JPS5811548B2 - solar water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a natural circulation type solar water heater, more specifically to a solar water heater that can be placed directly on the roof. Our objective is to provide a solar water heater that has excellent heat receiving efficiency when tilted, can absorb a large amount of solar heat with a small heat receiving area, and can be made compact as a whole. This is to prevent the hot water in the hot water storage tank from radiating heat due to reverse circulation of hot water between the tanks, that is, cooling of the heat collection panel.

As shown in Figures 1 and 2, in conventional roof-mounted solar water heaters, in order to increase the solar heat receiving area, the heat collection panel A must be made large, or the front side of the hot water storage tank B must be A reflector C is installed at the front of the hot water storage tank B, and the solar heat reflected by the reflector C is incident on the heat collection panel A placed in front of the hot water tank B. If you try to collect solar heat, the area required for the heat collection panel will be extremely large, which is a disadvantage. There is a drawback that the reflected heat may not be incident on the heat collection panel A, or even if it is incident, the incident angle α is too large and the reflectance of the transparent plate covering the surface of the heat collection panel A will be large and the transmittance will be reduced. Ta.

The present invention has been made in view of the above points, and will be described in detail below based on embodiments shown in the drawings.

The hot water storage tank 1 is formed to have a substantially circular cross section, and a hot water inlet 2 is provided at the upper end of the outer surface of the large diameter portion 1a on one half, and the tip of the tapered portion 1b on the other half is connected to the large diameter portion 1a. A branch pipe 3 is located at the same level as the lower end, and integrally extends upward from the tip of the tapered portion 1b, forming a water outlet 4 at the upper end of the branch pipe 3. The supply port 5 is connected to a distern 6 disposed above the hot water tank 1, and cold water such as tap water is supplied from the distern 6 to the hot water tank 1.

The first heat collecting panel 10 is formed into a flat shape with a hollow interior, and the interior is divided into multiple rows of water channels 12 by a plurality of vertical walls 11 except for both front and rear ends. A first hot water outlet 13 is formed, and a water supply pipe 14 whose lower end communicates with the front end of the first heat collecting panel 10 is arranged parallel to the first heat collecting panel 10 on the other side.

The first heat collecting panel 10 formed in this manner has the first hot water outlet 13 connected to the hot water pipe 7 inserted into the upper part of the hot water storage tank 1 at its upper end via the connecting pipe 15, and the upper end of the water supply pipe 14 It is connected to the water supply port 38 at the bottom of the hot water storage tank 1 by a connecting pipe 16, and the cold water at the bottom of the hot water storage tank 1 passes through the water supply pipe 14 to the first heat collection panel 10, where it is heated by receiving solar heat. , through each water channel 12, becomes hot water from the first hot water outlet 13, and returns to the upper part of the hot water tank 1, repeating the natural circulation to increase the water temperature in the hot water tank 1.

Similarly to the first heat collecting panel 10, the second heat collecting panel 20 also has a vertical wall 21 that divides the inside into a plurality of rows of water channels 22, and a second hot water outlet 23 is formed at the upper end of the side. The other side is integrally molded with a riser pipe 24 whose lower end communicates with the lower end of the second heat collecting panel 20 and rises upward.

A water flow population 25 is provided at the upper end of the riser pipe 24 and is at the same level as the second hot water outlet 23.
And the second hot water outlet 23 is connected to the hot water inlet 2 of the hot water storage tank 1 and the water outlet 4 of the branch pipe 3 via the connecting pipe 2627, respectively, to circulate between the second heat collection panel 20 and the hot water storage tank 1. form a road.

This second heat collecting panel 20 is connected to the hot water tank 1 as shown in FIG.
It is placed upright in front of the hot water storage tank 1 at an appropriate angle with the first heat collection panel 10 placed in front of the hot water storage tank 1, and is housed in the housing 30 together with the hot water storage tank 1. 20 is irradiated with solar heat, the cold water sent from the bottom of the hot water storage tank 1 through the branch pipes 3 and riser pipes 24 into the second heat collection panel 20 undergoes heat exchange, ascends each water channel 22, and flows into the second heat collection panel 20. The hot water is sent to the upper part of the hot water storage tank 1 from the hot water outlet 23, and the hot water is stored in the upper part of the hot water storage tank 1, and the cold water at the bottom is sent to the second heat collection panel 2.
High temperature hot water is stored in the hot water storage tank 1 by repeating natural circulation such as sending it out to 0. If the irradiation of solar heat to the second heat collecting panel 20 is interrupted after sunset, etc., the second heat collecting panel 20 The water stored in the internal waterway 22 is cooled at the same time as the water in the riser pipe 24, and the specific gravity of both becomes equal, so it is possible to prevent reverse circulation with the hot water tank 1, This prevents the water temperature from dropping due to heat exchange with the outside air.

As described above, in the present invention, the second heat collecting panel 20 is erected in front of the hot water tank 1 and is tilted at an appropriate angle with respect to the first heat collecting panel 10 placed on the roof. Therefore, when placed directly on the gentle roof surface 31, even if the sun is tilted as in winter, the area of the imaginary heat collecting panel 40 placed on a flat surface as shown by the two-dot chain line in FIG. The same amount of solar radiation can be secured with an area S1 smaller than that of S2, and the heat collection rate can be increased by making the entire device smaller.
Since the heat collecting panel 20 is housed in the same housing 30 as the hot water storage tank 1, the heat insulating material 8 surrounding the hot water tank 1 can be used as a heat insulating material for the second heat collecting panel 20, reducing the overall number of parts. It is something that can be done.

Furthermore, even if the second heat collecting panel 20 is installed in front of the hot water tank 1, if there is no solar heat irradiation, the second heat collecting panel 20
This prevents the occurrence of reverse circulation that promotes heat radiation between the hot water storage tank 1 and the hot water storage tank 1, which prevents the hot water in the hot water storage tank 1 from radiating heat at night, making it compact and easy to cool. This makes it possible to obtain a natural circulation type solar water heater that is difficult to use.

18 in the figure is a drain hole of the first heat collecting panel 10, and 28 in the figure is a drain hole of the second heat collecting panel 20. Normally, they are closed, and when freezing is expected, each drain hole 18.28 This is to drain the water in the first heat collecting panel 10 and the second heat collecting panel 20, respectively.

In the figure, a indicates a hot water supply pipe connected to the upper end of the side of the hot water tank 1,
This is for taking out and using the hot water stored in the hot water storage tank 1.

[Brief explanation of drawings]

Figures 1 and 2 are schematic views showing a conventional example, Figure 3 is a partially cutaway perspective view showing an embodiment of the present invention, Figure 4 is a schematic side view of the same, and Figure 5 is a portion of the same. 6 is a partial side view of the same as above, 1 is a hot water storage tank, 2 is a hot water inlet, 3 is a branch pipe, 4 is a water outlet, 7 is a hot water pipe, 10 is a first heat collection panel, 13 is a first hot water outlet, 14 is a water supply pipe, 20 is a second heat collection panel, 23 is a second hot water outlet, 24 is a riser pipe, 25
is the water inlet.

Claims (1)

[Claims] 1. A hot water storage tank that has a hot water inlet at the upper end of one side and a water outlet at the upper end of a branch pipe that branches from the lower end of the other side and extends upward, and a A first flat heat collecting panel having a hollow interior and disposed in front of the hot water storage tank, and a second flat heat collecting panel having a hollow interior and disposed in front of the hot water tank with its surface facing diagonally upward; The heat collection panel has a first hot water outlet provided at the rear end of one side, and its upper end is connected to the hot water pipe inserted into the upper part of the hot water storage tank, and the heat collection panel is integrated toward the rear from the front end of the other side. The second heat collecting panel is connected to the lower part of the hot water storage tank by a water supply pipe extending to
The hot water outlet is connected to the hot water inlet of the hot water storage tank, and the water inlet, which is formed at the same level as the hot water outlet at the upper end of the riser pipe extending upward from the lower end of the other side, is connected to the water outlet of the hot water storage tank. A solar water heater characterized by: