JPH0760072B2 - Counterflow heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to indoor thermal energy by being attached to a ventilation device attached to a side wall or the like in order to make the indoor environment comfortable in a house or the like. Is a heat exchanger that has the function of suppressing the so-called indoor heat radiation loss as much as possible that is released to the atmosphere. Specifically, two fluids that should be mutually heat-exchanged, such as indoor air and outdoor air, flow in opposition. The present invention relates to a counterflow heat exchanger configured as described above.

<Prior Art> As a heat exchanger of this type, there has been known a heat exchanger of the type shown in FIG. It arranges a large number of both-end cut pipes (02A) in parallel to each other, and also extends between the disc-shaped tube plates (09) and (09) facing each other at both ends of the pipe (02A) group. The heat exchange element (0) is fixedly connected to the pipe (02A) group so that both ends of the pipe (02A) penetrate the tube plates (09) and (09) to open outward.
2) is constituted, and this heat exchange element (02) has an inlet part (05A) and an outlet part (05B) of one fluid at the center positions of both ends in the cylinder axis direction, and both ends in the cylinder axis direction. 180 close to each other
The other fluid inlet (06
A) and an outlet (06B) are housed and fixed in a cylindrical case (01), and an inlet (05A), an inner hole of a pipe (02A) group, and an outlet (05B) are provided. Fluid passage (0
5), the entrance (06A) and the pipe (02)
A) The other fluid passageway (06) is configured with an inner space (01A) of the cylindrical case (01) outside the group and an outlet portion (06B).

<Problems to be Solved by the Invention> In the heat exchanger using the pipe group as described above, the pipe groups of the fluids are arranged so that the streamlines of the two fluids intersect each other. Therefore, the effective heat exchange area can be increased and the heat exchange efficiency can be improved.

If the streamlines of the two fluids are parallel to each other or close to each other, the effect of heat exchange efficiency due to the use of the pipe group is halved. In that sense, the pipe (02
The streamline of one fluid passageway (05) including the internal hole of the (A) group and the internal space (0 of the cylindrical case (01) outside the pipe (02A) group.
1A) and the other fluid passage (06) streamline intersect, compared to a parallel counterflow configuration that uses the same number of pipe groups of the same diameter and length A large heat exchange area can be secured, and the heat exchange efficiency is correspondingly high.

However, in the above-mentioned conventional structure shown in FIG. 8, since the pipe groups are arranged in parallel with each other in a cylindrical shape and a cylindrical shape, in order to take the cross-counterflow form, one fluid The inlet part (06A) and the outlet part (06B) of the passage (06) need to be formed in the side surface of the cylindrical case (01) at positions different in phase (rotational phase) from each other, which complicates the configuration. However, when looking at the flow condition of the fluid in one of the passages (06), most of the fluid that entered from the inlet (06A) corresponding to one end in the axial direction of the pipe was found. It tends to be discharged obliquely toward the outlet portion (06B), so that the effective heat exchange area of the pipe group is as small as about one half of the total surface area of the pipe group,
There was a problem that the effect of using the pipe group was not sufficiently exerted.

<Means for Solving the Problems> The present invention has an object in view of the above circumstances, and makes it possible to maximize the heat exchange efficiency by the pipe group with a simple configuration.

In order to achieve this object, a counterflow heat exchanger according to the present invention is a heat exchange element in which a large number of both-end cut pipes are arranged close to each other and arranged in a substantially frustoconical cylindrical shape. The heat exchange element is fixed in the cylindrical case in a state where both ends of the pipe group are open at both ends of the cylindrical case in the axial direction of the cylindrical case and at both ends of the intake / exhaust section partitioned and formed outside, respectively. These pipes are positioned to form one fluid passage with the internal holes of these pipes, and the other truncated conical space surrounded by the gap formed by the pipes and the heat exchange element. A fluid passage is configured.

<Operation> When the counterflow type heat exchanger according to the present invention having the above-described configuration is used, one of the fluids to be heat-exchanged is caused to flow through one of the flow passages including the inner hole of the pipe group. By causing the other fluid to flow through the other flow path including the gap of the pipe group, both fluids flow in opposite directions with their streamlines intersecting each other, and heat exchange occurs. However, at this time, the latter fluid passes through the gap of the pipe group from substantially the entire outer peripheral surface of the substantially frustoconical tubular heat exchange element, and then the substantially frustoconical space surrounded by the heat exchange element. When it reaches, the flow of the fluid is exhibited, and by this, substantially the entire surface area of the pipe group becomes the heat exchange surface, and the efficient heat exchange action is performed.

<Example> Hereinafter, one example of the present invention will be described in detail with reference to the drawings.

1 to 5, (2A) is a double-sided cut pipe made of a material that absorbs, diffuses and transmits moisture, such as paper, plastic, cloth, etc. By arranging the books in close proximity to each other and in a generally frustoconical tubular shape, and by fixing and holding them near the ends in the axial direction of the cylinder via partition plates (10) and (10). , A heat exchange element (2) capable of exchanging both sensible heat and latent heat.

(1) is a cylindrical case having a diameter substantially equal to the maximum diameter of the heat exchange element (2), and at both ends in the axial direction of the cylinder thereof, a short cylinder in a state of being concentric with the case (1). By fixedly arranging the bodies (3) and (4), the intake and exhaust sections (3A), (3B) and (4A), (4B) are partitioned inside and outside, respectively.
Are formed. Then, the heat exchange element (2) is fixedly supported in the cylindrical case (1) in a state where both ends of the pipe (2A) group open to one intake portion (3A) and the other exhaust portion (4B). By making the pipe (2A)
With one group of fluid passages (5) having all the internal holes (2a) ... of the group, the gap (2B) formed by the group of pipes (2A) and the heat exchange element (2) The other fluid passage (6) is configured with an enclosed space (2C) in the shape of a truncated cone.

FIG. 6 shows a structure in which the heat exchanger having the above-mentioned structure is used for heat exchange between indoor air and outside air in a ventilation device to suppress heat radiation loss from the room during indoor ventilation, and the cylindrical case ( 1) One of the intake / exhaust parts (4A) / (4B) is connected to the intake / exhaust parts (4A) / (4B) by rotating in one direction via a single motor (7). A fan (8) that exerts air blows in opposite directions is connected to the internal and external double air passages (11A) and (11B).

FIG. 7 shows a modification of the above embodiment, in which the pipe (2A) group constituting the heat exchange element (2) is bent toward the axis of the cylindrical case (1) in the middle of the axis. In this case, there is an advantage that the heat exchange area can be further increased.

In the above-mentioned embodiment, the pipes (2A) group are constructed so that the density of the pipes (2A) group becomes larger on the larger diameter side of the substantially truncated cone shape as shown in FIG. The flow of fluid that flows across the outside of the can be smoothed.

In addition, as a constituent material of the pipe (2A), for example, a material having good sensible heat transfer and no latent heat transfer, such as copper, may be used.

<Effects of the Invention> As is clear from the above description in detail, the counterflow heat exchanger according to the present invention is: (1) The fluids to be heat-exchanged do not only flow oppositely in their streamline intersecting state. However, since the range of the intersecting counterflow can be made very wide in the axial direction of the pipe group, the effective heat exchange area of the pipe group is significantly larger than that of the conventional configuration described above, and the heat exchange efficiency is high. Can be significantly improved.

(2) Moreover, by making the arrangement of the pipe group into a substantially frustoconical cylindrical shape, the intake and exhaust portions of the two fluid passages are formed in the same or substantially the same plane as the inner and outer concentric shapes. Therefore, the inlet / outlet structure for the two fluids can be simplified, and the manufacturing as a whole is easy.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention, FIG. 1 is a vertical sectional side view, FIG. 2 and FIG. 3 are FIG. 1 II-II line and III
-III line view, FIG.4 and FIG.5 is an enlarged vertical side view of the main part, respectively, FIG.6 is the whole schematic vertical side view of the ventilation apparatus comprised using the heat exchanger of this invention, FIG. 8 is a vertical sectional side view showing another embodiment, and FIG. 8 is a vertical sectional side view of a conventional example. (1) is a cylindrical case, (2) is a heat exchange element, (2A) is a pipe, (3A) and (4A) are intake parts, (3B) and (4B) are exhaust parts, and (5) and (6) ) Are fluid passages, (7) is a motor, and (8) is a fan.

Claims (4)

[Claims] 1. A heat exchange element (2) is constructed by arranging a plurality of double-ended cutting pipes (2A) in a state of being close to each other and in a substantially frustoconical cylindrical shape. Each of (3A), (4A), and (4B) is an intake / exhaust section (3A), (3B), and (4A) that are formed by partitioning (2) inside and outside both ends of the cylindrical case (1) in the cylinder axis direction. One end of the pipe (2A) is fixedly positioned in the cylindrical case (1) with both ends of the pipe (2A) open to (4B), and one fluid passage (5) is formed with the internal holes of these pipes (2A). In addition, the other fluid passage (6) is provided with a space (2C) having a substantially truncated cone shape surrounded by the gap (2B) formed by the group of pipes (2A) and the heat exchange element (2). A counterflow heat exchanger characterized by being configured. 2. The pipe (2) group absorbs and dissipates moisture,
The counterflow heat exchanger according to claim 1, wherein the counterflow heat exchanger is made of a material that allows permeation. 3. The counterflow heat exchanger according to claim 1, wherein the group of pipes (2) is made of a material having no latent heat transfer. 4. The cylindrical case (1) exerts air-blowing action in opposite directions to each other on the one side of the intake and exhaust sections (4A) and (4B) by unidirectional rotation by a single motor (7). The counterflow heat exchanger according to claim 1, which is provided with a fan (8).