CN201081443Y - A split type solar water heater - Google Patents

Abstract

The utility model can solve the problem that a heat pipe split type solar water heater has higher cost and bigger heat transferring loss, and comprises a water tank and a heat pipe, the heat pipe comprises a split type condensation section and an evaporation section, a fin pipe in a heat collector is the evaporation section of the heat pipe, a connecting pipe is the condensation section and a transition section of the heat pipe, the condensation section is extended into a water tank, the evaporation section and the condensation section are communicated with each other through a three-way stop valve.

Description

A split type solar water heater

technical field

The utility model relates to a split solar water heater.

Background technique

At present, in order to realize the combination of solar water heaters and buildings, split-type solar water heaters are generally used in which the water tank and the heat collector are set separately. Keep the tank indoors. In this way, the beauty of the building will not be affected. But in order to transfer the heat obtained by the collector to the water tank, there are generally three ways. One is to use a water pump to carry out forced circulation between the heat collector and the water tank, and send the heat of the heat collector into the water tank in time. Due to the addition of water pumps and components such as expansion tanks, safety valves, and control instruments, this method has a relatively high cost. Another method is to adopt the method of natural circulation, taking advantage of the characteristics of low density of hot water and high density of cold water, and using two connecting pipes to connect the heat collector and the water tank for natural circulation heat exchange. Because the power of natural circulation is small, the flow resistance of the connecting pipe is large, and the heat dissipation is large, so the heat transfer effect is very poor.

The third way is to connect the water tank and the heat collector by connecting the heat pipe. The condensing section connected with the heat pipe extends into the water tank, and the evaporating section extends into the heat collector. A heat pipe is arranged in each heat collecting tube in the heat collector, and the condensation section of these heat pipes is connected with the evaporation section connected with the heat pipe. We know that the heat pipe includes an evaporating section and a condensing section, which are formed by first pumping out the air inside and injecting a certain amount of working fluid, and then sealing the tube shell. When it works, the external heat is introduced from the evaporating section, so that the working medium in the evaporating section absorbs heat and evaporates into steam, which flows to the condensing section, and condenses in the condensing section, releasing the latent heat of vaporization, which is transmitted out of the tube. The liquid working fluid condensed in the condensation section flows back to the evaporation section. The cycle continues like this, constantly transferring heat from one end of the heat pipe to the other. Through the heat pipe, the solar heat energy obtained in the heat collecting pipe is transferred to the evaporation section of the heat pipe, and then the obtained heat energy is transferred to the water tank by the heat pipe. This way is less costly than the first way, and the heat transfer effect is much better than the second way. However, this method also has defects, because more heat pipes are used, so the cost is still higher. In addition, heat is transferred to the connecting heat pipe through the heat pipe in the heat collecting pipe, and there will still be heat transfer loss in the middle.

Contents of the invention

The technical problem solved by the utility model is that the cost of the split type solar water heater using the heat pipe is relatively high and the heat transfer loss is relatively large.

A split-type solar water heater includes a water tank and a heat pipe. The heat pipe includes a condensing section and an evaporating section in a separate form. The condensing section extends into the water tank. The evaporating section and the condensing section are connected through a three-way stop valve. The finned tube in the heat collector is the evaporation section of the heat pipe, and the connecting pipe is the condensation section and transition section of the heat pipe. When leaving the factory, the evaporation section of the heat pipe is evacuated through the three-way stop valve and filled with working fluid. In this way, the heat collector, connecting pipe and water tank can be packaged separately for easy transportation. When installing, it is necessary to connect the connecting pipe to the three-way stop valve first, then use a vacuum pump to pump out the air in the condensation section through the process port on the three-way stop valve, and then unscrew the screw in the three-way stop valve to make the three-way stop valve The shut-off valve is opened to connect the condensing section of the heat pipe with the evaporating section. The three-way stop valve belongs to the prior art, and its structure and principle are exactly the same as the three-way stop valve used on the split air conditioner.

As a further improvement, the evaporating sections of the multiple heat pipes are connected in parallel and communicate with the three-way stop valve, and fins (called finned tubes) are connected to the outer surfaces of the evaporating sections of the heat pipes. Multiple finned tubes can work simultaneously to absorb heat; fins can increase the heat absorption area. The surface of the fins is coated with a selective absorbing coating.

The plurality of finned tubes mentioned above can be arranged in a rectangular box whose upper surface is made of transparent material. The rectangular box is easy to integrate with buildings such as roofs, balconies, and exterior walls, and the appearance is neat and beautiful.

For any of the above split solar water heaters, the transition section of the connecting pipe includes a corrugated pipe. The bellows are easy to bend, making it easier to install through walls.

When the evaporation section of the heat pipe is placed vertically, the working fluid in the evaporation section may accumulate in the lower part of the evaporation section due to gravity, causing some evaporation sections to have no liquid working fluid and affect the heat transfer effect. The inner wall of the section is provided with a liquid-absorbing core, because the liquid-absorbing core can absorb the liquid working medium, so that the entire evaporation section can be guaranteed to have liquid working medium. When the evaporating section of the heat pipe is placed horizontally or obliquely, there will be no phenomenon that part of the evaporating section may have no liquid working fluid, so there is no need to set a liquid-absorbing wick.

Description of drawings

Fig. 1 is a front view of an embodiment.

Detailed ways

In the split type solar water heater shown in Fig. 1 , the top of the water tank 1 has a water outlet 7, and the bottom has a water inlet 9.

The upper parts of multiple finned tubes 2 are connected in parallel and connected with the upper connecting pipe 3 , and the upper connecting pipe 3 communicates with the three-way stop valve 4 . The lower parts of the plurality of finned tubes 2 are connected in parallel and connected to the lower connecting pipe 5 , and the lower connecting pipe 5 communicates with the upper connecting pipe 3 through a vertical pipe 6 . Finned tubes 2, upper connecting tubes 3, lower connecting tubes 5, and vertical tubes 6 are all arranged in a rectangular box body 8. There is an insulating layer around and below the rectangular box body 8, and a transparent glass cover plate (not shown) is arranged on the upper surface. . The heat collector 15 includes: a plurality of finned tubes 2 , an upper connecting tube 3 , a lower connecting tube 5 , a vertical tube 6 and a rectangular box 8 .

The finned tube is exactly the evaporating section of the heat pipe, and its outer surface is connected with fins 11 . The surface of the fins is coated with a selective absorbing coating. A liquid-absorbing core 10 is arranged in the evaporation section. The part where the connecting pipe 12 stretches into the water tank is exactly the condensing section of the heat pipe, and the part outside the water tank is exactly the transition section. The connecting pipe 12 stretches into the water tank 1 and is threadedly sealed with the bottom of the water tank. The transition section of the connecting pipe 12 includes a bendable corrugated pipe 13 , and the connecting pipe 12 communicates with the heat collector 15 through the three-way stop valve 4 . The transition section of the connecting pipe 12 is covered with a thermal insulation cover 14 .

Sunlight shines on the finned tube through the transparent glass cover plate, and the liquid working medium absorbed by the liquid-absorbing core in the finned tube evaporates after being heated, and condenses into a liquid through the upper connecting pipe, the three-way stop valve, and the condensation section from the connecting pipe to the connecting pipe. After condensing, the liquid working medium goes along the connecting pipe, the vertical pipe to the lower connecting pipe. Such continuous circulation heats the water in the water tank.

The water heater has no components such as a water pump, an expansion tank, and a controller, and the cost is low; the heat obtained by the collector is directly transferred to the water tank by a heat pipe, and the thermal efficiency is high; it is not afraid of air drying, and has high reliability; it is easy to maintain.

Claims (8)

1. A split-type solar water heater, comprising a water tank and a heat pipe, is characterized in that: the heat pipe comprises a condensing section and an evaporating section of a component type, and the condensing section stretches into the water tank, and the evaporating section and the condensing section are connected by a three-way stop valve. 2. The split solar water heater according to claim 1, characterized in that: a plurality of evaporating sections are connected in parallel and communicate with the three-way stop valve. 3. The split solar water heater according to claim 2, characterized in that fins are connected to the outer surface of the evaporating section, and a selective absorption coating is coated on the surface of the fins. 4. The split-type solar water heater according to claim 2, characterized in that: the plurality of evaporation sections are arranged in a rectangular box whose upper surface is made of transparent material. 5. The split-type solar water heater according to claim 4, characterized in that: the upper parts of the plurality of evaporation sections are connected in parallel, connected to an upper connecting pipe provided in the box body, and the upper connecting pipe communicates with a three-way stop valve. 6. The split-type solar water heater according to claim 4, characterized in that: the lower parts of the plurality of evaporation sections are connected to the lower connecting pipe provided in the box body, and the lower connecting pipe communicates with the upper connecting pipe. 7. The split-type solar water heater according to claim 5 or 6, characterized in that a liquid-absorbing core is arranged in the evaporation section. 8. The split solar water heater according to claim 1, 2, 3 or 4, characterized in that: the transition section of the connecting pipe includes a bendable corrugated pipe.

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