JPS5834381Y2 - Solar hot water heating storage device - Google Patents

Description

[Detailed description of the invention] This invention heats water for hot water supply by circulating a heating medium that has absorbed solar heat in a hot water tank and a heat storage tank that are separated.
The present invention relates to a device that stores solar heat in stored water for purposes such as heating.

A conventional device of this kind has the configuration shown in FIG.
When the outlet heat medium temperature Ta of the heat collector 5 detected by the detector 4 is higher than the temperature Tb of the stored water in the heat storage tank 2 detected by the detector 4, the differential temperature controller 8 issues an operation signal for the heat collector pump 7. The heating medium starts collecting heat, and at that time, if the temperature Ta of the outlet side heating medium is higher than the temperature Tc of the hot water in the hot water tank 1 detected by the detector 3, the signal from the differential temperature controller 12 The flow path of the automatic three-way valve 11 is switched and the heat medium flows through the circulation path passing through the heat exchanger 9,
When Ta is lower than Tc, the automatic three-way valve 11 returns and the heat medium flows through the circulation path passing through the heat exchanger 10, so that Ta is lower than Tb.
The heat collecting pump 7 is designed to stop in the following cases.

Note that 17 is a water supply pipe, 18 is a hot water supply pipe, and 19.20 is a pipe for using stored hot water.

A device having such a configuration is wasteful in that it is not used even though the temperature of the heat medium that has completed heat exchange by the heat exchanger 9 in the hot water tank 1 is higher than the temperature of the stored hot water in the heat storage tank 2. Not only that, but the temperature on the inlet side of the heat collector 5 becomes relatively high, resulting in poor heat collection efficiency.

In order to eliminate this drawback, a solar heat hot water heating and storage device as shown in FIG. 2 was proposed.

This device includes a first heat medium circulation path that passes through a heat exchanger 9 in a hot water tank 1 and a second heat medium circulation path that directly passes through a heat storage tank 2. A conduit for passing the second heat medium circulation path from downstream of the heat exchanger 9 in the path is configured, and electromagnetic valves 11, 13 and 1 for switching the path are provided.
6 are arranged at each switching point, and the relationship between the temperature Ta of the heat medium on the outlet side of the heat collector 5, the temperature Tc of the hot water in the hot water supply tank 1, and the temperature Tb of the heat medium in the heat storage tank 2 becomes Ta>Tc. When Tc > Ta > Tb, the second heat medium circulation path is passed, and the heat exchange is completed by the heat exchanger 9 in the hot water tank 1. The heat medium passes through the first and second circulation paths only when the temperature Td of the heat medium satisfies the relationship Ta>Tc>Td>Tb.

In this device, in order to perform the above action, four
3 temperature detectors 3, 4, 6.14, 3 switching solenoid valves 11, 13.16, and 2 differential temperature controllers 12
．． 15, and the configuration is much more complicated than that shown in FIG.

Furthermore, if we examine the action in detail, we find that Td should be almost equal to Tc due to the function of the heat exchanger 9, and unless TC is considerably higher than Tb, the heat medium after heat exchange should be transferred to the heat storage tank 2. Even if it is sent, there is little use of heat.

The reason is that when the load (hot water supply) is large, Tc decreases and T
This is because the difference between c and Tb becomes smaller.

For this reason, the device shown in FIG. 2 cannot be expected to have any great effects, even though it has a complicated configuration.

The present invention aims to enhance the solar heat utilization effect without complicating the configuration.

An embodiment of this invention is shown in FIG.

This device is different from the device shown in FIG. is connected to one end of the hot water supply heat exchanger 21 disposed in the heat storage tank 2, and the other end of the hot water supply heat exchanger 21 is made to face the bottom of the hot water supply tank 1.

As a result of this configuration, the outlet side heat medium temperature Ta of the heat collector 5
When Ta is higher than the stored water temperature Tb in the heat storage tank 2, the heat medium starts collecting heat, and when Ta is higher than the hot water temperature Tc in the hot water tank 1, the automatic three-way valve 11 is switched and the heat medium is transferred to the heat exchanger. After passing through 9, the heat medium further circulates through a heat exchanger 10, and when Ta is lower than Tc, the automatic three-way valve 11 returns to its original state, and the heat medium flows through a circulation path that passes only through the heat exchanger 10.

Further, the supplied water is preheated in the heat storage tank 2 by the heat exchanger 21, and then enters the hot water tank 1, where the high temperature portion is supplied with hot water through the hot water pipe 18.

According to the present invention, as described above, since the supplied water receives heat in the heat storage tank, there is always a considerable difference between the hot water temperature Tc in the hot water tank 1 and the temperature dust Tb of the stored water in the heat storage tank 2. The heat medium that has undergone heat exchange in the exchanger 9 can still heat the stored water, and the configuration is simple, and the solar heat utilization rate and heat collection efficiency are both improved.

[Brief explanation of drawings]

Figures 1 and 2 are schematic configuration diagrams illustrating a conventional example and an improved version of a hot water storage device using solar heat, respectively;
The figure is a schematic configuration diagram showing an embodiment of the solar heat hot water heating and storage device of the present invention. 1... Hot water tank, 2... Heat storage tank, 3, 4
, 6.14... Temperature detector, 5... Heat collector, 7... Heat collection pump, 8, 12.15...
...Differential temperature controller, 9,10...Heat exchanger, 11.13.16...Automatic three-way valve, 17...
...Water supply pipe, 18...Hot water pipe, 19.20
... Piping, 21 ... Heat exchanger for hot water supply.

Claims (1)

[Scope of utility model registration request] The automatic three-way valve connects the forced circulation path of the heat medium for solar heat collection through the heat exchanger for heat storage disposed in the heat storage tank with the flow path passing through the heat exchanger for hot water supply disposed in the hot water supply tank. It is connected upstream of the exchanger, and the water supply for hot water is sent to the hot water tank via a preheating heat exchanger installed in the heat storage tank, so that the temperature of the heat medium on the outlet side of the collector is When the temperature of the hot water in the hot water tank is higher, the heat medium is circulated through the side heat exchangers for hot water supply and heat storage, and when the temperature of the outlet side heat medium is lower than the hot water temperature in the hot water tank, the heat medium is circulated. A hot water storage device using solar heat, characterized in that the water is automatically switched to circulate only through the heat storage heat exchanger.