JPS5917337B2 - solar heat collector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention connects a solar collector and a heat storage tank with piping, and a circulation pump is interposed in the piping, so that the heat heated in the collector by the operation of the pump is This invention relates to a solar heat collection device that stores hot water as a medium in a heat storage tank.

As shown in FIG. 1, such a conventional solar heat collecting device has a heat collector 1 and a heat storage tank 2 connected through a pipe 3, with a circulation pump 4 interposed in the pipe.

5 is a water supply pipe, and 6 is a hot water supply pipe.

The circulation pump 4 is started and stopped by a control device equipped with a high temperature side sensor 7 that detects the temperature of the heat medium (hereinafter referred to as water) on the heat collector 1 side and a low temperature side sensor 8 that detects the water temperature on the heat storage tank 5 side. 9
It is being held at

As shown in FIG. 2, in the control device 9, a bridge circuit 14 is formed between bus bars io and ii to which DC heavy duty is supplied, consisting of resistors 12 and 13, a high temperature side sensor 7, and a low temperature side sensor 8, and the output of the bridge circuit is Point A.

The input end of the RJJ amplifier 15 is connected to B, and the transistor 16 is controlled on and off according to the output voltage of the amplifier 15 to control the energization of the relay 17. By opening and closing the relay switch 18, the circulation pump is turned on and off. 4 is connected to and disconnected from an AC power source (not shown) to turn on and off.

Note that 19 is a feedback resistor for differential setting, and both sensors 7 and 8 are wire-wound sensors having positive temperature-resistance characteristics.

In this case, the temperature detected by the high temperature side sensor 7 is
When the temperature at point A becomes higher than the detected temperature by △T1 or more, the potential at point A becomes 1
When the potential at three points is exceeded, the amplifier 15 generates a high electronic output, turning on the transistor 16, and the relay 17 is energized to start the circulation pump 4.

At this time, positive feedback is applied via the feedback resistor 19 and the potential at point A is increased, so the circulation pump 4 stops because the temperature detected by the high temperature side sensor I is compared with the temperature detected by the low temperature side sensor 8 (△ This is when the temperature difference is smaller than T2 (△T2〈△Tl), and when the potential at point B or the potential at point A goes around once, the amplifier 15 generates a low current output and the transistor 16 turns off. Turn off the power to relay 17.

With this conventional device, when the outside temperature is high, such as during the summer, the water temperature in the heat collector 1 is heated by the outside air and cold water is replenished into the heat storage tank 2 by hot water supply, even at night when there is no sunlight. In some cases, a temperature difference of 1° or more occurred, causing the circulation pump 4 to operate.

In this case, the amount of heat collected is extremely small, and both sensors 1
, 8 becomes smaller than ΔT2, the circulation pump 4 stops, and this process will be repeated from now on.

As a result, electric power is wasted, the customer feels uncomfortable, and the life of the circulation pump may be shortened.

The present invention has been made in view of the above-mentioned facts, and includes a photodetection element that detects sunlight, a high-temperature side sensor that detects the heat medium temperature of the heat collector, and a low-temperature side sensor that detects the heat medium temperature of the heat storage tank. By providing a control device that starts the circulation pump by calculating the logical product of the detection value of the photodetection element being a certain value or more and the detection temperature difference of the rain sensor being more than a certain value.
To provide a solar heat collector capable of preventing unnecessary starting and stopping of a circulation pump in a state without sunlight such as at night.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

What is different in FIG. 3 from FIG. 2 is that the control device 9 can detect sunlight together with the high temperature side sensor 7 that detects the water temperature of the heat collector 1 and the low temperature side sensor 8 that detects the water temperature of the heat storage tank 2. A photodetecting element 20 such as CdS is provided at the position.

As shown in FIG. 4, the control device 9 includes a bridge circuit 14, an amplifier 15, and a feedback resistor 19 having the same configuration as in FIG. 11, an amplifier 25 is connected to the output point C2D of the bridge circuit 24, an AND circuit 26 is provided which inputs the output voltage of the amplifier 515.25, and a transistor is connected at the output of the AND circuit 26. 16
is turned on and off to control the energization of the relay 17, and the circulation pump 4 is started and stopped by opening and closing the relay switch 18.

27 is a feedback resistor for differential setting provided between the input and output of the amplifier 25.

When there is sunlight, the potential at point D decreases depending on the amount of light received by the photodetector 20, the potential at point C exceeds the potential at point D, and the amplifier 25 outputs a high voltage.

Therefore, when the water temperature of the heat collector 1 becomes higher than the water temperature of the heat storage tank 2 by ΔT1 or more, the IJ intensifier 15 emits a high voltage output, the AND circuit 26 emits a high voltage output, the transistor 16 turns on, and the relay 17 turns on. When the current is applied and the relay switch 18 is closed, the circulation pump 4 is started.

Then, when the temperature difference becomes smaller than △T2, the potential at point B becomes A
Since the potential at the point is doubled and the intensifier 15 outputs a low voltage, the AND circuit 26 no longer matches, outputs a low voltage, turns off the transistor 16, and stops the circulation pump 4.

In this way, when there is solar radiation, the hot water in the heat collector 1 is efficiently collected into the heat storage tank 2.

When there is no sunlight, such as at night, the amount of light received by the photodetecting element 20 falls below a certain value, the potential at point C becomes lower than the potential at point D, and the amplifier 25 outputs a low voltage.

Therefore, in summer, the water in the heat collector 1 is warmed by the outside air, and the hot water in the heat storage tank 2 is supplied with cold water, so that the temperature detected by the high temperature side sensor 7 changes from the temperature detected by the low temperature side sensor. △T from the detection temperature of sensor 8
Even if a temperature difference higher than 1 occurs, the AND circuit 26 will not reach a match, and the circulation pump 4 will be prevented from starting.

Therefore, the circulation pump 4 does not start or stop at night, causing discomfort to customers, and it is possible to save electricity, as well as
The life of the circulation pump 4 can be extended.

Note that the heat medium is not limited to water; antifreeze and various types of working fluids with excellent thermal conductivity can be used, and the photodetection element can be a solar cell or an indirect detection type temperature sensor in addition to CdS. Available for use.

As described above, the present invention provides a system in which a heat collector and a heat storage tank are communicated with each other through piping, and a circulation pump is inserted in the piping, and a photodetecting element that detects sunlight; A high-temperature side sensor detects the heat medium temperature of the heat storage tank, and a low-temperature side sensor detects the heat medium temperature of the heat storage tank. Since it is equipped with a control device that starts the circulation pump by taking a logical product, efficient heat collection operation can be carried out according to the temperature difference between the heat collector and the heat storage tank during the daytime when there is sunlight. By preventing the circulation pump from starting at night when there is no sunlight, it saves electricity, does not cause discomfort to customers, and does not shorten the life of the circulation pump.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a conventional solar heat collector, Fig. 2 is an electric circuit diagram of a conventional control device, Fig. 3 is a system diagram of a solar heat collector which is an embodiment of the present invention, and Fig. 4 is an electrical circuit diagram of the control device of FIG. 3; 1... Heat collector, 2... Heat storage tank, 3...
...Piping, 4...Circulation pump, 1...
・・High temperature side sensor, 8.1. ...low temperature side sensor, 9.
. . . Control device, 20 . . . Photodetection element.

Claims (1)

[Claims] 1 A heat collector and a heat storage tank are connected by piping, and a circulation pump is installed in the piping, and a photodetector element that detects sunlight and a high-temperature sensor that detects the temperature of the heat medium in the heat collector A circulation pump is equipped with a side sensor and a low temperature side sensor that detects the temperature of the heat medium in the heat storage tank. A solar heat collector equipped with a control device that starts the solar heat collector.