JPS6028913Y2 - solar water heater - Google Patents

Description

[Detailed description of the invention] This invention relates to a solar water heater equipped with a thermosiphon type heat pipe.

More specifically, this idea integrates a heat collection section consisting of heat collection plates and heat collection tubes with a hot water storage tank installed on the back side of the heat collection section via a heat exchanger, and creates a flat and compact outer box. This invention relates to a solar water heater that improves the appearance and heat retention of the hot water tank by being stored inside the tank, and has a structure that is suitable for handling such as transportation and installation of the product.

Conventionally, natural circulation type solar water heaters have been used, but this type of water heater has an evaporation section (heat collection section) and a condensation section (heat exchanger) for the heat medium (water, Freon, etc.). In order to form a thermosiphon between the two, as shown in FIG. 1, the hot water storage tank T had to be placed at the top of the heat collecting section C, which is installed at an angle.

However, in such an arrangement, the hot water tank T protrudes from the top surface of the heat collecting part C, or even if the entire water heater is made flat, it cannot be formed into a compact box shape, and it is difficult to stack it during transportation. They require a large space for installation, are laborious to handle because the center of gravity is biased to one side, and have the disadvantage that heat retention is poor due to the large amount of heat radiated from the hot water tank T, which has a large surface area facing the outside air.

This idea was developed in view of these circumstances, and by placing the hot water storage tank on the back side of the heat collection section consisting of the heat collection plate and the heat collection tubes of each heat pipe, the entire structure is completely rectangular, compact and flat. The present invention provides a solar water heater that can be formed into a box shape.

This invention will be explained in detail below based on the embodiments shown in the figures.

Note that this invention is not limited by this.

In FIGS. 2 to 4, the solar water heater 1 includes a heat collecting plate 2,
A heat collecting tube (evaporating section) 3.3' having the required surface area and integrally disposed on the back side thereof, and a heat exchanger (condensing section) 4.4 connected to both ends of the heat collecting tubes 3, 3'. ', a hot water storage tank 5 containing water that stores collected solar heat, an outer box 6 that houses these components, and an outer box 6 that is attached to the upper end surface and allows sunlight to pass through while radiating heat by convection with the outside air. It is mainly composed of a sunlight transmitting body 7 made of transparent glass or the like that prevents solar radiation.

The heat collecting plate 2 is usually rectangular as shown in Fig. 2, and the heat collecting pipes 3゜3' disposed on the back side of the heat collecting plate 2 are tightly attached to the heat collecting plate 2 by welding, caulking, or other means. It is designed to efficiently receive solar heat collected by the heat collecting plate 2.

A heat medium (water, Freon) is sealed in the heat collecting pipes 3, 3', and the condensed liquid of the heat medium in the heat exchangers 4, 4' is transferred to the heat collecting pipes 3, 3'. The condensate return pipes 3a and 3a' which return to one end of the heat pipe 3' constitute two independent heat pipes.

In order for the solar water heater 1 to efficiently collect sunlight, these heat pipes are installed on the roof or on a rooftop as shown in Figure 4, with a horizontal plane and an inclination (the inclination angle α is usually 15 to 30 degrees).
When installed, it creates a vertical relationship between the heat collecting part and the condensing part, enabling the operation of a siphon-type heat pipe,
Moreover, one heat exchanger 4' is arranged higher than the other heat exchanger 4.

When the solar water heater 1 is installed at an angle, the hot water tank 5 has a water inlet 8 connected to a water faucet (not shown) at the lowest point, and a water inlet 8 connected to a water faucet (not shown) at the highest point. A heating port 9 for taking out hot water is provided.
A heat insulating material 10 is attached around the entire area in order to reduce heat loss from hot water heated by solar heat.

After installing the solar water heater 1 having the above configuration on a roof or the like at a predetermined inclination angle as shown in FIG. The solar heat collected by the heat collecting plate 2 through the heat collecting plate 2 is transmitted through a plurality of sets of heat collecting pipes 3, 3' in this case, which are arranged on the back side of the heat collecting plate 2.
heat is transferred to

As a result, the heat medium in the heat collecting pipes 3, 3' is evaporated, and the evaporated gas moves upward in each heat pipe, and the heat exchanger 4, 4
' to exchange heat with the water in the hot water storage tank 5 and raise the temperature of the water.

The heat medium which releases the latent heat of vaporization and becomes a condensate in the heat exchangers 4 and 4' descends through the condensate return pipe 38t33' and is returned to the bottom of the heat collecting pipe 3°3', and the above-mentioned cycle is carried out. By repeating this process, the temperature of the water in the entire hot water tank 5 can be gradually and uniformly raised, and solar heat can be stored effectively.

Furthermore, the hot water tank 5 can be housed in the outer box 6 while being located below the heat collecting plate 2 and the two sets of heat pipes arranged on the back surface thereof, so that the solar water heater 1 has an overall shape. is small and flat rectangular, making it easy to stack.
Not only does it look better, it also requires less space for transportation and storage, and it is easier to install and generally handle.

Moreover, since the hot water storage tank 5 is housed in the outer box 6 and has a small contact area with the outside air, and the amount of heat radiated to the outside is small, the heat retention of the solar water heater 1 can be significantly improved.

Note that the number of heat pipes provided in one solar water heater is not particularly limited, but in consideration of compactness, it is usually preferably 2 to 3 heat pipes.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a conventional embodiment, Fig. 2 is a partially cutaway plan view showing an embodiment of this invention, Fig. 3 is a sectional side view of the same, and Fig. 4 is a sectional side view in the installed state. It is a diagram. 1... Solar water heater, 2... Heat collector plate,
3... Heat collection pipe, 4... Heat exchanger, 6...
...Outer box, 7...Solar light transmitter, body...
...Water supply port, 9...Warm supply port, 10...
・Heat insulation material.

Claims (1)

[Scope of Claim for Utility Model Registration] 1 A heat collecting tube is integrally arranged on a heat collecting plate, and both ends of the heat collecting tube are connected to a heat exchanger provided below the heat collecting plate to form a thermosiphon. A heat pipe is provided, and a heat exchanger is arranged in one hot water storage tank equipped with a water supply port and a hot water supply port, which are also provided below the heat collecting plate, and each of these components is housed in an outer box. A solar water heater that is characterized by: 2. The solar water heater according to claim 1, wherein the outer box has a solar light transmitting member in the upper opening. 3. The solar water heater according to claim 1 or 2, wherein the hot water storage tank has a peripheral wall wrapped in a heat insulating material.