JPH0635900B2 - Solar water heater - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar water heater for transporting energy obtained by a solar heat collector from the operation of a heat transport device into a heat storage tank to store hot water.

Configuration of Conventional Example and Problems Thereof In general, this type of solar water heater is provided with a temperature sensor in the heat collector and the heat storage tank, and the start or stop of the heat collection operation is controlled by the difference in the detected temperatures. In this method, a solar radiation sensor is provided and heat collection is controlled depending on the presence or absence of solar radiation. However, according to these methods, in the case of the differential temperature control, not only the heat collection operation is started for a small amount of heat collection, but also when the temperature of the heat storage tank is reduced, a relative temperature difference is generated. However, there is a problem in that extremely low efficiency operation is performed. In addition, in the case of the one equipped with a solar radiation sensor, the operation is started if there is solar radiation, so when the solar radiation is weak, low-efficiency operation is performed, and at the same time, the operation of the heat transfer device is started from early morning such as summer, and noise is generated. There was a problem that it would occur.

An object of the present invention is to eliminate the operation noise in the early summer and move the heat collecting operation time to a time zone in which the maximum amount of solar radiation is obtained, thereby enabling an extremely efficient operation. To do.

Configuration of the invention The basic configuration of the present invention is to integrate the insolation time of one day by the output of the insolation sensor, and according to the number of hours, the time from the start of insolation to the operation of the heat transfer device is calculated. By delaying for a preset time, this can solve problems such as operation noise in early summer and resistance operation in a time zone where the amount of solar radiation is small.

Description of Embodiments One embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the overall structure of the solar water heater. That is, the heat collected by the heat collector 1 is stored in the heat storage tank 4 by the heat transfer device 3 via the heat collection pipe 2. A solar radiation sensor 8 is provided near the heat collector 1, and a temperature sensor 9 is provided on the wall surface of the heat storage tank 4, both of which are connected to the control device 7 by electrical wiring. Further, the controller 7 and the heat transfer device 3 are also electrically connected.

In addition, 5 is a hot water supply tap and 6 is a water supply port.

2 and 3 show a circuit diagram of the control device 7, and FIG. 4 conceptually shows the difference between the insolation time and the amount of insolation which change depending on the season. As shown in Fig. 4, the difference between the insolation time in winter A and the insolation time in summer B is about 4
Since there is more time and the amount of solar radiation is more in summer B,
When the operation of the heat transfer device 3 is started only by the solar radiation sensor 8,
In summer B, the operation is started from early morning, and at the time when the amount of solar radiation reaches the maximum value at the same time when the operation noise is generated, sufficient heat is stored in the heat storage tank 4 and the operation of the heat transfer device 3 is stopped by the signal of the temperature sensor 9. Therefore, high efficiency operation may not be possible. Therefore, as shown in FIG. 2, the signal from the solar radiation sensor 8 is input to the integrating circuit 11, the solar radiation time is integrated, and there is no delay time of, for example, 10 hours or less depending on the integrated time.
When the time exceeds 10 hours, the delay circuit 12 is activated by a signal that delays 1 hour and exceeds 12 hours and delays 2 hours, and the operation signal is sent after the delay time that is predetermined from the solar radiation start time on the next day. And the display device 17 is operated at the same time. The temperature control circuit 13
Whether or not there is a heat request is judged by the signal of the temperature sensor 9, and if there is a heat request and there is an operation signal from the delay circuit 12, the coil 14 of the power relay is excited. When the heat transfer device 3 is operated, heat is stored in the heat storage tank 4, and when the temperature of the temperature adjusting circuit 13 reaches a temperature preset by the signal of the temperature sensor 9 or the solar radiation signal from the solar radiation sensor disappears, the coil of the power relay 14 is not excited.

FIG. 3 shows a circuit diagram of a drive circuit of the heat transfer device. The contact 15 of the power relay is the coil 1 of the power relay shown in FIG.
4 is closed by the excitation of 4 and the heat transfer device 3 is operated.
If the power relay coil 14 is de-energized, the contact 15
Is opened, and the heat transfer device 3 is stopped.

In addition, 10 is a DC power supply and 16 is an AC power supply.

Effect of the Invention The solar water heater of the present invention can delay the operation start time of the heat transfer device in accordance with the integrated solar radiation time on the previous day, so that it can be operated in comparison with the conventional method of operating from early morning in summer or the like. At the same time as reducing complaints due to noise, it is possible to shift the heat collection operation time to a time zone in which the maximum amount of solar radiation can be obtained in the summer, which enables extremely efficient operation. Further, it is possible to provide a more convenient solar water heater by notifying the display means during the operation of the delay timer.

[Brief description of drawings]

FIG. 1 is an explanatory view of the configuration of an embodiment of the present invention, FIG. 2 is a circuit diagram of its control device, FIG. 3 is a circuit diagram of a drive circuit of its heat transfer device, and FIG. 4 is its operation. FIG. 1 ... Heat collector, 4 ... Heat storage tank, 8 ... Solar radiation sensor.

Claims (1)

[Claims] 1. A heat collector, a heat storage tank connected to the heat collector via a heat transfer device, a solar radiation sensor for recognizing whether it is day or night, and a signal from the solar radiation sensor to indicate the solar radiation time of one day. An integrating circuit for integrating, and an operation start time of the heat transfer device according to the number of hours integrated by the integrating circuit, a start signal of a delay circuit which is delayed from an insolation start time, and a heat request signal of the heat storage tank for the power relay. A solar water heater comprising a control circuit having a temperature control circuit adapted to output an excitation signal.