JPS62178893A - Heat exchanger - Google Patents

Abstract

PURPOSE:To make it possible to reduce the static pressure loss while holding the entire external dimension and the heat exchange efficiency as it is, by integrally forming smoothening fins on one surface of a plate, enlarging as large as possible the mutual interval P between smoothening fins in a specific range with respect to the height H thereof within a specific range, and vertically laminating unit heat exchange members thus constituted. CONSTITUTION:The mutual interval P of smoothening fins 3 integrally formed on a plate 2 is set so that P/H (H: the height of fins 3) is in a range of 3.0-10.0. Thus, it is possible to reduce the static pressure loss by 10% to 60% as compared with the conventional heat exchanger in the case of P/H=1.0-2.5, and also the quantity of a material for smoothening fins when the heat exchange efficiency is the same can be reduced. Further, the smoothening fins and the plate may be constituted of a material having a heat transfer property and a moisture permeability and the connecting surfaces of both the fins and the plate may be reinforced by expansion or use of connecting plates.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a plate-fin type heat exchanger having a vertically stacked structure, and in particular, it relates to a plate-fin type heat exchanger having a vertically laminated structure, and in particular, to a plate-fin type heat exchanger that maintains the overall outer dimensions and heat exchange efficiency as is. This is designed to reduce static pressure loss in the air flow path between the rectifier fins.

[Conventional technology]

Plate-fin type heat exchangers have a large heat transfer area per unit volume, and are widely used as relatively small and highly efficient heat exchangers. From countercurrent type to countercurrent type.

They can be divided into three types: orthogonal (oblique) meteors.

The air-to-air heat exchangers used in air conditioners are usually of the counterflow type or the crossflow type, but until now their basic configuration has been based on two types of heat exchangers, as shown in Figure 8.
A plate (10) for partitioning two fluids is sandwiched between corrugated plate-shaped rectifying fins (102) constituting multiple rows of parallel flow channels. As shown in Fig. 9, the plate (10) is made of a paper material based on Japanese paper that has both heat conductivity and moisture permeability, and the rectifying fin (102) is also made of a plate (10).
It is obtained by processing a similar paper material into a corrugated board. However, manufacturing such corrugated rectifying fins requires many steps and has poor productivity.

Another configuration is as shown in Fig. 10, in which two flat rectifying fins (3) are placed in an upright position.
) A unit heat exchange member formed integrally with the heat exchange member sandwiched between the parts.[4] A unit heat exchange member formed by stacking multiple pieces vertically, or a flat rectifying fin (3) on one side of a flat plate (2) as shown in Fig. 11.
There are unit heat exchange members 14) which are integrally molded in an upright state and which are stacked vertically.

In all cases, the ratio of the height H of the rectifying fins (3) to the distance P between the rectifying fins was within the range of 1.0 to 2.5.

This is done in order to make the finished heat exchanger more compact.
In addition to increasing the area of the rectifier fins to increase the heat transfer area per unit volume, in the case of the corrugated rectifier fins shown in Figure 9, this is to stabilize the rising angle of each rectifier fin against the load from above. In the case of the rectifying fins shown in FIGS. 10 and 11, this was also done to prevent each of the rectifying fins from falling down in the stacked state.

[Problem that the invention seeks to solve]

As mentioned above, in conventional heat exchangers, the area of the rectifier fins is increased by 1% in order to make the whole compact. , and as a result, there was a problem that the size became large.

This invention was made in order to eliminate the above-mentioned conventional problems, and by optimizing the shape of the flow path between the rectifier fins in the heat exchanger, the overall external dimensions and heat exchange efficiency can be maintained. The purpose is to reduce static pressure loss.

[Means for solving problems]

In the case of this invention, the rectifying fins are integrally molded on one side of the plate, and the distance P between the rectifying fins is equal to the height H.
When a heat exchanger is constructed by stacking unit heat exchange members configured in this way in the vertical direction, each To prevent the rectifier fins from collapsing due to loads from above, especially when the unit heat exchange member is made of resin, the connection surface between the rectifier fins and the plate is reinforced by enlarging or by using a connecting plate.

[Effect]

In the case of this invention, the distance P between the rectifier fins is the height H
Since P/H is set within the range of 3.0 to 10.0, the static pressure loss in the air flow path between the rectifier fins is relatively small, and heat exchange is possible. The outer shape and heat exchange efficiency of the entire container can be maintained as they are.

〔Example〕

An embodiment of this invention will be described below. That is, FIG. 1 is a basic model for experiments on the heat exchanger of the present invention. Regarding this model, the heat exchanger [11], the height H of the rectifying fins and the distance P between the rectifying fins were variously changed. We conducted an experiment. The second one shows the unit heat exchange member in this case.

In this figure 2, the thickness of plate (2) is 0.
1 mm 5 Height Hf of rectifying fin (3): 2.9 mW, both the plate and the rectifying fin are made of resin.

FIG. 3 shows the experimental results when the air flow rate was set to 1000 m''/h and the distance P between the rectifying fins was varied.

As is clear from Fig. 3, when P/H' (z is changed from 1.0 to 20.0, the heat exchange efficiency ηt is P
/H is 1.0 to 2. When it is OK, it decreases rapidly, but 1)
/H hardly changes from 3.0 to 20.0. On the other hand, the static pressure loss △P decreases as p/g increases, but when P/H exceeds 4.0, the decreasing trend becomes gradual.9. When P/H is 10.0 or more, the decrease is small.

Based on these conditions, the height H of the rectifier fins is determined so that the heat exchange efficiency ηt is 69% when the air flow rate is 1000 m''/h in the heat exchanger having the external dimensions shown in Figure 1.
FIG. 4 shows the changes in heat exchange efficiency ηt and static pressure loss ΔP with respect to the amount of air to be processed when the distance P between the rectifying fins is changed. As is clear from this figure, the heat exchange efficiency ηt is g
72% at oo//h.

60 o'/h Tare 5%, 400'/h Tae 8
0%.

It shows exactly the same characteristics as 86% at 200'/h.

On the other hand, it can be seen that the static pressure loss decreases rapidly until P/H reaches 3.0, but then decreases slightly until p/H reaches 20.0.

On the other hand, in FIG. 5, the external dimensions of FIG. 1 are given to the conventional heat exchanger with the wave rectifying fin structure shown in FIG.
It shows the static pressure loss when P/H=2.0 when the efficiency ηt at the processing air amount of'/h is 69%.

As is clear from the comparison between Fig. 4 and Fig. 5, the heat exchanger employing the conventional corrugated rectifying fins.

Compared to the system of this invention, when the P/H is small, the static pressure loss is low, but in the case of wave rectifying fins, the P/H is only about 1.0 to 2.5 due to the structure. Therefore, it is practically impossible to achieve low static pressure loss.

By the way, in order to achieve low static pressure loss in a heat exchanger with corrugated rectifying fins when P/H is 2.5, P/H must be 3.
．． It is sufficient to use the unit heat exchange member shown in FIG.
'h processing air amount △P-8, 2m*Aq
10.7mmA in case of conventional wave rectifier fins
It becomes possible to reduce the static pressure loss to 16.6% when viewed from q.

Furthermore, P/H=1 in the unit heat exchange member having the shape shown in FIG. 10 or 11. Compared to Q~2.5, the static pressure loss is 58% when P/H=3.0 and P/H=1.0, and when P/H=10.0, P/H= This can be reduced to 65.6% of the case of 2.5, and the third
As is clear from the figure, when the p/H is 3.0 or more, there is no decrease in heat exchange efficiency, so there is no need to increase the number of unit heat exchange members stacked to obtain the same heat exchange efficiency. Also, by taking the distance p'1 between the rectifying fins,
The number of required rectifying fins is reduced accordingly, and the heat exchanger can be manufactured at low cost.

From the above, it seems that the larger the distance between the rectifying fins, the better, but when actually configuring and using it as a heat exchanger, the plate material (resin 1 paper, metal thin plate) and plate thickness 0.05g1~0.3n)
and operating conditions (pressure is 200 A for air-to-air heat exchangers)
(up to q), if it is too large, deformation due to the pressure in the space between the plates is likely to occur, and the maximum P/H is 9% or less than 20. If resin or paper is used as the material, P/H It is best to set H to about 10 at maximum.

In the case of the embodiment shown in Fig. 2, the connecting surface between the rectifying fins (3) and the plate (2) is reinforced by enlarging it because the plate material is made of resin, but if the plate is made of metal etc. This is not necessary and may be configured as shown in FIG. Further, the same effect can be obtained when the rectifying fin structure of the present invention is applied to a heat exchanger formed by stacking unit heat exchange members as shown in FIG. can get.

In addition, as shown in Fig. T, a connecting plate (5) may be inserted between the ends of the rectifying fins (3) to reinforce the connecting surface with the plate (2).

〔Effect of the invention〕

In the heat exchanger of this invention, the mutual spacing P of the rectifying fins integrally formed on the plate is P/H=
Since it is set within the range of 3.0 to 10.0, p/u=t in the conventional one.

It is possible to reduce static pressure loss by 10% to 60% compared to a heat exchanger with a heat exchanger of ~2.5, and the material of the rectifier fins can also be reduced for the same heat exchange efficiency, resulting in a low-cost solution. It also has the effect of being able to provide products.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a heat exchanger of this invention, and FIG. 2 is a side view showing a unit heat exchange member of this invention. Figure 3 shows P/H when the height H of the rectifier fins is constant.
4th diagram showing the relationship between heat exchange efficiency ηt and static pressure loss ΔP
The figure shows changes in static pressure loss due to changes in p/H when the heat exchange efficiency is the same. Figure 5 shows a corrugated plate with the same external dimensions as Figure 1 and the same heat exchange efficiency as Figure 4. Heat exchanger employing rectifying fins FIG. 8 is a perspective view showing a conventional example, and FIGS. 9, 10, and 11 are side views showing conventional unit heat exchange members. In Figure 9, flll is a heat exchanger, (2) is a play), +3
Reference numeral 1 indicates a rectifying fin, (4) a unit heat exchange member, and (5) a connecting plate.

Claims (3)

[Claims] (1) Unit heat exchange members made by integrally molding rectifying fins on one side of a heat-conductive flat plate are stacked vertically in multiple rows, and heat is exchanged in flow channels partitioned by the plates. In a device in which air-to-air heat exchange is performed by passing two air streams alternately layer by layer, when the height of the rectifying fins is H and the interval between the rectifying fins is P, P
A heat exchanger characterized in that /H is set within a range of 3.0 to 10.0. (2) The heat exchanger according to claim 1, wherein the rectifying fins and the plate are made of a material having heat conductivity and moisture permeability. (3) The heat exchanger according to claim 1, wherein the rectifying fins and the plate are made of resin, and the connecting surfaces of both are reinforced by expansion or by using a connecting plate.