JPH04106396A - Manufacture of element for total heat exchanger - Google Patents

Abstract

PURPOSE:To obtain total heat exchanging efficiency, satisfactory economically, by a method wherein the specified amount of particles of adsorbing type moisture absorbing agent are fixed to the surface of the sheet of an adhesive agent layer and the sheet is formed so as to have specified configuration of corrugate sheet while the corrugate sheet and the plane sheet are laminated alternately to form an element having a multitude of small through holes. CONSTITUTION:The particles of adsorption type moisture absorbing agent are fixed to the front and rear sides of a sheet, made of a metal, plastic or the like having the thickness of 20-100mum, with the rate of total 6-15g per the surface area 1m<2> of the front and rear sides of the sheet and the sheet is corrugated so as to have the wave length of 2.5-5mm and the height of wave of 1.0-2.6mm while flat sheets and the corrugate sheets are laminated alternately to form an element having a multitude of small through holes. Polyvinyl acetate adhesive agent 2 is applied on both sides of an aluminum sheet 14 having the thickness of 60mum, for example, with rollers 15, whose gap is regulated, and the adhesive agent is dried halfly by a drying heater 3, then, the sheet is introduced into a chamber 9 to spray the jet stream of the particles of silica gel having the grain size of 100mum or less against both sides of the sheet and fix them to both sides of the same, then, the adhesive agent is dried perfectly by a drying heater 11 and, further, high-temperature baking is effected through a drier 13.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a method for manufacturing a total heat exchanger element, which is formed by attaching moisture absorbent particles to a sheet of metal, plastic, etc. and forming it into a honeycomb shape. .

Prior art The applicant of the present patent disclosed in Japanese Patent Publication No. 19302/1983 that adhesive is applied to the surface of a metal sheet or plastic sheet that has been previously coated with an anticorrosive coating, and particles of a non-deliquescent moisture absorbent are added to a portion of the surface of the metal sheet or plastic sheet. We proposed a method to obtain a total heat exchanger material by immersing the material in an adhesive layer and attaching it with the other parts exposed, and then baking the adhesive and moisture absorbent at high temperature.

Problems to be Solved by the Invention In the above method, sheets, especially metal sheets such as aluminum, stainless steel, copper, brass, etc., do not pose a risk of catching fire during operation of the total heat exchanger, but since they are all expensive, they should be used as much as possible. It is necessary to reduce the amount used to reduce costs, and if an unnecessarily thick sheet is used, the ratio of the cross-sectional area through which gas flows (porosity) to the cross-sectional area of the honeycomb becomes small, which increases the gas passage resistance, i.e. Pressure loss increases, and on the other hand, if the sheet is too thin, it becomes mechanically weak, causing various problems during production and use, and especially during corrugation molding, the sheet tears and becomes impossible to mold.

Furthermore, if the amount of moisture absorbent attached to the sheet is too small, the latent heat exchange efficiency of the element will decrease, and conversely, if the amount of moisture absorbent attached is too large, the element will adsorb various odorous substances in addition to water vapor, and this odor will be emitted into the supply air. Materials may collapse.

Furthermore, when the sheets are corrugated and stacked in a honeycomb shape to obtain an element, the size of the cross section of the small through holes, that is, the size of the waves in the corrugated sheet, is also important.If the cross section of the small through holes is too large, total heat exchange will occur. Sometimes the total surface area of the sheet, which is the exchange medium, becomes smaller and the contact area with the passing air becomes smaller, reducing the total heat exchange efficiency.On the other hand, if the cross section of the small perforations is too small, the air and other gases to be treated will be reduced. The resistance, that is, the pressure loss when the gas passes through the element increases, and a large amount of power is required, making economical operation impossible.

Means for Solving the Problems The present invention solves the above problems.
Particles of a heat-absorbing heat-absorbing agent are fixed to the surface of a sheet of metal, plastic, etc. of 00 μm at a ratio of 6 to 15 g in total on the front and back per surface area of the sheet], and the sheet is heated at a wavelength of 2.5 to
The material is corrugated to a thickness of 5.0 mm and a wave height of 1.0 to 2.6 mm, and a planar sheet and a corrugated sheet are alternately subjected to H4N to form an element having a large number of small through holes.

Example 1 FIG. 1 is a schematic diagram of the apparatus used in the method of the present invention, where 1 is a container for adhesive 2, 3 is a dryer, 46 is a container for moisture absorbent particles 5, and 46 is a container for moisture absorbent particles 5. From this, the sheet surface in the chamber 9 is ejected from the nozzles 7 and 8 together with the air as a jet stream. 104 is a hopper for replenishing the moisture absorbent particles 5, 11 is a drying heater, 12 is a return path for the moisture absorbent particles 5 attached to the chamber 9, and 13 is a drying heater.

Polyvinyl acetate adhesive 2 is applied to both sides of an aluminum sheet 14 with a thickness of 60 μm to a thickness of 50 to 60 μm by adjusting the gap between rollers 15, and after semi-drying the adhesive using a drying heater 3, it is placed in a chamber 9. Silica gel particles with a particle size of 100 μ or less (Fuji Silica Gel Type A manufactured by Fuji Davison Chemical Co., Ltd.) are sprayed onto both sides of the guide sheet using a jet stream, with a total of 12 g per 1 m2 of surface area on both sides of the sheet.
The front and rear silica gels are fixed, and then the drying heater 11
The adhesive is completely dried, and then baked at a high temperature (150 to 220 DEG C.) in a dryer 13 to solidify and stabilize the applied adhesive layer. Then, unattached silica gel particles are removed by an appropriate method (not shown) such as air blowing or water washing to continuously obtain an aluminum sheet 16 to which silica gel is adhered and fixed.

The aluminum sheet I6 to which the silica gel has been adhered and fixed is corrugated, and as shown in FIG. 2, the flat sheet 16 and the corrugated sheet 17 are alternately adhered to the boss 18 and wound to a desired size, forming a large number of small transparent sheets. It is formed into a cylindrical shape with holes 19 passing through both end faces.

Several grooves are drilled in the radial direction on both end faces of the cylinder, reinforcing spokes 20.20 are embedded and fixed in the grooves, an outer steel plate 21 is wrapped around the circumferential surface, and one end of the spokes 20.20 is Pos 1
The other end is fixed to the outer circumferential steel plate 21 by appropriate means such as bolting, and the strip plates 22.2 are attached to both end edges of the outer circumferential steel plate 21.
2 is wound and fixed, and a connecting strip plate 23.
23 is stretched and fixed to obtain a total heat exchanger element.

Example 2 A polyvinyl acetate adhesive containing moisture absorbent particles and about 5 to 8% of a blowing agent, such as sodium hydrogen carbonate or ammonium carbonate, which decomposes on heating to generate a gas, preferably carbon dioxide, is applied to a 50 μm thick aluminum sheet. After drying, the adhesive was ignited in the mold to decompose and foam the foaming agent, and then the aluminum sheet was corrugated in the same manner as in Example 1 to form a planar shape as shown in Figure 2. The sheets and corrugated sheets are alternately laminated, and accessory parts are attached to obtain a total heat exchanger element.

In the above embodiments, the sheet material may be appropriately selected from materials other than aluminum, such as aluminum alloys, stainless steel, metals such as copper and brass, plastics such as polyvinyl chloride, polyethylene and polypropylene, and paper that can be corrugated. .

As the adhesive, polyvinyl acetate, epoxy resin, silicone resin, acrylic resin, etc. are used. Adsorption type moisture absorbers include silica gel, alumina gel, metal silicate gel,
Zeolite etc. are used.

Effect of the Invention The cylindrical total heat exchanger element obtained in the above embodiment is housed in a casing 25 while being rotatably held by a shaft 24 as shown in FIG. 3, as in the conventional product.

Ducts 2728 and 29.30 are provided to divide both end faces of the element 26 into a popular zone, a supply air zone, a return air zone, and an exhaust zone, and the element 26 is approximately 10 to 1519 m long.
The drive rotates at a speed of Eject EA.

Effects of the invention According to the above examples, the thickness peeling μ, 60μ, 100μ and 1
Using an aluminum sheet of 20゜μ (control example),
The extra cost of 10g on the front and back sides per 1m'' of surface area of the sheet is reduced by 1
．． 8mm (see Figure 4), element thickness 200+Im
Outside air OA and air RAP are applied to the total heat exchanger obtained as
[++u++Aq] is shown in FIG. In the figure, the horizontal axis indicates the wind speed [m/see,] of outside air and return air at the element inlet.

The table below shows examples of the porosity and the unit price of the aluminum sheet under the above conditions when the thickness of the adhesive and silica gel fixed to the sheet surface is 100 μm in total on both sides.

Sheet thickness 15 60 100 1
20 [μm Unit price [yen/go] 32.0 118.3 186.
3 21? , l Open area ratio [%] 87.9 83.
1 79.0 76.8 As is clear from Figure 5 and the table above, if the thickness of the aluminum sheet exceeds 100μ, the cost will increase and the porosity will decrease, resulting in only an increase in static pressure loss and the unit volume will increase. Since the surface area per unit does not change, the total heat exchange efficiency does not increase and only the operating power increases, which is uneconomical.

Heat exchange efficiency is calculated as follows.

The dry bulb temperature [''C] of outside air OA, supply air SA, and return air RA is calculated as toa+tsa+t*A+absolute temperature [kg/kg'l].
χ respectively. a.

χ0. When χ□ and enthalpy [kcal/kg] are respectively l0Alsa+IIIA, the sensible heat exchange efficiency is ηt = [(toa-tsAl/ (toA-t++)
A)] X 100% latent heat exchange efficiency is n, x = [(χG & -χ
] X100% total heat exchange efficiency is η+ = C(jam-ixal/(laa-Lal
It is expressed as l x 100%.

On the contrary, if the thickness of the aluminum sheet is less than 20 μm, there is a risk that the sheet will be torn during handling, manufacturing or handling of the device, and it cannot be manufactured and used economically.

Next, according to the above example, an aluminum sheet with a thickness of 30 μm was used, and a total of 4
Silica gel was deposited in proportions of 1.5 g, 6 g, 15 g, and 18 g, the wavelength P was 3.4 mm, and the wave height was 1.8 m.
m, the thickness of the element, i.e. the length of the small hole, is 200 mm.The temperature of the total heat exchanger element obtained is 35°C and the absolute humidity is 15.
Latent heat exchange efficiency n, [%] when total heat exchange is carried out by sending in g/kg of outside air and return air with a temperature of 27°C and an absolute temperature of 10 g/kg at a wind speed of 1 to 5 va/sec. Sensible heat exchange efficiency η.

[%] is shown in FIG. Sensible heat exchange efficiency is related to the amount of moisture absorbent fixed to the sheet (it is constant. The horizontal axis in the figure shows the wind speed fm/sec at the element inlet of outside air and air. As is clear from the figure, the sheet surface If the total amount of silica gel (=I) deposited on the back surface is 6 g or more, the latent heat exchange efficiency is relatively high. showed a latent heat exchange efficiency of 63%, and the total heat exchange efficiency was also high (although with silica gel @ total amount of 6 g/
For example, in the case of 4 glrd, the latent heat exchange efficiency is low (for example, as shown in Fig. 6, the wind speed is 2IIl/Se).
In the case of kerosene, it is 47%, which means that the total heat exchange efficiency is also low. On the other hand, the amount of silica gel fixed is 15g/rr? If this value is exceeded, the amount of odor transfer increases, and the odor contained in the air (e.g., coming from toilets and kitchens in buildings) gets mixed into the supply air and contaminates the indoor air. All of the adsorption-type moisture absorbents used in the present invention belong to wood-philic adsorbents, but silica gel and alumina gel and their bases also absorb some amount of various gases such as organic solvent vapor and odorous substances as well as moisture. Chopsticks that can be attached and detached (e.g. C, L, klantel),
(Co-translated by Hiroshi Yanai and Kozo Kano, published by Migihodo Publishing Co., Ltd., October 5, 1961, "Adsorption and Adsorbents", No. 154 Bacteria text, line 2, page 159, line 4, page 163, line 7, etc.). Therefore, when the element for a total heat exchanger according to the present invention is used for total heat exchange, even after adsorbing hot air, if there is excess adsorbent in the element, organic solvent vapor and odor substances will be adsorbed and transferred. Add 6 to 20 g of silica gel on both sides of the sheet.
Add 200 pp each of ammonia, methyl ethyl ketone, benzene, and toluene to the fixed total heat exchanger element.
Temperature 25℃, absolute humidity log/
Figure 7 shows the air in kg. As shown in the figure, when using a total heat exchanger element with silica gel adhered to both sides of the sheet at a rate of about 17 g/rr, ammonia, methyl ethyl ketone, benzene, or toluene in the supply air is adsorbed by the element and transferred into the supply air. Its concentration is such that it can be detected by the human sense of smell (53 ppm for ammonia), written by Hiroshi Horiguchi, published by Sankyo Publishing Co., Ltd. on February 10, 1971, "Pollution and Poisons".
Dangerous Goods〈No m edition〉page 328, Methyl ethyl ketone 3
000ppH1, 1.5ppm for benzene, 0.48ppm+ for toluene, there is a possibility that the concentration will exceed 1.000ppH1, 1.5ppm for benzene, and 0.48ppm+ for toluene. For example, when air containing various gases generated from a building's kitchen, toilet, or human body is used as air, it is necessary to minimize the transfer of these odorous gases into the supply air via a total heat exchanger. Therefore, the amount of adsorbent moisture absorbent adhering to both sides of the sheet must be 15 g/rn' or less in total on both sides.

Next, using an aluminum sheet with a thickness of 30 μm according to the above example, a total of 10 g of silica gel was attached to both the front and back surfaces per 1 m” of surface area of the sheet, and the wavelength P and wave height were adjusted to wavelength (m+*) wave height (am) A 2
．． 0 1. OB 2.5
1.3C3,41,8 D 4.2 2.2E
5.0 2.6 (control example) F 6.0 3.6 (control example) A total heat exchanger obtained with an element thickness of 200 LL 1 m was charged with outside air at a temperature of 35°C and an absolute humidity of 15 g/kg ( OA) and temperature 25℃, absolute humidity] Og/kg of ambient air (
Figure 8(a) shows the total island exchange efficiency n [%] when total heat exchange is performed through the static pressure loss ΔP [mmAq
1 is shown in FIG. 8(b). The horizontal axis in the figure is the wind speed [m/see
, ] is shown.

As is clear from the figure, the wavelength of the wave of the corrugated sheet is 2.5.
If the wave height is less than 1.0 mm, such as 0.8 mm, the static pressure loss will be very large and the operating power will be large, making it impossible to achieve the purpose of energy saving. If the wave height exceeds 0.0 mm or 2.6 mm, the total heat exchange efficiency becomes small and the purpose of energy saving cannot be achieved compared to the energy required to operate the total heat exchanger.

All of the above data are shown for the case where an aluminum sheet is used as the sheet, but almost the same data can be obtained using sheets of metals other than aluminum, plastic sheets, paper, etc.

In addition, the above data are all shown for the case where silica gel is used as the moisture absorbent, but even when alumina gel, metal silicate gel, hydrophilic zeolite, etc. are used, when the wind speed in front of the element is 1 to 4 m/sec. They show almost the same tendency.

The total heat exchanger element obtained according to the present invention is produced by fixing adsorbent moisture absorbent particles on the surface of a sheet with a thickness of 20 to 100 μ at a rate of 6 to 15 g in total on the front and back sides per 1 m of the sheet as described above. 2.5~5.0mm, wave height lO~2
．． We fabricated a total heat exchanger element by corrugating to 6 mm and stacking flat sheets and corrugated sheets alternately to allow a large number of small holes to penetrate through both end faces, so it has a sufficient porosity and is economical. In addition to achieving a satisfactory total heat exchange efficiency, the pressure loss is small, so the power required for operation for blowing air is small, the running cost is low, and it can be manufactured at low cost, and odor substances other than hot air are supplied. This has the effect of preventing air from entering the air.

[Brief explanation of drawings]

The figures show examples of the present invention, FIG. 1 is a partially cutaway explanatory diagram showing the first step of the present invention, and FIG. 2 is a perspective explanatory diagram showing a total heat exchanger element obtained by the present invention. Fig. 3 is a vertical sectional view showing how the total heat exchanger element is used, Fig. 4 is a perspective explanatory view showing a part of the single-wave molded body, and Fig. 5 is the thickness of the sheet constituting the total heat exchanger element. Figure 6 shows the latent heat exchange efficiency n7 [%] when the amount of adsorbent moisture absorbent fixed on the sheet surface is changed.
and a graph showing changes in sensible heat exchange efficiency ηS [%1,
Figure 7 is a graph showing changes in the odor transfer rate [%] and odor transfer rate [ppm] when the amount of adsorbent moisture absorbent adhering to the surface of the sheet is changed. Total heat exchange efficiency η [%] and static pressure loss Δ of the total heat exchanger element when changing the wavelength and wave height of
It is a graph showing a change in P [++++yAq]. In Figures 1 to 4, 2 is an adhesive, 5 is a moisture absorbent particle, and 1
4 is a sheet, 16 is a flat sheet, 17 is a corrugated sheet, 19 is a small through hole, and 26 is a total heat exchanger element. Tateaumura Dai + Σ ■Shunigaku M Abandoned Sleeping Box Procedures Amendment (Voluntary) Kanade August November 1991

Claims (1)

[Claims] 1. Particles of an adsorbent moisture absorbent are fixed to the surface of a sheet having a thickness of 20 to 100 μm via an adhesive layer at a rate of 6 to 15 g in total on the front and back per 1 m^2 of surface area of the sheet. wavelength 2.
A total heat device characterized by corrugating to a thickness of 5 to 5.0 mm and a wave height of 1.0 to 2.6 mm, and alternately laminating flat sheets and corrugated sheets to form an element having a large number of small through holes. Method for manufacturing exchanger elements. 2. The element for a total heat exchanger according to claim 1, characterized in that particles of an adsorption type moisture absorbent are attached with a part of the particles buried in an adhesive layer and the other part exposed. manufacturing method. 3. Mix an adsorbent moisture absorbent and a foaming agent into the adhesive and apply it to the surface of the sheet so that the amount of adsorption moisture absorbent on the front and back sides is 6 to 15 g per 1 m^2 of surface area of a sheet with a thickness of 20 to 100 μm. This sheet is coated and heated to create voids in the adhesive layer due to the foaming agent so that the moisture absorbent can breathe.
1. A method for manufacturing a total heat exchanger element, which comprises corrugating a wafer, and alternately laminating flat sheets and corrugated sheets to form an element having a large number of small through holes. 4. A method for manufacturing a total heat exchanger element according to claim 1 or 3, wherein the sheet is made of metal, plastic, or paper. 5. The method for producing a total heat exchanger element according to claim 1 or 3, wherein the adsorption type moisture absorbent is silica gel, alumina gel, zeolite, metal silicate gel, or a mixture thereof.