HK1120105B - Total heat exchanging element and total heat exchange apparatus - Google Patents

Description

Total heat exchange element and total heat exchanger

Technical Field

The present invention relates to a total heat exchange element and a total heat exchanger that are provided in an air conditioner, a ventilator, or the like and perform total heat exchange of latent heat and sensible heat between two air having different temperatures and humidities.

Background

In the past, there has been a total heat exchange element 10 as shown in fig. 1, the total heat exchange element 10 including: the first laminar air flow path 4; a second laminar air flow path 5 laminated on the first laminar air flow path 4 and perpendicular to the first laminar air flow path 4; a partition member 1 for partitioning the first and second air flow paths 4 and 5; a spacing member 2 for forming a first air flow path and a second air flow path and for maintaining the spacing between the spacing members 1 and 1; an adhesive 3 for bonding the spacer member 1 and the spacer holding member 2; the total heat exchange element 10 exchanges latent heat and sensible heat between the first air 6 flowing through the first laminar air flow path 4 and the second air 7 flowing through the second air flow path 5 via the spacer member 1.

Since the partition member 1 is a medium for exchanging latent heat and sensible heat between the first and second air 6, 7, the heat transfer performance and moisture permeability of the partition member 1 greatly affect the efficiency of exchanging sensible heat and latent heat. In addition, as a material of the space holding member 2, paper using cellulose fiber (pulp) as a material is generally used in view of cost.

In order to impart moisture permeability to the spacer member 1, a moisture absorbent (moisture permeable agent) is usually added. As the moisture absorbent, alkali metal salts, alkaline earth metal salts, and the like represented by lithium chloride, calcium chloride, and the like are used as water-soluble moisture absorbents. As the water-insoluble moisture absorbent, a powdery moisture absorbent such as silica gel or an ion exchange resin of strong acid and strong base is used (for example, see patent documents 1, 2, and 3).

In addition, since it is particularly required to reduce the amount of gas such as CO2 that passes through the entire heat exchange element 10 between the first and second air 6, 7, the spacer member 1 is required to have high gas barrier properties in addition to the moisture permeability (moisture absorption) performance.

As a material for a spacer member having high gas barrier properties, the following proposals have been made: pulp fibers that have been beaten finely (see patent document 4, for example), paper made of microfibrillated cellulose added as a filler (see patent document 5, for example), a material that blocks pores by applying a water-soluble resin such as polyvinyl alcohol to the surface of a spacer member (paper) (see patent document 6, for example), and the like.

Further, in the bonded portion between the spacer member 1 and the space holding member 2 at the end of the total heat exchange element 10, since the adhesive is not sufficiently applied, when a gap is present between the two sheets, air leaks from the gap, mixes with air in another flow path, and CO2 and the like also leaks, and therefore, it is required that no gap is generated. In order to ensure fire safety, a flame retardant or the like is added to the spacer member 1 and the spacer holding member 2.

As the adhesive used for bonding the spacer member 1 and the space holding member 2, an aqueous solvent type adhesive is mainly used. This is because, when an organic solvent-based binder is used, desorption of the organic solvent itself remaining in the binder and odor associated with the desorption occur, which is not preferable as a total heat exchange element for an air conditioner, and a complicated and expensive auxiliary facility such as an apparatus for recovering the organic solvent is required in a production facility of the total heat exchange element 10, resulting in an increase in cost.

Patent document 1: japanese patent application laid-open No. 2829356

Patent document 2: japanese unexamined patent publication Hei 10-153398

Patent document 3: japanese laid-open patent publication No. 2003-251133

Patent document 4: international publication No. 2002/099193 pamphlet

Patent document 5: japanese patent application laid-open No. 3791726

Patent document 6: japanese unexamined patent application publication No. 2001-027489

However, the actual humidity exchange efficiency measured after the production of the total heat exchange element 10 is lower than the humidity exchange efficiency expected from the measurement result of the moisture permeability of the spacer member 1 alone in the total heat exchange element 10 in which the water-soluble moisture absorbent is added to the spacer member 1. This phenomenon does not occur in the spacer member made of a resin sheet or the like, and is a phenomenon inherent in the spacer member 1 made of paper using cellulose fibers to which a water-soluble moisture absorbent is added as a raw material.

The reason for this phenomenon is considered to be due to the following mechanism as a cause of the decrease in the actual humidity exchange efficiency. That is, the spacer member 1 and the spacer holding member 2 are made of a material having a liquid absorbing property (in the present specification, the term "liquid absorbing property" means a property of absorbing a solute dissolved between water molecules together with water molecules in order to distinguish from a property of selectively absorbing only water molecules, and in the case of absorbing water in a substance, for example, a case of chemically selecting only water molecules to be adsorbed on a surface of a substance by a functional group or the like and then binding them to the inside, a case of absorbing water by capillary phenomenon of a porous substance and physically absorbing water together with a solute, a case of absorbing water in a part of a super absorbent resin such as a sodium acrylate copolymer and the like and absorbing water in an aqueous solution together with a dissolved solute, and the like, but in the present specification, water absorption by capillary phenomenon and water absorption of an aqueous solution are referred to as "liquid absorption"), when the moisture absorbent is a water-soluble moisture absorbent, when a water-soluble binder is applied to bond the spacer member 1 and the spacer member 2, which are bonded members, are bonded to each other while absorbing water of the water-soluble binder.

At this time, the water-soluble moisture absorbent added to the spacer member 1 is dissolved while coming into contact with the water of the water-solvent-based binder, and diffuses into the water, whereby the water-impregnated portion from the spacer member 1 to the water-solvent-based binder or the spacer holding member 2 is lost. Due to this loss, the amount of the water-soluble moisture absorbent in the partition member 1 decreases, and the actual humidity exchange efficiency of the total heat exchange element 10 decreases as compared with the humidity exchange efficiency of the partition member 1 alone.

The humidity exchange efficiency is greatly affected in a low humidity environment where the effect of improving the moisture permeability by adding a water-soluble moisture absorbent is particularly large, and the humidity exchange efficiency is remarkably reduced in the low humidity environment. As a result, not only the humidity exchange efficiency or the total heat exchange efficiency is reduced, but also the humidity exchange efficiency and the total heat exchange efficiency are different between a high humidity environment and a low humidity environment. This means that the total heat exchange efficiency of the total heat exchanger varies depending on the environmental conditions of the air, and as a user of the total heat exchanger, calculation of the amount of recovered heat per year and subsequent estimation of the amount of energy saved becomes difficult and undesirable.

In order to confirm that the above phenomenon actually occurs, the spacer member 1 to which lithium chloride as a water-soluble moisture absorbent was added and the spacer member 2 to which guanidine sulfamate was added as a flame retardant were bonded by a vinyl acetate resin emulsion binder as a water solvent-based binder, and the distribution state of chloride ions in the cross section of the bonded portion was observed by fluorescent X-ray analysis.

Fig. 2 and 3 show the observation results. The luminous point in the figure is the distribution portion of the water-soluble moisture absorbent, but the water-soluble moisture absorbent is distributed not only in the spacer member but also to the corners of the spacer member. Therefore, the above phenomenon actually occurs, and this is considered to be a cause of the decrease in the humidity exchange rate.

As a countermeasure against this phenomenon, it has been attempted to prevent the performance from being degraded by increasing the amount of addition of the water-soluble moisture absorbent in the spacer member 1 in advance so that the amount of addition corresponds to the amount of loss of the water-soluble moisture absorbent. However, there is a limit to the amount of the water-soluble moisture absorbent that can be added to the spacer member 1, and since as much water-soluble moisture absorbent as possible has been added to improve the performance, it is difficult to further increase the amount of the water-soluble moisture absorbent corresponding to the amount of the loss.

Further, when a large amount of water-soluble moisture absorbent is added to the inside of the spacer member 1, the strength of the spacer member 1 is lowered, and in the manufacturing process of the total heat exchange element 10, the spacer member 1 absorbs moisture and softens, so that the handling performance in the manufacturing process is very poor, and the total heat exchange element 10 may not be manufactured.

Although it is conceivable to use a water-insoluble moisture absorbent as the moisture absorbent to be added to the spacer member 1, the water-insoluble moisture absorbent is difficult to be added to the spacer member 1 as compared with a water-soluble moisture absorbent, and thus the processing cost is increased. In addition, when an organic solvent-based binder in which a water-soluble moisture absorbent is insoluble is used for bonding the spacer member 1 and the spacer member 2, as described above, problems occur in the production facility, such as Volatile Organic Compounds (VOC) and odor.

Disclosure of Invention

The present invention has been made in view of the above problems, and an object thereof is to obtain a total heat exchange element and a total heat exchanger which do not emit an organic solvent or an odor, which have a small scale of production equipment, and which have less loss of a water-soluble moisture absorbent from a partition member in a process of manufacturing the element.

In order to solve the above problems and achieve the object, a total heat exchange element according to the present invention includes: a spacer member which is a member for spacing the laminated first and second laminar air flow paths and to which a water-soluble moisture absorbent is added; a space holding member that forms the first and second layered air flow paths and holds a space between the space members; an adhesive for bonding the spacer member and the space holding member; characterized in that the binder is a water-soluble binder impregnated with a water-soluble moisture absorbent.

According to the total heat exchange element of the present invention, although the water-soluble moisture absorbent flows from the spacer member to the water-soluble binder when the water-soluble binder is bound to the spacer member during the manufacturing process, the water-soluble moisture absorbent is impregnated into the water-soluble binder, and therefore the water-soluble moisture absorbent reversely penetrates from the water-soluble binder to the spacer member, and the flow of the water-soluble moisture absorbent from the spacer member is offset, so that the moisture absorption performance of the total heat exchange element is not lowered.

Further, since the water-soluble moisture absorbent is impregnated in the water-soluble binder, and the bonded portion (binder) between the spacer member and the spacer holding member has moisture permeability (moisture absorption), the humidity exchange efficiency or the total heat exchange efficiency is improved as in the case where the humidity exchange area of the spacer member is increased.

Further, since the adhesive itself has moisture permeability, even if the amount of application of the adhesive is increased, the moisture permeability of the entire heat exchange element is not reduced, and by increasing the amount of application of the adhesive, the reliability of adhesion between the spacer member and the space holding member is improved, the durability of the element itself is improved, and the gaps in the adhesion portion are clogged, and the CO2 permeation amount is reduced.

Drawings

Fig. 1 is a perspective view showing the structure of a total heat exchange element of the prior art and the present invention.

Fig. 2 is a diagram showing an electron microscope (SEM) photograph of a cross section of a bonded portion of a spacer member and a spacer member according to the related art.

Fig. 3 is a diagram showing distribution of moisture absorbent obtained by fluorescent X-ray analysis of a cross section of a bonded portion of a spacer member and a space holding member according to the related art.

Fig. 4 is an enlarged cross-sectional view of a bonded portion of the spacer member and the space holding member in embodiment 1.

Fig. 5 is a perspective view showing a unit structural member of the total heat exchange element of the present invention.

Fig. 6 is an enlarged cross-sectional view of a bonded portion of the spacer member and the space holding member of embodiment 2.

Fig. 7 is a perspective view of a state where a top plate of the total heat exchanger to which the total heat exchange element of the present invention is mounted is removed.

Description of reference numerals:

1, 21 spacer member

2 space holding member

3, 23 Binder (adhesive part)

4 first laminar air flow path

5 second laminar air flow path

6 first air

7 second air

10, 20 total heat exchange element

10a unit structural member

100 total heat exchanger

Detailed Description

The embodiments of the total heat exchange element and the total heat exchanger according to the present invention will be described in detail below with reference to the accompanying drawings. The present invention is not limited to these embodiments.

Embodiment 1.

Fig. 1 is a perspective view showing the structure of the overall heat exchange element of the present invention. As shown in fig. 1, the overall heat exchange element 10 includes: first laminar air flow paths 4, 4; second laminar air flow paths 5, 5 laminated between the first laminar air flow paths 4, 4 and orthogonal to the first laminar air flow paths 4, 4; a sheet-like spacer member 1 for spacing the first and second air flow paths 4 and 5 from each other; a corrugated sheet-like interval holding member 2 for forming the first and second air flow paths and holding the interval between the interval members 1, 1; an adhesive 3 for bonding the spacer member 1 and the spacer member 2; latent heat and sensible heat are exchanged between the first air 6 flowing through the first laminar air flow path 4 and the second air 7 flowing through the second air flow path 5 via the partition member 1. In the embodiment, the interval holding member 2 is formed in a corrugated shape, but the interval holding member 2 may be a sheet bent in a rectangular wave shape or a triangular wave shape, a plurality of plate-like sheets, or the like, for example, as long as the interval holding member 2 can hold a predetermined interval between the interval members 1, 1.

Fig. 4 is an enlarged cross-sectional view of a bonded portion of the spacer member 1 and the space holding member 2 of embodiment 1. The spacer member 1 is formed by refining cellulose fibers (pulp) to ensure an air permeability of 200 seconds/100 cc or more and has a weight of about 20g/m²About 4g/m is added to the special processed paper of the porous, liquid-absorbent raw material of (2)²The moisture absorbent is a member made of water-soluble and deliquescent lithium chloride. The spacer member 1 may be made of a nonwoven fabric which is a porous liquid-absorbent material. Further, a flame retardant may be added to the spacer member 1.

The spacer 2 has a weight per unit area of about 40g/m²The white, one-side glossy and high-quality paper as a porous, liquid-absorbent material. As the spacer member 1 and the spacer holding member 2, flame retardant paper to which a flame retardant is added may be used as long as it has liquid absorption properties capable of absorbing both moisture in the binder and a moisture absorbent impregnated in the moisture during bonding. The water-soluble moisture absorbent may be added to the space holding member 2 in advance.

As the material of the spacer member 1 and the spacer member 2, a material capable of widely diffusing the aqueous solution absorbed in the members is preferably used. For example, a material having liquid-absorbing properties may be used in which a non-liquid-absorbing material and a liquid-absorbing material are bonded together, and the material may have liquid-absorbing properties on only one side, or may have liquid-absorbing properties on both sides. In the case of using flame-retardant paper as a material, since the moisture absorbent and the flame retardant come into contact in the member, it is necessary to confirm that the added moisture absorbent and flame retardant do not react to cause a decrease in their functions.

As the adhesive for bonding the spacer member 1 and the spacer member 2, a vinyl acetate resin emulsion adhesive (solid content 40%) which is an aqueous solvent adhesive containing water as a main solvent was used.

In the present invention, the water-soluble moisture absorbent is impregnated in advance in the aqueous solvent-based binder. The water-soluble moisture absorbent impregnated in advance in the water-soluble binder includes, in addition to lithium chloride as an alkali metal salt, calcium chloride, urea, alginic acid produced from seaweed or the like, alginates, mucopolysaccharides such as carageenan, and the like as an alkaline earth metal salt, and is lithium chloride in embodiment 1, which is the same as the water-soluble moisture absorbent added to the spacer member 1.

In the case where the water-soluble moisture absorbent added to the spacer member 1 and the water-soluble moisture absorbent impregnated in the water-soluble binder are the same, when the water-soluble binder is bonded to the spacer member 1, the water-soluble moisture absorbents dissolve the same in each other. Further, since the binder is impregnated with the water-soluble moisture absorbent, the concentration difference of these aqueous solutions is small, and this effect prevents the water-soluble moisture absorbent from flowing out of the spacer member 1. As a result, moisture permeability lost by the bleed phenomenon can be recovered, humidity exchange efficiency and total heat exchange efficiency can be improved, and the difference between the efficiency in a high humidity environment and the efficiency in a low humidity environment can be reduced.

Since lithium chloride is water-soluble, when it is added to the vinyl acetate resin emulsion binder, lithium chloride may be directly put into the vinyl acetate resin emulsion binder and stirred until dissolved.

As the binder, an emulsion dispersion type binder of other resins (vinyl acetate, vinyl acetate-acrylate copolymer, ethylene-vinyl acetate copolymer (EVA), acryl-vinyl acetate, etc.) may be used, and a water-soluble polymer resin such as polyvinyl alcohol (PVA) or acrylic acid (PAA) may be used.

However, when lithium chloride is added to a solvent of the aqueous solution, that is, a binder component, coagulation (salting out) may occur, resulting in a precipitate. When the precipitates are generated, the application of the binder is hindered, and the intended moisture absorption may not be obtained. Further, since the binder itself absorbs moisture and the binder resin is always in contact with water, it is preferable to use, for example, a binder that causes a crosslinking reaction at the time of completion of bonding or a water-resistant grade emulsion binder that causes little re-emulsification by water.

In the case of a polymer resin, after the completion of bonding, a crosslinking reaction having water resistance is caused, or the molecular weight is made as large as possible to prevent re-dissolution into water. Further, when lithium chloride is directly dissolved in the binder, the temperature of the binder rises due to the heat of dissolution of lithium chloride, and therefore, when the high-temperature stability of the resin binder is unstable, the lithium chloride is gradually dissolved in a small amount while cooling the binder. Alternatively, the lithium chloride powder may be dissolved in water to prepare a saturated solution, and the saturated solution may be mixed with the binder after lowering the temperature thereof.

The total heat exchange element 10 is produced by bonding the spacer member 1 and the spacer holding member 2 with the aqueous solvent type adhesive 3. The total heat exchange element 10 is produced by first producing a unit structure 10a of one piece of spacer and one piece of spacer as shown in fig. 5 by a corrugating machine which machines a single-sided corrugated board or the like, applying a water-solvent-based adhesive 3 to the ridge portion of the spacer 2 of the unit structure 10a by a roll coater, then rotating the next unit structure 10a by 90 °, superposing and bonding the next unit structure 10a, and superposing and bonding the next unit structure 10a thereon to produce the total heat exchange element 10 as shown in fig. 1.

Embodiment mode 2

Fig. 6 is an enlarged cross-sectional view of a bonded portion of the spacer member 21 and the space holding member 2 of embodiment 2. The spacer member 21 has a basis weight of about 20g/m formed so as to secure an air permeability of 200 seconds/100 cc or more²The special processed paper of (1) is not added with a water-soluble moisture absorbent.

Spacing member2, the same weight per unit area as that of embodiment 1 is about 40g/m²The white high-quality paper with single-sided gloss is obtained. The binder 23 is a binder in which a binder of lithium chloride is impregnated in a vinyl acetate resin emulsion binder. At this time, the addition amount was adjusted so that the amount of impregnated lithium chloride reached the total amount of the amount of lithium chloride added to the spacer member 1 of embodiment 1 and the amount of lithium chloride impregnated in the binder 3 of embodiment 1. As in embodiment 1, the members (raw materials), additives (reagents), assembly methods, and the like used for the total heat exchange element 20 can be variously modified.

If the total heat exchange element 20 is produced by applying the water-based binder impregnated with the water-based moisture absorbent in an amount to be contained in the spacer member 21 to the spacer member 21 without adding the water-based moisture absorbent to the spacer member 21 in advance by utilizing the reverse osmosis effect of the water-based moisture absorbent from the water-based binder 23 to the spacer member 21, and bonding the spacer member 21 to the total heat exchange element 20, the total heat exchange element 20 having the same moisture absorption performance as that when the water-based moisture absorbent is added to the spacer member 21 in advance can be produced. In this way, the step of adding the water-soluble moisture absorbent to the spacer member 21 can be omitted. Therefore, deterioration of workability such as softening of the spacer member 21 during the assembly process can be prevented, and the production efficiency of the total heat exchange element can be improved.

Further, if the agent other than the water-soluble moisture absorbent, for example, a flame retardant is water-soluble and is not reactive with the water-soluble moisture absorbent or the water-solvent type binder, the agent may be impregnated into the water-solvent type binder together with the water-soluble moisture absorbent and diffused into the spacer member 21 and the spacer holding member 2. Thus, a process of adding a flame retardant to the spacer member 21 or the space holding member 2 is not required. In this way, if the total heat exchange element 20 is manufactured by immersing a water-soluble reagent, which is to be immersed in the spacer member 21 or the spacer member 2 to obtain any effect, in the water-soluble moisture absorbent in order to manufacture the total heat exchange element, it is possible to significantly save labor.

[ Total Heat exchanger ]

Fig. 7 is a perspective view with the top plate 101a of the total heat exchanger 100 incorporating the total heat exchange elements 10, 20 of the present invention removed. The total heat exchanger 100 of the present invention is housed in a rectangular parallelepiped housing 101 provided with a removable top plate 101 a. Indoor side suction port 104 and discharge port 106 are provided on one of the opposite side surfaces of casing 101, and outdoor side suction port 105 and discharge port 107 are provided on the other side surface. Between suction port 104 and discharge port 107, and between suction port 105 and discharge port 106, are communicated by exhaust flow path 108 and intake flow path 109, respectively, which are detachably accommodated in casing 101.

A blower 110 including an impeller 121, a motor 126, and a cover 211 is provided in the exhaust flow path 108, and discharges indoor air from the discharge port 107 to the outside. A blower 111 including an impeller 121, a motor 126, and a cover 211 is provided in the air supply flow path 109, and air from outside is supplied from the air outlet 106 to the inside of the room.

The total heat exchange elements 10 and 20 of the present invention are inserted from an insertion opening 115 provided on the other side surface of the housing 101, and are provided in the intermediate portions of the exhaust air flow path 108 and the supply air flow path 109 so that the first laminar air flow path 4 (see fig. 1) communicates with the exhaust air flow path 108 and the second laminar air flow path 5 (see fig. 1) communicates with the supply air flow path 109. After the total heat exchange elements 10 and 20 are inserted, the insertion port 115 is closed by the cap 115 a.

When the blowers 110 and 111 are operated, the indoor air is sucked in through a duct not shown in the figure from the suction port 104 on the indoor side as shown by arrow a, passes through the exhaust flow path 108 and the first laminar air flow paths 4 of the total heat exchange elements 10 and 20 as shown by arrow B, and is discharged to the outside from the discharge port 107 on the outdoor side as shown by arrow C by the exhaust blower 110.

Further, the air is sucked from the outdoor side suction port 105 through a duct not shown in the figure as indicated by an arrow D, passes through the air supply passage 109 and the second laminar air flow paths 5 of the total heat exchange elements 10 and 20 as indicated by an arrow E, is blown out from the indoor side blow-out port 106 by the air supply blower 111 as indicated by an arrow F, and is supplied to the room through a duct not shown in the figure. At this time, in the total heat exchange elements 10 and 20, the total heat exchange is performed between the exhaust air flow B (first air 6, see fig. 1 and 7) and the intake air flow E (second air 7, see fig. 1 and 7) via the partition member 1, and the exhaust heat is recovered, thereby reducing the load of cooling and heating.

[ examples of Prior Art ]

As the aqueous solvent type adhesive, an adhesive obtained by mixing an appropriate amount of water with a vinyl acetate resin emulsion adhesive was used in the spacer member 1 and the spacer member 2 which are the same as in embodiment 1. The total heat exchange element was produced under the same conditions as in example 1, such as the assembly method. The amount of the aqueous solvent binder to be applied is adjusted to the same extent as in embodiment 1 in terms of the amount of the solid content of the aqueous solvent binder to be applied.

[ comparative example ]

In order to confirm the loss of the water-soluble moisture absorbent added to the spacer member 1 by the water-soluble binder, a spacer member 1 similar to that of embodiment 1 was used, and a spacer member 2 having a shape similar to that of embodiment 1 was produced using a resin (PET resin) having a low water absorption property. For the adhesive, a pressure sensitive adhesive of an aqueous solvent type is used.

The unit structural member 10a shown in fig. 5 was produced by applying a pressure-sensitive adhesive to the ridge portion of the spacer made of PET resin, sufficiently drying the adhesive, evaporating the added water, and then overlapping and pressure-bonding the spacer 1. Next, a pressure-sensitive adhesive was applied to the other edge portion of the unit structure member 10a, and the pressure-sensitive adhesive was sufficiently dried, and after the water was evaporated, the next unit structure member 10a was rotated by 90 ° and was overlapped and pressure-bonded, thereby producing a total heat exchange element.

By fabricating the total heat exchange element by using the spacer made of the PET resin, the water-soluble moisture absorbent does not flow out of the spacer 1 even if water is absorbed in the spacer 1 in the fabrication process of the element. By comparing the performance of the total heat exchange element with that of the conventional example, it was confirmed that the water-soluble moisture absorbent was lost from the structural member 1 only by the moisture of the binder.

Table 1 shows the values of the humidity exchange rates measured under the same test conditions (environmental conditions, air volume conditions, or measurement conditions) for the total heat exchange elements of the same size prepared in embodiment 1, embodiment 2, and the prior art example and the comparative example.

[ Table 1]

Humidity exchange Rate [% ]

	High humidity/Low humidity (variable ratio)	Structure of the product
			Embodiment 1	65％/58％(90％)	Spacer member with added moisture absorbent + binder with impregnated moisture absorbent
Embodiment mode 2	64％/58％(90％)	Binder for impregnating moisture absorbent
			Examples of the prior art	56％/30％(54％)	Spacer member with moisture absorbent added
Comparative example	54％/52％(97％)	Addition of moisture absorbent spacer member + measures to prevent loss of moisture absorbent by binder

In order TO measure the difference in humidity exchange efficiency between a high humidity environment and a low humidity environment, the high humidity environment was measured under the conditions based on the exchange efficiency measurement conditions (summer conditions) of JIS B8628 (total heat exchanger), and the low humidity environment was measured under the conditions based on the exchange efficiency measurement conditions (cooling conditions) of ARI (american AIR conditioning and refrigeration society) 1060-RATING AIR-TO-AIR energy recovery vehicle engineering equilibrium. The ratio of the humidity exchange efficiency in the low humidity region to the humidity exchange efficiency in the high humidity region is also described in ().

As shown in table 1, the total heat exchange elements of embodiment 1 and embodiment 2 are excellent in the absolute value of the humidity exchange efficiency and the difference in the exchange efficiency between the high humidity environment and the low humidity environment, compared to the conventional examples. In addition, the absolute value of the humidity exchange efficiency in the high humidity environment is not much different from that in the comparative example compared with the conventional example, but the humidity exchange efficiency in the low humidity environment is greatly improved. This is because of the difference in the effects caused by the loss of the moisture absorbent. In embodiment 1, it can be seen that the water-soluble moisture absorbent is prevented from flowing out of the spacer member 1, because the humidity exchange efficiency is approximately the same as that of the comparative example with respect to the change in the environment.

Industrial applicability of the invention

As described above, the total heat exchange element according to the present invention is useful for a heat exchange ventilator that performs ventilation of a building or ventilation of a moving body such as an automobile or a train, and is particularly suitable for a total heat exchanger that performs total heat exchange for exchanging latent heat and sensible heat at the same time.

Claims (31)

1. A total heat exchange element comprising:

a spacer member which is a member for spacing the laminated first and second laminar air flow paths and to which a water-soluble moisture absorbent is added;

a space holding member that forms the first and second laminar air flow paths and holds a space between the space members;

an adhesive for bonding the spacer member and the space holding member;

it is characterized in that the preparation method is characterized in that,

the binder is an aqueous solvent-based binder impregnated with a water-soluble moisture absorbent.

2. The total heat exchange element according to claim 1, wherein the spacer member and the spacer holding member are formed of a liquid-absorbent material that absorbs moisture and a solute thereof.

3. The total heat exchange element according to claim 2, wherein the liquid-absorbent material is a porous material that absorbs moisture and its solute by capillary action.

4. The total heat exchange element of claim 3 wherein the porous material is paper or nonwoven fabric made from cellulose fibers.

5. The total heat exchange element of claim 1 wherein a water-soluble moisture absorbent is added to said spacing and retaining member.

6. The total heat exchange element of claim 1 wherein a flame retardant is added to the spacing member.

7. The total heat exchange element of claim 1 wherein a flame retardant is added to said spacing and retaining member.

8. The total heat exchange element according to claim 1, wherein the water-soluble moisture absorbent added to the spacer member and the water-soluble moisture absorbent impregnated in the aqueous solvent type binder are the same moisture absorbent.

9. The total heat exchange element of claim 1 wherein a water soluble flame retardant is impregnated in said aqueous solvent based binder.

10. The total heat exchange element of claim 1, wherein the water-soluble moisture absorbent is any one of deliquescent alkali metal salts, deliquescent alkaline earth metal salts, or a mixture thereof.

11. The total heat exchange element of claim 1, wherein the water soluble moisture absorption agent is any one of urea, carageenan, alginic acid, alginates, or mixtures thereof.

12. The total heat exchange element according to claim 1, wherein the aqueous solvent type binder is a resin emulsion binder having water as a main solvent.

13. The total heat exchange element according to claim 1, wherein the aqueous solvent type binder is a resin emulsion dispersion type binder in which water is used as a main solvent.

14. The total heat exchange element of claim 13, wherein the aqueous solvent type binder is any one of a vinyl acetate resin emulsion binder, a vinyl acetate-acrylate copolymer resin emulsion binder, an ethylene-vinyl acetate copolymer resin emulsion binder, or a mixture thereof.

15. The total heat exchange element of claim 1, wherein the aqueous solvent type binder is an emulsion binder having water resistance.

16. A total heat exchange element comprising:

a spacer member for spacing the first and second laminar air flow paths of the stack;

a space holding member that forms the first and second laminar air flow paths and holds a space between the space members;

an adhesive for bonding the spacer member and the space holding member;

it is characterized in that the preparation method is characterized in that,

the binder is an aqueous solvent-based binder impregnated with a reagent containing a water-soluble moisture absorbent impregnated into the spacer member.

17. The total heat exchange element according to claim 16, wherein the spacer member and the spacer holding member are formed of a liquid-absorbent material that absorbs moisture and a solute thereof.

18. The total heat exchange element of claim 17, wherein the liquid absorbent material is a porous material that absorbs moisture and its solute by capillary action.

19. The total heat exchange element of claim 18 wherein the porous material is paper or nonwoven fabric made from cellulosic fibers.

20. The total heat exchange element of claim 16 wherein a water-soluble moisture absorbent is added to said spacing and retaining member.

21. The total heat exchange element of claim 16 wherein a flame retardant is added to the spacing member.

22. The total heat exchange element of claim 16 wherein a flame retardant is added to said spacing and retaining member.

23. The total heat exchange element of claim 16 wherein a water soluble flame retardant is impregnated in said aqueous solvent based binder.

24. The total heat exchange element of claim 16 wherein the water soluble moisture absorbent is any one of a deliquescent alkali metal salt, a deliquescent alkaline earth metal salt or a mixture thereof.

25. The total heat exchange element of claim 16, wherein the water soluble moisture absorption agent is any one of urea, carageenan, alginic acid, alginates, or mixtures thereof.

26. The total heat exchange element of claim 16, wherein the aqueous solvent type binder is a resin emulsion binder having water as a main solvent.

27. The total heat exchange element according to claim 16, wherein the aqueous solvent type binder is a resin emulsion dispersion type binder in which water is used as a main solvent.

28. The total heat exchange element of claim 27, wherein the aqueous solvent type binder is any one of a vinyl acetate resin emulsion binder, a vinyl acetate-acrylate copolymer resin emulsion binder, an ethylene-vinyl acetate copolymer resin emulsion binder, or a mixture thereof.

29. The total heat exchange element of claim 16, wherein the aqueous solvent type binder is an emulsion binder having water resistance.

30. A total heat exchanger comprising a total heat exchange element, the total heat exchange element comprising:

a spacer member which is a member for spacing the laminated first and second laminar air flow paths and to which a water-soluble moisture absorbent is added;

a space holding member that forms the first and second laminar air flow paths and holds a space between the space members;

an adhesive for bonding the spacer member and the space holding member;

it is characterized in that the preparation method is characterized in that,

the binder is an aqueous solvent-based binder impregnated with a water-soluble moisture absorbent.

31. A total heat exchanger comprising a total heat exchange element, the total heat exchange element comprising:

a spacer member for spacing the first and second laminar air flow paths of the stack;

a space holding member that forms the first and second laminar air flow paths and holds a space between the space members;

an adhesive for bonding the spacer member and the space holding member;

it is characterized in that the preparation method is characterized in that,

the binder is an aqueous solvent-based binder impregnated with a reagent containing a water-soluble moisture absorbent impregnated into the spacer member.