JPS6355617B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a solar water heater in which hot water is stored by transferring energy obtained from a solar heat collector into a heat storage tank by operating a heat transfer device.

Conventional configuration and its problems In general, this type of solar water heater has a temperature sensor installed in the heat collector and the heat storage tank, and controls the start or stop of the heat collection operation based on the difference between the detected temperatures. Alternatively, a method is used in which an illuminance sensor is installed and heat collection is controlled depending on the presence or absence of solar radiation. However, according to these methods, in the case of temperature difference control, not only does heat collection operation start even for a small amount of heat collection, but also when the temperature of the heat storage tank decreases, the relative temperature difference is This resulted in extremely low efficiency operation. Additionally, devices equipped with an illuminance sensor start operation when there is sunlight, so they have the disadvantage of operating at low efficiency when sunlight is weak.

Purpose of the Invention This invention enables extremely highly efficient operation by recognizing the approximate season and performing control to perform heat collection operation mainly during the time when the maximum amount of solar radiation in that season can be obtained. The purpose is to provide solar water heaters.

Structure of the Invention The basic structure of the present invention includes a heat transfer device that connects a solar heat collector and a heat storage tank, a control device that has an illuminance sensor, an outside temperature sensor, and a preset delay timer, and a solar radiation sensor. By determining the season based on a combination of the air temperature sensor and the outside temperature sensor, and delaying the start of heat collection operation until the time when the maximum amount of solar radiation in that season can be obtained, it is possible to operate during the time when low efficiency operation is performed or This is intended to solve problems such as low efficiency operation due to a temperature difference due to a decrease in the temperature of the amount of heat storage.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention is shown in FIGS. 1 to 4. FIG. 1 shows the overall configuration of a solar water heater.
That is, the solar heat collected by the solar heat collector 1 is transferred to the heat exchanger 5 by the heat medium circulation pipes 2 and 3 and the pump 4, which are heat transfer devices, and heats the water in the heat storage tank 6. A solar radiation sensor 9 is located near the heat collector 1, and an outside temperature sensor 1 is located near the heat storage tank 6.
0 is placed. Further, a hot water temperature sensor 11 is disposed on the wall surface of the heat storage tank 6, and each of the sensors 9, 10, 11 is electrically connected to the heat collection control device 12. Pump 4 is also electrically connected to heat collection control device 12 . In addition, 7 is the water supply port, 8
is the hot water supply port.

2 and 3 show the configuration of the heat collection control device 12. FIG. FIG. 4 shows an example of solar irradiance at different times of the year. The illuminance sensor 9 senses sunlight at dawn, and at the same time, the outside temperature sensor 10 senses the outside temperature in the vicinity of the heat storage tank 6. The detection range of outside temperature is set in advance to a temperature that can distinguish between summer, middle season, and winter.
The seasonal signal circuit 14 generates signals of different levels, such as "medium" for the middle season and "low" for the winter season. The seasonal signal is sent to the operation control circuit 16 after a delay time preset by the timer circuit 15 according to the season has elapsed, and the pump relay 17 is driven. In other words, as shown in Figure 4, the time period from dawn to maximum solar irradiance, for example from 4 o'clock in summer
It starts operating after a delay time such as 6 hours at 10 o'clock, 4 hours from 5 o'clock to 9 o'clock in the middle season, and 1.5 hours from 6:30 to 8 o'clock in the winter. In addition,
The time set by the timer circuit 15 may be set in advance, or the setting may be changed arbitrarily. The operation control circuit 16 includes a hot water temperature sensor 11
is connected, and the pump relay 17 is de-energized when the water temperature reaches a preset temperature. Moreover, this hot water sound can also be changed arbitrarily. Moreover, this operation control circuit 16
In addition to the water temperature sensor 11, it is also controlled by signals from the illuminance sensor 9. That is, if there is no illuminance signal due to sunset, the pump relay 17 is de-energized regardless of the signal from the hot water temperature sensor 11. 13
is a DC power supply.

FIG. 3 shows a drive circuit for the pump 4, in which the pump 4 is connected in series to a normally open contact 18 of a pump relay 17 and is driven by an AC power source 19.

With this configuration, the season is recognized by the illuminance sensor 9 and the outside temperature sensor 10, and the preset delay time is delayed by the timer circuit 15 depending on the recognized season, so that the heat collection condition is the best for that season. The heat collection operation will be delayed until a favorable time is reached. This makes it the most efficient solar water heater.

In this embodiment, the classification of seasons to be identified is three, but it is not limited to three, and the same effect can be obtained by using a plurality of other classifications. Regarding the heat transfer device, in addition to the one explained in this embodiment, a device that uses latent heat transfer can obtain the same effect by controlling the heat pump with the normally open contact 18 of the pump relay 17. It is.

Effects of the Invention The solar water heater of the present invention has the advantage that heat collecting operation can be performed mainly during the time period when the maximum amount of solar radiation can be obtained depending on the season, and it can be operated with high efficiency.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the configuration of an embodiment of the present invention, Fig. 2 is a circuit diagram of its control circuit, Fig. 3 is a circuit diagram of its pump drive circuit, and Fig. 4 is an explanatory diagram of its operation. be. 1... Heat collector, 2, 3... Heat medium circulation pipe, 4
... Pump, 5 ... Heat exchanger, 6 ... Heat storage tank, 9
...Solar radiation sensor, 10...Outside temperature sensor, 11...
...Water temperature sensor, 12...Heat collection control device, 14...
Seasonal signal circuit, 15...timer circuit, 16...operation control circuit.

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 that recognizes the difference between day and night, an outside temperature sensor that detects outside temperature, and these solar radiation sensors and outside temperature. A solar water heater comprising: a control device that determines the season based on the output of a sensor and starts operation of the heat transfer device after a delay time preset according to the season after detecting dawn with the solar radiation sensor.