JPS6140917B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a latent heat balance type heat storage tank that transfers heat using latent heat by utilizing a phase change between a liquid and a solid.

In recent years, with the general movement towards energy conservation, the significance of using low-quality heated waste water as a thermal energy source, which has not been considered much in the past, has been emphasized. However, if the temperature starts from 20℃
The method of utilizing heated waste water of about 60℃ as a thermal energy source, so-called low-quality waste heat recovery, has a low heat recovery efficiency compared to the equipment price, and as a result, the cost of recovered energy increases. The amount of hot water that is supposed to be supplied and the amount of hot water discharged during the supply and demand period do not necessarily match, and in order to efficiently supply the required hot water as needed, there are dissatisfied with the capacity of the equipment, the efficiency of heat recovery, and the efficiency of heat storage. However, no device has been proposed that can withstand practical use in terms of recovering and utilizing surplus daytime energy during the winter.

This invention solves the above-mentioned dissatisfaction or drawback, and provides a heat storage medium that is a material that can use the transfer and reception of heat as latent heat (heat of fusion and heat of solidification) by utilizing the phase change between liquid and solid. , is filled and sealed in a metal tube with fins on the outside, and the thermal energy source of heated waste water is recovered as the heat of fusion, which is the phase change of the heat storage medium from solid to liquid, and then from the liquid to solid of the heat storage medium. To provide a latent heat balance type heat storage tank which is characterized by supplying hot water adjusted to a preset appropriate temperature and used for heating, bathing, cooking, washing, etc., using the heat of solidification accompanying the phase change of With the goal.

As for the structure of the finned metal tube used in such a latent heat balance type heat storage tank, a spiral fin tube metal tube is generally the most preferable, and a plate type is used when the purpose is to recover heat in a temperature range where there are few problems such as thermal distortion. It may be a so-called cross fin type metal tube of a plate fin coil type in which fins are inserted into a tube group.

The material required for this finned metal tube is any material that has corrosion resistance and good thermal conductivity to the heat storage medium sealed inside the tube and the fluid outside the tube. They are often selected from materials such as aluminum, stainless steel, steel, copper, and lead. Further, the metal tube and the fins may be made of two or more different materials, but in such a design, a combination of a steel tube and aluminum is most preferable.

As a method for manufacturing the finned metal tube, the following method can be adopted. For example, there is a rolled finch tube method in which the fin and pipe are integrated, a welded finch tube method in which hoop material is wrapped around the base and welded at the base, or a rolled finch tube method in which the fin and pipe are integrated.
It is an inset finch tube method. Alternatively, vertical grooves or spiral grooves may be simply provided on the outer surface of the metal tube by mechanical processing.

Auxiliary connection piece that separates and isolates heated drainage and water supply area,
The structure of the partition plate may be any structure as long as it has the minimum heat transfer area necessary to perform the required heat exchange between the two fluids.
In order to reduce the cost of pumping power required for hot water drainage and water supply, flat plates or corrugated plates are generally used. The material for this partition plate, etc. may be any material that can be welded to the metal tube or fin material and has excellent corrosion resistance and good thermal conductivity, such as aluminum, stainless steel,
Steel, copper, lead, etc. are preferred.

In addition, heat storage media that can be used in this latent heat balance type heat storage tank include oils and fats, waxes, hydrocarbons, higher alcohols, and polyhydric alcohols that have a melting point (or freezing point if the melting point is not clear) in the range of 10℃ to 90℃. and higher fatty acid waxes, any material may be used as long as it does not interact with or corrode the metal pipe material and has a large heat of solidification, and is relatively inexpensive. General commercially available materials that can be stably supplied, such as stearic acid, wood wax, beef tallow, dodecyl laurate, candelia wax, lauryl alcohol, paraffin wax,
Examples include naphthalene and glycerin.

The invention will now be described with reference to the illustrated embodiments.

A is a main case with an open top and bottom and a rectangular cylindrical peripheral wall. b is a metal tube with fins 1, and a heat storage medium that undergoes a phase change between liquid and solid is sealed in this metal tube b. Further, the metal pipes b are connected to each other by the fins 1 and the auxiliary connecting pieces 2 to form a heat storage wall c, and are partitioned into a zigzag shape in the main body case a, with a water supply area 3 and a heated drainage area 4 on both sides. It is divided into

In d, a hanging wall 6 is provided around the top plate 5, and the inside thereof is partitioned in a zigzag shape by a partition wall 7.
The upper header e has a water supply area 3' on one side and a hot area 4' on the other side, and has an upright wall 9 around the bottom plate 8, and partitions the inside in a zigzag shape with a partition wall 10. This is a lower header with a water supply area 3'' and a heated drainage area 4'' on the other side.

The upper and lower end surfaces of the peripheral wall of the main body case a and the upper header d
The lower end surface of the hanging wall 6 and the standing wall 9 of the lower header e
The upper end surface, the upper and lower end surfaces of the heat storage wall c, the lower end surface of the partition wall 7 of the upper header d, and the upper end surface of the partition wall 10 of the lower header e are each treated with water honey by an appropriate method. 3′ and 3″, heated drainage area 4
and 4' and 4'' are consecutive.

In this way, the water supply inlet A ₁ to the continuous water supply area is provided at the front side of the standing wall 9 of the lower header e, and the water supply outlet A ₂ is provided at the rear side of the hanging wall 6 of the upper header d. There is.

Similarly, the heated water inlet B ₁ to the continuous hot water drainage area is provided on the front side of the hanging wall 6 of the upper header d, and the heated water water outlet B ₂ is provided on the rear side of the standing wall 9 of the lower header e. There is.

The water supplied from the water supply inlet _A1 fills the water supply area 3'' of the lower header e, the water supply area 3 of the main body case a, and the water supply area 3' of the upper header d, and is taken out from the water supply outlet _A2 . The heated waste water sent from the heated waste water inlet _B1 is heated to the heated water drain area 4' of the upper header d,
It fills the warm water area 4 of the main body case a and the hot water water area 4'' of the lower header e, and is taken out from the hot water outlet _B2 .

In this case, it is optional whether to exchange heat through the heat storage wall c and the partition walls 7 and 10 while flowing both the supplied water and the heated waste water, or to perform heat storage by the heated waste water and heat radiation to the supplied water separately.

In addition, it is preferable to connect a circulation pump to the water supply system and the heated drainage system.

As is clear from the above, the heat storage tank of the present invention has a heat storage wall formed by enclosing a heat storage medium in metal tubes with fins and sequentially connecting the metal tubes with the fins, and forming a zigzag pattern inside the main body case. The heat storage wall is partitioned into a water supply area and a heated drainage area on both sides of the partition wall, and an upper header and a lower header are provided above and below the main body case. Therefore, heat exchange between the water supply and the heated waste water is carried out extremely effectively via the heat storage wall having a large heat transfer area.

Furthermore, in conventional heat storage tanks in which a small-diameter water pipe is inserted into a thick layer of heat storage, the heat storage medium on the surface layer is involved in heat exchange between the water supply and heated waste water. However, in the present invention, the heat storage medium is sealed in a metal tube, and the metal tubes are connected by fins to form a heat storage wall. Since a drainage area is provided, the latent heat of the heat storage medium can be fully utilized.

In addition, the present invention provides an inlet for heated waste water and an inlet for water supply in the upper header, and an inlet for hot waste water and an inlet for water supply in the lower header. Since there is a so-called counterflow upward and along both sides of the heat storage wall, heat exchange is performed efficiently, and heated waste water with low quality heat quantity can be effectively used as a thermal energy source.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a perspective view, FIG. 2 is a cross-sectional view, and FIG. 3 is a perspective view showing the main body case and upper and lower headers separated. b...metal tube with fins, 1...fins, c...
...heat storage wall, 3,3',3''...supply area, 4,4',
4″...Heat water area, a...Main case, 7,10
...Partition wall, d, e...Upper and lower header, B ₁ ...
Warm water inlet, A ₂ ... Water supply outlet, B ₂ ... Warm water discharge outlet, A ₁ ... Water supply inlet.

Claims (1)

[Claims] 1 A heat storage wall made by sequentially connecting multiple metal tubes with fins filled with a heat storage medium that undergoes a phase change between liquid and solid, with the interior partitioned in a zigzag pattern, with a water supply area on both sides of the heat storage wall. An upper header and a lower header are provided above and below the main body case, which divides the water supply water area and the hot water drainage area on both sides of the partition wall, and the upper header has an inlet for the hot water drainage and an outlet for the water supply. A latent heat balance type heat storage tank characterized in that the lower header is provided with an outlet for hot waste water and an inlet for water supply.