JPS59183291A - Heat exchanger of static type - Google Patents

Abstract

PURPOSE:To obtain a heat exchanger of static type in a miniaturized size of which heat exchanging rate is high, by largely increasing the density in the heat transfer surface area of a heat exchanger by binding a large number of hollow fibers of small diameter into a bundle and using it for a heat exchanger body. CONSTITUTION:Hollow fibers 5 housed in a container 7 are made of polyethylene, polypropylene, cellulose acetate, or the like, of which inner diameter is 0.1mm.-5mm., of which thickness is thinner the better within the range that mechanical strength can allow, and the ones of 10mum-100mum can be used practically. A resin layer 6 separates the primary gas from the secondary gas, as well as to fix the hollow fibers 5 to the container. Lids 16 and 17 having an inlet port 14 and an outlet port 15 respectively for the primary gas, passing through the hollow part of hollow fibers, are put at both ends of a container 7. The secondary gas which is fed from inlet passages 12 and 12 is fed into the cylindrical container 7 from an inlet 10 which is provided all around the other end of a cylindrical container 7, flowing along the hollow fibers through the gaps among the fibers in the longitudinal direction, and flowing out of the outlet passages 13, passing through an outlet 11 which is provided to all around one end of a cylindrical container 7. By flowing the secondary gas from the opposite direction to the primary gas- flow, a heat exchanger of static type having high heat exchanging rate can be obtained.

Description

Detailed Description of the Invention This invention relates to a ventilation system that simultaneously supplies fresh outside air and exhausts dirty indoor air, or a fresh air processing system (heat exchanger between outside air and indoor air) for an air conditioning machine room in a building, etc. ), etc., by bundling a large number of hollow fibers with a particularly small diameter, the areal density of the heat transfer surface can be greatly increased, achieving a high heat exchange rate and miniaturization of the heat exchanger. This relates to a static heat exchanger.

In recent years, as living spaces have become more insulated and airtight in order to improve heating and cooling effects, the importance of ventilation has been reaffirmed. As a way to ventilate without impairing the cooling and heating effects,
An effective method is to exchange heat between exhaust air and supply air. To meet this demand, there has been a static heat exchanger (Patent Registration No. 930986), which exchanges heat between supply air and exhaust air via a partition plate, as shown in the perspective view of FIG. A static heat exchanger has a flat partition plate (1) as shown in Figure 1.
By alternately stacking the wave-shaped spacer plates (2) and making the directions of the spacer plates perpendicular to each other every other step, a supply air flow path (3) and an exhaust air flow path (4) are formed. (a) shows the flow of air supply, and (b) shows the flow of exhaust air. At this time, it is preferable to narrow the interval between the partition plates because the number of stages increases and the heat exchange area increases, and 2 m partition plates are currently commercially available. It is preferable that the pitch of the corrugations of the spacer plates be narrower, since this increases the thermal conductivity between the airflow and the partition plates, and four pieces are currently on the market. Although this static heat exchanger cannot have supply air and exhaust air flow paths facing each other due to its structure, heat exchange efficiency is better with counterflow than with orthogonal or oblique flow. Therefore, the inventors of the present invention have developed a stationary heat exchanger that has a large area density of heat transfer area, preferably has air supply and exhaust air flow paths facing each other, and has high heat exchange efficiency and a compact heat exchanger. We conducted extensive research to develop a heat exchanger that would make this possible.

This invention was made as a result of the above objectives.

Primary gas is introduced from one end of the hollow fiber bundle with both ends sealed, leaving a hollow part, so as to pass through the hollow part, and is discharged from the other end, while passing through the gap between the hollow fibers from the other end. By introducing the secondary gas and discharging it from the one end side so as to exchange heat between the primary gas and the secondary gas, the areal density of the heat transfer area is increased and a high heat exchange rate is achieved. The purpose of this project is to provide a static heat exchanger that can be made smaller and more compact. In addition, by introducing the secondary gas from the other end side, flowing along the hollow fibers through the gaps between the hollow fibers, and discharging it to the one end side, the primary gas flow and the secondary gas flow are opposed to each other, and even higher heat is generated. The present invention aims to provide a static heat exchanger that can achieve a high exchange rate.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a sectional view showing a state in which the hollow fiber bundle is housed in a container. In the figure, (5) is a hollow fiber with an inner diameter of 0.1n to 5.
11III polyethylene, polypropylene, cellulose acetate, or the like is used. Hollow fiber (
The inner diameter of 5) is preferably smaller from the standpoint of heat transfer area or heat transfer coefficient, and is 5W! If it becomes more than L, the areal density of the heat transfer surface becomes too small, which is the limit, and if it becomes too thin, the pressure loss increases, so 0.11111 is the lower limit. The thickness of the hollow fibers (5) is preferably as thin as the mechanical strength allows, and practically, a thickness of 10 μm to 100/jm is used. (6) is a resin layer for fixing the hollow fiber (5) to the container and separating the primary gas from the secondary gas, and the resin used is polyurethane, epoxy resin, etc. that hardens at room temperature. (7) has both ends fil (91 opened and the secondary gas inlet + tg and outlet (
It is a cylindrical container provided with a 111, and since no pressure is applied to the container, a general-purpose plastic container is used. The secondary gas inlet (1α is provided with an inlet passage a 02 above and below in Figure 1, and the outlet +111 is provided with an outlet passage (1) above and below in Figure 1.
31 (131) is provided.

When manufacturing the heat exchanger of this invention, first the hollow part Hj
(After cutting 51 to a predetermined length and closing both ends of 9 by heat-sealing, process the 10111th position from both ends of 9 with resin to make it thicker. At least several thousand hollow fibers (5) with thickened both ends The bundle is stored in a container (7), and both end faces are immersed in a resin monomer solution to cure it.After curing, both end faces are cut with a cutter (at the position indicated by the dashed-dotted line in the figure) to form hollow fibers (5). The hollow part is opened.Next, the lid 061 (171) having an inlet/outlet α411151 for the primary gas passing through the hollow part of the hollow fiber is attached to both ends of the container (7) with adhesive or by cutting a thread groove. A static heat exchanger is obtained as shown in the cross-sectional view. In the figure (5) is the flow of primary gas from one end to the other end, (B
) represents the flow of secondary gas from the other end to the one end. 2
The gas passes through the gaps between the hollow fibers, and these gaps can be adjusted by adjusting the degree of thickening when both ends of the hollow fibers are treated with resin. The secondary gas that entered from the inlet passage ag (121) enters the cylindrical container (7) from the inlet fiG provided all around the other end of the cylindrical container (7), and flows through the gaps between the hollow fibers along the longitudinal direction of the hollow fibers. 1 cylindrical container (7)
The outlet (11) is provided around the entire circumference of the cylindrical container from the outlet (11) provided all around the cylindrical container. This is to realize counterflow with KL and the primary gas as much as possible so that the flow follows the longitudinal direction of the hollow fiber as much as possible.

For example, cold air from outdoors in winter is passed as a primary gas through the counterflow type static heat exchanger configured in this way.
When warm air from a heated room is passed through as a secondary gas, heat exchange takes place, and the secondary airflow is warmed and supplied into the room. In summer, a similar mechanism cools the primary airflow and supplies it into the room. Note that at this time, air may migrate between the secondary airflow and the secondary airflow, and only fresh outside air is supplied into the room.

This invention will be described below with reference to Examples and Reference Examples.

Example 1 The inner diameter is 28. A polyethylene hollow fiber (5) with an outer diameter of 2.2 m was cut into a length of 20 m, both ends of which were heat-sealed, and then soaked in a resin solution to make the fiber slightly thicker by about 1 crn from the end. Approximately 1,000 hollow tubes are bundled together to form a container (7) with a diameter of 10 cm and a length of 20 (m) as shown in Figure 2.
It was stored in. One end of the above container was immersed in a petri dish containing a polyurethane stock solution to a depth of about 2 cIrL, and was allowed to harden at room temperature for 1 hour. The other end was hardened in the same way.

The hollow part of the hollow tube was opened by cutting with a cutter at a distance of 1 cIrL from the end surface. Next, as shown in Fig. 3, a counter-flow type static heat exchanger was fabricated by bonding a lid QQ (171) made of brass material with an adhesive to form an air inlet and an outlet on both end faces.

Example 2 The inner diameter is 1. A polypropylene hollow fiber (5) with Q m and an outer diameter of 1.2 cm was cut into a length of 20 cm, both ends were heat-sealed, and the fiber was made slightly thicker at 1α from the end. Approximately 5,000 of these hollow fibers were bundled and housed in a container (7) having a shape as shown in FIG. 2 and having a diameter of 10 cm and a length of 20 cm.

One end of the container was immersed in a petri dish containing a polyurethane stock solution to a depth of about 2σ, and the solution was cured at room temperature for 1 hour. The other end was hardened in the same way. The hollow portion of the hollow fiber was opened by cutting with a cutter at 11 points from the end face. Next, as shown in FIG. 3, a counter-flow type static heat exchanger was fabricated by bonding a plastic lid (161 (19) with an adhesive to form an air inlet and an outlet on both end faces.

Example 3 A cellulose acetate hollow fiber (5) with an inner diameter of 9.5 m and an outer diameter of 0.6 m was cut into a length of 20 crrL, and both ends were heat-sealed and the ends were made slightly thicker. Approximately 5,000 of these hollow fibers are bundled together to create a shape with a diameter of 5 mm as shown in Figure 2.
It was stored in a container (7) with a length of 20 cm. depth 2cI
One end of the container was immersed in a Petri dish containing an IL-sized polyurethane stock solution and allowed to harden at room temperature for 1 hour. The other end was hardened in the same way. The hollow portion of the hollow fiber was opened by cutting with a cutter at a point 11111 from the end face. Next, as shown in FIG. 3, a counter-flow type static heat exchanger was fabricated by bonding plastic covers forming air inlets and outlets on both end faces with adhesive.

Reference example basis weight 801/rr? , 9 tsubo weight too p/rr? using paper with a thickness of 0.1 as a partition plate. A cross-flow type static heat exchanger having the structure shown in FIG. 1 was fabricated using kraft paper with a thickness of 015 fins as a spacer plate. However, the spacing between the partition plates is 2wm.

The pitch of the spacer plates is 4+++@bound, and the spacer is a cube with a negative side of 15 cm.

The ventilation cross-sectional area of the static heat exchanger obtained in the above examples and reference examples 2 Ventilation path length (effective length of the ventilation path that allows heat exchange between the negative and secondary gases), the volume of the element (ventilation cross-sectional area (ventilation path length), heat transfer area (represents the effective area for heat exchange; in the case of hollow fibers, the heat transfer area was calculated using the average diameter of the outer diameter and inner diameter), and the areal density of the heat transfer area. Table 1 shows the obtained results.
．． Shown below.

Table 1 As is clear from Table 1, the areal density of the heat transfer area is 2 to 10 times greater in the Examples than in the Reference Examples. Next, in order to measure the heat exchange efficiency, the temperature of the primary gas is 1.
Air at 0° C. was passed through air at a temperature of 25° C. as a secondary gas, and the outlet temperature (θl) of the primary gas and the outlet temperature (θ2) of the secondary gas were measured and calculated from a linear equation.

Or 5-02 Heat exchange efficiency = -, ---- Since there are some differences between the values, the average value was calculated. In order to make the measurement conditions the same, in the case of the reference example, the air volume of the primary gas and secondary gas was set to 100 r+? /h
In the case of the example, an air volume proportional to the ventilation cross-sectional area was passed through. Table 2 shows the average values of air volume and heat exchange efficiency.

Table 2 As is clear from Table 2, the average heat exchange efficiency obtained in the examples of the present invention is superior to 80% or more, compared to 75 in the reference example. From the measurement results of the average heat exchange efficiency, in the case of a counter-flow type, an area density of the heat transfer surface of about 800 or more is sufficiently effective. As the inner diameter of the hollow fiber becomes smaller, the pressure loss increases, so it is practically preferable that the inner diameter is one stroke or more.

The static heat exchanger according to this invention has a unique structure.

It is not limited to a cylindrical shape, but can also be a rectangular parallelepiped.

In particular, the performance of the heat exchanger does not change even if the shape of the ventilation cross section is a narrow rectangle, so it is possible to reduce the thickness required for modern ventilation equipment, and the heat exchanger container can be used as a blower or a blower duct. It is also possible to integrate them, which is highly effective in making ventilation equipment thinner and smaller.

As explained above, according to the present invention, primary gas is introduced from one end of the hollow fiber bundle whose both ends are sealed, leaving a hollow part, so as to pass through the hollow part, and is discharged from the other end. , by introducing secondary gas from the other end side so as to pass through the gap between the hollow fibers and exhausting it from the one end side, thereby exchanging heat between the primary gas and the secondary gas,
Since the areal density of the heat transfer area can be increased, it is possible to provide a stationary heat exchanger that can achieve a high heat exchange rate and be compact. Further, by introducing the secondary gas from the other end side, flowing through the gaps between the hollow fibers along the hollow fibers, and discharging it to the one end side, the primary gas flow and the secondary gas flow can be made to oppose each other. Therefore, a stationary heat exchanger with an even higher heat exchange rate can be provided.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of a conventional cross-flow type static heat exchanger, and FIGS. 2 and 3 are cross-sectional views showing a counter-flow type static heat exchanger according to an embodiment of the present invention. , FIG. 2 shows the state in which the hollow fiber bundle is housed in the container during the manufacturing process, and FIG. 3 shows the completed state. In the figure, (1) is a partition plate, (2) is a spacing plate, (3)
is a supply air flow path, (4) is an exhaust flow path, (a) is a supply air flow, (b) is an exhaust flow, (5) is a hollow fiber, (6) is a resin layer, (7) is the container, +11+111 is the secondary gas inlet and outlet, 111fls is the primary gas inlet and outlet, and 111 is the lid. (A) represents the flow of primary gas, (yen represents the flow of secondary gas. In each figure, the same reference numerals represent the same or equivalent parts. Agent Shin Kuzuno - Procedural correction officer (self-motivated) 58 7 15 1. Indication of the case Japanese Patent Application No. 58-56736 2. Title of the invention: Static heat exchanger 3. Relationship with the case of the person making the amendment. Patent applicant residence: M. 2-2-3 Marunouchi, Chiyoda-ku, Tokyo. 2nd name (601) Mitsubishi Tanuki Co., Ltd. Representative Minister Hitoshi Yama Department 4, Generation J! 11 Resident Qi 2-2 Marunouchi, Chiyoda-ku, Tokyo '415
No. 3 No. 5, Claims of the specification to be amended and detailed description of the invention Pack 6, Contents of the amendment (11 The claims of the specification are corrected as shown in the attached sheet. (2) Description of the specification "Thermal conductivity" on page 3, line 8 is corrected to "heat transfer coefficient." (3) "Paper manufacturing" on page 9, line 14 of the same page is corrected to "1 厭." 7. Amend the attached documents. 1 or more documents stating the scope of subsequent patent claims Claims + 11 A hollow fiber bundle whose both ends are sealed leaving a hollow section in which a primary gas is introduced from one end to pass through the hollow section, and other At the same time, secondary gas was introduced from the other end so as to pass through the gap between the hollow fibers, and was discharged from the one end, thereby exchanging heat between the primary gas and the secondary gas. Static heat exchanger. (2. In the thing described in claim 1. The secondary gas introduced from the other end side flows through the gap between the hollow fibers along the longitudinal direction of the hollow fibers. A static heat exchanger configured to discharge side force ν. A static heat exchanger having a diameter of 10 μm to 100 μm. (4) In the product according to any one of claims 1 to 3, the hollow fiber material is polyethylene, polypropylene, or cellulose acetate. A static heat exchanger. 430-

Claims (1)

[Claims] (1) A primary gas is introduced from one end of the hollow fiber bundle with both ends sealed leaving the hollow part so as to pass through the hollow part,
The secondary gas is discharged from the other end, and the secondary gas is introduced from the other end side so as to pass through the gap between the hollow fibers, and is discharged from the one end side, thereby exchanging heat between the primary gas and the secondary gas. static heat exchanger. (2. In the item described in claim 1, the secondary gas introduced from the other end side flows through the hollow fiber gap along the longitudinal direction of the hollow fibers and is discharged from the one end side. (3) In the static heat exchanger according to claim 1 or 2, the hollow fiber has an inner diameter of 0.1 mm to 9.5 wm and a wall thickness of 10 μm to 100 μm. (4) Percentage Permissible In the device according to any one of claims 1 to 3, the hollow fiber material is polyethylene, polypropylene, or cellulose acetate. vessel.