JP3018149U - Solar water heater using solar heat - Google Patents

Abstract

(57) [Summary] [Purpose] In a solar water heater, heat is supplied to a hot water storage tank through a heat medium liquid in fine weather, and when there is a shortage of solar heat sources such as in cloudy weather or rainy weather, electric heating P. T. A C-plane heating element is used, and a backup heat source is supplied by the control device of the solar heat sensor. [Structure] A heat collecting mechanism and P. T. This is a configuration in which a C-plane heating element is provided in a watertight or surrounding area and a hot water storage tank incorporating a heat exchanger for collecting heat of the heat collecting element, a solar heat sensor, and a control device are combined.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a solar water heater for the purpose of energy saving and the like, which supplements electric power to a solar water heater using solar heat to back up the heat shortage during nighttime, cloudy weather, and rainfall.

[0002]

[Prior art]

 In the conventional technology, the heat shortage is usually supplied by burning oil and gas boilers when hot water is used.

[0003]

[Problems to be solved by the device]

 It is said that about 40% of the year is rainy and cloudy weather where solar heat cannot be used. Supplying hot water throughout the year requires a considerable amount of oil and gas boilers or electric heat, which requires a large cost. Met.

[0004]

[Means for Solving the Problems]

 In the present invention, the heat shortage is reduced to P. T. C. A planar heating element having a self-temperature control characteristic is used to supplement with electric power, and a sensor for detecting solar rays is used to effectively use the electric power.

[0005]

[Work]

 P. T. C, that is, the sheet heating element having the self-temperature control characteristic does not increase in temperature above the maximum temperature of about 70 ° C, and when the temperature rises up to about 70 ° C, the electric resistance becomes ten times or more. It has the property of increasing in power consumption and decreasing to one tenth of the power consumption (electric resistance increases as the temperature of the atmosphere decreases).

Therefore, a thermostat for temperature control is not necessary, and when the water temperature rises to 70 ° C. to 90 ° C. due to solar heat, the power consumption becomes almost zero even if the heating element is energized.

However, it is economically disadvantageous to energize the heater when it is expected that a sufficient amount of heat will be obtained by sunlight during the day. In this case, energization of the heater should be stopped. Therefore, the sensor that detects the sun's rays will stop energizing the heater.

That is, when the amount of heat supplied by the sun's rays is insufficient in cloudy weather or rainy weather, a switch for supplying power to the planar heating element is operated by a sensor that detects the sun's rays to energize it, and vice versa. If the amount of heat supplied by the light beam is sufficient, stop energizing.

[0009]

【Example】

 The details of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing the whole of a solar water heater using solar heat according to the present invention. The heat collector (1) on the roof, a medium liquid tank (2), a medium liquid circulation pipe (4), A group equipped with a solar heat sensor (3), a hot water storage tank (8) installed indoors or outdoors and having a planar heating element electric heater (9) attached inside or outside, and a heat exchange pipe for medium liquid (14) ), A pump (7) for circulating the medium liquid, and a group of control panels (6) having a control mechanism such as a temperature sensor and a timer built therein.

The inside of the heat collector is filled with a special medium liquid having a boiling point of 180 ° C. to 190 ° C. and a freezing temperature of about -30 ° C., and a liquid tank (2) for adjusting thermal expansion due to temperature rise and fall is provided. An electric pump (7) is used to circulate the heat exchange pipe (14) in the hot water storage tank (8), and the medium liquid warmed by the heat collector warms the hot water storage tank.

The hot water storage tank has a P. T. A power plane heating element (9) having C characteristics is built in (9 ') or attached to the outer periphery (9), and the outside is kept warm by using an appropriate heat insulating material (16).

The solar heat sensor (3) determines the presence or absence of effective solar heat, and the control device (6) receives a signal from the solar heat sensor (3) and supplies power to the planar heating element (9). To do.

FIG. 2 shows a circuit that uses the solar cell (3) as a solar heat sensor, operates the switch (B), and supplies power to the planar heating element (9). The solar cell (3) uses the change in voltage because the voltage becomes high in fine weather and decreases in cloudy weather.

FIG. 3 shows that the switch (B) is operated by using CdS (C) as a solar heat sensor. Since CdS (C) has a low voltage in fine weather and a high voltage in cloudy weather, this change in resistance is used.

A thermistor (E) may be used as a solar heat sensor instead of CdS. When using the thermistor, as shown in Fig. 4, the thermistor (E) is closely attached to the black endothermic plate (F), and the periphery is surrounded by the heat insulating material (D), especially from the sun rays (G). It is particularly effective as a solar heat sensor if it can absorb heat easily.

[0017]

[Effect of device]

 The solar water heater utilizing solar heat according to the present invention is capable of fully utilizing the heat generated by the sun's rays, and when the heat generated by the sun's rays is small, P. T. Since it uses a planar heating element with C-characteristics and a maximum temperature of about 70 ° C, when the water temperature of about 70 ° C, which is necessary for a solar water heater, becomes the minimum power consumption automatically, it is more economical. It produces many effects as a heat source, and naturally supplies hot water even on days with insufficient solar heat, which accounts for 40% annually due to rain and cloudy weather, and users can easily use hot water for 365 days.

[Brief description of drawings]

FIG. 1 is an overall layout of a solar water heater using solar heat.

FIG. 2 is a circuit diagram showing a solar heat sensor and control measures.

FIG. 3 is a circuit diagram showing a solar heat sensor and control measures.

FIG. 4 is a sectional view showing a solar heat sensor.

[Explanation of symbols]

 1 heat collector 2 medium liquid tank 3 solar cell (solar heat sensor) 4 medium liquid circulation pipe 5 sensor line 6 control panel 7 medium liquid circulation pump 8 hot water storage tank 9 affixed around planar heating element tank 9'inside planar heating element tank Location diagram for installation 10 Hot water pipe 11 Tap water pipe 12 Commercial power supply 13 Power input cable 14 Heat exchange pipe 15 Pressure adjustment valve 16 Hot water storage tank insulation B Switch C Cds D Insulation material E Thermistor F Heat absorption board G Solar rays

Claims (2)

[Scope of utility model registration request] 1. A heat source for collecting heat using a medium liquid as a heat medium of a heat collecting body of a solar water heater and circulating the heat medium with a heat exchanger provided in a hot water storage tank by a power pump; P. inside or outside T. C (Positive
(Temperature Coefficient)
A solar water heater that uses solar heat and has a heat source that has a characteristic electric power heating element and that supplements the heat shortage in rainy or cloudy weather. 2. A solar water heater using solar heat according to claim 1, further comprising a solar heat sensor and a control panel for using solar heat in fine weather and electric heat of an electric power plane heating element in rainy or cloudy weather.