JPS5816144A - Method of stratifying water stored in hot water tank - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel method for stratifying stored water in hot water tanks used in various alternative energy utilization devices such as solar energy into high and low temperature water.

Layering the stored water in the water distribution tank increases the effective utilization rate of high-temperature water, and prevents the temperature rise of low-temperature water by mixing within the tank, thereby increasing the efficiency of the entire system such as the heat collector. It plays a big role in

However, since such stratification is greatly affected by increased flow rates within the tank, various attempts have been made to promote and maintain this stratification even at significantly higher flow rates. Conventionally, such attempts have included making the tank a long cylindrical shape, directing the inlet of high/low temperature water into the tank toward the wall, and installing a water dispersion device at the inlet of high temperature water. Although there are various methods, such indirect methods have limitations in maintaining stratification within the hot water storage tank.

Here, stratification of stored water in a hot water tank refers to separating layers of high temperature water and low temperature water in order to prevent high temperature water and low temperature water inside the tank from mixing.

The specific gravity of water is, for example, 0.998 at 20°C and 0.998 at 40°C.
0.983.8Q at 992.60℃0.971.1 at℃
0.958 at 00℃, so if the flow velocity inside the tank is not high in a normal fixed or wet water tank, the high temperature water will rise due to the difference in specific gravity, causing the tank to drop. By gathering upward,
Stratification begins to appear between high temperature water and low temperature water.

The invention is therefore based on the fact that there is a considerable difference in specific gravity between hot and cold water.

According to the present invention, a novel method of forming a direct stratification of hot and cold water in a hot water storage tank is provided.

More specifically, the present invention provides a method for storing water in a wet tank, characterized in that at least one floating separator having a specific gravity of 0.958 to 0.9 (39) is provided in the stored water in the wet tank. A stratification method is provided.

In other words, if a floating separator with a specific gravity between that of high-temperature water and low-temperature water is allowed to float in the stored water of a hot water tank,
High temperature water with a specific gravity lower than the separator rises and is located above the separator, and low temperature water with a higher specific gravity than the separator comes to be located below the separator, resulting in stratification of high and low temperature water. The shape will naturally change.

Although the method of the present invention is extremely simple in concept, it brings about a very large effect in that the water stored in the tank can be clearly stratified into high temperature and low temperature. According to the present invention, it is possible to reliably maintain stratification even under considerably high flow velocities, and furthermore, by using the material of the separator as a heat insulating material, the off-line separator is able to absorb heat at the boundary between the high-temperature water layer and the low-temperature water layer. Conduction loss can also be prevented. Therefore, it is possible to maximize the effective use of high-temperature water collected by the heat collector, etc., and to prevent the rise in temperature of low-temperature water, thereby improving the efficiency of the entire heat collector system.

The present invention will now be described in detail with reference to the accompanying illustrative figures.

1 is a sectional view schematically illustrating the implementation of a novel concept method for forming a stratification of stored water in a hot water tank according to the present invention; FIG.

As seen in the drawings, in the present invention, a separator 1 having a specific gravity intermediate between that of high-temperature water and low-temperature water is suspended in stored water in a hot water tank 4.

For example, if the specific gravity of the separator 1 is set to 0.983, which is equal to the specific gravity of water at 60°C, the high temperature water 2 of 60°C or higher moves upward and is isolated because its specific gravity is υ lower than that of the separator 1. body 1
On the other hand, the low-temperature water below 60°C has a higher specific gravity than that of separator 1, so it moves downward and passes through separator 1.
It will be located below. In other words, high-temperature water and low-temperature water are separated into upper and lower layers around the separator. If the hot water is cooled by heat loss through the hot water tank walls or if the volume is reduced by external consumption of hot water, the separator 1 will move upwards due to its buoyancy. In addition, low-temperature water collects heat, for example! If the volume of the separator decreases by flowing out of the tank to supply other systems, or if high-temperature water is refilled by flowing into the tank from a heat collector plate, etc., the separator l becomes It moves downward depending on its specific gravity. It is therefore possible to reliably maintain the stratification of the stored water in the tank even under fairly high flow rates. moreover,
By using a heat insulating material for isolation #1, it is possible to prevent heat conduction loss at the contact surface between high temperature water and low temperature water.

As for the shape of the separator used in the present invention, many shapes can be used in addition to the disk-like solid shape like the separator 1 described above.

Thus, as can be seen in the drawings, separators 5 made up of small-sized pellets or blocks can also be used.

For example, in addition to the above-mentioned separator 1, if a separator 5 made up of a large number of pellets having a specific gravity of 0.998, which is exactly the same as the specific gravity of water at 20°C, is used, the above-mentioned example may be used. As shown in the drawing, the low temperature water layer below 60°C is
It is possible to separate and form two water layers, a low temperature water layer 6 below 20°C and a medium temperature water layer 3 between -20°C and 60°C.

Thus, according to the present invention, stratification of tank stored water can be ensured in a simple manner, and by selecting the specific gravity of the separator, warm water in a desired temperature range can be collected and used by the designated personnel. In addition, by preventing heat loss in the boundary layer between high and low temperature water, the utilization rate of high temperature water in the tank can be maximized and the efficiency of the entire heat collector system can be improved.

[Brief explanation of the drawing]

The accompanying drawings are schematic sectional views showing embodiments of the invention. 1...Disc-shaped separator, 2...Daytime warm water layer, 3...Medium 7Q water ■, 4...Hot water tank, 5...Small size pellet) II separation body (small size block shape) isolated body), 6...
Low temperature water layer. FIG.1

Claims (1)

[Scope of Claims] 1. Water stored in a hot water tank, characterized in that one or more layers of separators having a specific gravity of 0.958 to 0.999 are provided in a floating state in the water stored in the hot water tank. Stratification method. 2. The method according to claim 1, wherein the separator is a heat insulating material. 3. The method according to claim 1 or claim 2, wherein the separator is disc-shaped. 4. The method according to claim 1, wherein the separator is a small-sized insulating pellet or block-like body.