JPS6013008Y2 - solar water heater - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a solar water heater.

A conventional indirect heating type solar water heater is constructed as shown in FIG.

In the figure, 1 is a heat collector, 2 is a hot water storage tank, and hot water storage tank 2
A coil-shaped heat exchanger 3 is installed inside L).

The heat exchanger 3 includes a feed pipe 5 provided with a circulation pump 4,
It is connected to the heat collector 1 by a return pipe 7 provided with an expansion tank 6, and a heat medium is circulated inside these.

1. However, since the use of a coil-shaped heat exchanger 3 with a complicated structure increases manufacturing costs, we proposed a method that includes a jacket type heat exchanger.

In the jacket type heat exchanger, as shown in the jacket type heat exchanger 8 of the reaction vessel 2' in Fig. 2, there is a heat medium inlet 9 at the bottom.
It is common to provide a heating medium outlet 10 at the top.

Moreover, in reaction vessels, steam is often used as a heating medium.

However, in indirect heating type solar water heaters, the heating medium is liquid (mainly antifreeze), so if the heating medium is introduced from the bottom and taken out from the top, the heating medium will be heated from the heating medium inlet 9. As a result of experiments, it was found that the heat exchange efficiency deteriorates because the heat exchanger flows in a short circuit through the endmost path of the medium outlet 10 and stagnates in other parts.

Therefore, the object of this invention is to provide a solar water heater with high heat exchange efficiency in which there is no accumulation of heat medium or short circuit, and heat exchange is performed at approximately -100% throughout the jacket type heat exchanger.

An embodiment of this invention is shown in FIGS. 3 and 4.

In the figure, 11 is a heat collector and 12 is a hot water storage tank.

The hot water storage tank 12 includes a drum-shaped hot water storage body 13 and a jacket type heat exchanger 14 provided on the outer periphery of the hot water storage tank body 13.
A cold water outlet 15 is provided at the bottom, and a hot water outlet 16 is provided at the top.

The jacket type heat exchanger 14 has annular bulges 14a on the upper and lower edges.
, 14b, and a heat medium inlet 1 is provided in the upper annular bulge 14^.
- 7b< is provided, and a heat medium outlet 1- is provided in the lower annular bulging portion 14b.

The heat medium inlet 17 and the heat medium outlet 18 are provided at the same position in the circumferential direction of the heat exchange jacket 14 .

The heat medium outlet 81 is connected to the lower part of the heat collector 11 via the feed pipe 2 in which the circulation pump 19 is installed, and the heat medium inlet 1
7 is connected to the upper part of the heat collector 11 via a return pipe 21.

A portion of the return pipe 21 extends above the heat collector 11, and an expansion tank 22 is provided at the top thereof.

Further, the annular bulge 1 above the jacket heat exchanger 14
An air vent valve 23 is provided at 4a.

Next, the operation of this solar water heater will be explained.

The heat medium is circulated between the heat collector 11 and the jacket heat exchanger 14 by driving the circulation pump 19 .

The heat exchanged by the jacket type heat exchanger 14 is stored in ice within the hot water storage tank body 13.

Air generated in the jacket heat exchanger 14 is removed from the air vent valve 2.
Remove from 3.

In addition, the heated heating medium expands, tank 2.2 is called 1
・ ・ □? ′) Product = ← Packing! In this case, the heat exchange occurs between the ice and antifreeze in the hot water storage tank, that is, heat exchange between liquid and liquid.

When the jacket type heat exchanger 14 is used, when antifreeze is introduced from the upper part to the lower part, the antifreeze gives heat to the water in the hot water storage tank strip 13 and the temperature decreases, resulting in an increase in specific gravity and the water drops.

The temperature of the water in the hot water storage tank main body 13 increases, and as a result, the specific gravity decreases and rises.

Therefore, a liquid-liquid counterflow type heat exchange is performed.

Therefore, excellent heat exchange efficiency can be obtained.

Contrary to this, if you put antifreeze in from the bottom and let it out from the top,
Because the above logic does not apply, antifreeze accumulates and short circuits occur.

1 Also, the heating distribution force within the hot water storage crystal body 13
Assuming that the situation is as shown in Figure 11, 0□>h>t3>・
...to).

When heat exchanger 1 population temperature t1 is 1+≧t3, '! 9
``s temperature layer, without heat exchange, jay t5*
The temperature layer of te and the exchange are performed, and the hot water tank body
Increase the internal temperature.

: This type of use is not possible with coil heat exchangers.

FIG. 5 shows the upper annular bulge 14 with the heat medium inlet 17 and the heat medium outlet 18 corresponding to the diameter direction of the heat exchange jacket 114.
- provided respectively on the leg and the lower annular bulge 14b.
Other than 1. This is similar to the embodiment of .

Even in the case of configuring the
Ru.

FIG. 8A shows the second embodiment and the conventional example.

8th 8th UgAB represents the second embodiment, and the distributions, respectively.

8th) The hatched part shows the temperature of the outer surface of the jacket type heat exchanger ms, t4, which was measured by Thermopure at 5 degrees, and T, ~T5 show the temperature in each temperature range shown by the hatched part. show.

Here, Tn'>T=>Ts>T4>T's. As can be seen from each of the above, the wall temperature of the jacket type heat exchanger 14 of this embodiment has less low temperature region than that of the conventional example. It can be seen that the heat exchange rate is small, and the total heat exchange is approximately -.

To explain the experimental conditions, the dimensions and materials of each part of the hot water storage tanks 2' and 12 in the first and second embodiments and the conventional example are the same, and are as follows.

In Figures 6 and 7, H1 = 1000゜ya =
810. Dl-6,OO,De=590t hi=9
0t 112=lω9 h3yo50. dt potato 20. Sound=
It is 5.

The unit is shogun.

Here, Hl is the height of the hot water storage tank body 2', 12, H2 is the total height of the jacket type heat exchanger 8, 14, Dl is the inner diameter of the jacket type heat exchanger 8, 14, and D2 is the outside of the hot water storage tank body 13. The diameter, h□ is the difference in the upper end position ρ between the jacket heat exchanger 8, 14 and the hot water storage tank body 13, ρ is the difference in the lower end position, h3 is the internal height of the lower annular bulge 1, 4b, and d□ is the difference in the lower end position. The radial width inside the lower annular bulge 14b is connected to the heat exchange jackets 8 and 1.
It has a radial width of 4.

The heat exchange jackets 8, 14 and the hot water storage tank bodies 1, 3 are made of stainless steel, and have a heat exchange area of about 1.5 Wt.

The flow rate of the heat medium is approximately 4.51/min, the heat medium inlet 9 of the heat medium,
The temperature of water in the hot water storage tank body 13 is approximately 20°C.

FIGS. 9 and 10 show still other embodiments.

That is, an air vent pipe is provided that extends upward from the upper field bulge 14 a of the jacket heat exchanger 14 and is connected to the feed pipe 20 , and a constricted part 25 is provided in the middle of the air vent pipe 24 .
has been established.

An orifice may be provided instead of the constriction portion 25.

By providing the air vent pipe 24 in this way, when air accumulates inside the jacket heat exchanger 14, the air vent pipe 24
Air escapes from 4 through the collector 11 and the expansion tank 22.

Therefore, a gas-liquid separation phase does not occur within the jacket heat exchanger 14, and corrosion due to gas-liquid separation does not occur.

In addition, deterioration in heat exchange capacity due to air intrusion is prevented.

Note that the air vent pipe 24 is provided with a constricted portion 25' or an orifice, so that the flow of the heat medium is prevented.

The rest is the same as the second embodiment. As mentioned above,
In the solar hot water heater of this invention, the heat medium flows in from the top of the jacket heat exchanger and flows out from the bottom, so there is less stagnation and short circuits of the heat medium in the jacket heat exchanger, and overall Approx.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional example, Fig. 2 is an explanatory diagram showing a cross section of a conventional reaction vessel, and Fig. 3 is an explanatory diagram of an embodiment of this invention.
FIG. 4 is a sectional view of the hot water storage tank, FIG. 5 is a sectional view of an old hot water tank according to the second embodiment, and FIG. 6 is a sectional view of the hot water storage tank 9 of the first and second embodiments and the conventional example. Figure 7 is an enlarged cross-sectional tooth of part ■ in Figure 6. Figures q and A to C are illustrations of the distribution of the first and second embodiments, respectively. The figures are a description of the 39th embodiment.''■Figure 10 is a sectional view of the air vent pipe, and □Figure 1 is an explanatory view of the operation of the first embodiment. 11... Heat collector, 12... Hot water storage tank, 1
3...Hot water tank body, 14...Heat exchange jacket, 17...Heat medium inlet, 18...
・Heat medium outlet, 19...Circulation pump, 20...
...Feed piping, '21... Return piping.

Claims (1)

[Scope of utility model registration request] a hot water storage tank having a heat collector, a jacket type heat exchanger having a heat medium inlet in the upper part and a heat medium outlet in the lower part, provided on the outer periphery;
A heat medium feed pipe connected from the heat medium outlet of the jacket type heat exchanger to the heat collector and having a circulation pump interposed therebetween; A solar water heater comprising a return pipe connected to a heat recording medium inlet.