JPS5956045A - Heat accumulating tank - Google Patents

Abstract

PURPOSE:To improve the heat insulating performance for the high-temperature water at the upper part of a heater accumulating tank, by disposing heat-insulating materials between a hot-water storing tank and an outer casing constituting the heat accumulating tank in the manner that the heat insulating performance is increased toward the top of the tank. CONSTITUTION:A hot-water storing tank 2 of a heat accumulating tank 1 incorporates therein a heat exchanger 8 utilizing solar heat and a sheathed heater 7 serving as an auxiliary heat source. Heat-insulating materials 3-5 are disposed from the bottom to the top of the tank and the coefficients of heat transfer of these heat-insulating materials 3-5 are made different from each other. For instance, the lower heat-insulating material 3 is made of glass wool, the intermediate heat-insulating material 4 is made of expanded styrol resin, and the upper heat-insulating material 5 is made of hard urethane resin, so that the coefficient of thermal conductivity is decreased from the bottom to the top of the tank. With such an arrangement, it is enabled to improve the heat-insulating performance at the part of the tank where high-temperature water exists and to reduce the loss of heat radiation of an apparatus for storing hot water for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heat storage tank in a water heater or hot water supply/heating device.

The structure of the conventional example and its problems The structure of the conventional heat storage tank 1 is as shown in FIG. Because it was used during The heat retention was the same in both the high water temperature area and the lower water temperature area. Therefore, from the viewpoint of material costs, it is desired to lower the RFLA performance of the lower low-water temperature section, and there are examples of hot water boilers being rationalized by eliminating the lower part of the heat retaining section. In water heaters, solar heat storage tanks, etc., it is necessary to keep the water warm for long periods of time, so it has been desired to improve heat retention in the hot water wet layer.

OBJECTS OF THE INVENTION The present invention is intended to improve the drawbacks of the above-mentioned conventional examples, and is aimed at improving heat retention in the hot water temperature area.

Structure of the Invention That is, in order to achieve the above-mentioned objective 1-1, the present invention has a heat retention tank disposed between a hot water storage tank and an exterior storage tank constituting a heat storage tank, as the position increases upward from the bottom of the tank. It is characterized by having a monthly structure with enhanced moisturizing performance. With this configuration, it is possible to improve the heat retention of the high water temperature part of the second part of the tank.

Usually, hot water at a temperature of 65 to 85°C is stored in the upper part of the heat storage tank, so the amount of heat dissipated per unit area is about 2.5 times that of the water supply humidity of 20 to 40°C in the lower part. Therefore, in order to maintain the same heat retention properties on both the upper and lower sides of the tank, the insulation coefficients of the upper and lower layers must be set to a value equivalent to the above-mentioned heat radiation ratio.

As a means to increase heat retention, considering the three elements of heat conduction, convection, and radiation, ■methods that utilize heat exchangers with a high insulation coefficient, ■methods that use vacuum insulation and foamed resin to block air. Possible methods include using a foam material, selectively absorbing material that uses heat reflection, and pasting a monthly rate sheet with a surface that shines like a mirror.

From a practical point of view, the method (2) is the easiest to implement in terms of cost and production, and has the greatest effect, so this method will be explained in detail in the following embodiments of the present invention.

For reference, method ■ also used conventional methods for insulation and prevention of dew condensation.
A single chair with glass wool, etc. attached to an aluminum membrane is used to retain moisture in cooling equipment, and it is already showing results.
11 has been done.

DESCRIPTION OF EMBODIMENTS To describe the embodiment shown in FIG. 2, a heat storage tank 1 in a solar water heater or the like includes a hot water storage tank 2, a humidifier 3, 4.
5 and an exterior plate 6, and the hot water storage tank 2 includes a sheath heat 7 and a solar heat exchanger 8 as an auxiliary heating source, and a thermal demolition circulation pump 9. An electric corrosion protection electric rod 10 and a controller 11 are each recessed.

The heat retention rate is 3.4.5 from the bottom, and is made up of the sum of jl'A with different heat transfer coefficients.If the lower heat insulation 443 is made of kl'goufswool, its thermal conductivity λ11
J0.035 K 7/m h 'C, and if the intermediate moisturizer 4 is made of styrene foam resin, for example, λ2 is 0.
03K cafl/ mh'c, and if the upper heat insulation material 5 is made of hard urethane resin, λ5 is 0.022 K7/
mh'c, the thermal conductivity of the upper part of the tank is higher than that of the lower part of the tank.
The zero rate is reduced.

In addition, No. 31, ¥1 shows the change in thermal conductivity λ when changing the 1 degree difference Q between the outside temperature and the outside temperature for each weighing anchor 1.4''.

Further, FIG. 4 shows the values of the heat transfer coefficient when varying the li and nitrate of various types of moisturizers.

The heat factor flow rate is bordering 3 J: li angle, 1. ．．
The thermal conductivity of the first material λ and the plate 1 layer 4 are λ1. λ2.
λ3. If β1,12°46, the unit is K, which is the same as the thermal conductivity λ. It is expressed as β/m h 'C.

The thermal conductivity λ of the moisturizing material used in the present invention is 115 for an iron plate.
．． For polyethylene, it is 0.42.

In the embodiment shown in Fig. 2, the material of the moisturizing material is different from each other.
The heat conductivity can be lowered by increasing the thickness of the plate, and the same efficiency can be obtained by increasing the plate thickness at the top, which is the conventional practice.

Effects of the Invention As mentioned above, the present invention can reduce the heat radiation loss of equipment that must store 1q hours of energy, such as water heaters that use late-night electricity, by increasing the moisturizing performance of the hot water temperature area. It becomes possible.

Furthermore, it is also effective from the standpoint of saving energy and resources to lower the moisturizing performance of the part of the tank 10 where the amount of heat dissipated is lower than that of the 2 parts.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a schematic cross-sectional view of a conventional heat storage tank, Fig. 2 is a schematic cross-sectional view of a heat storage tank according to an embodiment of the present invention, and Fig. 3 is a temperature difference between various types of heat storage and outside air temperature. FIG. 4 is a diagram showing changes in thermal conductivity when the difference is changed. FIG. 4 is a diagram showing changes in thermal conductivity when the thickness of the retainer crystal H is changed. 1... Heat storage tank, 2... Hot water storage tank, 3
, 4.6...Ho7shoi, ] , 6...
・Exterior abduction. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3

Claims (1)

[Scope of Claims] A heat storage tank characterized in that it is configured with a monthly rate that increases heat retention performance as the position increases upward from the bottom of the tank. (2) Claims that the heat insulating material is divided into a plurality of layers in the height direction from the bottom of the tank to the top, and the lower and upper layers have the same thickness and are composed of multiple layers with low thermal conductivity. The heat storage tank according to paragraph 1. (3) Homo/! l? l A: A from the bottom of the tank to the top *l! A heat storage tank 1° divided into i layers, using the same heat retention efficiency and increasing the moisture retention density of the bottom and upper layers.