flows through the heat exchangers 28 and 32, and the heat collecting pump 22 starts operating, and the electric three-way valves 33 and 36 are switched to open the bathtub 27. The exhaust heat is recovered to the hot water supply tank 3o. In addition, sensor 3
When the temperature difference between the heat pump 9 and the sensor 41 reaches the set value, the heat collection pump 22 is stopped and exhaust heat recovery is completed.

In an embodiment of the invention, sensors 33, 34° 36
By arbitrarily selecting the set temperature, there is an advantage that the temperature can be raised to a temperature suitable for the purpose. Also, the bathtub
It can be used as a hot water storage tank. Furthermore, when not taking a bath, it is possible to collect heat only in the hot water storage tank 29°3o, and the heat can be collected at a much higher temperature.

As described above, the present invention provides a bathtub with a heat exchanger that exchanges heat with the water in the bathtub, and a hot water storage tank with a heat exchanger near each hot water faucet, and connects these heat exchangers in series to collect heat. In addition, a route switching valve is provided on the discharge side of the heat collecting pump to configure the bypass pipe of the heat exchanger and select between the heat collection pipe and the bypass pipe. By configuring the bypass pipe, the following effects can be obtained.

(1) It is possible to install a hot water storage tank near each hot water faucet and raise the temperature to suit the purpose.

In particular, after a small hot water storage tank is heated to a high temperature, it can be mixed and used as a low temperature appropriate temperature, and a large amount of heat can be collected with a small hot water storage tank. Therefore, since the hot water supply tank can be designed to be compact, the cost is low, construction is easy, and the installation space can be significantly reduced.

(2) Since the hot water storage tank is provided near the faucet, hot water is immediately supplied when the faucet is opened. In addition, because the length of the hot water pipe connecting the faucet and the hot water storage tank is short, even after the faucet is closed, heat radiated from the hot water pipe is extremely small, resulting in an energy-saving system.

It is Tem.

(3) Since it is composed of multiple hot water storage tanks, it is possible to raise the temperature of the hot water in the hot water storage tank to a high temperature even on days with low solar radiation! 7. Easy to use.

(4) It is possible to recover the waste heat from the bathtub into another hot water supply tank, and the practical effect thereof is extremely large.

[Brief explanation of the drawing]

Fig. 1 is a system configuration diagram in an embodiment of the present invention, Fig. 2 is a system configuration diagram showing the operation during heat collection in Fig. 1, and Fig. 3 is a system configuration diagram showing the operation during exhaust heat recovery in Fig. 1. System configuration diagram: FIG. 4 is a system configuration diagram in a conventional example. 21... Heat collector, 22... Heat collection pump, 23... Heat collection piping (heat collection feed pipe), 24...
... Heat collection pipe (heat collection return pipe), 27 ... Bathtub, 2B, 31.32 ... Heat exchanger, 33,3
4, 35...Route switching valve (electric three-way valve), 3
6, 37, 38... Bypass pipe, 39, 40,
41...Temperature detector (sensor) 0

Claims (2)

[Claims] (1) It has a heat collector that collects solar heat, a hot water storage tank that stores the collected heat, a heat collection pipe that connects the heat collector and the hot water storage tank, and a heat collection pump installed in the heat collection pipe. The bathtub is equipped with a heat exchanger that exchanges heat with the water in the bathtub, and a hot water storage tank with a heat exchanger near each hot water faucet. A route switching valve is provided to configure the bypass pipe of the heat collecting pipe and the bypass pipe, and a route switching valve f is provided on the discharge side of the heat collecting pump.
1. A solar water heater characterized in that it has a bypass pipe that bypasses a heat collector. (2) The route switching valve for selecting the heat collection pipe and the bypass pipe is an electric three-way valve that is linked to a temperature sensor that detects the temperature of hot water in a bathtub, hot water storage tank, etc. The solar water heater according to item 1.