KR19980033582A - Stratified Heat Storage Tank - Google Patents

Abstract

The present invention relates to a stratified heat storage tank for improving heat storage and use efficiency by stratifying heat storage tanks used for a midnight power boiler, solar water heater, and the like, and installing a physical obstacle filling the porous material or traversing the heat storage tank. In addition, condensation is restricted to increase heat efficiency by stratifying heat in the heat storage tank.In addition, the pipe for hot water supply is spirally installed in the heat storage tank so that water is heated while passing through the pipe to maintain heat stratification structure. While using a combination of heating and hot water, characterized in that the thermal efficiency is greatly improved.

Description

Stratified Heat Storage Tank

The present invention relates to a stratified heat storage tank for enhancing heat storage and use efficiency by stratifying heat storage tanks used in a late night power boiler, solar water heater, and the like with respect to heat.

Recently, as fossil fuel costs soar, interest in late-night power and solar water heaters, which are relatively cheaper, has increased. In the case of midnight electric power heating, the water is heated as an electric boiler during the late night time and used as heating water, and from the end of the end time of the late night electric power heating, the hot water stored in the heat storage tank is heated. In the case of solar water heaters, hot water is used to warm water using solar heat during the day, and at night, the water stored in the heat storage tank is extracted.

The thermal heat storage tank used here has a simple structure that wraps an empty water tank made of FRP with insulation material and connects the water supply / drainage pipe up and down. In this heat storage tank, cold water moves downward due to its specific gravity, and hot water moves upward, causing active convection in itself. In this situation, if the water is circulated using a pump externally for heating or hot water supply, this convection becomes more severe and the hot water above mixes with the cold water below and becomes lukewarm water as a whole. The disadvantage is that it falls easily to inappropriate temperatures.

Accordingly, where a heat storage tank of this type is used, the apparatus is installed in such a manner as to secure a necessary amount of heat by increasing the size of the heat storage tank. For example, a 30-night midnight power boiler uses a thermal storage tank with a capacity of about 3 tonnes. On the other hand, the conventional method for hot water supply was to draw the water stored in the heat storage tank as it is or to install a separate hot water supply device. In the former case, there is a disadvantage in that the heating water is insufficient in the system used in combination with heating, and in the latter case, a lot of additional costs are required to install separately.

On the other hand, in the case of gas heaters or instantaneous hot water heaters, which are widely used, the temperature fluctuates in the hot water supply by heating the pipes through which water flows from the outside with gas or electricity. There was a downside to getting hot water.

In order to solve these problems, the present invention has the purpose of limiting convection between the upper and lower sides of a heat or cold heat storage tank to preserve heat or cold heat for a long time and to improve thermal efficiency.

1 is a cross-sectional view of a stratified thermal heat storage tank constructed using a porous material according to the principles of the present invention.

2 is a cross-sectional view of a stratified thermal storage tank constructed by installing a cross plate in accordance with the principles of the present invention.

3 is a cross-sectional view of a stratified cold heat storage tank constructed for cooling in accordance with the principles of the present invention.

4 is a cross-sectional view of a stratified thermal heat storage tank constructed for a hot water heater according to the principles of the present invention.

5 is a conceptual diagram of the internal temperature distribution according to the height of the heat storage tank according to the passage of time of the conventional heat storage tank.

6 is a conceptual diagram of the internal temperature distribution according to the heat storage tank height according to the lapse of time of the stratified heat storage tank constructed in accordance with the principles of the present invention

7 is a conceptual diagram of the internal temperature distribution according to the heat storage tank height over time when the stratified thermal heat storage tank constructed in accordance with the principles of the present invention is used for cooling

* Explanation of symbols for main parts of the drawings

First degree, second degree

DESCRIPTION OF SYMBOLS 1 Heat storage tank 2 Porous material (FIG. 1) or a cross board (FIG. 2) 3: Input port from boiler 4: Exit to boiler 5: Heating discharge connector 6: Heating return connector

7: External faucet connector for hot water supply 8: Hot water connector 9: External boiler or solar heating plate 10: Water level control device 11: Hot water heating pipe 12: Water or liquid

Third degree

DESCRIPTION OF SYMBOLS 1 Cold heat storage tank 2 Porous material 3 Input port from a cooler

4 outlet to cooler 5 cooling discharge connector 6 cooling return connector

9 cooler 10 water level control device 12 water or liquid

4th

DESCRIPTION OF SYMBOLS 1 Heat storage tank 2 Porous material 3 Input port from a gas heater or an instantaneous water heater

4: Exit to gas heater or electric hot water heater 7: External faucet connection for hot water supply

8: hot water supply connector 10: water level control device 11: hot water heating pipe

The thermal heat storage tank according to the present invention may be provided with a metal plate or a plastic plate or the like to completely or partially traverse the thermal heat storage tank to prevent convection of water in the thermal heat storage tank (2 in FIG. 2), or a porous material of appropriate size (FIG. 2) It is designed to prevent convection by putting the lamp. In this stratification, the cold water at the bottom remains cold and the hot water at the top does not lose heat to the cold water at the bottom. Therefore, when the heating pipe is installed at the upper side of the outlet (5 in FIG. 1 and 5 in FIG. 2) and the return side is in the lower side (6 in FIG. 1 and 6 in FIG. 2), hot water is always supplied from above. The water returns to the bottom but remains cool in the heat storage tank and does not heat up as it takes away the heat from above. By constructing such a structure, the efficiency of the thermal heat storage tank is greatly increased, so that the size of the thermal heat storage tank is reduced and the thermal efficiency is greatly improved.

On the other hand, for hot water supply, copper pipes are spirally wound and installed in a heat storage tank as shown in FIG. 11 and FIG. 11. At this time, the length of the copper pipe is set to a length sufficient to sufficiently rise to an appropriate temperature according to the amount of water used, and water comes in from the lower part of the installed copper pipe (7 in FIG. 1 and 2). 8) of FIG. 8 and 2) of FIG. The thickness of the copper pipe is determined by the amount of hot water used, and the pipe is slowly swung up from the bottom to ensure that the water is heated evenly as it passes through the pipe. This eliminates the need to use the already warm water (12 in FIG. 1 and 12 in FIG. 2) itself, and gradually cools the cold water outside the heat storage tank to exit the heat storage tank. By the time it is heated and discharged to a sufficient temperature, it can be said to be more economical in terms of energy than if it is used by removing hot water from the upper part which is already heated and stored. In addition, this method can be used for both heating and hot water supply by keeping the above-mentioned thermal stratification as it is. Thus, if the heat storage tank is properly sized according to the demand of each home or customer, it can be used for both heating and hot water supply with much smaller size and higher efficiency than the conventional method.

If the same hot water supply principle is applied to a gas heater that serves as a hot water heater or an electric instant water heater, it becomes as shown in FIG. 4. Instead of directly heating the water to be used like a gas heater or an instantaneous water heater, the water in a small thermal storage tank installed separately is heated. Thus, if the temperature in the heat storage tank is kept constant within a predetermined range, the hot water is heated through the copper pipe (11 in Fig. 4) installed in the heat storage tank by external water connected to the faucet (7 in Fig. 4). By slowly heating from the bottom to the inside and discharged at a constant temperature set for hot water supply (8 in FIG. 4), the user can always use a constant temperature of water.

On the other hand, the ice storage device for late night power is used for cooling in the summer. The ice is made by using late-night electricity at night and then gradually melted during the day and used as cooling energy. However, when the stratified cold storage heat storage tank according to the present invention is used, application to cooling is possible even with cold water. At this time, the structure is shown in FIG. 3 and the discharge port (5 in FIG. 3) and the return (6 in FIG. 3) are opposite to the case of hot water. Cold water is stored at the bottom and the return comes in at the top. The cold water coming from the chiller enters the bottom (3 in FIG. 3) and the hot water returned to the chiller goes out (4 in FIG. 3).

The graph shows the temperature change in the heat storage tank installed in this way as shown in the example of FIG. 6 and FIG. FIG. 6 is a case of a heat storage tank, and FIG. 7 is a case of a cold heat storage tank. Figure 5 shows the temperature distribution over time in the thermal storage tank used in the prior art. As can be seen from these graphs, the water in the thermal heat storage tank according to the present invention forms a layer according to its position, and has a feature of preventing the heat loss by maintaining the layer.

Claims (2)

In a heat storage tank that stores hot or cold heat in a specific time zone such as a midnight electric power, a solar water heater, or an ice storage device, and uses it at a different time, a physical material that includes a porous material or crosses the storage tank in whole or in part to prevent convection in the heat storage tank. Regenerative structure that suppresses convection by installing obstacles to stratify the temperature of water or liquid to increase thermal efficiency. In the thermal storage tank of the method 1, a pipe is installed to have a spiral structure for heating (or cooling) of water or liquid so that the water or liquid enters the bottom (or top) and slowly goes up (or bottom). Or a cooling (or cooling) method that is designed to efficiently supply hot water (or cooling water) or heated liquid (or cooled liquid) while maintaining the stratified structure in the thermal storage tank.