JPH11108409A - Material for total heat exchange element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve moisture absorption desorption capacity and to improve total enthalpy heat-exchange efficiency by a method wherein the cellulose fibers of a base are coated with a moisture absorbent for an ammonite consisting mainly of a calcium carbonate and zeolite containing an aluminum hydrate and an alumina sodium silicate. SOLUTION: Air flow passages 1 and 2 in an orthogonal state are formed of a total enthalpy heat-exchange element 3 to effect sensible heat exchange by utilizing a temperature difference between outdoor air A and indoor air B and latent heat-exchange by a humidity difference. An adsorbent for the element 3 consists of an ammonite consisting mainly of a calcium carbonate and zeolite containing an aluminum hydrate and an alumina sodium silicate. The chemicals are mixed in a given ratio to prepare slurry and the slurry is applied on the surface of a cellulose paper. Since the produced material is not a deliquescent material but has high moisture absorption desorption performance, moisture absorption capacity is saturated during a stop of operation and vapor condensation and dripping of water do not occur even when a limit water capacity of cellulose fibers is low.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a total heat exchange element in a total heat exchanger for performing sensible heat exchange by a temperature difference and latent heat exchange by a humidity difference between two fluids (for example, outdoor air and indoor air). The present invention relates to a material for a total heat exchange element to be used.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 1, a total heat exchanger includes a sensible heat exchange between two fluids (for example, outdoor air A and indoor air B) due to a temperature difference, and a latent heat exchange due to a humidity difference. In other words, total heat exchange) is performed, but the passages 1 and 2 through which the two fluids A and B flow respectively.
Is constituted by a total heat exchange element 3 for performing total heat exchange.

[0003] Since the total heat exchanger element is required to have high moisture absorption / desorption performance, various materials have been conventionally used as the material for the total heat exchange element.

[0004] For example, as disclosed in Japanese Patent Publication No. 52-15071, a total heat exchange element in which a solution of a water-soluble polymer substance to which lithium halide is added is impregnated or painted in a gas-permeable porous body. Materials have been proposed.

[0005]

However, in the case of the above-mentioned known materials for a total heat exchange element, lithium halide used as a hygroscopic agent has excellent hygroscopicity but is also a deliquescent substance. Therefore, if a large amount of moisture in the air is absorbed during high humidity, especially when the operation of the total heat exchanger is stopped, the shape will be deformed and the fluid path will not be sufficiently secured, or water will drop from the total heat exchange element. Failure may occur.

When the amount of lithium halide as a moisture absorbing agent is reduced in consideration of the occurrence of the above-mentioned problems, the moisture absorbing performance is reduced and latent heat exchange becomes insufficient.
There is a problem that the total heat exchange efficiency is reduced.

[0007] The present invention has been made in view of the above points, and an object of the present invention is to provide a material for a total heat exchange element having high moisture absorption / desorption performance by using a moisture absorbent which is not a deliquescent substance. It is assumed that.

[0008]

The material for a total heat exchange element according to the invention of the present application (the invention of claim 1) solves the above-mentioned problems, and is based on cellulose fiber and mainly composed of calcium carbonate. It is constituted by applying a hygroscopic agent composed of shell fossil and at least one of zeolite containing aluminum hydroxide and sodium alumina silicate.

In the case of the material for a total heat exchange element having the above-mentioned structure, it is not a deliquescent material but a zeolite containing shell fossil containing calcium carbonate as a main component and aluminum hydroxide and sodium alumina silicate having high moisture absorption / desorption performance. Since at least one kind of the moisture absorbent is used, the moisture absorption capacity is saturated when the operation is stopped, and no dew condensation or water dripping occurs even when the limit water holding amount of the cellulose fiber is small. .

[0010] Although the moisture absorbing ability is slightly inferior to that of a deliquescent substance such as lithium halide, the shell fossil, aluminum hydroxide and sodium alumina silicate used as the moisture absorbent in the present invention have many pores. Since it is possible to fix one of the cellulose fibers while maintaining the pore structure as it is, the ability to absorb and desorb moisture is maintained, and the ability to absorb and desorb moisture is further improved by coating the cellulose fibers. The heat exchange efficiency will be improved.

Further, shell fossils, aluminum hydroxide and sodium alumina silicate used as a moisture absorbent in the present invention are flame-retardant substances, and are applied with cellulose fibers to impart flame retardancy. Can be.

Although lithium halide is highly corrosive to metals, shell fossils, aluminum hydroxide, and sodium alumina silicate used as a moisture absorbent in the present invention are neutral substances and thus have no corrosiveness. .

In the present invention, shell fossils, which are used as a hygroscopic agent, are composed of various nektons, planktons, algae, seaweeds and the like consisting of calcareous and siliceous materials, which are concentrated and alive due to crustal deformation. Today, fish and shellfish and organic substances are not fossils but corrosive-soluble and are crystalline, and have excellent gas adsorption performance to adsorb acidic, neutral, basic toxic gases and odorous gases. When used as a total heat exchange element, it absorbs toxic gas and odorous gas contained in outdoor air, so that these toxic gas and odorous gas do not enter the room.

Incidentally, the material for the total heat exchange element of the present invention (that is, the one using shell fossil, aluminum hydroxide and sodium alumina silicate as the moisture absorbent) and the conventionally known material for the total heat exchange element (that is, the moisture absorbent) The results of FIG. 2 were obtained by comparing the moisture absorption / desorption performance of the sample with that using lithium halogen. Here, after maintaining at a temperature of 20 ° C. and a humidity of 90% for a predetermined time, a temperature of 20 ° C. and a humidity of 45% are used.
% For a predetermined time, a moisture absorption / desorption performance test was performed. According to this, it can be seen that the total heat exchange element material of the invention of the present application can obtain a great increase in the amount of absorbed moisture as compared with the conventionally known one, and also shows good dehumidification performance.

When a general-purpose flame retardant such as guanidine phosphate or guanidine sulfamate is added as in the invention of claim 2, the flame retardancy is further improved.

[0016] As in the third aspect of the present invention, when a molding improving material made of a synthetic resin is added, strength and moldability are improved.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION A total heat exchange element material according to an embodiment of the present invention is used as a total heat exchange element in a total heat exchanger shown in FIG.

The total heat exchanger has two fluids (for example,
The air flow passages 1 and 2 in the orthogonal state through which the outdoor air A and the indoor air B flow are formed by the total heat exchange elements 3 and 3, and the sensible heat exchange between the outdoor air A and the indoor air B due to the temperature difference. And a latent heat exchange by a humidity difference, and the total heat exchange element 3 is required to have high moisture permeability and low air permeability.

The material for a total heat exchange element according to the embodiment of the present invention comprises 65% by weight of cellulose fiber and 15% by weight.
And a small amount of a general-purpose flame retardant.

The hygroscopic agent is composed of shell fossil containing calcium carbonate as a main component, zeolite containing aluminum hydroxide and sodium alumina silicate, and these are mixed at a predetermined ratio to prepare a slurry.

The molding enhancer is mixed with the slurry to improve the fixation of the moisture absorbent to the cellulose fibers and to improve the strength of the cellulose fibers. Examples of the molding enhancers include polyethylene, polypropylene, and polyethylene. Synthetic resin materials such as terephthalate are used, and polyethylene terephthalate having flame resistance is particularly preferable.

The general-purpose flame retardant is also mixed with the slurry, and guanidine phosphate, guanidine sulfamate, or the like is used.

Then, the above-mentioned slurry is applied to the surface of a cellulose paper to obtain a material for a total heat exchange element.

The material for the total heat exchange element obtained as described above is not a deliquescent substance but a shell fossil mainly composed of calcium carbonate having high absorption and desorption performance, aluminum hydroxide and sodium alumina silicate. Since the hygroscopic agent containing zeolite is used, the hygroscopic capacity is saturated when the operation is stopped, and no dew condensation or water dripping occurs even when the limit water holding amount of the cellulose fiber is small.

Although the moisture absorbing ability is slightly inferior to that of lithium deliquor, which is a deliquescent substance, shell fossil, aluminum hydroxide and sodium alumina silicate used as a moisture absorbing agent in the present embodiment are many fine particles. Since it has pores, it is possible to fix one of the cellulose fibers in a state in which the pore structure is maintained as it is, so that the moisture absorbing and desorbing ability is maintained. As a result, the total heat exchange efficiency is improved.

Further, shell fossil, aluminum hydroxide and sodium alumina silicate used as a moisture absorbent in the present embodiment are flame-retardant substances, and are coated with cellulose fibers to impart flame retardancy. can do.

Although lithium halide is highly corrosive to metals, shell fossils, aluminum hydroxide, and sodium alumina silicate used as a moisture absorbent in the present embodiment are corrosive due to neutral substances. Not.

In the present embodiment, shell fossils used as a moisture absorbent are acidic, neutral, basic toxic gases,
Since it has excellent gas adsorption performance to adsorb odorous gas, it absorbs toxic gas and odorous gas contained in outdoor air when used as a total heat exchange element, and these toxic gas and odorous gas enter the room. Disappears.

Incidentally, the total heat exchange element according to the embodiment of the present invention (that is, one using shell fossil, aluminum hydroxide and alumina sodium silicate as a moisture absorbent);
The results of FIG. 2 were obtained by comparing the moisture absorption / desorption performance of a conventionally known total heat exchange element (that is, one using lithium lithium as a moisture absorbent). Here, the temperature 20
After holding at a temperature of 90 ° C. and a humidity of 90% for a predetermined time, holding at a temperature of 20 ° C. and a humidity of 45% for a predetermined time was repeated to perform a moisture absorption / desorption performance test. According to this, it can be seen that the total heat exchange element of the invention of the present application can obtain a large increase in the amount of absorbed moisture as compared with a conventionally known element, and also shows good dehumidification performance. Therefore, high moisture permeability is exhibited.

The cellulose fiber is 65 to 80% by weight.
, The moisture absorbent in the range of 5 to 15% by weight, and the molding improver in the range of 10 to 20% by weight, the same operation and effect as in the present embodiment can be obtained.

[0031]

According to the invention of the present application (the invention of claim 1),
Since it is not a deliquescent material but a humectant consisting of at least one of shell fossils containing calcium carbonate as a main component having high moisture absorption / desorption performance and zeolite containing aluminum hydroxide and sodium alumina silicate, When the operation is stopped, the hygroscopic capacity is saturated, and there is an excellent effect that no dew condensation or water dripping occurs even when the critical water retention amount of the cellulose fiber is small.

Further, although the hygroscopic ability is slightly inferior to that of lithium deliquor, which is a deliquescent substance, the shell fossil, aluminum hydroxide and sodium alumina silicate used as the hygroscopic agent in the present invention have many pores. Since it is possible to fix one of the cellulose fibers while maintaining the pore structure as it is, the ability to absorb and desorb moisture is maintained, and the ability to absorb and desorb moisture is further improved by coating the cellulose fibers. Heat exchange efficiency is improved.

Further, shell fossils, aluminum hydroxide and sodium alumina silicate used as a moisture absorbent in the present invention are flame-retardant substances, and are applied with cellulose fibers to impart flame retardancy. Can be.

Although lithium halide is highly corrosive to metals, shell fossils, aluminum hydroxide, and sodium alumina silicate used as a moisture absorbent in the present invention are neutral substances and thus have no corrosiveness. .

The shell fossil used as a moisture absorbent in the present invention has excellent gas adsorption performance of adsorbing acidic, neutral and basic toxic gases and odorous gases, and thus was used as a total heat exchange element. In this case, the toxic gas and the odorous gas contained in the outdoor air are adsorbed, and the toxic gas and the odorous gas do not enter the room.

When a general-purpose flame retardant such as guanidine phosphate or guanidine sulfamate is added, the flame retardancy is further improved.

As in the third aspect of the present invention, when a molding improving material made of a synthetic resin is added, strength and moldability are improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a general total heat exchanger.

FIG. 2 is a characteristic diagram comparing the moisture absorption and desorption performance of a material for a total heat exchange element according to an embodiment of the present invention with a conventional material for a total heat exchange element.

[Explanation of symbols]

 Reference numerals 1 and 2 denote air passages, and 3 denotes a total heat exchange element.

Claims (3)

[Claims] 1. A hygroscopic agent comprising a cellulose fiber as a base and a fossil shell containing calcium carbonate as a main component and at least one zeolite containing aluminum hydroxide and sodium alumina silicate is applied. Material for total heat exchange element. 2. The material for a total heat exchange element according to claim 1, wherein a general-purpose flame retardant such as guanidine phosphate or guanidine sulfamate is added. 3. The material for a total heat exchange element according to claim 1, wherein a molding improving material made of a synthetic resin is added.