JPH06337190A - Heat accumulator - Google Patents

Abstract

PURPOSE:To improve the efficiency of a heat accumulator, employed for a heat accumulating refrigerator and the like which influence utilize heat accumulating material, and reduce the of volumetric expansion due to freezing. CONSTITUTION:A heat accumulating device is provided with a heat accumulator 15, filled with heat accumulating material, and a cooling plate for freezing the heat accumulating material while freezing heat exchange upon freezing the heat accumulator 15 is effected by contacting the cooling plate 16 with one surface of the flat plate 15b of the heat accumulator 15 through a flat surface 15a and heat exchange upon melting is effected by passing fluid between column projections 15c on the rear surface of the flat surface 15a, effecting said freezing heat exchange of the heat accumulator, in parallel to the flat surface. On the other hand, the size 15d of height of heat accumulator is a height, in which freezing can be effected by the cooling amount of accumulated heat during an arbitrary time band when a room temperature is high.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage device such as a heat storage refrigerator.

[0002]

2. Description of the Related Art In recent years, a heat storage device used in a heat storage type refrigerator or the like has been considered as disclosed in Japanese Patent Application Laid-Open No. 1-219466 from the viewpoints of effective utilization of late-night power or leveling by cutting the peak of power demand. .

An example of the conventional heat storage device described above will be described below with reference to the drawings. In FIG. 4, the regenerator 1 includes a heat exchanger tube 2 having a flat surface, two heat storage containers 3 and 4 enclosing a heat storage material, and these heat storage containers 3
It is composed of two corrugated plates 5 and 6 for partitioning 4 and 4.

The heat exchanger tube 2 which is a cooling means has two flat passages 2a and 2b facing each other through which a refrigerant flows.
It is composed of a passage 2c having a U-shaped cross section that connects these passages to each other. An inlet pipe 12 for taking in the refrigerant is provided at one end of the heat exchanger tube 2, and an outlet pipe 1 for discharging the refrigerant circulated in the heat exchanger tube 2 is provided at the other end.
3 is provided. The heat storage material containers 3 and 4 have flat surfaces 7a and 7b as heat exchange surfaces.

The corrugated plates 5 and 6 are bent in a U-shape having a recessed space for containing a heat storage container. The corrugated surfaces 5b and 6b of the corrugated plates 5 and 6 have substantially the same shape, and are in a state in which the corrugated surfaces 5b and 6b are fitted together so as to be fitted to each other, and the escape space 11 is formed in the gap between the corrugated surfaces 5b and 6b. ing. The flange portions 5a and 6a are fixed to the flat surface 8 of the heat exchanger tube 2 by brazing or fixing metal fittings (not shown).

In this structure, the inlet pipe 1 is used during heat storage.
Refrigerant is taken from 2 and circulated through the flat passage 2b, the U-shaped cross-section passage 2c, and the flat passage 2a in the heat exchanger tube 2 so that heat is exchanged on the flat surface 7a and the volume expansion due to freezing is released. Absorption by 11 and melting is performed by ventilating the whole.

[0007]

However, in the above-mentioned structure, the relief of the volume expansion during freezing is limited by the corrugated plates 5 and 6. Further, there is a problem that the heat exchange area at the time of melting is small and the heat is not efficiently radiated indirectly from the surface of the heat storage material mainly through the corrugated plates 5 and 6 or the heat exchanger tube 2.

In view of the above-mentioned problems, the present invention provides a heat storage device which enables release of volume expansion during freezing without limitation, improves the efficiency of a heat storage device, and effectively uses the heat storage energy stored in a heat storage material. The purpose is to provide.

[0009]

In order to achieve this object, the present invention provides a freezing heat exchange surface which is a flat surface as a freezing heat exchange surface for freezing one surface by being filled with a heat storage material. The back surface is provided with a heat accumulator having a plurality of protrusions as a heat exchange section for melting for melting and a cooling plate for freezing the heat storage material, and the stored heat is taken out by the heat exchanging section for melting. It is performed by passing a fluid in parallel to a plane, and the protrusion has a columnar shape or a truncated cone shape whose cross section parallel to the fluid passage direction is a circle or an ellipse, and the protrusions are arranged in a staggered arrangement or a checkerboard arrangement. The cooling plate is in contact with the freezing heat exchange surface of the heat storage material in a flat surface.

Further, the height dimension of the heat accumulator from the freezing heat exchange surface of the heat accumulator to the upper part of the protrusion is such that it can be frozen by the heat storage cooling amount in an arbitrary time zone at high room temperature.

[0011]

In the heat storage device of the present invention, the volume expansion due to freezing can be sufficiently released, and the heat exchange portion for melting directly exchanges heat on the surface of the regenerator to radiate the accumulated heat, so that the efficiency of heat exchange is improved. Well, having multiple projections increases the area of the heat exchange part for melting, and the fluid that flows in behind the projections tends to become a vortex, and the wake of the front row affects the next row and the flow is disturbed. Since the heat transfer is enhanced and the heat transfer is promoted, the amount of heat exchange is increased, which is very efficient.

Further, the height dimension of the heat accumulator from the freezing heat exchange surface of the heat accumulator to the upper part of the protrusion is set to a height at which it can be frozen by the amount of heat accumulation and cooling at an arbitrary time zone at high room temperature, so that the height can be freely adjusted throughout the year. The heat accumulator can be frozen in time.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a heat storage device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a heat storage device in one embodiment of the present invention, FIG. 2 is a refrigeration cycle diagram of the heat storage refrigerator of the same embodiment, and FIG. 3 is a sectional view showing the structure of the heat storage refrigerator of the same embodiment. Is.

In FIG. 1, 14 is a heat storage device, 15 is a heat storage device, 16 is a cooling plate, 17 is a heat exchanger refrigerant pipe through which a refrigerant flows,
Reference numeral 18 denotes a flow path wall, and arrow 19 indicates a fluid passage direction for carrying the accumulated heat.

The heat storage unit 15 has a portion surrounded by a flat plate portion 15b having a flat surface 15a as a freezing heat exchange surface, and a back surface of the flat surface 15a having a plurality of cylindrical projections 15c. Each is filled with a heat storage material. And
15d is a height dimension of the heat accumulator above the protrusion from the flat surface 15a of the heat exchange surface for freezing.

The cooling plate 16 is in contact with the heat exchanger refrigerant pipe 17 which meanders on one surface to increase the contact area, and is in flat contact with the flat surface 15a of the heat storage device on its back surface.

The flow path wall 18 is heat-insulated, has a U-shape, and both ends thereof are fixed portions 18a, 1 at both ends of the cooling plate 16.
8b is hermetically fixed so that fluid does not leak.

When the heat storage material is frozen, that is, when the heat is stored, the refrigerant is flown into the heat exchanger refrigerant pipe 17 and is exchanged with the heat storage device 15 through the cooling plate 16 to be frozen. When melting, use air arrow 1
The heat storage device 14 that is ventilated as shown in FIG.
It cools with the heat storage protrusion 15c inside.

In FIG. 2, a compressor 20 is connected to a three-way solenoid valve 22 via a condenser 21.
Further, the first outlet 22a of the three-way solenoid valve 22 is connected to the compressor 20 via a capillary 23, a cooler 24, and an accumulator 25 in this order. The second outlet 22b of the three-way solenoid valve 22 is connected to the accumulator 25 and the compressor via the heat storage device capillary 26 and the heat storage device 14 in this order.

In FIG. 3, 27 is a cooling fan, and 2 is a cooling fan.
8 is a fan for a heat storage device, and the heat storage device 14 is a freezer compartment 2.
9 and the refrigerating compartment 30 between the partition wall 31 and the air passage structure heat insulating material 3
2 is fixedly housed in the ventilation duct 32a formed by 2, and the air is sucked in from the ventilation duct inlet 32b by operating the heat storage device fan 28, so that the heat storage device 14
The air is cooled through the ventilating duct outlet 32c. That is, air is circulated as indicated by the arrow to cool the refrigerating chamber 30.

Further, the regenerator 15 in the regenerator 14 is filled with a latent heat type heat storage material, and the heat storage material can store heat corresponding to the reduced load amount in the refrigerating chamber 30 of the heat storage type refrigerator. The amount of the heat storage material is contained, and the uneven surface 15a of the freezing heat exchange surface of the heat storage device 15 in the heat storage device 14 is stored so that the heat storage material can store (freeze) heat in a limited time even at high room temperature. The area and the height 15d of the regenerator from the flat surface 15a of the freezing heat exchange surface to the upper part of the protrusion are determined.

The operation of the heat storage device used in the heat storage type refrigerator constructed as described above will be described.

During normal cooling, the three-way solenoid valve 22 is used to pass the refrigerant through the compressor 20 and the three-way solenoid valve 22 to the first outlet port 2.
It is flowed only to 2a, is routed through the capillary 23, the cooler 24, and the accumulator 25, and is returned to the compressor 20, so that the cooler 24 cools the inside of the refrigerator to a predetermined temperature.

During the heat storage utilization operation, the heat storage device fan 28
Is operated, and the return air other than the freezing chamber 29 is passed through the heat storage device 15 in the heat storage device 14 to cool the refrigerating chamber 30 by the cold heat source of the heat storage device 15. Since the heat storage utilization operation is performed during a short period of daytime power usage peak, an efficient heat storage device is required. Here, the melting heat exchange portion of the heat storage unit 15 directly exchanges heat on the surface of the heat storage unit 15 to radiate the stored heat, so that the heat exchange efficiency is good, and the plurality of cylindrical projections 15c are provided for melting. Since the area of the heat exchange section becomes large, the fluid that flows in behind the projection 15c easily becomes a vortex flow, and the wake of the front row influences the next row to strengthen the turbulence of the flow and promote heat transfer. The exchange amount is large and it is very efficient.

During the heat storage operation, that is, when the heat storage unit 15 is frozen, the refrigerant is caused to flow through the second outlet 22b by the three-way solenoid valve 22, and the compressor 20, the three-way solenoid valve 22, the capillary 26, the heat storage device 14, the accumulator. Route 25 back to compressor 20. At this time, the heat storage device 14 freezes from the heat exchanger refrigerant pipe 17 on the flat surface 15a in which the cooling plate 16 increases the freezing heat exchange area of the heat storage device 15. Since the heat exchange surface for freezing is a flat surface, the contact area is wide and the heat exchange is good. Since the portion other than the protrusion 15c of the melting heat exchange portion and the side surface of the cylindrical protrusion 15c on the rear surface of the flattened surface 15a of the freezing heat exchange surface of the flat plate portion 15b are released, escape of volume expansion due to freezing is not regulated. .

Further, since the freezing uses a time other than the normal cooling of the predetermined time at night, the freezing time is limited and the room temperature changes yearly. Therefore, the area of the flat surface 15a of the freezing heat exchange surface of the heat storage unit 15 and the height dimension 15d of the heat storage unit from the flat surface 15a to the upper portion of the cylindrical projection 15c are set to the heat storage cooling amount in an arbitrary time zone at high room temperature. By setting the height so that it can be frozen, it can be frozen throughout the year within a limited time.

[0028]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, the inside is filled with the heat storage material and one surface is a flat surface as a freezing heat exchange surface for freezing, and the back surface of the freezing heat exchange surface is melted. A heat accumulator having a plurality of protrusions as a heat exchange section for melting and a cooling plate for freezing the heat storage material are provided, and the stored heat is taken out in the heat exchange section for melting in parallel with the flat plane. The projection is in the shape of a cylinder having a circular or elliptical cross section parallel to the fluid passage direction or a truncated cone shape, and the array of projections is a staggered array or a board array, and the cooling plate Is in contact with the heat exchange surface for freezing of the heat storage material on a flat surface.

Further, the height dimension of the heat accumulator from the freezing heat exchange surface of the heat accumulator to the upper part of the projection is such that the heat accumulator can be frozen by the amount of heat accumulating and cooling in an arbitrary time zone at high room temperature. .

[Brief description of drawings]

FIG. 1 is a perspective view of a heat storage device according to an embodiment of the present invention.

FIG. 2 is a refrigeration system diagram of the heat storage type refrigerator of the embodiment.

FIG. 3 is a vertical sectional view showing the structure of the heat storage refrigerator of the embodiment.

FIG. 4 is a perspective view of a conventional heat storage device.

[Explanation of reference numerals] 14 heat storage device 15 heat storage device 15a flat surface 15b flat plate portion 15c protrusion 15d heat storage device height dimension 16 cooling plate 19 fluid passage direction

Claims (2)

[Claims] 1. A heat storage material is filled in the interior, and a flat plate portion is a flat heat exchange surface for freezing one surface and a back surface of the freezing heat exchange surface of the flat plate portion is melted. A heat accumulator having a plurality of protrusions as a heat exchange section for melting, and a cooling plate for freezing a heat storage material are provided, and the stored heat is taken out by a fluid in parallel with the flat surface in the heat exchange section for melting. The protrusion is a columnar shape whose cross section parallel to the fluid passage direction is a circle or an ellipse or a truncated cone shape, and the protrusions are arranged in a staggered arrangement or a checkerboard arrangement. The plate is a heat storage device in which the plate is in contact with the freezing heat exchange surface of the heat storage material in a flat surface. 2. The height dimension of the heat accumulator from the freezing heat exchange surface of the heat accumulator to the upper part of the protrusion is set to a height at which the heat accumulating amount can be frozen in an arbitrary time zone at high room temperature. Heat storage device.