JP2004294052A - Element for total enthalpy heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To keep performance as a chemical filter over a long period of time. <P>SOLUTION: This element for a total enthalpy heat exchanger includes: a partition plate having a total enthalpy heat exchange capability and a capability for phase converting a target gas and partitioning between supply air and exhaust: a spacing plate for air supply having adsorption capability for the target gas and corrugated to keep the space between the partition plates; and a spacing plate for exhaust corrugated to keep the space between the spacing plates. The air supply spacing plate and the exhaust spacing plate are alternately stacked perpendicularly to each other through the partition plates. The partition plate is formed of a paper sheet obtained by paper making activated carbon of 40 to 70% and paper manufacturing fiber of 30 to 60%. The air supply spacing plate and the exhaust spacing plate are formed of one of acid gas adsorbing member, alkali gas adsorbing member and organic gas adsorbing member. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an element for a total heat exchanger having a gas purification function.

When controlling the air quality in a room, if the concentration of the outside air of the target gas is higher than the concentration required in the room, it is necessary to perform purification by a filter (outside air treatment).
As a conventional technology corresponding to this demand, purification by a chemical filter (outside air treatment) is widely used in an outside air treatment air conditioner of a clean room and the like.
The exchange (ventilation) of the air between the room air and the outside air results in heat loss when air conditioning is performed to control the temperature in the room, which consumes extra energy for air conditioning.

As a conventional technique for energy saving, there is a total heat exchanger that recovers sensible heat (temperature) and latent heat (moisture) from air discharged indoors to outdoors, and is widely used for air conditioning and ventilation equipment in general buildings. I have.
The heat exchange element of the total heat exchanger is generally used for a long time after installation without replacement.
Next, the integration of the chemical filter and the total heat exchange element will be described. With these integrations, when building is newly constructed, space is saved, and when renovating, if there is already a total heat exchanger and you want to add the function of outside air treatment later, if you only need to replace the element part of the total heat exchanger It has the advantage of being easier.

This can be realized by using a chemical filter material so that the total heat exchange element comes into contact with the air supply path from the outside air to the room.
JP-A-11-189999

However, in actuality, the “element for a total heat exchanger having a gas purification function” that integrates the functions of the chemical filter and the total heat exchanger as described above has not been commercialized.
The reason is that there is a problem with the life of the chemical filter, that is, the purifying performance gradually decreases as the chemical filter is used, so it is necessary to replace it when the required purifying performance cannot be maintained. It is thought to be related to

When the chemical filter is integrated with the total heat exchanger, the element for the total heat exchanger having the purifying function is replaced when the performance as the filter is reduced. That is, it is considered that the life of the filter has not been realized due to the problem.
Patent Document 1 discloses a total heat exchanger paper composed of papermaking fibers, microfibrillated cellulose, and moisture-absorbing and desorbing powder, which has the performance required for a partition plate of a total heat exchanger element. It has been disclosed.

However, Patent Literature 1 does not relate to extending the service life by utilizing the phase shift of the target gas in the elements of the air supply-side interval plate, the exhaust-side interval plate, and the partition plate that constitute the above-described total heat exchanger element. Absent.
An object of the present invention is to provide an element for a total heat exchanger having a gas purifying function, which can maintain the performance as a chemical filter for a long period of time, that is, can prolong its life.

  The invention according to claim 1 has a total heat exchange capability and a capability of phase-shifting the target gas, has a partition plate for separating air supply and exhaust, and has an adsorption capability for the target gas, and the partition plates have An air-supply spacing plate having a corrugated shape for maintaining an interval between the gas and an exhausting space plate having a corrugated shape having a desorbing or adsorbing ability for the target gas and maintaining an interval between the partition plates. It is characterized in that the air spacing plate and the exhaust spacing plate are alternately laminated orthogonally via the partition plate.

According to a second aspect of the present invention, in the element for a total heat exchanger according to the first aspect, the target gas is an acidic gas, an alkali gas, or an organic gas.
According to a third aspect of the present invention, in the element for a total heat exchanger according to the first aspect, the partition plate is formed of paper formed by forming 40 to 70% of activated carbon and 30 to 60% of papermaking fibers. It is characterized.

The invention according to claim 4 is the element for a total heat exchanger according to claim 1, wherein the air supply space plate and the exhaust space plate are any one of an acid gas adsorption member, an alkali gas adsorption member, and an organic gas adsorption member. It is characterized by comprising.
According to a fifth aspect of the present invention, in the element for a total heat exchanger according to the fourth aspect, the acidic gas adsorbing member used for the air supply spacing plate is mainly composed of 50 to 75% of activated carbon and 25 to 50% of papermaking fibers. Characterized in that an alkali compound is impregnated on a sheet of paper to be supported on activated carbon.

According to a sixth aspect of the present invention, in the element for a total heat exchanger according to the fourth aspect, the acidic gas adsorbing member used for the exhaust spacing plate is mainly composed of activated carbon 25 to 75% and papermaking fibers 25 to 75%. Characterized in that an alkaline compound is impregnated on paper to be processed and is supported on activated carbon.
According to a seventh aspect of the present invention, in the element for a total heat exchanger according to the fourth aspect, the alkali gas adsorbing member used for the air supply spacing plate contains 50 to 75% of activated carbon and 25 to 50% of papermaking fibers as main components. The paper is characterized by being impregnated with an acidic compound and supported on activated carbon.

The invention according to claim 8 is the element for a total heat exchanger according to claim 4, wherein the alkali gas adsorbing member used for the exhaust spacing plate is mainly composed of activated carbon 25 to 75% and papermaking fiber 25 to 75%. The paper is characterized in that an acidic compound is impregnated on paper to be processed and is supported on activated carbon.
According to a ninth aspect of the present invention, in the element for a total heat exchanger according to the fourth aspect, the organic gas adsorbing member used for the air supply spacing plate is mainly composed of 50 to 75% of activated carbon and 25 to 50% of papermaking fibers. Characterized in that the paper is made of

According to a tenth aspect of the present invention, in the element for a total heat exchanger according to the fourth aspect, the organic gas adsorbing member used for the exhaust spacing plate is mainly composed of activated carbon 25 to 75% and papermaking fibers 25 to 75%. It is characterized by being made of paper to be processed.
In the present invention, the combination of the three elements constituting the element for the total heat exchanger, ie, the air supply space plate, the exhaust space plate, and the partition plate, utilizes the phase shift phenomenon of the target gas in the three elements. Thus, the performance as a chemical filter can be maintained for a long time, and the life of the element for the total heat exchanger can be extended.

In addition, the required performance required for the element for a total heat exchanger, particularly the performance of transmitting moisture and shielding air, can be required for the partition plate.
On the other hand, in the present invention, by forming the partition plate from paper made of papermaking fibers and activated carbon, the performance of transmitting moisture and shielding air is satisfied.

  According to the present invention, since the air supply interval plate, the partition plate, and the exhaust interval plate that constitute the element for the total heat exchanger are configured to be able to utilize the phase shift phenomenon of the target gas at each site, the chemical filter is used as a chemical filter. Can be maintained for a long time, and the life of the element for the total heat exchanger can be extended.

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
FIG. 1 is a diagram showing a total heat exchanger element 1 according to one embodiment of the present invention.
The total heat exchanger element 1 according to the present embodiment has a total heat exchange capacity and a capacity to shift a target gas (acid gas, alkali gas, organic gas), and separates a supply air and an exhaust air from the partition plate 2. And an air supply spacing plate 3 having an adsorbing capability for the target gas and having a wavy shape for maintaining the interval between the partition plates 2, and having a desorbing or adsorbing capability for the target gas and providing an interval between the partition plates 2. An exhaust interval plate 4 having a corrugated shape to be kept is provided, and the air supply interval plate 3 and the exhaust interval plate 4 are alternately stacked alternately via the partition plate 2 at right angles.

  Here, the performance required for the partition plate 2 will be described. The partition plate 2 is required to have not only a phase shift effect but also an air shielding property as a main function. From the viewpoint of the phase shift effect, the larger the amount of activated carbon, the better. However, if the amount of the activated carbon is too large, the air shielding property cannot be satisfied, and the heat exchange element as a ventilation device cannot be realized. In order to satisfy the air shielding property, it is advantageous that the amount of the activated carbon is small, but if the amount of the activated carbon is small, the phase shift action is weakened.

In consideration of the above, the mixing ratio of the activated carbon in the partition plate 2 was determined. That is, the partition plate 2 is made of paper formed by papermaking of 40 to 70% of activated carbon and 30 to 60% of papermaking fibers. The mixing ratio of the partition plate 2 also considered the range that can be molded as paper.
First, the upper limit of activated carbon will be described. It was confirmed from the experimental data shown in Table 1 below that the air permeability was set to a value that could satisfy 100 seconds, and even if the activated carbon was 65%, there was room for the air permeability of 100 seconds. In consideration of the margin, the upper limit of the activated carbon was set to 70%.

  Next, the lower limit of activated carbon will be described. In the experimental data shown in Table 1 below, an example showing a phase shift effect at an activated carbon compounding ratio of 50% is shown. In order to satisfy the air shielding property, it is advantageous that the amount of the activated carbon is small, but if the amount of the activated carbon is small, the phase shift action is weakened. It is considered that if the mixing ratio of the activated carbon is excessively reduced, the phase shift action is hindered. Therefore, the lower limit of the activated carbon is set to 40% so that the phase shift function works effectively.

Here, the air permeability refers to the Gurley air permeability described in JIS P8117, and the higher the gas shielding index, the higher the performance (the more difficult it is to pass gas). Generally, the partition plate of the total heat exchanger is required to have a gas shielding property of 100 seconds or more in order to avoid cross contamination from the exhaust side to the supply side and to secure the performance as a ventilation device.
Therefore, in order to ensure an air permeability of 100 seconds, a partition plate was trial-produced with 50% and 65% of activated carbon in the papermaking fiber. Table 1 shows the results. Here, Experiment No. 1 was a paper sheet made of 50% papermaking fiber and 50% activated carbon, and Experiment Nos. 2 to 6 were a paper sheet made of 35% papermaking fiber and 65% activated carbon. is there. The papers of Experiment No. 2 to Experiment No. 6 were produced by making the pressure of the roller applied to the paper higher in the production of the partition paper than that of the paper of Experiment No. 1. As is clear from Experiment Nos. 2 to 6, it was confirmed that air permeability of 100 seconds was ensured even when the content of activated carbon was 65%. This makes it possible to enhance the adsorption and phase shift performance of the target gas.

Further, the air supply space plate 3 and the exhaust space plate 4 are formed of any one of an acid gas adsorption member, an alkali gas adsorption member, and an organic gas adsorption member.
First, the acidic gas adsorbing member is made of activated carbon carrying an alkali compound (for example, potassium carbonate, sodium carbonate, caustic soda, caustic potassium) and paper mainly containing papermaking fibers. It has the function of adsorbing.

  The mixing ratio of the acid gas adsorbing member in the paper is such that an alkaline compound is impregnated on paper mainly composed of 50 to 75% of activated carbon and 25 to 50% of papermaking fibers (total of both are 100%), and is carried on activated carbon. It was made. As for the compounding of the alkali compound, typically, 8 to 12% of an alkali compound (for example, potassium carbonate) is impregnated with respect to 50 to 75% of activated carbon and 25 to 50% of papermaking fibers (100% of both).

The upper limit of the blending of the alkali compound is an amount to which the alkali compound can be impregnated, and is in a range that does not hinder the shaping of the paper, and the more the blending of the alkali compound is, the higher the adsorption performance of the acidic gas is.
The advantage of reducing the amount of the alkali compound is mainly the production cost, but the lower limit is determined in order to effectively exhibit the acidic gas adsorption performance.

Next, the alkali gas adsorbing member is made of paper mainly containing activated carbon carrying an acidic compound (for example, a phosphoric acid compound or a sulfuric acid compound) and papermaking fibers, and adsorbs the alkali gas by the acidic compound. Has functions.
The compounding ratio of the alkali gas adsorbing member in the paper is such that an acidic compound is impregnated on a paper mainly composed of 50 to 75% of activated carbon and 25 to 50% of papermaking fibers (total of both are 100%) and is carried on activated carbon. It was made. For the compounding of the acidic compound, typically, 20 to 24% of the acidic compound (for example, phosphoric acid) is impregnated with respect to activated carbon 50 to 75% and papermaking fiber 25 to 50% (total 100%). .

The upper limit of the blending of the acidic compound is an amount to which the acidic compound can be impregnated, and is in a range where there is no problem in shaping the paper into a corrugated form. The greater the blending of the acidic compound, the higher the alkali gas adsorption performance.
The advantage of reducing the amount of the acidic compound is mainly the production cost, but the lower limit is set in order to effectively exhibit the adsorption performance of the alkali gas.

Next, the organic gas adsorbing member is made of a paper containing 50 to 75% of activated carbon and 25 to 50% of papermaking fibers as main components. The compounding ratio of the organic gas adsorbing member was set to a range in which the paper could be produced, and the upper and lower limits of the activated carbon were set to a range in which the organic gas adsorbing function could be exhibited.
In addition, the air supply spacing plate 3 and the exhaust spacing plate 4 are not limited in gas shielding properties, and the mixing ratio with the partition plate is changed in order to place importance on the adsorption performance.

Next, the feature of the present invention, that is, the phase shift effect and the contribution to prolonging the life will be described. There are the following two types of action in the exhaust spacing plate (the following 1) to 3) are common).
(1) The target gas is desorbed and released from the exhaust spacing plate. (2) The target gas is also retained by the exhaust spacing plate, increasing the adsorption capacity of the entire device. First, (1) the target gas is released from the exhaust spacing plate. Desorption and release will be described.

1) The target gas is adsorbed from the air (air supply) supplied to the room by the activated carbon mixed in the air supply interval plate (physical adsorption in fine voids of activated carbon. Including both chemisorption and physisorption by action).
2) The target gas is phase-shifted from the air supply gap plate to the partition plate by the concentration gradient of the target gas using the activated carbon mixed in the air supply gap plate and the partition plate as a medium.

3) The target gas is phase-shifted from the partition plate to the exhaust spacing plate due to the concentration gradient of the target gas, using the activated carbon mixed in the partition plate and the exhaust spacing plate as a medium.
4) The target gas phase-shifted to the exhaust spacing plate is released and released into the air exhausted outdoors, where the concentration of the target gas is low due to the concentration gradient.
From 1) to 4), the target gas adsorbed by the air-supply spacing plate is shifted in phase, and desorbed and released into the air exhausted by the exhaust-air spacing plate, so that the air-supplying spacing plate recovers its adsorption ability. And contributes to a longer life.

Next, a description will be given of (2) holding the target gas with the exhaust spacing plate.
1) The target gas is adsorbed from the air (air supply) supplied to the room by the activated carbon mixed in the air supply interval plate (physical adsorption in fine voids of activated carbon. Acid-alkali is used for activated carbon impregnated with chemicals) Including both chemisorption and physisorption by action).
2) The target gas is phase-shifted from the supply gap plate to the partition plate due to the concentration gradient of the target gas using the activated carbon mixed in the supply gap plate and the partition plate as a medium.

3) The target gas is phase-shifted from the partition plate to the exhaust spacing plate due to the concentration gradient of the target gas, using the activated carbon mixed in the partition plate and the exhaust spacing plate as a medium.
4) Even if the target gas phase-shifted to the exhaust spacing plate is not desorbed into the exhausted air, the adsorption capacity of the entire device including the air supply spacing plate, the partition plate, and the exhaust spacing plate is reduced by a single supply spacing plate. Greater than Germany. Therefore, within the range in which the phase shift of the target gas from the air supply spacer to the partition plate progresses, the air supply spacer recovers the adsorbing capacity, so that only the air supply spacer adsorbs the target gas. This contributes to a longer service life.

In the present invention, the following "adsorption capacity" is considered in expressing the ability to adsorb a target gas.
In the organic gas adsorption member, the ability to adsorb the organic gas as the target gas is governed by the capacity of the organic gas adsorption member to adsorb the target gas. The adsorption capacity is mainly governed by the amount of activated carbon (the amount of activated carbon = weighing × the mixing ratio of activated carbon).

In the alkali gas adsorbing member, since the acid is attached to the activated carbon, the effective surface area of the activated carbon contributing to the adsorption of the target gas, the alkali gas, is reduced, and the physical adsorption of the activated carbon in the fine voids is reduced.
Similarly, in the acidic gas adsorbing member, since the alkali is impregnated with the activated carbon, the effective surface area of the activated carbon that contributes to the adsorption of the target gas, the acidic gas, is reduced, and the physical adsorption of the activated carbon in the fine voids is reduced. Is done.

That is, it is expressed by the following equation in relation to the ability to adsorb the target gas.
Adsorption capacity = (adsorption capacity by activated carbon)-(reduction by acid (or alkali) impregnation)
For example, when the amounts of activated carbon are the same, the acidic gas adsorption member and the alkali gas adsorption member have smaller adsorption capacities than the organic gas adsorption member.
Next, a supplementary explanation of the requirements regarding the blending of activated carbon in the air supply interval plate, the partition plate, and the exhaust interval plate will be provided.

The compounding ratio of the three members needs to be an appropriate compounding ratio based on the performance required for each member and the relative adsorption capacity between the members.
(Partition plate)
The partition plate having a large restriction is as described for the partition plate 2.
In the phase shift action of the heat exchange element, the characteristic of the phase shift action of the partition plate is the most dominant factor, and the influence of the relative mixing ratio between the partition plate and the spacing plate is considered to be limited.

(Spacer)
(Performance commonly required for air supply and exhaust spacers)
As the content of activated carbon increases, the partition paper becomes softer. In the heat exchanger, in order to maintain airtightness between the heat exchange element and the housing that houses the heat exchange element, it is necessary to make the heat exchange element hard to lose its shape. For that purpose, a certain degree of rigidity is required for the spacing sheet, and an excessively large amount of activated carbon causes a problem. From this, the upper limit of the blending ratio of activated carbon was determined, and the upper limit of the blending of activated carbon was set to 75%.

(Air supply spacing plate)
In the air supply interval plate, adsorption of the target gas and phase shift action to the partition plate are required. Regarding the phase shift effect on the partition plate, if the adsorption capacity by activated carbon is increased in the air supply spacing plate, the specifications of the partition plate will eventually be restricted, and the phase shift effect of the target gas will peak out. Can be However, the air supply spacing plate has a function of adsorbing and purifying a target gas from air (air supply) supplied indoors by the contained activated carbon, and the function of the activated carbon is long-lasting. Larger and larger adsorption capacity is more desirable.

(Exhaust spacing plate)
As described above, there are two types of exhaust spacing plates, (desorption / release) and (adsorption / holding), for the target gas phase-shifted from the partition plate.
First, (suction / hold) will be described.
The exhaust spacing plate is required to have a phase shift effect from the partition plate and adsorb and retain the target gas, and it is more desirable for any of the effects to have a larger adsorption capacity by activated carbon.

(About the interrelationship between the air supply spacing plate and the exhaust spacing plate)
Regarding the amount of activated carbon in the air supply interval plate and the exhaust interval plate, in order for the target gas held in the partition plate to promptly shift the phase to the exhaust interval plate,
It is desirable that (adsorption capacity of the air supply spacing plate) ≦ (adsorption capacity of the exhaust spacing plate).
When combined with the requirements for the above-described air supply interval plate, it is typical to increase the mixing ratio of activated carbon in the air supply interval plate and the exhaust interval plate to be the same as much as possible. Reducing the amount of activated carbon is advantageous in giving characteristics that the element is less likely to lose its shape when the element becomes large (maintaining the airtightness between the element and the housing).

Next, (desorption / release) will be described.
In the case where the phase shift action from the partition plate and the desorption of the target gas are intended in the exhaust spacing plate, it is desirable that the desorption performance is high as long as the phase shift action can be ensured. Desorption performance is related to adsorption capacity.
(Conditions for desorption performance)
Here, as a general situation, a case is considered where the concentration of the target gas is such that introduced outside air> return air (= indoor average). In this case, in order to achieve the function of “adsorption-phase-shift-desorption”, the adsorption capacity of the exhaust spacing plate may be the same level as the suction capacity of the air supply spacing plate. In other words, the maximum suction capacity of the exhaust spacing plate may be the same as the suction capacity of the air supply spacing plate, and can be approximately expressed as follows.

(Adsorption capacity of exhaust interval plate) ≤ (Adsorption capacity of air supply interval plate)
(Conditions for exhibiting the phase shift effect)
On the other hand, if the adsorption capacity of the exhaust spacing plate is made extremely small, it is considered that the phase shift effect is hindered. Therefore, actually, the following is performed.
(Adsorption capacity of air supply interval plate) x (1/2) ≤ (adsorption capacity of exhaust interval plate)
Next, an example will be described below in which the element 1 for a total heat exchanger according to the present embodiment has the air supply space plate 3 and the exhaust space plate 4 changed according to the target gas. In each case, the amount of activated carbon was made equal between the air supply interval plate and the exhaust interval plate.

(First example)
The case where the target gas is ammonia gas (introduced outside air) will be described.
In this example, an alkali gas adsorbing member was used as the air supply spacing plate 3, and an acidic gas absorption member that desorbed ammonia (NH ₃ ) gas was used as the exhaust spacing plate 4.
Ammonia gas is adsorbed by the following reaction formula.

H ₃ PO ₄ + NH ₃ → NH ₄ H ₂ PO ₄
The compound of NH ₄ is decomposed in alkaline and separated as ammonia (NH ₃ ) gas. This is a principle used in a general NH ₃ analysis method.
Next, the operation of the present example will be described.
First, ammonia gas is adsorbed by the air supply spacing plate 3 and captured in the air supply spacing plate 3 as an NH ₄ H ₂ PO ₄ compound.

Next, the NH ₄ H ₂ PO ₄ captured by the air supply space plate 3 is phase-shifted to the activated carbon layer of the partition plate 2.
Next, the NH ₄ H ₂ PO ₄ captured by the air supply space plate 3 is further phase-shifted from the partition plate 2 to the exhaust space plate 4.
Next, NH ₄ H ₂ PO ₄ (a compound of NH ₄ ) is decomposed by the exhaust spacing plate 4, separated into its alkaline atmosphere as ammonia (NH ₃ ) gas by the exhaust spacing plate 4, and discharged outside. Release into the air.

As described above, the service life of the element 1 for a total heat exchanger according to the present example is extended.
In addition, about the activated carbon amount, since the air supply interval plate and the exhaust interval plate were made equal,
(Suction capacity of exhaust spacing plate) <(Suction capacity of air supply spacing plate)
(The alkali is attached to the activated carbon of the exhaust interval plate, and the adsorption capacity is smaller than that of the air supply interval plate.) This is more desirable than equal adsorption capacity.

(Second example)
A case where the target gas is SO ₂ or NO ₂ gas (introduced outside air) will be described.
In this example, an acidic gas adsorbing member was used as the air-supplying interval plate 3 and an acidic gas adsorbing member was used as the exhausting interval plate 4.
First, the case where the target gas is SO ₂ will be described.

First, oxidized by the activated carbon in the acid gas adsorption member of the desired gas SO _2, SO ₂ → SO ₄ captures ^2-in supply air spacers 3 in.
Next, the phase is shifted from the air supply interval plate 3 to the partition plate 2 by a concentration gradient.
Next, the phase is shifted from the partition plate 2 to the exhaust spacing plate 4 by a concentration gradient.
As described above, the adsorption capacity of SO ₂ is increased by the amount of the exhaust-side spacing plate 4 on the outlet side in addition to the amount of the inlet-side spacing plate 3 on the inlet side, and the long life of the element 1 for a total heat exchanger according to this example is increased. To contribute.

Next, the case where the target gas is NO ₂ will be described.
First, the object gas NO _2, to capture as NO ₂ in air supply spacers 3 in the supply side.
Next, the phase is shifted from the air supply interval plate 3 to the partition plate 2 by a concentration gradient.
Next, the phase is shifted from the partition plate 2 to the exhaust spacing plate 4 by a concentration gradient.
Next, a part of the NO ₂ obtained from the primary side is released into the air to be discharged outside as NO ₂ ⁻ and NO from the exhaust spacing plate 4 by utilizing the characteristics of the activated carbon.

Then, 1 is the remaining of the NO ₂ obtained from the primary side, but are attracted to the spacer board 4 exhaust in the form of NO _2, in addition to the inlet side of the air supply spacers 3, the outlet The suction capacity is increased by the space plate 4 for exhaust.
As described above, the action of the outlet-side exhaust spacing plate 4 with respect to the target gas NO ₂ contributes to the long life of the total heat exchanger element 1 according to the present embodiment.

(Third example)
The case where the target gas is an organic gas (introduced outside air) will be described.
In this example, an organic gas adsorption member was used as the air supply space plate 3, and an alkali gas adsorption member was used as the exhaust space plate 4.
Next, the operation of the present example will be described.

First, an organic gas, which is a target gas, is adsorbed by the air supply spacing plate 3.
Next, the adsorbed organic gas is phase-shifted from the air supply interval plate 3 to the partition plate 2.
Next, the organic gas in the partition plate 2 is phase-shifted to the exhaust spacing plate 4.
Next, it is detached from the exhaust spacing plate 4 on the exhaust side and released into the air that is discharged outdoors.
As described above, the service life of the element 1 for a total heat exchanger according to the present example is extended.

In addition, about the activated carbon amount, since the air supply interval plate and the exhaust interval plate were made equal,
(Suction capacity of exhaust spacing plate) <(Suction capacity of air supply spacing plate)
(Acid is attached to the activated carbon of the exhaust spacing plate, and the adsorption capacity is smaller than that of the air supply spacing plate). This is more desirable than equal adsorption capacity.
(Fourth example)
The case where the target gas is an organic gas (introduced outside air) will be described.

In this example, an organic gas absorbing member was used as the air supply spacing plate 3, and an organic gas absorption member was used as the exhaust spacing plate 4.
In the present example, the suction capacity on the secondary (exhaust) side is made equal to or smaller than the suction capacity on the primary (supply) side in the air supply space plate 3 and the exhaust space plate 4. Thus, the gas can be adsorbed by the supply space plate 3 having a large adsorption capacity, and the phase can be shifted to the exhaust space plate 4 having a small adsorption capacity to be released again.

Next, the operation of the present example will be described.
First, an organic gas (introduced outside air) as a target gas is adsorbed by the air supply spacing plate 3.
Next, the adsorbed organic gas is phase-shifted from the air supply interval plate 3 to the partition plate 2.
Next, the organic gas in the partition plate 2 is further phase-shifted to the exhaust spacing plate 4.
Next, it is detached from the exhaust spacing plate 4 on the exhaust side and released into the air that is discharged outdoors.

As described above, the service life of the element 1 for a total heat exchanger according to the present example is extended.
Even when the amount of activated carbon on the supply side = the amount of activated carbon on the exhaust side, (exhaust-side adsorption capacity) = (supply-side adsorption capacity), and the “adsorption-phase-shift-desorption” action is established, but (exhaust-side adsorption capacity). In order to satisfy (capacity) <(supply capacity on the air supply side), it is preferable to satisfy (amount of activated carbon on the exhaust side) <(amount of activated carbon on the air supply side).
(Fifth example)
The case where the target gas is acid gas (introduced outside air) will be described.

In this example, an acidic gas adsorbing member was used as the air supply spacing plate 3, and an alkali gas adsorption member was used as the exhaust spacing plate 4.
In comparison with the second example, the fifth example is suitable when the amount of NO ₂ gas is large.
Next, the operation of the present example will be described.
First, the target gas NO ₂ is captured by the air supply interval plate 3 as NO ₂ .

Next, the phase is shifted from the air supply interval plate 3 to the partition plate 2 by a concentration gradient.
Next, the phase is shifted from the partition plate 2 to the exhaust spacing plate 4 by a concentration gradient.
Next, a part of the NO ₂ obtained from the primary side is released into the air to be discharged outside as NO ₂ ⁻ and NO from the exhaust spacing plate 4 due to the characteristics of the activated carbon.
Then, the rest of the NO ₂ obtained from the primary side, although the adsorption to the spacing plate 4 exhaust in the form of NO _2, in addition to the inlet side of the air supply spacers 3, exhaust outlet The suction capacity is increased by the distance plate 4 for use.

As described above, the action of the outlet-side exhaust spacing plate 4 with respect to the target gas NO ₂ contributes to the long life of the total heat exchanger element 1 according to the present embodiment.
Next, a case where the target gas is SO ₂ will be described.
First, the target gas SO ₂ is captured in the air supply space plate 3.
The adsorbed SO ₂ is oxidized by the activated carbon in the air supply space plate 3 to be SO ₂ → SO ₄ ^2- .

Next, the phase is shifted from the air supply interval plate 3 to the partition plate 2 by a concentration gradient.
Next, the phase is shifted from the partition plate 2 to the exhaust spacing plate 4 by a concentration gradient.
As described above, the capacity to be adsorbed in the form of SO ₄ ²⁻ is increased by the suction space plate 3 on the outlet side in addition to the space plate 3 on the inlet side, and the suction capacity is increased. This contributes to a long life of the heat exchanger element 1.

(Test Example 1)
Next, the total heat exchange element 1 according to the present embodiment incorporates the total heat exchanger 5 as shown in FIGS. 3 and 4 and is installed in a building located along a main road in Chiba Prefecture, and subjected to an exposure test. An experiment was conducted to examine the purification performance and phase shift of NO ₂ as a target gas.
Here, the partition plate 2 was made of paper formed by papermaking with 50% of papermaking fibers and 50% of activated carbon, and the weighing was 175 g / m ² , the plate thickness was 0.60 mm, and the air permeability was 152 seconds. The gas supply spacing plate 3 and the exhaust spacing plate 4 were made of an acidic gas adsorbing member composed of paper containing 50 to 70% of activated carbon carrying potassium carbonate and 25 to 50% of papermaking fibers as main components.

In this example, in order to simplify the test conditions, SA (supply air) is connected to RA (return air) so that the air blown into the room returns to the total heat exchanger 5 (RA concentration = SA concentration). Description will be given as a modeled test apparatus 10.
Further, measurement points were provided at predetermined locations of OA (outside air), SA (supply air) and EA (exhaust), and a NOx meter 7 was attached to each of them to measure NO ₂ concentration (ppb) and NO concentration (ppb). .

First, the blower 6 takes in outside air (OA) containing high NO ₂ due to automobile exhaust gas at 40 m ³ / h, for example.
Next, it is evaluated whether or not the NO ₂ concentration is reduced in SA (air supply) with respect to OA (outside air).
Next, it is evaluated whether or not the NO ₂ concentration increases in EA (exhaust) with respect to RA (return air).
Generally, it is said that when NO ₂ is adsorbed and purified by activated carbon, NO is slightly released.

FIG. 4 shows the average concentration at 8:55 am to 9:00 am on a certain weekday at each measurement point.
Next, the test results will be considered.
First, the NO ₂ concentration of SA (supply air) as compared with the NO ₂ concentration in the introduction OA (outside air) are greatly reduced (OA46.2 → SA7.8), purifying the NO ₂ is the object gas The effect is shown.

From this, it can be seen that when outside air having a high NO ₂ concentration is introduced into a room due to automobile exhaust gas along a main road, the NO ₂ concentration is reduced and supplied to the room.
Next, the NO concentration in EA (exhaust) is slightly higher than the NO concentration in RA (return air = SA (supply)) (RA 22.6 → EA 25.9).
The NO concentration in SA (air supply) is not higher than OA (outside air) (SA = 22.6, OA = 32.6).

From these, NO ₂ is adsorbed on the total heat exchange element 1 on the air supply side, phase-shifted through the partition plate 2 and released to the exhaust side in the form of NO, increasing the NO concentration of EA (exhaust). It is thought that there is.
This explains that the phase shift phenomenon has occurred, and supports that the total heat exchange element 1 has the effect of extending the life of the performance as a purification filter.
(Test Example 2)
Next, the heat exchange performance of the element for a total heat exchanger according to the present invention will be described.

(About total heat exchange performance)
Table 2 shows indices for the heat exchange efficiency. These mean the rate of recovery from the air exhausted indoors to the outdoors to the air (air supply) supplied indoors by the heat exchanger. Equation (1) [sensible heat (temperature)], (2) ) Formula (latent heat (moisture)) and formula (3) [total heat (sensible heat + latent heat = temperature and moisture)].

(Test example of heat exchange performance)
Table 3 shows the specifications of the total heat exchanger element (the same element as the exposure test shown in FIG. 3 was used for the total heat exchanger element).

In Table 3,% of the mixing ratio represents a weight ratio. The percentage of alkali (potassium carbonate) in the acidic gas adsorbing member represents a weight ratio when the amount of the organic gas adsorbing member is 100%.
(Outline of heat exchange performance test)
The test apparatus 20 was installed as shown in FIG. By heating and humidifying the inside of the chamber 21 with the electric heater 22 and the humidifier 23, air having a higher temperature and a higher humidity than RA (return air) was supplied to the OA (outside air).

The output of the blower 24 of OA (outside air) -SA (air supply) was adjusted so as to be 40 m ³ / h at the outlet of SA (air supply).
Similarly, the output of the blower 25 of RA (return air) -EA (exhaust) was adjusted so as to be 40 m ³ / h at the outlet of EA (exhaust).
The temperature and humidity are continuously measured by arranging the temperature and humidity meters 26 at three points of OA (outside air), SA (supply air), and RA (return air), respectively. When the temperature and humidity at each point became stable, the values were read.

(Results and discussion)
Table 4 shows the temperature and humidity measured at each point, the absolute humidity converted from them, and the specific enthalpy.

  When the heat exchange efficiency was determined by the equations (1) to (3) based on the temperature and humidity measurement results, the values in Table 5 were obtained.

(Result of heat exchange performance test)
The temperature of SA (air supply) (30.0 ° C.) is lower than the temperature of OA (outside air) (35.1 ° C.), and the temperature of OA (outside air) (35.1 ° C.) and the temperature of RA (return air) ( 27.4 ° C.), indicating that the cold energy of RA (return air) is recovered and supplied to SA (air supply). This indicates the exchange of sensible heat (temperature).

The absolute humidity of SA (air supply) 0.0220 (kg / kg (DA)) is the absolute humidity of OA (outside air) (0.0239 kg / kg (DA)) and the absolute humidity of RA (return air) (0.0164 kg). / Kg (DA)), indicating that latent heat (moisture) has been exchanged.
The specific enthalpy of SA (air supply) 84.6 (kJ / kg (DA)) is the specific enthalpy of OA (outside air) (94.8 kJ / kg (DA)) and the specific enthalpy of RA (return air) (68.2 kJ). / Kg (DA)), indicating that the total heat (sensible heat and latent heat) has been exchanged.

Regarding the heat exchange efficiency, the temperature exchange efficiency was 66%, the humidity exchange efficiency was 26%, and the total heat exchange efficiency was 38%, indicating the performance of heat exchange (heat recovery) for sensible heat, latent heat, and total heat. .
From the above, it was confirmed that the tested total heat exchanger element had the heat exchange performance described above.

  Therefore, it was confirmed that the total heat exchanger using this contributes to energy saving from the intended heat exchange performance.

It is explanatory drawing which shows an example of the element 1 for total heat exchangers which concerns on this invention. It is an enlarged view which shows the principal part of the element 1 for total heat exchangers in FIG. FIG. ₂ is an explanatory diagram showing an outline of a test apparatus for incorporating a total heat exchanger element 1 in FIG. 1 in a total heat exchanger and examining NO ₂ purification performance and phase shift as a target gas. FIG. 4 is an explanatory diagram showing a NO ₂ concentration (ppb) and a NO concentration (ppb) at each measurement point of the test apparatus in FIG. 3. FIG. 2 is a schematic diagram of a test apparatus using a total heat exchanger incorporating the total heat exchanger element 1 in FIG. 1.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Total heat exchanger element 2 Partition plate 3 Air supply spacing plate 4 Exhaust spacing plate 5 Total heat exchanger 10, 20 Test equipment

Claims (10)

A partition plate that has a total heat exchange capability and a capability of shifting the phase of the target gas, and separates air supply and exhaust gas;
Having an adsorption capacity for the target gas, an air supply spacing plate having a wavy shape that maintains the spacing between the partition plates,
An exhaust spacing plate having a desorption or adsorption capacity for the target gas and having a wavy shape that maintains the spacing between the partition plates,
The element for a total heat exchanger, wherein the air supply space plate and the exhaust space plate are alternately laminated orthogonally via the partition plate.   2. The element for a total heat exchanger according to claim 1, wherein the target gas is an acidic gas, an alkali gas, or an organic gas.   2. The element for a total heat exchanger according to claim 1, wherein the partition plate is made of paper formed by forming 40 to 70% of activated carbon and 30 to 60% of papermaking fibers. element.   2. The element for a total heat exchanger according to claim 1, wherein the air supply space plate and the exhaust space plate are formed of any one of an acid gas adsorption member, an alkali gas adsorption member, and an organic gas adsorption member. Element for a total heat exchanger.   5. The element for a total heat exchanger according to claim 4, wherein the acidic gas adsorbing member used for the air supply spacing plate comprises an alkaline compound on paper mainly containing 50 to 75% of activated carbon and 25 to 50% of papermaking fibers. An element for a total heat exchanger, which is attached to and supported on activated carbon.   5. The element for a total heat exchanger according to claim 4, wherein the acidic gas adsorbing member used for the exhaust spacing plate has an alkali compound impregnated on a paper mainly composed of 25 to 75% of activated carbon and 25 to 75% of papermaking fibers. And an element for a total heat exchanger, which is supported on activated carbon.   5. The element for a total heat exchanger according to claim 4, wherein the alkali gas adsorbing member used for the air supply spacing plate comprises an acidic compound on a sheet mainly composed of 50 to 75% of activated carbon and 25 to 50% of papermaking fibers. An element for a total heat exchanger, which is attached to and supported on activated carbon.   5. The element for a total heat exchanger according to claim 4, wherein the alkali gas adsorbing member used for the exhaust spacing plate has an acidic compound impregnated on a paper mainly composed of 25 to 75% of activated carbon and 25 to 75% of papermaking fibers. And an element for a total heat exchanger, which is supported on activated carbon.   In the element for a total heat exchanger according to the fourth aspect, the organic gas adsorbing member used for the air supply space plate is made of a paper containing activated carbon 50 to 75% and papermaking fiber 25 to 50% as main components. An element for a total heat exchanger, characterized in that: In the element for a total heat exchanger according to claim 4, the organic gas adsorbing member used for the exhaust spacing plate is made of a paper containing activated carbon 25 to 75% and papermaking fiber 25 to 75% as main components. An element for a total heat exchanger, characterized by:

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