JPS5834728B2 - Air collecting solar house heating system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air concentrating solar heating system.

The amount of solar radiation generally changes over time as shown in Figure 1.

When the sun first rises in the morning, it gradually increases during the day, and then decreases again in the evening.

As described above, in the case of clear skies, solar energy exists from the beginning of the sun's rise to the time of sunset, although the amount of solar energy varies.

Therefore, it is desirable to be able to collect solar heat for as long as possible.

However, the temperature of the collected hot air in the hours of low solar radiation in the morning or evening, that is, the temperature of the air extracted from the solar heat collection, is at most a low temperature of about 25 to 30 degrees Celsius, which is not enough for heating. Haat'b will no longer be available.

Therefore, the purpose of this invention is to improve solar heat utilization efficiency by adjusting the damper opening according to the degree of solar radiation to control the amount of heat collecting hot air, and collecting heat at a high collecting air temperature for as long as possible. The purpose of the present invention is to provide an air-collection type solar harrass heating system.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a schematic diagram showing a heating system for an air heat collecting type solar house according to an embodiment of the present invention.

Pneumatic heat collector 1 installed on the roof of a solar house
The heated air is sent into a heat storage tank 4 by a blower 2 via a damper 3.

A thermistor 5 is attached near the air outlet side of the air type heat collector 1 as a temperature detector for detecting the surface temperature of the heat collecting plate.

The air leaving the heat storage tank 4 is sent back into the pneumatic heat collector 1 through the air inlet.

When heating the room, warm air is blown into the room from the blower or the heat storage tank 4 via the damper 7 by driving the blower 6, and is returned to the heat storage tank 4 from the return port 8.
Alternatively, it is returned to the air type heat collector 1.

Here, when the temperature of the hot air from the heat storage tank 4 or the blower 2 is low, an auxiliary heat source such as a heat pump or electric heater 9 is used.
The blower 10 is driven, and the auxiliary hot air is sent to the damper 11.
The air is sent into the room through the return port 8 and returned to the blower 10 again.

In the heating system having such a configuration, the thermistor 5 is connected to the blower 2 and the damper 3 in a control series as shown by dotted lines.

This will be explained with reference to FIG.

In FIG. 3, the damper 3 includes a cam 21. It is coupled with the motor 22 on the same shaft 23.

The connecting rod 24 is in contact with the surface of the cam 210, and the movable contact of the variable resistor 25 moves in accordance with the movement of the connecting rod 24.

Therefore, depending on the rotational position of the cam 210, that is, the opening degree of the damper 3, the voltage V, and the divided voltage Vs between
Furthermore, when the damper 3 is at its minimum opening, that is, when it is closed, a microswitch 27 is actuated by the notch of the cam 21, and the blower 2 is stopped.

A voltage Vt obtained by dividing a voltage between voltages (3) and (4) by a thermistor 5 and a resistor 28 is supplied to both input terminals of the differential amplifier 26.

Therefore, the output voltage island of the differential amplifier 26 is ■.

=(Vt-Vs).

However, A is the gain of the differential amplifier 26. Differential amplifier 26
■ Output voltage.

are the comparison voltages V, ,
Compared to V6.

Here, when setting V,>V, when vo>■, the voltage comparator 29 operates, and the forward motor control circuit 31
The motor 22 rotates in the damper closing direction with the output.

On the other hand, when vo<■6, the voltage comparator 30 operates and the motor 22 rotates in the damper closing direction by the output of the reverse side motor control circuit 32.

When <vo>5, there is no output from either of the comparators 29 and 30, and the motor 22 stops.

If V, , V6 is V,>O>V6, ■.

The damper 3 is opened and closed by the motor 22 so that the temperature becomes 01 (Vt), that is, 3 (Vt), and an arbitrary opening/closing angle according to the temperature detected by the thermistor 5 is maintained.

Now, this relationship will be generally explained using FIG. 4 as follows.

That is, the thermistor 5 provided in the air type heat collector 1 detects the heat collector plate surface temperature Ts near the outlet, and the opening degree φ of the damper 3 and the operation of the blower 2 are controlled according to this temperature Ts as follows. ing.

1) When Ts<Tc, ψ=O relationship (completely closed).

At this time, the blower 2 is turned off by the limit switch 27.
It becomes.

2) When Tc <Ta <To, φ increases monotonically as T3 increases (generally nonlinear monotonous increase).

At this time, the blower 2 is turned on.

3) When Ts≧To, cp = 100% (fully open)
.

At this time, the blower 2 is ON.

However, the lower set temperature at which the damper 3 is completely closed is Te1, for example, 40°C, and the upper set temperature at which the damper 3 is fully opened is To□, for example, 50°C.

According to this invention, the opening degree of the damper 3 changes as shown in FIG. 4 with respect to the surface temperature Ts of the heat collecting plate on the outlet side of the air type heat collector 1.

As a result, the amount of heated air that collects heat changes as shown in FIG. 5, and the temperature of the heated air that collects heat changes as shown in FIG. 6.

That is, the lowest heat collection temperature is obtained when the heat collection air volume is near 0, and the lower set temperature Tc (the temperature at which the damper 3 is completely closed)
The temperature will be approximately the same.

Here, the contact factor is about 100.

As explained above, according to the present invention, as shown by the broken line in FIG. 1, heat can be collected at a high heat collection temperature for a long time, so that the efficiency of utilizing solar heat is improved.

In addition, we used a thermistor to detect the surface temperature of the heat collecting plate on the outlet side of the air type heat collector, which changes sensitively to changes in the amount of solar radiation. The control response is quick, and even temporary fogging can be well controlled.

[Brief explanation of the drawing]

Fig. 1 is a graph showing an example of temporal changes in solar radiation, heat collection plate surface temperature, and heat collection temperature, Fig. 2 is a system diagram of a heating system according to an embodiment of the present invention, and Fig. 3 is the same. A circuit configuration diagram of the system. Figure 4 is a characteristic curve diagram showing the relationship between the opening degree of the damper for heat collection and the heat collection plate surface temperature. Figure 5 shows the relationship between the heat collection air volume and the heat collection plate surface temperature. Characteristic curve diagram, 6th
The figure is a characteristic curve diagram showing the relationship between the heat collection hot air temperature and the heat collection plate surface temperature. 1...Pneumatic heat collector, 2...Blower,
3... Damper, 5... Temperature detection thermistor, 22... Damper drive motor, 21
...Cam, 27...Sumitsuto switch.

Claims (1)

[Claims] 1. An air-type heat collector that heats flowing air using solar heat, and an air outlet of the air-type heat collector. A first ventilation path that guides air through a first tapper and a first blower and then to an air inlet of the pneumatic heat collector through a heat storage tank; A part of the air blown out from the first blower is selectively guided to the air inlet of the pneumatic heat collector via a second blower and a second damp/heated room. a second ventilation passage, a third ventilation passage connected in parallel to the heat storage tank and provided with a third blower, an auxiliary heat source, and a third damper therein; and the air exhaust of the pneumatic heat collector. It is characterized by comprising a temperature detector that detects the temperature of the heat collecting plate located near the outlet, and a damper control device that controls the opening degree of the first damper in accordance with the departure of the temperature detector. A solar house heating system with air heat collection.