JPH0571872B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air conditioner, and particularly to a device using a latent heat storage material.

(Prior art) An example of a conventional device of this type is shown in Fig. 3 a and b.
As shown in the figure, a latent heat storage material 1 is placed in a box-shaped heat storage container 2.
A heat exchanger 3 having a pipe 6 connected to a refrigerant pipe of an air conditioner and a horizontal fin 4 fixed to the pipe 6 was arranged inside the heat storage container 2. . Furthermore, a mirabilite-based material was used as a latent heat storage material. (for example,
Machida et al., "Development and demonstration test of latent heat storage material for greenhouses," Japan Society of Solar Energy, Proceedings of the 9th Research Conference, (December 6-8, 1983), pp. 49-50) (Problems to be solved by the invention) Point) In the conventional device, as can be understood from FIGS. 3a and 3b, the distance/interval between the latent heat storage material 1 and the heat transfer surface of the heat exchanger 3 equipped with the horizontal fins 4 in the heat storage container 2 As the latent heat storage material 1 solidifies or melts on the heat transfer surface, and as the thickness of the solid phase or liquid phase increases, there are parts that do not easily solidify or melt. However, since the heat storage container 2 is a relatively large box-shaped container, it is extremely difficult to easily change the shape of the container in order to change the heat storage capacity. There were flaws. Regarding the inability to efficiently and quickly store heat due to the increase in the thickness of the solid phase or liquid phase, the following 2.
This will be explained using figures. 2A to 2D are diagrams showing changes in the thermal resistance of the latent heat storage material 1 during solidification and melting in the heat storage container 2. FIG. The horizontal axis represents the distance from the heat transfer surface of the pipe 6, and the vertical axis represents the thermal resistance. 1 on the horizontal axis represents the distance from the pipe 6 in the heat storage container 2 to the farthest latent heat storage 1.

Let us now assume that the thickness of the solid phase when the thermal resistance suddenly increases and the heat transfer characteristics suddenly decrease during solidification is a. Let the thickness of the liquid phase be b. Second
Figure a shows the solidified state, and Figure 2 b shows the melted state, where the thickness b of the liquid phase is greater than the thickness a of the solid phase. Further, FIG. 2c shows the solidified state, and FIG. 2d shows the melted state, where the thickness a of the solid phase is the same as or larger than the thickness b of the liquid phase. As shown in each figure in FIG. 2, the thermal resistance may change rapidly at point a or b.

By the way, in the conventional heat storage container 2 shown in the plan view of FIG. 3b, the distance l from the heat transfer surface 9 of the pipe 6 to the farthest end of the latent heat storage material is large, that is, l>a or l>b. Because of this, there were some parts that did not solidify or melt easily. Furthermore, when the latent heat storage material is in a liquid state, convection occurs, causing temperature unevenness in the vertical and horizontal directions within the heat storage container. Due to these factors, there was a drawback that heat could not be stored efficiently and quickly.

(Means for solving the problems) In order to eliminate these drawbacks, the present invention has the following features:
The heat storage container is an elongated columnar hollow sealed container, and the heat exchanger has a pipe connected to a refrigerant pipe that passes through the heat storage container up and down, and a vertical fin and a horizontal fin on the pipe so as to be in contact with the inner surface of the heat storage container. The heat transfer surface of the pipe is configured to face the latent heat storage material at a short distance, and the latent heat storage material has a low thermal conductivity and can utilize the latent heat during melting and solidification at a constant temperature. This is a latent heat storage unit filled with

(Function) Since the present invention is configured as described above, the latent heat storage material in the heat storage container can be easily and uniformly solidified or melted, and the heat storage material can be efficiently and quickly stored. Since it is a hollow sealed container, various units with different heat storage capacities can be provided by preparing units with different heights.

(Embodiment) FIGS. 1a, b, and c show one embodiment of the present invention, in which FIG. 1a is a side sectional view, FIG. 1b is a plan sectional view,
FIG. 1c is a side sectional view of the pipe clamping and holding device. In each figure of Fig. 1, 1 is a latent heat storage material, 2
is a heat storage container, and 3 is a heat exchanger. Heat storage container 2
is a hollow sealed container with a columnar shape of, for example, 5 cm x 5 cm x 100 cm, and a pipe 6 constituting the heat exchanger 3 passes through the center, and the upper surface 2-1 and the lower surface 2-1 are connected to each other.
-2 is provided with a tightening holding device 7 for sealing the pipe 6. Although not shown, the pipe 6 is connected to piping from an air conditioning system. Therefore, a refrigerant flows into and out of the pipe 6, and the refrigerant is, for example, R-11. The heat storage container 2 is provided with a filling port for the latent heat storage material 1, and the filling port is appropriately provided, for example, on the upper surface 2-1 with a structure that can be closed tightly after filling.

The heat exchanger 3 is composed of the pipe 6, vertical fins 5, and horizontal fins 4. The vertical fins 5 are fixed in the longitudinal direction on the outer peripheral surface of the pipe 6, and the other end is connected from the outer surface of the pipe 6 to the inner surface so that the other end contacts the inner surface 2-3 of the heat storage container 2 with a slight gap. Side 2-
It is formed of a plurality of flat plate-like members radially facing 3. The horizontal fin 4 has an end surface fixed horizontally to the outer peripheral surface of the pipe 6 and the vertical fin 5, and the other end is fixed to the heat storage container 2.
is in contact with the inner surface 2-3 with a slight gap,
It is formed of a plurality of flat plate-like members arranged at regular intervals in the longitudinal direction of the pipe 6.

In FIG. 1c, reference numeral 7-1 indicates a through-portion tightening cap 8, and a rubber packing 11 indicates a mounting seat. In the clamping and holding device 7, since there is a risk that the latent heat storage material 1 may leak, the pipe 6 is clamped and crimped to the mounting seat 11 provided on the heat storage container 2 via the rubber packing 8 by the penetrating part clamping cap 7-1. . The heat storage container 2 configured as described above is filled with the latent heat storage material 1 and sealed. The latent heat storage material 1 has a low thermal conductivity and can generate latent heat during melting and solidification at a constant temperature.
In this example, coconut alcohol was filled as it can utilize the latent heat during melting and solidification in the range of 10° to 30°C. It is preferable to use the product name "Calcol". As shown in FIG. 1b, the distance x between the farthest part of the pipe 6 and the heat transfer surface 9 is such that a portion that does not solidify or melt is less likely to occur compared to the distance l of the conventional pipe shown in FIG. It is understood that

The operation of this embodiment will be explained with reference to the figures of FIGS. 2a to 2d.

(1) When a heat medium is flowed into the pipe 6 of the heat exchanger 3 to solidify the completely melted latent heat storage material 1, and a<b and x=a.

A solid phase precipitates on the heat transfer surface of the heat exchanger 3, and as shown in FIG. 2a, the thermal resistance increases and the heat transfer characteristics deteriorate. However, in the embodiment of the present invention, Therefore, the latent heat storage material 1 in the heat storage container 2 is completely solidified before its heat transfer characteristics suddenly decrease, and the horizontal fins 4 and vertical fins 5 of the heat exchanger 3 are able to prevent the upper and lower parts of the heat storage container 2. Solidification is possible with uniform temperature in both direction and horizontal direction.

(2) When a heating medium is flowed into the pipe 6 of the heat exchanger 3 to melt the completely solidified latent heat storage material 1, and when a<b and x=a.

A liquid phase is generated on the heat transfer surface of the heat exchanger 3, and as shown in FIG. 2b, the heat transfer characteristics deteriorate, but x=a
Therefore, the latent heat storage material 1 in the heat storage container 2 is completely melted before its heat transfer characteristics suddenly decrease, and the horizontal fins 4 and vertical fins 5 of the heat exchanger allow the heat storage material 1 in the vertical direction of the heat storage container 2 to Can be melted evenly in horizontal direction.

FIGS. 2c and d show the case where a≧b and x=b, but since the explanation is the same as that of FIGS. 2a and 2b, the explanation will be omitted.

The heat storage container 2 shown in FIG. 1B as an embodiment of the present invention has a square planar cross section, but as another embodiment, the heat storage container 2 may have a circular planar cross section. Of course, in this case, the shape of the horizontal fillet 4 is circular. The other embodiments have the same structure and operation as the first embodiment described above except for the circular shape, so illustrations, etc. are omitted.

(Effects of the Invention) As explained above, the present device embodying the present invention can efficiently and quickly solidify and melt latent heat storage materials, and can be constructed by combining multiple materials, so it has the following advantages: be.

(1) By incorporating it into a heating and cooling system, it is possible to efficiently and quickly store heat and reduce the equipment capacity.

(2) The heat storage capacity can be varied by changing the height of this device or by combining multiple devices, so it can be flexibly handled depending on the scale of the air conditioning system.

(3) The latent heat storage material filled in this device is not corrosive to metal, and once filled, it can maintain its performance for a long period of time.

(4) Various applications can be considered as a latent heat storage unit.

There are other effects.

[Brief explanation of the drawing]

Figures 1a, b, and c show one embodiment of the present invention, in which Figure 1a is a side sectional view, Figure 1b is a planar sectional view,
FIG. 1c is a side sectional view of the pipe clamping and holding device. FIGS. 2a, b, c, and d are diagrams showing changes in thermal resistance. Figures 3a and 3b are diagrams of the conventional device,
FIG. 3a is a side sectional view, and FIG. 3b is a plan sectional view. 1... Latent heat storage material, 2... Heat storage container, 3... Heat exchanger, 4... Horizontal fin, 5... Vertical fin, 6... Pipe,
7...Tightening and holding device, 8...Rubber packing, 9...Pipe heat transfer surface, l, x...Distance between pipe heat transfer surface 9 and the farthest latent heat storage material, a...Thermal resistance increases rapidly during solidification , the thickness of the solid phase when the heat transfer characteristics suddenly decrease, and b... the thickness of the liquid phase when the thermal resistance suddenly increases and the heat transfer characteristics suddenly decrease during melting.

Claims (1)

[Scope of Claims] 1. A hollow, sealed columnar heat storage container 2 having a tightening and holding device 7 for a through pipe 6 at the center of its upper and lower surfaces, and a filling port 10 for a latent heat storage material 1; A pipe 6 penetrates the upper and lower surfaces of the container and connects to the refrigerant pipe held by the clamping and holding device 7, and one end is fixed longitudinally on the outer peripheral surface of the pipe 6 and the other end is fixed inside the heat storage container 2. A plurality of flat plate-shaped vertical fins 5 are formed radially so as to be in contact with the side surfaces with a slight gap, and an end surface is fixed to the outer peripheral surface of the pipe 6 and the vertical fins 5 in a horizontal direction, and the other end is a heat storage container. a heat exchanger 3 having a plurality of flat horizontal fins 4 that are in contact with the inner surface of the heat storage container 2 with a slight gap and arranged at constant intervals in the longitudinal direction of the pipe 6; 1. A latent heat storage unit characterized in that a latent heat storage material having a low thermal conductivity and capable of utilizing latent heat during melting and solidification at a constant temperature is filled inside the unit. 2. The latent heat storage unit according to claim 1, wherein the inside of the heat storage container 2 is filled with coconut alcohol as a latent heat storage material that can utilize the latent heat during melting and solidification in the range of 10° to 30°C.