JPS6023756A - Hot-water reserving tank - Google Patents

Abstract

PURPOSE:To permit to use water in the hot-water reserving tank effectively by a method wherein the lower part of the hot-water reserving tank is provided with a double bottom to form a heat exchanger and the whole of the hot-water reserving tank and the heat exchanger is covered by an outer shell under keeping a space therebetween while the space is kept in a vacuum. CONSTITUTION:Heat medium 6, whose temperature is risen in a heat collector 8 by solar heat, enters into the heat exchanger 22 from the inlet port 24 thereof and the heat medium 6, having a high temperature, exchanges the heat thereof with water 15 through a first bottom plate 18 in the hot-water reserving tank 17 while the heat medium 6, whose temperature is reduced, is sent from an outlet port 23 into the heat collector 8 through a heat collecting pipeline 10. Water 15 in the hot-water reserving tank 17 is heated by the bottom plate 18, therefore, it can be heated in 100% substantially and the water, which is not heated, will never be reserved in the tank at all times. The hot-water outlet pipe 20 passes through the space 26 being insulated by vacuum, therefore, temperature keeping effect is good and thereby reducing the influence of the top of the hot-water reserving tank 17 being cooled even though the hot-water supplying port 14 is cooled by atmospheric air.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improving the hot water storage effect of collecting solar heat or outside air heat.

Conventional structure and its problems Conventionally, when collecting solar heat, a heat exchanger 3, which is a pipe 2 formed into a coil or coiled tube shape, is installed from the lower side of the hot water storage tack 1, as shown in Fig. 1. ing. The heat exchanger population 4 and the heat exchanger outlet 5 that communicate with the inside of the pipe 2 of the heat exchanger 3 are a heat collection pipe that connects the circulation pump 7 of the heat medium 6, the heat collector 8, and the expansion tank 9. 10 are connected. The outside of the hot water storage tack 1 is surrounded by an exterior layer 1, and the hot water storage tank 1
A heat insulating material 12 such as glass wool covers the hot water storage tank 1 between the hot water storage tank 1 and the exterior layer 1.

Note that a water supply port 13 was provided at the bottom of the hot water storage tank 1, and a hot water supply port 14 was provided at the top of the hot water storage tank 1 directly above. The heat medium 6 heated in the collector 8 by solar heat is circulated by the circulation pump 7 and is attached to the hot water tank 1, passing through the heat exchanger 3 to heat the water 15 in the hot water storage tank 1. That's what I was doing. However, although the water 15 in the hot water storage tank 1 is heated above the heat exchanger 3, the water 15 below the heat exchanger 3 is not heated, so that the effective amount of hot water stored is reduced. Further, since the hot water supply port 14 is directly exposed to the outside air from the top, the cooled hot water in the hot water supply port 14 causes convection, and the water temperature in the hot water storage tank 1 gradually decreases. Furthermore, the elongated heat exchanger 3 supported on one side may be deformed due to vibration and impact during transportation, or unreasonable force may be applied to the supported root portion 16, which may have an adverse effect.

OBJECTS OF THE INVENTION The present invention is intended to solve these conventional problems, and is aimed at making it possible to effectively utilize water in a hot water storage tank.

Structure of the Invention The present invention provides a hot water storage tank with a double-bottom structure, and uses this double-bottom portion as a heat exchanger for external heat, such as solar heat. The solution is to provide a completely sealed exterior that wraps around the hot water tank at a certain distance and maintains a vacuum in the space between the hot water tank and the exterior. Note that the hot water pipe that comes out from the hot water outlet at the top of the hot water storage tank passes through a vacuum-maintained space and is led to a hot water supply port provided at the bottom of the hot water storage tank device. With this configuration, it is possible to heat almost 100% of the water in the hot water storage tank, and since the hot water inlet is located at the bottom, there is no convection effect even if the hot water near the hot water inlet gets cold, so the amount of hot water stored / the temperature of the water in the tank can reduce the decline in

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

The lower part of the hot water storage tank 17 has a double bottom 18.19, and the hot water outlet 21 is connected to the hot water tap 20 at the top of the hot water storage tank 17,
It is a closed type tank with a water supply port 13 at the bottom, and the double bottom part is formed as a heat exchanger 22 for solar heat, outside air heat, etc., and the tank is completely sealed except for the entrance and exit ports 23 and 24 for the heat medium 6. The first layer bottom plate 18 between the heat medium 6 and the water 15 in the hot water storage tank 17 is a heat transfer part that exchanges heat.

An exterior 2 that maintains a certain distance from the hot water storage tank 17 so as to wrap around the hot water storage tank 17 forming a double bottom 18 and 19.
5 is provided, and this exterior 25 is hermetically sealed, and a space 26 between the exterior 25 and the hot water storage tank 17 is kept in a vacuum.

Furthermore, a hot water storage tuck 17 is connected to the hot water supply port 14 provided at the bottom of the exterior 25.
A hot water tap pipe 20 is connected from the top through a vacuum-insulated space 26.

A required number of reinforcing tools 27 made of a thermally poor conductor material are provided at appropriate locations to maintain a constant space between the hot water storage capacity 17 and the exterior 25.

Leg fittings 28 supporting the hot water storage tank 17 are fixed through the exterior 25.

A heat collector 8 , an expansion tank 9 , and a circulation pump 7 are connected to the outlet 2 a and the inlet 24 for the heat medium 6 of the heat exchanger 22 integrated with the hot water storage tank 17 , and the heat collection system is connected by the heat collection pipe 10 . ing.

In the above configuration, the heating medium 6 whose temperature has risen in the heat collector 8 due to solar heat is transferred to the heat exchanger 22 by the circulation pump 7.
The inside of the heat exchanger 22 is filled with the heat medium 6,
High-temperature heat medium 6i-]:] Inside the hot water storage tank 17 - heat exchanges with water 15 on the heavy bottom plate 18, and the low-temperature heat medium 6 is collected through the heat collection pipe from the heat exchanger 22 Dehita It is sent to vessel 8.

Water 15 in the hot water storage tank 17 is heated by the first layer bottom plate 18, flows naturally due to the difference in specific gravity, and heat is transferred to the upper part of the hot water storage tank 17. Since the hot water outlet pipe 20 passes through a vacuum-insulated space 26, the heat retention effect is good, and even if the hot water supply port 14 is cooled by outside air, the influence of cooling on the top of the hot water storage tank 17 is reduced.

It is also effective even if the shape of the single bottom plate (not shown) is convex downward instead of convex upward.

Effect of the invention According to the present invention, the following effects are obtained.

(1) By making the bottom of the hot water storage tank a double structure and using this double structure as a heat exchanger using a heat medium, the water in the hot water storage tank can be heated by almost 100 degrees, and the water that is not heated can be heated. You will no longer have to hold it all the time.

(It) Since the heat exchanger is a single bottom plate, troubles caused by vibration during transportation can be prevented compared to pipe-type heat exchangers.

■ Vacuum insulation of the space between the exterior and the hot water storage tank solves the problems associated with work pollution when glass wool was used in the past. Additionally, because conventional exteriors were secured with screws or rivets, there were small gaps. This is because when installed outdoors, the warm air inside the glass wool that was kept warm around the hot water storage tank due to wind pressure moves outside due to breathing action, and cold air enters inside, making the heat retention effect weak. The area around the hot water storage tank was still exposed to cold air, causing condensation and corrosion from the outside, but in the case of the present invention, the exterior was completely sealed by welding (seaming, ultrasonic, brazing), etc. The insulation performance has been improved, and there are no problems with condensation or corrosion.

The hot water outlet installed at the top of the hot water storage tank is connected to the hot water supply opening installed at the bottom by a hot water pipe, so even if the hot water supply opening that is in contact with the outside air gets cold, the water temperature in the area will drop, but the hot water inside the hot water storage tank will not be affected. is not affected by this and can maintain heat retention time.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a conventional heat collection system and a hot water storage tank, and FIG. 2 is a configuration diagram of a heat collection system and a hot water storage tank device according to an embodiment of the present invention. 17...Hot water storage tank, 18.19...
Double bottom, 20... Hot water pipe, 22... Heat exchanger, 25... Exterior, 26... Space section.

Claims (3)

[Claims] (1) The lower part of the hot water storage tank is made into a double bottom, and this double bottom space is formed as a heat exchanger for solar heat, outside air heat, etc., and the entire hot water storage tank and heat exchanger are covered with an exterior while maintaining space; A hot water storage tank device configured to maintain a vacuum in the space. (2) A hot water tap device that has a water supply port at the bottom of the hot water storage tank, a hot water outlet at the top of the hot water storage tank, and is led from the hot water tap. (3) Near the double bottom heat exchanger installed at the bottom of the hot water storage tank.