JPS5836261B2 - Natural circulation solar water heater - Google Patents

Description

[Detailed description of the invention] The present invention relates to a natural circulation type solar water heater.

The solar water heater is connected to the collector 2 and the hot water tank 1, and the water heated by the collector 2 is sent to the hot water tank 1.
In the natural circulation type, the water temperature in the hot water storage tank 1 is gradually raised by convection, in which water with a low temperature in the lower part of the hot water storage tank 1 flows to the collector 2.

By the way, while bathrooms and kitchens are generally installed facing north, solar water heaters are installed facing south, so hot water storage tank 1 is installed on top of the ridge as shown in Figure 1a. It is convenient to install piping.

However, installing the hot water tank 7 on top of the ridge in this way increases the height of the tank and has the problem of spoiling the appearance of the roof, which requires consideration of stability against strong winds. are doing.

On the other hand, in recent years, solar water reservoirs having a horizontally long hot water storage tank 1 as shown in Figs. 2 and 3 have been provided which are installed directly on a flat roof as shown in Fig. 1b. .

In this case, either the hot water storage tank 1 and the collector 2 are constructed almost integrally, resulting in a compact shape, or the use of overflow piping for the hot water supply piping reduces the efficiency of hot water extraction for reasons described later. Currently, lot piping is used to draw hot water from the bottom of the hot water storage tank.

As is clear from Figure 1b, with lot piping, piping over the ridge is not possible, so the piping must be run under the eaves, which causes problems such as poor workability and deterioration of the appearance of the house due to piping. have

Would this problem be solved if piping could be done over the ridge?Let's talk about a conventional horizontal hot water storage tank.In Figure 4, 4 is a float installed at the top of one end of the hot water storage tank 1 It is a water supply section equipped with a valve, and has a hot water storage tank 1.
It operates so that the water level inside is always constant.

Water supplied into the hot water tank 1 through the water supply section 4 is guided downward by a baffle plate 5 provided in the water supply section 4 within the hot water tank 1.

An outflow pipe 6 that leads to the collector 2 is opened below the baffle plate 5, and the water heated by the collector 2 is passed through an inflow pipe γ that opens at the upper part of the hot water storage tank 1 at the other end of the hot water storage tank 1. and flows into hot water storage tank 1.

If the hot water sampling pipe 3 is led out from the upper part of the hot water storage tank 1 on the inflow pipe 7 side, overflow hot water is supplied and piping over the ridge can be performed.

However, this conventional example has the drawback that the hot water extraction efficiency is reduced as described above.

That is, when hot water is supplied, the heated water at the upper right of the hot water tank 1 in the figure flows out from the hot water sampling pipe 3, and the float valve operates in response to the drop in water level at this time. Water flows into the hot water tank 1.

Then, the hot water in the hot water storage tank 1 moves in a direction that connects the opening below the baffle plate 5 and the hot water sampling pipe 3.

As a result, hot water is left behind in the upper left zone shown by A in the figure, so the mixing ratio of hot water is about 8:2 compared to lot piping, reducing the hot water extraction efficiency by about 20%. That's why.

The present invention has been devised in view of the above points, and is capable of effectively suppressing the mixing of hot water and water in the hot water storage tank while providing overflow hot water supply that can be installed directly on a flat roof and piped over the ridge. An object of the present invention is to provide a natural circulation type solar water heater with good hot water collection efficiency.

Detailed description will be given below based on the illustrated embodiment. FIG. 5 is a sectional view of the hot water storage tank 1 in one embodiment of the present invention, in which an overflow type hot water sampling pipe 3 is connected to the upper end of one end, and the upper end of the other end is connected to the hot water sampling pipe 3. There are 4 water supply units installed.

Reference numeral 5 denotes a baffle plate provided on the other end side of the hot water storage tank 1, on the water supply side, the upper end of which protrudes above the water surface, and the lower end forming a water channel with the bottom of the hot water storage tank 1.

On the bottom of the hot water storage tank 1 on the water supply side, there is an outflow pipe 6 that supplies water to the collector 2, and on the hot water supply side, there is an inflow pipe 7 for hot water from the collector 2 that penetrates the bottom and whose upper end is located above the hot water storage tank 1. is provided.

A water inlet 8 with an appropriate cross-sectional area is provided at the top of a baffle plate 5 that partitions the water supply section 4 from the hot water sampling side, and a portion of the water that flows from the water supply section 4 during hot water sampling flows through this baffle plate. Since the hot water flows from the water inlet 8 of 5 to the above-mentioned retaining section A, the hot water stored in the retaining section A is advected in the direction of the hot water sampling pipe 3 and is provided for hot water supply.

FIG. 6 shows another embodiment.

This is a second baffle plate 9 that is installed on the hot water sampling side of the baffle plate 5 by raising the bottom of the hot water storage tank 1 upward, and when hot water is sampled, the water supply section 4 is connected to the hot water sampling side of the hot water storage tank 1. After passing under the baffle plate 5, the water flowing into the tube is blocked by the second baffle plate 9 from directly flowing in the direction of the hot water sampling pipe 3, and is directed upward, that is, in the direction of the strapping part A. The water supplied at is advected to the hot water sampling pipe 3.

FIG. γ shows yet another embodiment.

This is done by extending the hot water collection pipe 3 at 1 in the vicinity of the baffle plate 5 in the hot water storage tank 1 to form a water collection pipe 10, and from both ends of this water collection pipe 10, near the shunting baffle plate 5, and from the collector 2. A water collection hole 11 is bored near the tip of the outflow pipe γ, and hot water flowing into the hot water collection pipe 3 is collected from these two water collection holes 11.

To draw hot water in the vicinity of the baffle plate 5 in this way means to draw the mixed water flowing into the band retention section A, and the water flowing from the water supply section 4 due to this hot water sampling also flows into this band retention section A. Since a portion of the water flows toward the AK, the hot water from the banding section AK is not left behind.

In this way, the present invention has good hot water extraction efficiency even when overflow hot water is supplied, so it can be installed directly on a flat roof and piped over the ridge. Therefore, the shape is compact and construction is easy, and the roof It does not significantly impair the appearance of the product.

[Brief explanation of drawings]

Fig. 1 a + b is a front view showing the installed state of the solar water heater, Fig. 2 is a perspective view of the conventional example, Fig. 3 is a cutaway perspective view of the same, Fig. 4 is a vertical cross-sectional view of the hot water tank as above, Figure 5 ayb is a vertical cross-sectional view and cross-sectional view of one embodiment of the present invention, Figures 6 a and b are vertical cross-sectional views and cross-sectional views of another embodiment of the same, and Figure 1 is a further embodiment of the same. 1 is a longitudinal sectional view of the example, 1 is a hot water storage tank, 2 is a collector, 3 is a hot water sampling pipe, 4 is a water introduction part, 5 is a baffle plate, 8 is a water inlet, 9 is a baffle plate, 10 is a water collection pipe, 11 indicates a water collection hole.

Claims (1)

[Scope of Claims] 1. A horizontally elongated hot water storage tank connected to a collector for collecting solar heat, a hot water sampling pipe is connected to the upper part of one end of the hot water storage tank, a water supply part is provided at the upper part of the other end of the hot water storage tank, and the water supply part is In a natural circulation solar water heater that is partitioned from the hot water sampling side by a baffle plate that opens only at the bottom end, this is a strap that directs water that flows into the hot water storage tank from the water supply section during hot water sampling to the hot water sampling side of the baffle plate. A natural circulation type solar water heater characterized by comprising a means for guiding the water to the water. 2. A natural circulation type solar water heater according to claim 1, characterized in that a water passage is provided in the upper part of the baffle plate. 3. The natural circulation type solar water heater according to claim 1, characterized in that a second baffle plate is provided upright from the bottom of the hot water storage tank on the hot water sampling side of the baffle plate. 4. A water collection pipe is installed in the upper part of the hot water storage tank with one end connected to the hot water sampling pipe and the other end located near the baffle plate, and water collection holes are drilled at both ends of this water collection pipe. A natural circulation solar water heater according to claim 1.