JPS6044763A - Solar heat collector apparatus - Google Patents

Abstract

PURPOSE:To obviate an operation wherein heat is excessively collected, by interposing a by-pass valve between a heating medium inlet side and an outlet side header pipe, which by-pass valve is for sensing the temperature of a heating medium flowing through the system and will be opened when the temperature exceeds a prescribed temperature. CONSTITUTION:A thermostat type by-pass valve 14 is interposed between a heating medium inlet side header pipe 8 and an outlet side header pipe 9. In the usual heat collecting operation, the thermostat type by-pass valve 14 is closed, the heating medium pumped through a heating medium circulating line 5 is divided from the inlet side header pipe 8 into collector pipes 10, and after it has absorbed solar heat and its temperature has been elevated, the streams of the heating medium meet in the outlet side header pipe 9, through which the heating medium flows. When the temperature of the heating medium gets to or over a prescribed value, that temperature is sensed by a thermostat element 21 and the by-pass valve 14 is opened, so that the heating medium is flowed through the inlet side header pipe 8 directly into the outlet side header pipe 9 thereby decreasing the amount of solar heat absorbed by the collector apparatus. Accordingly, an operation where excessive heat is collected can be avoided, and the heating medium flowing through the heat exchanger is kept at safe operation temperatures at all times.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This invention comprises a module by combining a plurality of transparent tube type collectors, and connects the collectors to a heat medium circulation line to supply the heat medium in a forced circulation manner. The present invention relates to a solar heat collector device that collects solar heat by transmitting heat.

[Prior art and its problems]

First, FIG. 1 describes a hot water supply system using a solar collector, which is an object of the present invention. In the figure, 1 is a solar heat collector, 2 is a hot water storage tank with a built-in heat exchanger 3, and the collector 1 and the heat exchanger 3 are connected by a heat medium piping 5 via a heat medium circulation pump 4. It constitutes a medium circulation line.

The hot water storage tank 2 is also connected to a water supply pipe 6 and a hot water supply pipe 7 connected to the water supply. In the above system, if the heat medium in the system is pumped during sunshine hours and circulated between the collector 1 and the heat exchanger 3, the solar heat absorbed by the collector 1 can be transferred to the heat exchanger 3. It is well known that the water stored in the hot water tank 2 is supplied to the hot water tank 2 through the hot water storage tank 2 and turned into hot water by heating the water stored in the hot water tank 2.
This example shown in the figure is a combination of a transparent tube type collector tube in which a double heat collecting tube is enclosed in a vacuum glass tube.The collector 1 has an inlet header pipe 8 and an outlet header pipe 9.
and a plurality of collector pipes 10 connected in parallel across both header pipes. In addition, 11.
12 is an inlet vibrator and an outlet vibrator of the collector pipe 10; 13
It's a Helada cover. The collector tube 10 is constructed by housing a heat collecting tube 14 and a heat collecting plate 15 having a double pipe structure in a vacuum glass tube 16. In addition to the collector tube shown in the drawings, there is also known a collector tube in which a U-shaped heat collecting tube is housed together with a heat collecting plate in a vacuum glass tube.

By the way, the first model employing the collector device of the above conventional structure
With the hot water system shown in the figure, there are no problems under normal usage conditions, but if the amount of hot water supplied is extremely low during periods of high solar radiation such as summer, and the load is significantly reduced, the hot water storage The temperature of the hot water at No. 2 rises abnormally, and its thermal influence extends to the heat medium circulation line on the primary side of the heat exchanger 3, resulting in an overheat collecting operation state in which the heat medium also reaches an abnormally high temperature. Under such overheat-collecting operating conditions, the materials of the various rubber gaskets and hoses used as structural parts of the hot water storage tank deteriorate, and the insulation of the pump motor deteriorates, eventually leading to serious system failure. There is a risk of As a countermeasure to this problem, a method has been proposed in which the operation of the heat medium circulation pump is temporarily interrupted, but this method does not require the pump to be stopped and started frequently, resulting in a shortened motor life. This is not necessarily a good idea.

[Purpose of the invention]

This invention has been made in consideration of the above points, and its purpose is to provide a solar heat collector device that can avoid the above-mentioned excessive heat collecting operation without stopping the operation of the circulation pump. be.

[Key points of the invention]

In order to achieve the above object, the present invention has a valve between the inlet header pipe and the outlet header pipe of each module of a collector device that is normally closed, and the temperature of the heat medium flowing through the system. By inserting a bypass valve, which opens when the temperature of This is to avoid excessive heat collecting operation.

[Embodiments of the invention]

FIG. 3 shows an embodiment of the present invention, which differs from the conventional structure shown in FIG. An interposition is installed. This bypass valve 14 is a generally commercially available valve called a thermo-pressure valve, and its valve structure is as shown in FIG. That is, valve 14
is the valve inlet 15. A valve body 195- having a valve seat 18 biased by a spring 17 in a valve case 16 with an outlet 16 open, and integrally assembled with a valve body 19 to control opening and closing of the valve body 18 via an actuator shaft 20. The thermoelement 21 is made up of a thermoelement 21. The thermo-element 21 is filled with a liquid such as, for example, FES, and when the ambient temperature of the thermo-element 21 rises, the thermal expansion of the liquid causes the shaft 20 to be pushed up against the spring 17 via the piston 22. The valve body 18 is moved back from the valve seat to open the valve. Note that 23 is a pull ring for manual operation. In addition, the operating characteristics of this valve are as shown in Figure 6, when the ambient temperature exceeds the valve opening set value A, the valve begins to open, and thereafter, as the temperature rises, the valve opening increases. ing.

Returning again to FIG. 3, in the valve 14 having the above structure, the thermoelement 21 is inserted into the inlet side header pipe 8, and the valve inlet 15 and valve outlet 16 are connected to the header pipe 8, respectively.
The valve opening setting value of the valve 14 connected to the pipe end of the system shown in FIG. Then, a predetermined temperature is determined using the temperature of the heat medium flowing through the inlet side header pipe as a detected value.

Next, the operation of the above configuration will be described. During normal heat collection operation, the thermo-type bypass valve 14 is closed and the heat medium pumped through the heat medium circulation line 5 is diverted from the inlet side header pipe 8 to each collector pipe 10. , the hot water absorbs solar heat and rises in temperature, then merges in the outlet header pipe 9 and flows out. However, as described in Fig. 2, the hot water supply load becomes extremely small considering the high amount of solar radiation. When the temperature of the heating medium flowing into the inlet header pipe 8 rises above a predetermined value due to excessive heat collection, the thermoelement 21 senses this temperature and starts opening the bypass valve 14. As a result, the heat medium bypasses directly from the inlet header pipe 8 to the outlet header pipe 9 through the valve 14, thereby reducing the amount of solar heat absorbed by the collector device. The bypass flow rate in this case varies depending on the heating medium temperature, and the higher the heating medium temperature is, the more the valve opening degree increases and the amount of heating medium bypass increases. Therefore, in the hot water system shown in Figure 1, the amount of solar heat collected decreases and the amount of heat given to the hot water storage tank 2 decreases, and the temperature of the heating medium flowing through the circulation line also decreases, so that the temperature is balanced at a certain temperature below the allowable upper limit temperature. become. As a result, excessive heat collecting operation is avoided and the heat medium flowing through the heat exchanger 3 is always maintained at a safe operating temperature.

In a hot water supply system with a large trench capacity, generally a plurality of collector modules 1 are often used in combination as shown in FIG. In this case, as mentioned above, by equipping each module of the collector with a thermo-type bypass valve 14 and setting the valve opening setting value of each bypass valve appropriately, it is possible to The number of active collector devices is automatically increased or decreased according to the amount of solar radiation, making it possible to control operation to maintain a substantially constant heat medium temperature throughout the year.

Although FIG. 3 shows an embodiment applied to the double heat collecting tube type collector tube shown in FIG. 2, it goes without saying that the present invention can be similarly applied to a U-shaped heat collecting tube type collector tube. Also the third
In the illustrated embodiment, the thermoelement 21 is inserted into the inlet header pipe 8, but the thermoelement may be inserted and attached to the outlet header pipe 9. In this case, it is necessary to set the valve opening setting value higher than that in the embodiment shown in FIG.

〔Effect of the invention〕

As described above, according to the present invention, the temperature of the heating medium flowing in the system between the heating medium inlet side header pipe and the exit side header pipe is sensed for each module of the solar collector device, and the temperature is detected. By inserting a bypass valve that opens when the temperature exceeds a predetermined temperature, the heating medium sent by the pump can be bypassed if the temperature of the heating medium rises abnormally. By bypassing the heat through the valve, the amount of solar heat absorbed by the collector device can be reduced, and an effect of avoiding over-heat collecting operation can be obtained, which can greatly contribute to improving the reliability of the solar heat collecting system.

[Brief explanation of drawings]

Figure 1 is a basic system diagram of a solar water heating system, Figure 2 is a configuration diagram of a conventional solar collector device, Figure 3 is a configuration diagram of an embodiment of the present invention corresponding to Figure 2, and Figure 4 The figure is a block diagram of an applied embodiment of the present invention composed of a plurality of modules, and FIGS. 5 and 6 are a cross-sectional view of the structure and valve operation characteristics of the thermo-type bypass valve in FIG. 3. 1... Solar heat collector device, 4... Heat medium circulation pump, 5... Heat medium circulation line, 8...
...Inlet side header pipe, 9...Outlet side header pipe, 10...Collector pipe, 14...
... Thermo-type bypass valve, 19 ... Valve body,
21...Thermo element. 10-

Claims (1)

[Claims] 1) A solar heat collector device in which a module is constructed by connecting a plurality of solar heat collector tubes in parallel across an inlet side header pipe and an outlet side header pipe connected to a heat medium circulation line. In each module, a valve is normally closed between the inlet side header pipe and the outlet side header pipe, and when the temperature of the heat medium flowing in the system exceeds a predetermined temperature, the valve is opened to close the heat medium. A solar heat collector device according to claim 1, characterized in that a bypass valve is inserted that operates to directly bypass the inlet side header pipe to the outlet side header pipe. The valve is a thermo-type flow control valve in which the valve body and the thermo-element are integrally constructed, and the valve is equipped with a thermo-element that controls opening and closing of the valve by sensing the heat medium temperature, and the thermo-element is inserted into one of the header pipes. A solar collector device 0 in which the valve body 1 is connected astride between an inlet side header pipe and an outlet side header pipe.