JPS608417B2 - solar heat collector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solar heat collecting device that reliably prevents freeze damage.

Solar thermal collectors are becoming popular as a means of obtaining clean and inexpensive energy.

A major problem with current solar heat collectors is countermeasures against freeze damage. The collectors of solar heat collectors are almost always installed at high places such as roofs or roof tops, and repairs are particularly complicated on the sloped roofs of ordinary homes, and expensive collectors may need to be replaced. Have difficulty. In addition, since solar heat collectors have a large surface area to increase the amount of heat collected, heat is radiated through the air, so even if the temperature is quite high, for example around 4 degrees Celsius, the collector will not freeze. There were many cases where the heat collector or the surrounding piping was damaged due to freeze failure.

According to the inventor's experiments, when a heat collector equipped with a stopper freezes, the internal pressure rises to 15k9/arc (gauge pressure). There are three main types of methods for preventing freeze-breakage of subordinate vessels.

The forced circulation method, which prevents freezing by circulating hot water from the heat storage tank when the surface temperature of the collector approaches 0°C, naturally causes a large loss of collected solar heat, and can be clogged with debris or foreign matter, or in the event of a power outage. had the disadvantage of not being able to circulate hot water. The method using an electric heating coil naturally involves a loss of electrical energy, and furthermore, the wiring to the heat collector etc. is complicated and has the disadvantage of requiring a large amount of cost.

Next, there is a method of draining the water inside the heat collector to prevent freeze damage, but it is necessary to drain the water smoothly and to discharge the air inside the pipes smoothly during operation, to prevent corrosion of the pipes during draining. must be taken into consideration. The inventor of the present invention has discovered that even if there is a power outage or a blockage with dirt or foreign matter, it is possible to reliably prevent freezing and destruction of the heat collector, etc., and that a pressure release valve is provided to release the high pressure that occurs when freezing occurs, and that the pressure release valve is provided. As a result of extensive research into a structure that prevents freeze damage by installing the valve near the heat storage tank and eliminating the need to perform emergency measures and operate the pressure release valve at high places, we have completed the solar heat collecting device of the present invention. An example of the present invention will be described in detail below.

The heat collector 1 is constructed by assembling a plurality of panels la and lb, and receives sunlight and heats the heat medium flowing within the panels la and lb.

Water is often used for hot soot. Heat collection panel stove a?
Tortoise b has header pipes 2 at the upper and lower ends, respectively;
A large number of heat collecting pipes 4, 4, . . . which connect the header pipes 2 and 3 are provided. The header of each heat collecting panel la and b is extended outward to provide four protruding pipes 5 and 8, and the protruding pipes 5 and 5 are connected to form a heat collector. has been done.

A circulation outgoing pipe 6 is connected to the protruding lower left outside of the heat collector i, and a shield return pipe 7 is connected to the protruding pipe 5 on the upper right outside of the heat collector. An exhaust valve cap and a vacuum release valve 9 are provided at the connection portion between the circulation return pipe 7 and the protrusion pipe 5. The exhaust valve is used to discharge air trapped in the heat collector 1, and the vacuum release valve 9 is used to suck air when discharging water from the heat collector 1. The remaining protruding pipe 5 is equipped with a t-rubber plug 8. This prevents the heat collector 1 from being dislodged from the protruding pipe 5 due to the high water pressure inside the heat collector 1, and from breaking the heat collector 1. The other ends of the circulation outgoing pipe 6 and the shield ring returning pipe 7 are connected to the heat storage tank turtle 1. In the simplest example, a single hot water tank is installed inside the heat storage tank, and the overflow tank, circulation outgoing pipe 6, and circulation returning pipe 7 are closed, and the "water supply pipe 1" is closed.
2. The supply tube turtle 3 is closed. That is, water supplied from the water supply pipe 12 is directly circulated to the heat collector turtle. Heat collector i
The circulating heat medium may be made to flow through a heat exchanger provided in the hot water tank in the heat storage tank 11 so as to prevent the hot water supplied for hot water supply from coming into contact with the hot water circulating in the heat storage tank 11.

The circulation outward pipe 6 and the circulation return pipe 7 each have an on-off valve 1.
4, 15 are provided.

Since the opening/closing valves 14 and i6 can be easily operated, they are provided in a location close to the heat storage tank Kamigawa. A check valve blade 6 is provided between the on-off valve 14 and the heat storage tank 11. A pressure release valve group 7 is provided close to the on-off valve 14 between the on-off valve 14 and the heat collector blade. The pressure release valve 1
7. When a rise in water pressure is sensed, the preferential destruction part, such as the thin metal plate 18, is destroyed or automatically partially closed to release the water inside.

In the solar heat collecting device of the present invention, when L solar heat cannot be collected, circulation of hot soot is stopped, and when the temperature is still low, freezing starts from inside the heat collector 1 due to aerial radiation. Since circulation of hot soot is stopped, internal pressure increases due to volume expansion due to freezing. The pressure release valve 17 operates to release the internal pressure even if it senses an increase in the internal pressure.

In the illustrated example, the thin metal plate 18 is broken and the hot soot in the circulation outgoing pipe 6 is released. Pressure release valve 17 with damaged thin metal plate 18
Since the heat collector is open, the water in the heat storage tank 31 will continue to be discharged, so manually or automatically close the on-off valves 14 and 15. Later, replace the pressure release valve 1 hole and replace the metal plate 18 again. Used to prevent freeze damage. Therefore, to on-off valve 1
The blade S and pressure release valve 19 are installed in a low place close to the heat storage tank 1 to make it easier to open and close them and to replace parts.
Stand up the device. The blind amount Q acts as a safety device to prevent the heat collector 1 from being frozen and destroyed even in the event of an accident such as clogging of the circulation pipe 6.
The pressure release valve is installed so that it comes off from the protruding tube 5 when a pressure higher than the operating pressure of the neck is detected. If the pressure release valve turtle 7 does not operate due to some accident when the public water collector 0,1Q' is frozen, it will sense the increased internal pressure and come off the protruding pipe S to discharge hot soot.
This ultimately prevents freeze damage of the heat collector i. Pressure release valve? Circulation outbound pipe 6, etc. is a heat collector to ensure proper operation! It is preferable to insulate the circulation outbound pipe 6 to the circulation return pipe 7, government stopper 18, TomiQ, etc. with heat insulating materials to prevent them from freezing and sealing.According to confirmation tests conducted by the inventor. , copper 0 on the pressure relief valve 17.

By using a thin metal plate 18 with a thickness of 0.5 mm, the pressure relief valve 17 can be operated with a 2 to 5 k9/c rudder, and the IQ can be made lower than the operating pressure of the pressure relief valve 17. It was made so that it could come off from the protruding tube 5 at a high 3~7k9/m.
It was confirmed that the solar heat collecting device of the present invention can effectively prevent freeze damage.

Since the solar heat collector of the present invention has the configuration as described above,
Even if there is a power outage or foreign matter is clogged, the effect of preventing freezing and destruction of the heat collector can be reliably obtained.Moreover, the pressure release valve and its attached open/close valve are installed close to the heat storage tank, making it easy to take emergency measures in the event of freezing. ``Work such as parts replacement and inspection can be done at low places.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing an example of the solar heat collecting device of the present invention, FIG. 2 is a perspective view showing an example of the heat collector, and FIG. 3 is a sectional view showing an example of a pressure release valve. 1... Heat collector, 2, 3... Header pipe, 4...
... Heat collector, 5 ... Protruding pipe, 6 ... Circulation outgoing pipe,
7... Circulation return pipe, 8... Exhaust valve, 9... Vacuum release valve, I8... Effective plug, 11... Heat storage tank, 12...
...Water supply pipe, 13...Moat supply pipe, 14,15...
...Opening/closing valve, 16...Check valve, 17...
・...Pressure release valve, 18... Thin metal plate. Shigeru 1 Zu Nuka 2 Koji vertical 3 machines

Claims (1)

[Scope of Claims] 1. The heat collector and the heat storage tank are connected by a circulating outgoing pipe and a circulating returning pipe, and an on-off valve is provided in each of the circulating outgoing pipe and the circulating returning pipe, and the on-off valve and the heat collecting tank are connected in the circulating outgoing pipe. 1. A solar heat collecting device characterized in that a pressure release valve is provided between the solar heat collecting device and the container. 2. The heat collector and the heat storage tank are connected by an outgoing circulation pipe and a returning circulation pipe, and each of the outgoing circulation pipe and the returning circulation pipe is provided with an on-off valve, and the pressure is maintained between the on-off valve and the heat collector in the outgoing circulation pipe. A release valve is provided, a protruding pipe is provided from the heat collector, and a blind stopper that comes off at a pressure slightly higher than the operating pressure of the pressure release valve is attached to the end of the protruding pipe. solar heat collector.