JPH0972687A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend the interval of a heat exchange medium supply and stop cycle of temperature control and to alleviate the surface temperature change of a heat exchanger in the exchanger for heat exchanging the medium with the outdoor air. SOLUTION: The heat exchanger comprises a body 2 having a plurality of heat exchange medium passages 5 provided in parallel via a coupling part 6, and corrugated fins 7 provided on the surface of the body 2. A container 8 for containing a heat storing (cold storing) medium is connected to each part 6 and provided inside the protrusion 7b of the fin 7.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a heat exchanger using a heat exchange medium such as hot water or cold water.

[0002]

2. Description of the Related Art Conventionally, a heat exchanger using a heat exchange medium such as hot water or cold water has been widely used for heating or cooling. This type of heat exchanger has a main body in which a plurality of elongated heat exchange medium passages communicating between an inlet portion and an outlet portion of the heat exchange medium are arranged in parallel via a connecting portion, and has a parallel uneven surface. It is known that a corrugated fin is attached to the main body so that the concave portion is located in contact with the surface of each heat exchange medium passage and the convex portion is located apart from the surface of each coupling portion. In the heat exchanger, the heat exchange medium flowing from the inlet portion flows through the plurality of heat exchange medium passages and flows out from the outlet portion, directly with the surface of the heat exchange medium passage, or through the connecting portion and corrugated fins. The heat is indirectly exchanged with the outside air. That is, when a heat medium such as hot water is used as the heat exchange medium, the outer air is warmed, and when a refrigerant body such as cold water is used, the outer air is cooled so that heat is exchanged by radiation or convection. . The corrugated fins are provided to enhance the heat exchange efficiency.

When a room such as an air conditioner is heated or cooled using such a heat exchanger, automatic control is often performed to maintain the room temperature within a predetermined range. For example, a temperature sensor such as a thermistor detects the room temperature, and the temperature controller controls the opening / closing valve provided in the heat exchange medium supply pipe to open / close according to the signal. In addition, by using low-priced late-night power, the heat exchange medium is heated by a heating device at night and stored in a heat storage tank (or cooled by a cooling device and stored in a cold storage tank), which is used as a heat exchanger in the daytime. It is also being supplied.

[0004]

However, in the conventional heat exchanger, when the on-off valve of the supply pipe is opened and closed as described above,
The heat radiation (or cooling) action of the heat exchanger changes relatively quickly. That is, since the heat capacity of the heat exchange medium staying in the heat exchanger is generally small, the temperature of the heat exchange medium in the heat exchanger rapidly increases when the supply of the heat exchange medium is stopped by closing the on-off valve. When the heat release (or cooling) action is approached, and the open / close valve is opened to start supplying the heat exchange medium, the temperature of the heat exchange medium in the heat exchanger rises rapidly (when it is the heat medium). Or it descends (when it is a refrigerant body). When the temperature control is performed by the heat exchanger having such characteristics, the on-off valve is opened and closed frequently, which causes a problem that the on-off valve fails and the life is shortened. Furthermore, the temperature change in the heat exchanger is rapid, which is not preferable in terms of life. Further, when the heat exchange medium heated at night by using the midnight power is stored in the heat storage tank, it is necessary to specially install a heat storage tank having a relatively large capacity therefor.
(The same applies when cooling the cooling medium by using midnight power)
Then, this invention makes it a subject to provide the heat exchanger which solves these conventional problems.

[0005]

That is, the present invention provides a main body in which a plurality of elongated heat exchange medium passages communicating between an inlet portion and an outlet portion of a heat exchange medium are provided in parallel with each other via a connecting portion. And a corrugated fin that is mounted on the main body by disposing the concave portion on the surface position of each heat exchange medium passage and the convex portion on the surface position of each connecting portion.
A plurality of elongated accommodating portions for accommodating the heat storage medium or the refrigerant storage body are provided inside the convex portions of the corrugated fins in contact with the respective connecting portions. In a preferred embodiment of the above heat exchanger, a plurality of accommodating portions are formed by the projections by arranging the plate material having a plurality of parallel elongated recesses in contact with the surface of the heat exchange medium passage. . As a result, the heat transfer coefficient between the housing portion and the connecting portion is improved, and the housing portion can be manufactured with a small amount of material and a good sealing property.

[0006]

As described above, in the heat exchanger of the present invention, a plurality of elongated accommodating portions for accommodating the heat storage medium or the refrigerant storage medium are provided inside the convex portions of the corrugated fins in contact with the connecting portions of the heat exchanger body. Therefore, while the heat exchange medium is being supplied to the heat exchange medium passage to perform heat exchange with the outside air, heat exchange is also performed between the heat exchange medium and the heat storage (or cold storage) medium in the accommodating portion. The temperature of the housing changes according to the temperature of the heat exchange medium passage. Then, when the on-off valve is closed, the action of radiating or releasing the heat from the heat storage (or cold storage) medium in the accommodating portion is continued in cooperation with the heat exchange medium in the heat exchange medium passage, so that the action changes gently. Further, when the on-off valve is opened, the heat exchange action as described above is performed between the heat exchange medium in the heat exchange medium passage and the heat storage (or cold storage) medium in the accommodating portion. The cooling action changes slowly.

As described above, the change in the heat radiation or cooling effect of the heat exchanger due to the opening / closing of the opening / closing valve becomes gradual, so the opening / closing frequency of the opening / closing valve by the temperature control becomes gradual. Therefore, the life of the on-off valve is extended and the occurrence of failure is reduced. Furthermore, the temperature change inside the heat exchanger becomes gentle. Further, according to the heat exchanger of the present invention, it is possible to heat the heat storage medium in the accommodating section at night by using the midnight power and use it in the daytime, so that the heat storage tank is specially installed as in the conventional case. No need. The same applies to the cold storage tank.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded view of an example of the heat exchanger of the present invention, a perspective view showing a part of the heat exchanger, and FIG. 2 is a front view showing the heat exchanger of FIG. 1 assembled and partly broken. 3 is a plan view showing the heat exchanger of FIG. 1 assembled and partly broken, FIG. 4 is a side view of FIG. 2, and FIG. 5 is a sectional view of FIG. In FIG. 1, the heat exchanger 1 includes a main body 2, a pair of corrugated fins 7 having a plurality of recesses 7a and protrusions 7b formed in parallel alternately in a trapezoidal shape, and a plurality of heat storage mediums or refrigerant storage bodies. And a pair of plate members 9 that form the elongated accommodating portion 8 of FIG. Body 2
Is an inlet portion 3 and an outlet portion 4 of the heat exchange medium, and a plurality of elongated heat exchange medium passages 5 which are arranged in parallel and communicate with each other.
And a plurality of connecting portions 6 for connecting between the heat exchange medium passages 5. Each of these parts is made of a press-molded body such as an aluminum alloy plate, a copper plate, or a stainless steel plate that is commonly used in this field. Furthermore, the heat exchanger 1 is
A pair of mounting members 10 for mounting it on a wall surface, etc.
It has. This mounting member 10 is constructed by bending both ends of a plate into a substantially U-shape and providing two mounting holes 10a in the middle thereof, and the both ends are fixed to the main body 2 by brazing, soldering, welding or the like. To be done.

In the main body 2, a pair of plate members provided with a plurality of parallel concave portions other than the peripheral portion thereof are arranged to face each other, and the periphery and the concave portions are liquid-tightly joined by brazing or the like and assembled as shown in FIG. To be The diagonal inlet 3 and outlet 4 form a pipe connecting boss, which is communicated with the inside. The recesses are in close contact with each other to form the connecting portion 6, and the portions between the connecting portions 6 are separated from each other to form the heat exchange medium passages 5. And each heat exchange medium passage 5
Both ends of each are communicated with the inlet portion 3 and the outlet portion 4 via orthogonal passages. A pair of plate members 9 forming the accommodating portion 8 are arranged so as to face each other with the main body 2 sandwiched therebetween, and their peripheral edges and concave portions are liquid-tightly joined to both surfaces of the main body 2 by brazing or the like. Then, cylindrical bosses are formed at the four corners to form the supply / discharge port 13 for the heat storage medium or the heat storage medium. Further, the corrugated fins 7 have a wave concave portion 7a joined to the concave portion of the plate member 9 by brazing or the like.

2 to 5, in the assembled heat exchanger 1, a large number of elongated heat exchange medium passages 5 and connecting portions 6 are alternately formed in parallel, and a pair of plate members 9 are superposed on both outer sides thereof. A plurality of elongated accommodating portions 8 that are parallel to each other are formed. Each accommodation portion 8 is formed by the space surrounded by the inner surface of the convex portion of the plate material 9 and the surface of the connecting portion 6, and the concave portion of the plate material 9 is in contact with the surface of the heat exchange medium passage 5. In this way, the accommodating portion 8 contacts the connecting portion 6, and the recesses of the plate members 9 on both sides thereof contact the surface of the heat exchanging medium passage 5, so that the heat exchanging medium in the heat exchanging medium passage 5 and the accommodating portion 8 Good heat transfer is obtained between the heat storage medium or the heat storage medium,
In addition, the overall thickness is thin and has a compact structure.
As shown in FIG. 3, the pair of corrugated fins 7 are arranged so as to sandwich the outside of each plate member 9. Each of the concave portions 7a of the corrugated fin 7 is arranged in contact with the surface of the heat exchange medium passage 5 via the convex portion of the plate material 9, and the accommodation portion 8 is arranged inside each of the convex portions 7b.

[0011]

EXAMPLES The above-mentioned heat exchanger 1 according to the present invention and a conventional heat exchanger were respectively used for indoor heating to control the temperature. All the heat exchangers used had the same shape and size of the main body and corrugated fins, and the horizontal and vertical dimensions of the main body were 200 mm, 300 mm and 30 mm in thickness.
The distance between the convex portions (wave crests) of both corrugated fins is 80 mm. And CaCl ₂ + 6H as heat storage medium
_{The 2} O solution was enclosed. In each of the heat exchangers, hot water at 80 ° C. was supplied as a heat exchange medium at 0.01 m ³ / min, and the electromagnetic on-off valve provided in the supply pipe was controlled to open and close by the temperature controller. FIG. 6 shows the opening / closing cycle of the opening / closing valve opened / closed to maintain the temperature constant and the surface temperature change of the heat exchange medium passage. In the figure, the solid line shows the result of the heat exchanger of the present invention, and the dotted line shows the result of the conventional heat exchanger. As is clear from this figure, the heat exchanger of the present invention has a longer opening / closing cycle interval of the opening / closing valve and a smaller surface temperature change of the heat exchange medium passage than the conventional one.

[0012]

According to the heat exchanger of the present invention configured as described above, the control cycle interval of the on-off valve by temperature control becomes longer and the surface temperature change of the heat exchange medium passage becomes gentle. Therefore, the life of the on-off valve is extended and the occurrence of failure is reduced. Furthermore, since the temperature change inside the heat exchanger becomes gentle, it also has a good effect on the life of the heat exchanger. Further, according to the heat exchanger of the present invention, it is possible to heat the heat storage medium in the accommodating section at night by using the midnight power and use it in the daytime, so that the heat storage tank is specially installed as in the conventional case. You don't have to. (The same applies when cooling the cooling medium by using midnight power)

[Brief description of drawings]

FIG. 1 is a perspective view in which an example of a heat exchanger of the present invention is disassembled and a part thereof is broken away.

FIG. 2 is a front view showing the heat exchanger of FIG. 1 assembled and partially cut away.

FIG. 3 is a plan view showing the heat exchanger shown in FIG. 1 assembled and partially cut away.

FIG. 4 is a side view of FIG. 2;

FIG. 5 is a sectional view of FIG. 4;

FIG. 6 is a diagram showing a temperature control result of a heat exchanger, in which a solid line is a heat exchanger of the present invention and a dotted line is a curve of a conventional heat exchanger shown for comparison.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 heat exchanger 2 main body 3 inlet part 4 outlet part 5 heat exchange medium passage 6 connecting part 7 corrugated fin 7a concave part 7b convex part 8 accommodating part 9 plate material 10 mounting member 10a mounting hole 13 supply / discharge port

Claims (2)

[Claims] 1. A main body 2 in which a plurality of elongated heat exchange medium passages 5 communicating between an inlet portion 3 and an outlet portion 4 of a heat exchange medium are provided in parallel with each other via a connecting portion 6, and a recess 7a. A heat exchanger comprising: a corrugated fin 7 which is mounted on the main body 2 by disposing a convex portion 7b at a surface position of each heat exchange medium passage 5 at a surface position of each connecting portion 6, and a heat storage medium or a cold storage medium. A heat exchanger characterized in that a plurality of elongated accommodating portions (8) for accommodating a medium are provided inside the convex portions (7b) of the corrugated fins (7) in contact with the respective connecting portions (6). 2. The heat exchanger according to claim 1, wherein a plurality of the accommodating portions 8 are formed by positioning the recesses of the plate member 9 having a plurality of parallel elongated recesses in contact with the surface of the heat exchange medium passage 5. .