JP2007315649A - Total enthalpy heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a total enthalpy heat exchanger allowing the stable and firm adhering of partitioning plates and spacing plates without reducing a substantial effective moisture permeation area of the partition plates containing an adsorbent, and without using a moisture permeable film of low moisture permeability, containing a lithium chloride, having low toxicity, with the partitioning plates and the spacing plates integrated by an adhesive of weak odor. <P>SOLUTION: In this total enthalpy heat exchanger 1 having the partitioning plates 4 having gas shielding properties and the spacing plates 7 for keeping intervals between the partitioning plates 4, allowing two kinds of airflows to flow with the partitioning plate 4 therebetween, and exchanging the sensible heat and latent heat of two kinds of airflows through the partitioning plates 4, the partitioning plates 4 and the spacing plates 7 contain deliquescent moisture absorbents, and the partitioning plates 4 and the spacing plates 7 are adhered with the adhesive composed of an aqueous solution of a mixture of the lithium chloride mixed into water-soluble nonionic resin containing at least one of a carboxyl group and a hydroxyl group. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a total heat exchanger used in, for example, a ventilator that performs air supply from the outside to the room and exhaust from the room to the outside at the same time.

  As a method of performing ventilation without impairing the indoor heating / cooling effect, there is a method of performing ventilation while exchanging heat between supply air and exhaust. In addition, in order to improve the efficiency of heat exchange, the temperature (sensible heat) and humidity (latent heat) are exchanged simultaneously (ie, total heat exchange is performed) without mixing gas between the supply air and the exhaust. To do) is effective.

  A conventional total heat exchanger is composed of a laminated body in which an air supply layer through which an air flow of supply air is passed and an exhaust layer through which an air flow of exhaust passes are alternately stacked via a moisture-permeable partition plate Is done. The air supply layer is provided with an air supply passage that guides the airflow of the supply air along the partition plate. The exhaust layer is provided with an exhaust passage that guides the airflow of the exhaust along the partition plate. The air supply passage and the exhaust passage are each formed by a corrugated spacing plate that maintains the spacing of the partition plates arranged at a predetermined spacing. Furthermore, the direction in which the airflow of the supply air is guided by the air supply passage and the direction in which the airflow of the exhaust air is guided by the exhaust passage are orthogonal to each other.

A method using an adhesive is often used for integrating the spacing plate and the partition plate. That is, after an adhesive is applied to the tip of the spacing plate in advance, the partition plate is bonded and integrated. At this time, it is common to use an adhesive having low toxicity and weak odor. For example, an aqueous adhesive in which starch or vinyl acetate as an adhesive resin is dissolved or dispersed in water. The agent was used.
However, since the water-based adhesive has low moisture permeability, the moisture-permeable action in the thickness direction of the partition plate is hindered in the application portion of the water-based adhesive, and the moisture-permeable area in the partition plate (effective moisture-permeable area) The problem of decrease is caused.

  In addition, as the material of the partition plate and the spacing plate, nonporous total heat exchange that has high shielding between the supply air and exhaust air in the total heat exchanger and can exchange humidity with temperature Element paper has been proposed (see, for example, Patent Document 1). In this conventional example, the nonporous total heat exchange element paper is composed of a substantially nonporous cellulosic substrate and a moisture absorbent such as lithium chloride or calcium chloride contained in the cellulosic substrate. Yes.

Here, in the step of integrating the partition plate and the spacing plate with the aqueous adhesive, in order to express the adhesive strength of the aqueous adhesive, the moisture of the applied aqueous adhesive is evaporated and dried, It is necessary to leave the adhesive resin at the interface between the partition plate and the spacing plate.
When a material such as the non-porous total heat exchange element paper described above is used for the partition plate and the spacing plate, the aqueous adhesive applied between the partition plate and the spacing plate is placed inside the partition plate and the spacing plate. As a result of the penetration, sufficient adhesive resin does not remain at the interface between the partition plate and the spacing plate, and there arises a problem that the stable and strong adhesion between the partition plate and the spacing plate is hindered.

  Furthermore, as a result of the water-based adhesive penetrating into the partition plate, the effective moisture permeable area of the partition plate is further reduced, resulting in a problem that effective latent heat exchange cannot be performed between the supply air and the exhaust air. Also, in order to stably and firmly bond between the partition plate and the spacing plate, when the amount of aqueous adhesive applied is increased, the aqueous adhesive is further permeated into the partition plate, Effective moisture permeable area is reduced.

  In consideration of the above problems, a total heat exchanger (heat exchange element) in which a partition plate (partition member) and a spacing plate (spacing holding member) are integrated without using an adhesive has been proposed (for example, Patent Documents). 2). In this conventional example, each of the partition plate and the spacing plate has air shielding properties on both surfaces of a porous member containing a hygroscopic agent (moisture permeable agent) such as lithium chloride that can transmit latent heat, For example, it has a three-layer structure coated with a moisture permeable membrane made of a material such as polyvinyl alcohol. Further, a material obtained by mixing a resin or the like as a binder into the material of the spacing plate is used, and the partition plate and the spacing plate are integrated by heat fusion.

  Furthermore, a total heat exchanger has been proposed in which the partition plate and the spacing plate (spacing retention plate) are integrated using an adhesive having high moisture permeability, and the reduction in the effective moisture permeable area of the partition plate is suppressed ( For example, see Patent Document 3). In this conventional example, the partition plate and the spacing plate are bonded with a fluorine-based resin or a hydrocarbon-based resin having a hydrophilic group and high hygroscopicity and moisture diffusibility.

WO2002 / 099193 JP 2002-310589 A JP 2005-24207 A

In recent years, heat exchangers have been required to further improve latent heat exchange efficiency.
However, the moisture permeable membrane in the conventional total heat exchanger described in Patent Document 2 is inferior in moisture permeability as compared with a base material containing a hygroscopic agent such as lithium chloride, and is required to improve the latent heat exchange efficiency. The problem that it was not possible to cope with.

  Further, the adhesive used in the total heat exchanger described in Patent Document 3 uses a fluorine-based resin containing an expensive compound such as perfluorosulfonic acid, is highly toxic, and has an odor. It was necessary to use a hydrocarbon compound containing an allyl vinyl compound such as strong styrene. In addition, it is necessary to use odor and harmful organic solvents as solvents for fluororesins and hydrocarbon compounds, and careful removal of organic solvents requires a cumbersome process such as drying at high temperatures for a long time. It becomes.

  The present invention has been made to solve the above-described problems, and uses a moisture permeable membrane having a low moisture permeability without reducing the substantially effective moisture permeable area of the partition plate containing the moisture absorbent. Without any problem, it is possible to bond the partition plate and the spacing plate stably and firmly and contains lithium chloride. The purpose is to obtain a total heat exchanger.

  The present invention has a partition plate having a gas shielding property and a spacing plate that keeps the spacing between the partition plates, allows two types of airflow to flow through the partition plate, and sensible heat of the two types of airflow through the partition plate. And a total heat exchanger for exchanging latent heat, the partition plate and the interval plate contain a moisture absorbent consisting of at least one of a deliquescent alkali salt or alkaline earth metal salt, and the partition plate and the interval plate are The adhesive is made of an aqueous solution of a mixture of lithium chloride and a water-soluble nonionic resin containing at least one of a carboxyl group and a hydroxyl group.

According to the total heat exchanger of the present invention, since the partition plate containing the deliquescent hygroscopic agent and the spacing plate are adhered by the adhesive containing lithium chloride, the adhesive has high moisture permeability. The partition plate and the spacing plate can be integrated stably and firmly without reducing the effective moisture permeable area in the partition plate.
Moreover, according to the total heat exchanger of this invention, it is not necessary to use a moisture-permeable film with low moisture permeability, and the moisture permeability of a partition plate can be maintained high.
In addition, according to the total heat exchanger of the present invention, the adhesive is an aqueous solution of a mixture of lithium chloride in a water-soluble nonionic resin with low toxicity and low odor, so the toxicity is high. And it can manufacture, without requiring a troublesome process, such as removing the organic solvent with strong odor.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of a total heat exchanger according to the present invention, FIG. 2 is an enlarged cross-sectional view of a junction between a partition plate and a spacing plate in the total heat exchanger shown in FIG. 1, and FIG. It is a perspective view of the unit component member of an exchanger.

  1 and 2, the total heat exchanger 1 includes a partition plate 4 in which an air supply layer 2 through which an air flow of supply air passes and an exhaust layer 3 through which an air flow of exhaust passes are moisture permeable. It is composed of stacked layers that are alternately stacked. The air supply layer 2 is provided with an air supply passage 5 that guides the airflow of the supply air along the partition plate 4. The exhaust layer 3 is provided with an exhaust passage 6 that guides an exhaust airflow along the partition plate 4. The supply passage 5 and the exhaust passage 6 are formed by corrugated spacing plates 7 that keep the spacing of the partition plates 4. Further, the direction A in which the airflow of the supply air is guided by the supply passage 5 and the direction B in which the airflow of the exhaust is guided by the exhaust passage 6 are orthogonal to each other.

  The partition plate 4 includes a first base material made of non-porous paper and a humectant having deliquescence contained in the first base material. The hygroscopic agent is, for example, an alkali metal salt such as lithium chloride or an alkaline earth metal salt such as calcium chloride, and at least one of the alkali metal salt and the alkaline earth metal salt is contained in the first substrate. In addition, as the first base material, it is possible to use a porous material such as a resin film, a non-woven fabric such as polyolefin or polyester, a metal fiber, or a glass fiber among papers. It is.

Moreover, since the partition plate 4 exchanges humidity with temperature without mixing the gas between the supply air and the exhaust gas, the partition plate 4 needs to have a gas shielding property. The partition plate 4 has an air permeability in the thickness direction (JIS P1887) of 5000 seconds / 100 cc (cm ³ ) or more, that is, a partition plate having an area of 645 mm ² in the measurement of the air permeability according to JIS P1887. A material having a time required for 100 cm ³ of air to pass through 4 is 5000 seconds or more. In addition, the numerical value of the air permeability shown after this has shown what was obtained by the measurement of the air permeability according to JISP8117.

  The thickness of the partition plate 4 is not particularly limited. However, when the thickness is less than 10 μm, the strength is lowered and it is difficult to satisfy the above-described gas shielding property. Moreover, when it exceeds 100 μm, it is often difficult to maintain high moisture permeability. Therefore, the thickness of the partition plate 4 is preferably 10 μm to 100 μm.

The amount of the hygroscopic agent contained in the partition plate 4 is preferably ² g or more, more preferably 4 g or more per 1 m ² of the area of the partition plate 4 from the need to maintain high moisture permeability. Furthermore, since the moisture permeability of the partition plate 4 increases as the content of the hygroscopic agent in the partition plate 4 increases, it is preferably as large as possible from the viewpoint of moisture permeability. However, the rate of increase in moisture permeability with respect to the rate of increase of the hygroscopic agent contained in the first base material becomes mild when the content of the hygroscopic agent exceeds 10 g per 1 m ² , and is extremely small when it exceeds 20 g. It will be a thing. Therefore, it is appropriate to suppress the hygroscopic agent contained in the first base material to 20 g or less per 1 m ^{2 in} consideration of the effects on cost and moisture permeability.

Moreover, the space | interval board 7 is comprised with the 2nd base material which consists of processed paper shape | molded by the waveform, and the moisture absorbent which has the deliquescence contained in the 2nd base material. The vertical and horizontal sizes of the spacing plate 7 are the same as the vertical and horizontal sizes of the partition plate 4. As the hygroscopic agent, the same hygroscopic agent contained in the first substrate is used.
The spacing plate 7 is not limited in thickness and shape as long as the spacing between the partition plates 4 is kept constant and the air permeability in the air supply passage 5 and the exhaust passage 6 is ensured without any problem. Although there is no, the thickness of the 2nd substrate is set in the range of 50 micrometers-200 micrometers. Furthermore, as the material of the second base material, paper other than processed paper, resin, or the like can be used. However, the second base material does not need a high gas shielding property. The amount of the hygroscopic agent contained in the second base material is equivalent to the content of the hygroscopic agent contained in the first base material in the partition plate 4.

The partition plate 4 and the spacing plate 7 are fixed with an adhesive 8.
Adhesive 8 has a water-soluble nonionic resin (adhesive resin) containing at least one of a carboxyl group and a hydroxyl group, low toxicity and low odor, and dissolved in water. Is.
Examples of the water-soluble nonionic resin include polycarboxylic acid resins such as polyacrylic acid having a carboxyl group, polyacrylic acid copolymer, polymethacrylic acid copolymer and alginic acid, and polyhydroxy resins such as polyvinyl alcohol having a hydroxyl group. Etc. are used. Among them, it is preferable to use polyacrylic acid and polyvinyl alcohol, which have strong adhesiveness and versatility.

Further, the adhesive 8 may be one obtained by crosslinking the above polycarboxylic acid resin or polyhydroxy resin for the purpose of improving water resistance and heat resistance.
When crosslinking a polycarboxylic acid resin, as a crosslinking agent, a low molecular or high molecular polyol compound such as glycerin or polyvinyl alcohol or a high molecular polyol compound, or a dihydrazide compound such as adipic acid dihydrazide An aqueous blocked isocyanate compound that regenerates an active isocyanate group by heating is used.

  When cross-linking polyhydroxy resins, low-molecular or high-molecular polycarboxylic acid compounds containing two or more carboxylic acid groups in one molecule, such as adipic acid and polyacrylic acid, and water-based blocked isocyanates are used as cross-linking agents. A compound or the like is used.

Next, the operation of the total heat exchanger 1 will be described.
For example, when cold and dry outside air is passed through the supply layer 2 as supply air, and warm and humid room air is passed through the exhaust layer 3 as exhaust, each supply air flow and exhaust air flow (two air flows) ) Flows across each partition plate 4. At this time, heat and water vapor pass through the partition plate 4, and heat exchange of sensible heat and latent heat is performed via the partition plates 4 between the supply air and the exhaust air. Thus, the supply air is warmed and humidified and supplied to the room, and the exhaust is cooled and dehumidified and discharged to the outside.

Next, the manufacturing method of the total heat exchanger 1 is demonstrated.
The total heat exchanger 1 is configured by laminating unit constituent members 9. As shown in FIG. 3, the unit component member 9 is configured by integrating the partition plate 4 and the spacing plate 7. The unit constituting member 90 is formed by applying an adhesive 8 to a pointed portion 10 on the surface side (one side) of the processed paper among the pointed portions of the interval plate 7 in which the processed paper is formed into a waveform, Manufacture is performed by placing the spacing plate 7 with the tip 10 on one side aligned with the surface of the plate 4 and drying the adhesive 8.

  And the adhesive agent 8 is apply | coated to the edge part 11 of the back surface side (other side) of each paper of several unit structural member 9, and the direction of the wave groove of the space | interval board 7 of the unit structural member 9 is orthogonally crossed alternately. A desired number of unit constituent members 9 are stacked. Further, only the partition plate 4 is disposed at the tip end portion 11 on the other side of the spacing plate 7 of the uppermost unit component member 9. And the total heat exchanger 1 with which the partition plate 4 and the space | interval board 7 were integrated is obtained by drying the adhesive agent 8. FIG.

Hereinafter, the present invention will be further described with reference to Examples and Comparative Examples.
Example 1.
The partition plate was made of non-porous paper having a thickness of 30 μm and containing 4 g / m ^{2 of} lithium chloride, and a first base material having an air permeability of 30000 seconds / 100 cc was used.
The spacing plate used was a second substrate made of processed paper having a thickness of 100 μm and containing 4 g / m ^{2 of} lithium chloride.
As the adhesive, an aqueous solution containing 10 wt% of a mixture containing 33 wt% lithium chloride in a mixture of polyacrylic acid (PAA) as an adhesive resin having an average molecular weight of 800,000 and lithium chloride was used.

And the adhesive agent was apply | coated to the one edge part of the space | interval board, the space | interval board and the partition plate were piled up, and the unit structural member was obtained by drying an adhesive agent at 80 degreeC for 1 hour. At this time, the application width of the adhesive applied to the tip of one side of the spacing plate was 1 mm, and the thickness was adjusted so that the application amount of the adhesive was 15 ± 3 g / m ² after drying. .
Furthermore, an adhesive is applied to the tip of the other side of the unit constituent member, the unit constituent members are stacked in plural layers, and the adhesive is dried at 80 ° C. for 1 hour to obtain a total heat exchanger of 30 cm × 30 cm × 50 cm. It was.

Example 2
A total heat exchanger was obtained in the same manner as in Example 1 by using an aqueous solution containing 10 wt% of a mixture containing 20 wt% of lithium chloride in a mixture of polyacrylic acid and lithium chloride as an adhesive. Other configurations are the same as those of the first embodiment.

Example 3
A total heat exchanger was obtained in the same manner as in Example 1 using an aqueous solution containing 10 wt% of a mixture containing 10 wt% of lithium chloride in a mixture of polyacrylic acid and lithium chloride as an adhesive. Other configurations are the same as those of the first embodiment.

Example 4
As in Example 1, using a first base material containing 2 g / m ^{2 of} lithium chloride as the partition plate and using a second base material containing 2 g / m ^{2 of} lithium chloride as the spacing plate. A total heat exchanger was obtained. Other configurations are the same as those of the first embodiment.

Example 5 FIG.
As in Example 1, using a first base material containing 8 g / m ^{2 of} lithium chloride as the partition plate and using a second base material containing 8 g / m ^{2 of} lithium chloride as the spacing plate. A total heat exchanger was obtained. Other configurations are the same as those of the first embodiment.

Example 6
As in Example 1, using a first base material containing 4 g / m ^{2 of} calcium chloride as the partition plate and using a second base material containing 4 g / m ^{2 of} calcium chloride as the spacing plate. A total heat exchanger was obtained. Other configurations are the same as those of the first embodiment.

Example 7
As an adhesive, an aqueous solution containing 10 wt% of a mixture containing 20 wt% lithium chloride in a mixture of polyvinyl alcohol (PVA) as an adhesive resin having a polymerization degree of 1700 and a saponification degree of 98% and lithium chloride is used. In the same manner as in Example 1, a total heat exchanger 1 was obtained. Other configurations are the same as those of the first embodiment.

Example 8 FIG.
As an adhesive, an aqueous solution containing 10 wt% of a mixture containing 20 wt% of lithium chloride in a mixture of polyacrylic acid and lithium chloride was used. Furthermore, adipic acid dihydrazide as a crosslinking agent was added to the adhesive at a ratio of 1 part by weight to 10 parts by weight of polyacrylic acid. A total heat exchanger was obtained in the same manner as in Example 1. Other configurations are the same as those of the first embodiment.

Example 9
A total heat exchanger 1 was obtained in the same manner as in Example 1 by using an aqueous solution containing 10 wt% of a mixture containing 5 wt% of lithium chloride in a mixture of polyacrylic acid and lithium chloride as an adhesive. Other configurations are the same as those of the first embodiment.

Example 10
As the adhesive, an aqueous solution containing 10 wt% of a mixture containing 5 wt% of lithium chloride in a mixture of polyacrylic acid and lithium chloride was used. Furthermore, Example 1 using a first base material containing 8 g / m ^{2 of} lithium chloride as the partition plate and using a second base material containing 8 g / m ^{2 of} lithium chloride as the spacing plate. The total heat exchanger 1 was obtained in the same manner. Other configurations are the same as those of the first embodiment.

Comparative Example 1
A total heat exchanger 1 was obtained in the same manner as in Example 1 using a partition plate and a spacing plate that did not contain a hygroscopic agent (content: 0 g / m ² ). Other configurations are the same as those in the first embodiment.

Comparative Example 2
A total heat exchanger 1 was obtained in the same manner as in Example 1, using an aqueous emulsion containing only 10 wt% of polyvinyl acetate polymer (PVAc) as an adhesive resin as an adhesive. Other configurations are the same as those in the first embodiment.

Comparative Example 3
A total heat exchanger 1 was obtained in the same manner as in Example 1 using an aqueous solution containing only 10% by weight of polyacrylic acid as an adhesive. Other configurations are the same as those of the first embodiment.

  Next, performance evaluation of each total heat exchanger of Examples 1 to 10 and Comparative Examples 1 to 3 will be described. In the total heat exchanger, the heat and humidity exchange efficiency between the supply air and the exhaust air was evaluated in accordance with the two-chamber method in Appendix 4 of JIS B 8628 (total heat exchanger). In the evaluation of the heat exchange efficiency and the humidity exchange efficiency, the condition of the primary air flow (supply air) is 27 ° C., the relative humidity is 52.7% RH, the condition of the secondary air flow (exhaust air) is 35 ° C., the relative humidity. It is 64.3%.

Also, in the total heat exchanger, the pressure loss measured in the initial state is compared with the pressure loss measured after the wet and dry repeated test described below, and fluctuations in the air supply and exhaust air permeability in the total heat exchanger are compared. Evaluation was performed from the viewpoint of pressure loss.
In the wet and dry repeated test, each total heat exchanger is left for 24 hours in a sealed container filled with air at 60 ° C. and relative humidity 90% RH, and the air filled in the sealed container is set to 25 ° C. and 45% RH. Then, leaving for 24 hours was performed by repeating 5 cycles.
Note that the pressure loss was measured in the initial state and in each of the total heat exchangers after the repeated wet and dry tests in both directions of the air supply flow path and the exhaust flow path, and the data with the larger pressure loss was adopted.
In addition, as the increase in the pressure loss after the dry / wet repeated test with respect to the initial pressure loss is suppressed, the supply / exhaust air flows without any problem in the supply / exhaust channel without being affected by the dry / wet repeated test. It shows that.

  In the measurement results of pressure loss, when the pressure loss after the wet and dry repeated test is less than 105% with respect to the initial pressure loss, the total heat exchanger is presumed that the pressure loss is not substantially increased by the dry and wet repeated test. Judgment (A): When the pressure loss after the wet and dry repeated test is 105% or more and less than 120% with respect to the initial pressure loss, the pressure loss is slightly increased by the dry and wet repeated test, but there is no practical problem. If the pressure loss after the wet and dry repeated test is 120% or more of the initial pressure loss, the pressure loss increases too much, impeding the ventilation of the supply air channel and the exhaust gas channel. Judgment was made at a level that would impair the above reliability, and it was determined to be impossible (×).

  Table 1 shows the results of performance evaluation of the total heat exchangers of Examples 1 to 10 and Comparative Examples 1 to 3.

Table 1 shows the types of adhesive resin used for the adhesive in each total heat exchanger, the presence or absence of a crosslinking agent in the adhesive, and lithium chloride in a mixture of lithium chloride (LiCl) and adhesive resin in the adhesive. Content [wt%] (lithium chloride content in adhesive [wt%]), type of moisture absorbent contained in partition plate and spacing plate, content of moisture absorbent in partition plate and spacing plate [g / m ² ], the temperature exchange rate of the total heat exchanger, the humidity exchange rate of the total heat exchanger, and the results of comparing the initial pressure loss and the pressure loss after the repeated wet and dry test.
For convenience of explanation, the type of the moisture absorbent contained in the partition plate and the spacing plate, the content of the moisture absorbent in the partition plate and the spacing plate, the type of the moisture absorbent contained in the partition plate and the moisture absorbent in the partition plate are simply shown. It is described as content.

  Moreover, in Table 1, the temperature exchange rate of the total heat exchanger and the value of the humidity exchange rate of the total heat exchanger are the values when the temperature exchange efficiency and the humidity exchange efficiency of the total heat exchanger of Example 1 are 100, respectively. Shown as a relative value. Since the temperature exchange efficiency, the humidity exchange efficiency, and the pressure loss before and after the wet and dry repeated test in the total heat exchanger of Example 1 satisfy the practically required levels without problems, the total heat exchanger of Example 1 is Adopted as a standard.

In the performance evaluation of the temperature exchange rate of the total heat exchanger, no change was observed between the total heat exchangers of Examples 1 to 10 and Comparative Examples 1 to 3.
In the performance evaluation of the humidity exchange efficiency of the total heat exchanger, the total heat exchanger of Examples 2 to 10, that is, both the partition plate and the spacing plate contain a hygroscopic agent, and the adhesive contains lithium chloride. The moisture exchange efficiency of the total heat exchanger contained shows a value of 88% or more with respect to that of the total heat exchanger of Example 1, and the humidity exchange of the total heat exchangers of Comparative Examples 1 to 3 It was higher than efficiency. Furthermore, the humidity conversion efficiency of the total heat exchangers of Examples 1 to 8 in which the content of lithium chloride in the adhesive is 10% or more stably shows high humidity exchange efficiency. More than 90% of that of the total heat exchanger.

Examples 1 to Examples in which the amount of lithium chloride contained in the partition plate is 4 g / m ² and the content of lithium chloride in the adhesive is 33 wt%, 20 wt%, 10 wt%, and 5 wt%, respectively. The humidity exchange efficiencies of the total heat exchangers of 3 and Example 9 were 100%, 98%, 95% and 88%, respectively, and as the content of lithium chloride in the adhesive increased, the total heat exchanger's It turned out that the humidity exchange efficiency becomes high.

Further, Example 1 in which the amount of lithium chloride contained in the adhesive is 33 wt%, and the lithium chloride content of the partition plate is 4 g / m ² , 2 g / m ^2, and 8 g / m ² , respectively. The humidity exchange efficiencies of the total heat exchangers of Example 4 and Example 5 are 100%, 90%, and 110%, respectively. The higher the moisture absorbent content in the partition plate, the higher the humidity exchange efficiency. It was.

Moreover, if the content of lithium chloride in the adhesive is 10% or more and the moisture absorbent content of the partition plate is 4 g / m ² or more, Examples 1 to 3 and Examples 5 to 8 will be described. It was found that the humidity exchange efficiency in the total heat exchanger of No. 1 was as high as 93% or more.
The humidity exchange efficiency of the total heat exchanger of Example 7 in which polyvinyl alcohol was used as the adhesive resin of the adhesive was 99%, and the total heat of Example 1 in which polyacrylic acid was used as the adhesive resin. It became almost the same value as the humidity exchange efficiency of the exchanger.

Moreover, the humidity exchange efficiency of the total heat exchanger of Example 1 and Example 6 in which the moisture absorbents of the partition plates are different is 100% and 93%, respectively, and the partition plate contains lithium chloride as a moisture absorbent from calcium chloride. It was found that the humidity was exchanged more efficiently. However, even if the hygroscopic agent contained in the partition plate was calcium chloride, the humidity exchange efficiency was not greatly deteriorated.
On the other hand, as described above, the humidity exchange efficiency values of the total heat exchangers of Comparative Examples 1 to 3 are all lower than the humidity exchange efficiency values of the total heat exchangers of Examples 1 to 10, and 88 % Or less. Moreover, the humidity exchange efficiency of the total heat exchanger of Comparative Example 1 showed a particularly low value, which was 40%.

  Moreover, in the evaluation of the pressure loss before and after the wet and dry repetition test, the total heat exchangers of Examples 1 to 7, Example 9 and Example 10 obtained a good judgment, and the total heat exchanger of Example 8 obtained a good judgment. It was. On the other hand, the pressure loss of the total heat exchangers of Comparative Examples 1 to 3 increased after the wet and dry repeated test, and was judged as defective.

Next, the evaluation result will be examined.
In the total heat exchangers of Examples 1 to 10, the partition plate contains a hygroscopic agent (lithium chloride or calcium chloride), and the adhesive contains lithium chloride. High moisture permeability. Therefore, by including lithium chloride in the adhesive, moisture permeability is secured even at the adhesive application site at the interface between the spacing plate and the partition plate, and it is avoided that the effective moisture permeable area of the partition plate is reduced. The

On the other hand, in the total heat exchangers of Comparative Example 2 and Comparative Example 3, since the adhesive does not contain lithium chloride, the moisture permeability at the adhesive application site is impaired, and the effective moisture permeable area in the partition plate is reduced. It is judged.
Therefore, it is judged that the humidity exchange efficiency of Examples 1 to 10 is higher than the humidity exchange efficiency of the total heat exchangers of Comparative Examples 2 and 3 in which lithium chloride is not contained in the adhesive. Further, in Comparative Example 1, it is determined that the humidity exchange efficiency is remarkably reduced because the hygroscopic agent is not contained in the partition plate itself that intervenes the humidity exchange between the air supply and the exhaust.

In addition, the higher the amount of the moisture absorbent contained in the partition plate and the lithium chloride contained in the adhesive, the greater the moisture permeability of the partition plate and adhesive, and the higher the humidity exchange efficiency of the total heat exchanger. It is judged.
In particular, when the content of lithium chloride in the adhesive is 10 wt% or more, it is judged that the moisture permeability of the adhesive can be sufficiently obtained. Moreover, it is judged that the moisture permeability of a partition plate is fully acquired when content of the hygroscopic agent contained in a partition plate is 4 g / m < ² > or more.

Moreover, in manufacture of the total heat exchanger of Example 1- Example 10, when a partition plate is match | combined with the tip part of the space | interval plate to which the adhesive agent was apply | coated, it contains in each of a partition plate and a space | interval plate. A deliquescent hygroscopic agent is dissolved in the adhesive.
When the hygroscopic agent is dissolved in the adhesive, the concentration of the hygroscopic agent in the adhesive increases, while the solubility of the hygroscopic agent decreases, so-called salting out effect occurs. Will be increased. As a result, the adhesive is prevented from entering the inside of the partition plate and the spacing plate, and polyacrylic acid and polyvinyl alcohol as the adhesive resin are sufficiently left at the interface with the partition plate and the spacing plate. To be judged.

  Therefore, since the space between the partition plate and the spacing plate is fixed stably and firmly, the shape of the total heat exchanger is stabilized without change even after repeated wet and dry tests, and the increase in pressure loss is suppressed. It is judged.

  On the other hand, in Comparative Examples 1 to 3 in which the salting-out effect cannot be expected, the adhesive enters the inside of the partition plate and the spacing plate, so that the adhesive resin remaining at the interface between the partition plate and the spacing plate is reduced, and the adhesive strength is reduced. Weaken. In addition, as a result of the wet and dry repetition test, it was determined that the first and second base materials of the partition plate and the spacing plate repeatedly expanded and contracted, and the positional relationship between the partition plate and the spacing plate was shifted to increase the pressure loss. Is done.

  Here, even if the content of lithium chloride in the mixture in the adhesive is further increased in advance, the viscosity of the adhesive is increased, but it becomes difficult to uniformly apply the adhesive to the interval plate due to the viscosity. Therefore, it is not preferable. When the content of lithium chloride in the mixture exceeds 33 wt%, it becomes difficult to uniformly apply the adhesive to the tip of the spacing plate.

  In addition, since the adhesive to which the crosslinking agent is added has improved water resistance, as shown in the performance test result of the total heat exchanger in Example 8, the increase in pressure loss after the wet and dry repeated test is most suppressed. It is judged.

  The total heat exchanger according to the present invention includes a hygroscopic agent composed of an alkali metal salt or alkaline earth metal salt having deliquescence, and a partition between the partition plate 4 having high moisture permeability and the spacing plate 7 has a carboxyl group or It is integrated with the adhesive 8 which is an aqueous solution of a mixture containing lithium chloride in a water-soluble nonionic resin as an adhesive resin having at least one hydroxyl group and low toxicity and low odor. . In addition, as the adhesive resin, polyacrylic acid and polyvinyl alcohol having strong adhesive strength and versatility are used.

Therefore, according to the total heat exchanger of the present invention, since the adhesive contains lithium chloride, the adhesive has high moisture permeability, and without reducing the effective moisture permeable area in the divider, the divider plate And the gap plate can be integrated.
Moreover, since the moisture permeable film | membrane inferior to moisture permeability like the conventional total heat exchanger is not required, humidity exchange efficiency can be improved. In particular, when the content of the hygroscopic agent contained in the partition plate is 4 g / m ² or more, the moisture permeability of the partition plate 4 is sufficiently obtained, and the humidity exchange efficiency can be further improved. Moreover, if the content of lithium chloride in the adhesive 8 is 10 wt% or more and 33 wt% or less, the moisture permeability of the adhesive 8 is sufficient, and the humidity exchange efficiency can be further improved, and at the same time The partition plate 4 and the spacing plate 7 can be integrated by the adhesive 8 applied to the surface.

  Further, since the adhesive 8 is an aqueous solution of a mixture of lithium chloride and a water-soluble nonionic resin as an adhesive resin having low toxicity and low odor, it has an odor like a conventional total heat exchanger. And can be produced without the need for cumbersome processes such as removing harmful organic solvents.

  Further, at the interface between the partition plate 4 and the spacing plate 7, the deliquescent hygroscopic agent contained in each of the partition plate 4 and the spacing plate 7 is dissolved in the adhesive 8 to produce a salting-out effect, thereby causing the adhesive. And the adhesive 8 does not penetrate into the partition plate 4 and the spacing plate 7, so that the partition plate 4 and the spacing plate 7 are stably and firmly bonded to each other, and after repeated wet and dry tests. The increase in pressure loss can be suppressed. That is, it is possible to obtain a reliable total heat exchanger 1 that does not increase pressure loss even if it is arranged in an environment where humidity and temperature are changed.

In addition, by using polyacrylic acid and polyvinyl alcohol, which have strong adhesiveness as the adhesive resin, the adhesive 8 can be easily and inexpensively procured, and the space between the partition plate 4 and the spacing plate 7 is stable. And the manufacturing cost of the total heat exchanger firmly bonded can be reduced.
In addition, by using the adhesive 8 to which a crosslinking agent is added, it is possible to further suppress an increase in pressure loss after the wet and dry repeated test.

  In the above description, the respective contents of the hygroscopic agent in the partition plate 4 and the spacing plate 7 have been described as being equivalent, but the respective contents of the hygroscopic agent in the partition plate 4 and the spacing plate 7 are It may be different.

It is a perspective view of the total heat exchanger by this invention. In the total heat exchanger shown by FIG. 1, it is sectional drawing to which the junction part of the partition plate and the space | interval board was expanded. It is a perspective view of the unit component member of the total heat exchanger by this invention.

Explanation of symbols

  1 Total heat exchanger, 4 partition plates, 7 spacing plates.

Claims (5)

A partition plate having a gas-shielding property and a spacing plate for maintaining a spacing between the partition plates, the two types of airflows flowing through the partition plate, and the sensible heat of the two types of airflows through the partition plate And a total heat exchanger for exchanging latent heat,
The partition plate and the spacing plate contain a hygroscopic agent composed of at least one of a deliquescent alkali salt or an alkaline earth metal salt,
The partition plate and the spacing plate are bonded to each other with an adhesive made of an aqueous solution of a mixture containing lithium chloride in a water-soluble nonionic resin containing at least one of a carboxyl group and a hydroxyl group. Total heat exchanger.   The total heat exchanger according to claim 1, wherein the water-soluble nonionic resin is either polyacrylic acid or polyvinyl alcohol.   The total heat exchanger according to claim 1 or 2, wherein a crosslinking agent is contained in the adhesive. The total heat exchanger according to any one of claims 1 to 3, wherein the content of the hygroscopic agent in the partition plate is 4 g / m ² or more.   The total heat exchanger according to any one of claims 1 to 4, wherein a content of the lithium chloride in the mixture is 10 wt% or more and 33 wt% or less.

Images