JPH0523979Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is a method for transferring heat between two air or liquid streams flowing inside a heat exchanger via a heat transfer medium formed inside the heat exchanger. The present invention relates to a heat exchanger configured to perform heat exchange, and particularly to a heat exchanger in which the heat transfer medium has a heat storage effect.

"Prior Art and its Problems" In general, heat exchange between an exhaust fluid to be heat exchanged (hereinafter referred to as output fluid) and a suction fluid or circulating fluid, etc. that has cold or thermal energy (hereinafter referred to as input fluid) is carried out between the two. The mainstream is the so-called sensible heat exchanger, which transfers heat through a heat transfer medium made of isolated metal or other thermally conductive material; Since the heat capacity of the medium is small, the heat exchanger becomes large. In particular, when airflow is used as the input fluid, the heat exchanger tends to become larger because the heat capacity of the input fluid itself is small together with the heat transfer medium.

Furthermore, since the heat capacity of the heat transfer medium is small, fluctuations in the amount of heat in the input fluid immediately appear as changes in the amount of heat in the output fluid, which tends to destabilize temperature fluctuations and the amount of heat exchanged. In the case of airflow, its heat capacity is small, so sufficient heat cannot be obtained on the output fluid side. Therefore, in order to supplement the amount of heat, another heat storage tank must be installed to store the necessary amount of heat. , equipment costs and installation space for providing the heat storage tank increase.

Furthermore, the sensible heat type heat exchanger has a problem in that if there is a time difference between the input fluid and the output fluid flowing in the heat exchanger, it is impossible to perform heat exchange at all. If the machine becomes inoperable even for a short period of time, the problem arises that the building cannot be cooled at all.

In view of the shortcomings of the prior art, the present invention increases the heat capacity of the heat transfer medium itself, and even if heat fluctuations occur on the input fluid side, this is absorbed by the heat transfer medium, resulting in a stable output fluid. The purpose is to provide a heat exchanger that can perform heat exchange.

Another object of the present invention is to provide a heat exchanger that makes it possible to exchange heat at different times by imparting a heat storage effect to the heat transfer medium.

Furthermore, another object of the present invention is to provide a heat exchanger which has a large heat capacity per unit pile of the heat transfer medium and is miniaturized.

``Means for Solving Problems'' In order to achieve the above-mentioned technical problem, the present invention aims to solve the above-mentioned technical problems by using a flexible structure formed by connecting a large number of flat cavities in parallel, which are formed by enclosing a latent heat storage agent. A plurality of bent sheet plates are formed by bending a flexible sheet plate into a substantially wave-shaped cross section so that the top part has a curved surface shape and extending in a certain direction to form a plurality of bent sheet plates each having a bent cavity serving as a flow path, Two types of latent heat having different melting points are laminated so that at least a part of the flat cavity of the bent sheet plate is in contact with the boundary plate with good thermal conductivity while alternately changing the heat conductivity. A heat storage agent is prepared, and one heat storage agent is arranged in the same direction in the flat cavity of a bent sheet plate, and another heat storage agent is arranged in a different direction from the above flattened sheet plate. We propose a regenerative heat exchanger characterized by each being sealed within a cavity.

"Effect" According to this technical means, since the latent heat storage agent is sealed in the wavy bent sheet plate constituting the heat transfer medium, the heat capacity of the heat transfer medium itself is increased and a predetermined heat storage effect is achieved. As a result, even if heat fluctuations occur on the input fluid side, this can be absorbed by the wavy bent sheet plate, and stable heat exchange can be performed on the output fluid side, as well as heat exchange due to time differences. I can do it.

In addition, since the heat storage in the wavy bent sheet plate is performed using a latent heat storage agent, the heat capacity per unit stack is several steps larger than that in the case of sensible heat storage, and the above-mentioned effects are further promoted. It becomes possible to downsize the container itself.

In particular, according to the present technical means, the heat storage body is formed by a wavy bent sheet plate formed by enclosing a latent heat storage agent, and the bent gap of the sheet plate is used as a flow path, so that the structure is simple and Thermal contact area with the fluid increases.

Further, the melting points of the latent heat storage agents sealed in the adjacent wavy bent sheet plates are different melting points, in other words, the melting points of the latent heat storage agents of the respective wavy bent sheet plates forming flow paths in the same direction, Since the melting point of the latent heat storage agent is set to be different from the melting point of the latent heat storage agent of the other wavy bent sheet plate in which the flow passages are formed in a different direction from the above, it is possible to smooth heat transfer and improve thermal efficiency.

That is, specifically, in the case where there is a high temperature side fluid and a low temperature side fluid flowing in the flow passages formed in different directions via the wavy bent sheet plate and the boundary plate, the first fluid flows through the high temperature side fluid. The melting point of the latent heat storage agent in the first wavy bent sheet plate is lower than the fluid temperature, while the melting point of the latent heat storage agent in the second wavy bent sheet plate through which the low-temperature side fluid flows is higher than the fluid temperature, and It is preferable to set the temperature to be lower than the melting point of the latent heat storage agent of the bent sheet plate.

Latent heat storage agents having such a desired temperature range are already known, for example, those with a melting point of -20 to -30.
℃ latent heat storage agents include inorganic or organic mixtures such as acetic acid, urea, and potassium, and latent heat storage agents with melting points of 20 to 30℃ include mixtures containing CaCl ₂ 6H ₂ O as the main component, and CaCl ₂ 6H ₂ is used as a latent heat storage agent with a melting point of 50 to 60℃.
This is a mixture containing O as a main component, and latent heat storage agents with different temperature ranges can be formed by variously changing the amounts of the components in the various mixtures.

Furthermore, according to the present technical means, the arrangement of the laminated wavy bent sheet plates is alternately different so that, for example, the flow passages through which the input fluid and the output fluid flow are formed in different directions. The introduction or discharge passage for each fluid is deviated at a predetermined angle in accordance with the position where each flow passage is formed, without erroneously mixing the fluids or forming each passage in each of the laminated wavy bent sheet plates. It suffices to simply form it, reducing assembly and equipment costs.

In particular, the present invention uses a flexible sheet plate formed by connecting a large number of flat cavities in parallel as shown in Fig. 2, and is bent into a substantially wave-shaped cross section so that the top part is curved. Since the bent sheet plate is formed, the contact portion with the boundary plate having good thermal conductivity becomes a surface contact, and the contact area is improved accordingly, and a part of the flat cavity of the bent sheet plate is particularly formed at the contact position. Since it is configured to be in contact, the heat exchange efficiency with the latent heat storage agent in the cavity is further improved.

Embodiments Hereinafter, preferred embodiments of the present invention will be described in detail by way of example with reference to the drawings. However, the dimensions, materials, shapes, relative positions, etc. of the components described in this example are as follows, unless otherwise specified.
This is not intended to limit the scope of this invention, but is merely an illustrative example.

FIG. 1 is an overall perspective view of a heat exchanger according to an embodiment of the present invention, FIG. 2 is an enlarged view of its main parts, and FIG. 3 is a partial perspective view showing the structure of a wavy bent sheet plate. A and B indicate the flow directions of the input fluid and the output fluid, respectively.

In FIG. 3, 1A and 1B are wavy sheet plates constituting a wavy bent sheet plate, which are composed of a resin coating 10 and a latent heat storage agent 20 sealed within the resin coating 10.

The resin film 10 is formed by bonding resin films facing each other at a predetermined interval in a fixed direction at predetermined intervals to alternately form flat hollow portions 11 and bent portions 12 formed between the hollow portions 11. and the cavity 11
A latent heat storage agent 20 is sealed inside.

As described above, the latent heat storage agent 20 is made of an inorganic and organic mixture such as phosphoric acid, urea, and caustic potash, or a mixture whose main component is CaCl ₂ .6H ₂ O, depending on the temperature range of the fluid to be heat exchanged. , and the latent heat storage agent between the output (high temperature side) fluid temperature and the input (low temperature side) fluid temperature flowing in each flow path 2A, 2B formed by bending the corrugated sheet plates 1A, 1B, which will be described later. Preferably, the melting point of the latent heat storage agent 20 in the second corrugated sheet plate 1B through which the high-temperature side fluid flows is set to a temperature lower than that of the fluid temperature, while the melting point of the latent heat storage agent 20 in the second corrugated sheet plate 1B through which the high-temperature side fluid flows is set to have a melting point of 20. Each of the corrugated sheet plates 1A and 1B is arranged so that the melting point of the latent heat storage agent 20 in the corrugated sheet plate 1A is higher than the fluid temperature and lower than the melting point of the latent heat storage agent 20 in the second corrugated sheet plate 1B. Select the latent heat storage agent 20 to be sealed inside.

As shown in FIG. 2, the corrugated sheet plates 1A and 1B are sequentially bent into a V-shape with the bent portion 12 as a fulcrum, and flow paths 2A and 2B are formed through which the fluid passes through the bent portion 12 in a fixed direction. Eggplant.

And the bent wavy bent sheet plate 1A, 1
B is stacked and arranged alternately by 90 degrees with each other through thin plate-shaped boundary plates 3 formed of a good thermal conductor such as an aluminum plate, and each of the above-mentioned members 1A-3-1B-3
They are integrally fixed together with adhesive.

In this case, the wavy bent sheet plates 1A, 1B and the thin plate-like boundary plate 3 are configured to contact not only the bent portion 12 but also the side end side of the flat cavity side 11 together with the bent portion 12. This is more preferable in terms of heat transfer and thermal efficiency.

Next, the operation of this embodiment will be explained.

First, an input fluid having thermal energy is introduced into the one-side flow passage 2A from the direction A, and passes through the latent heat storage agent 90 in the first corrugated sheet 1A and the upper and lower boundary plates 3 to the second corrugated sheet plate 1B. Latent heat storage is performed by transferring heat to the latent heat storage agents 20 inside and solidifying these heat storage agents 20 at the same time.

Next, by flowing the output fluid to be heat exchanged into the other flow path 2B in the B direction, heat is removed by heat exchange with the latent heat storage agent 20 in the second corrugated sheet plate 1B that is in direct contact with the fluid. and a predetermined heat exchange is performed.

Then, a cold heat source is sequentially supplied to the latent heat storage agent 20 in the second corrugated sheet plate 1B from which the heat has been absorbed from the latent heat storage agent 20 in the first corrugated sheet plate 1A, and the latent heat storage agent 20 has latent heat. Since it is a heat storage, the heat capacity is extremely large, and there is no room for temperature fluctuation of the latent heat storage agent 20 in the second corrugated sheet plate 1B, making stable heat exchange possible.

That is, according to this embodiment, even if the heat amount of the input fluid flowing in the flow path 2A in the A direction decreases or fluctuates, a large amount of heat capacity is always stored in both the corrugated sheet plates 1A and 1B, so that the input fluid flowing in the B direction distribution path 2
In addition to stabilizing the heat exchange of the output fluid flowing through B, since the heat stored in the corrugated sheet plates 1A and 1B is latent heat storage, heat exchange at a constant temperature is always possible.

In addition, the heat exchanger according to this embodiment has the following relationship: Output (high temperature side) fluid temperature - Melting point temperature of the latent heat storage agent 20 in the second corrugated sheet plate 1B - Melting point temperature of the latent heat storage agent 20 in the first corrugated sheet plate 1A - Since the input (low temperature side) fluid temperature is selected so that the set temperature becomes lower in order, the heat transfer becomes smooth and the heat exchange efficiency is improved.

Further, according to this embodiment, a stable amount of heat can be obtained even against thermal fluctuations of the input fluid and the output fluid, and the heat exchange efficiency is increased, and the heat capacity is large, so that the amount of heat supplied is large.

Furthermore, according to this embodiment, since the wavy bent sheet plate serving as the heat transfer medium has a heat storage effect, stable heat exchange can always be performed without any thermal fluctuation occurring in the output fluid even when the input fluid is interrupted or in the early stages of re-inflow. I can do it.

Furthermore, according to this embodiment, since the wavy bent sheet plate has a heat storage effect, the excess heat of the input fluid is stored in the wavy bent sheet plate at the same time as the heat exchange is performed, thereby improving thermal efficiency.

Furthermore, even if there is a variation in the amount of heat between the input fluid and the output fluid, this can be absorbed and a stable amount of heat can be obtained.

Furthermore, since the wavy bent sheet plate stores latent heat, the heat capacity to be stored is extremely large, and temperature changes can be suppressed to an extremely low level.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of a heat exchanger according to an embodiment of the present invention, FIG. 2 is an enlarged view of its main parts, and FIG. 3 is a partial perspective view showing the structure of a wavy bent sheet plate. 1A, 1B: wavy bent sheet plate, 20: latent heat storage agent, 2A, 2B: flow path, 3: boundary plate.

Claims (1)

[Scope of utility model registration request] A flexible sheet plate, which is formed by arranging a large number of flat cavities filled with a latent heat storage agent in parallel, is bent into a substantially wave-shaped cross section so that the top part is curved, and the plate is bent in a certain direction. A plurality of bent sheet plates are formed, each of which has an extending bent cavity as a flow path, and the bending sheet plates are arranged in alternately different directions, and at least one of the bent sheet plates is attached to the boundary plate through a boundary plate having good thermal conductivity. The bent sheet plates are laminated so that a part of the flat cavity part of the bent sheet plates is in contact with each other, two types of latent heat storage agents with different melting points are prepared, and one of the heat storage agents is arranged in the same direction. A regenerative heat exchanger characterized in that a heat storage agent is sealed in a cavity and in a flat cavity of another bent sheet plate arranged in a direction different from the above.