JP2000140625A - Adsorbent and air conditioner for vehicle using the adsorbent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure cooling capacity under a condition of low relative humidity. SOLUTION: This adsorbent S packed in an adsorption core is composed of a porous body having >=0.2 cm2/g fine pore volume occupied by the pores having >=1.0 nm to <=1.5 nm fine pore diameter. The porous body is obtained by firing a gel like solid obtained by hydrolyzing an amide bond-containing polymer using N,N-dimethylacryl amide as a raw material and tetramethoxy silane.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adsorbent for an adsorptive refrigeration system utilizing the fact that water is adsorbed and desorbed on an adsorbent by being cooled and heated.
The present invention relates to an adsorbent suitable for application to a vehicle air conditioner.

[0002]

2. Description of the Related Art Conventionally, an adsorption type refrigeration apparatus includes an adsorption core having an adsorbent for adsorbing water when cooled and releasing water when heated, an evaporating condenser for evaporating and condensing water. Is known. In such a refrigerating apparatus, when water is adsorbed by the adsorption core, the water evaporates in the evaporative condenser. At this time, the indoor air is cooled by circulating the heat exchange fluid cooled by heat exchange with water in the evaporative condenser to the indoor heat exchanger. Further, the adsorption core to which water is adsorbed is heated and is regenerated by desorbing water. At this time, the desorbed water is condensed in the evaporative condenser. When such an adsorption-type refrigeration apparatus is mounted on a vehicle or the like, as a heating source for desorbing water from the adsorption core, for example, engine cooling water (about 90 ° C.)
Is used. On the other hand, as a heat absorbing source for cooling the adsorption core and adsorbing water, for example, engine cooling water (about 30 ° C.) cooled in an outdoor heat exchanger or a separately provided vapor compression refrigeration cycle Low pressure side water (for example, 2
A heat exchange fluid cooled by about 0 to 25 ° C.) is used. Therefore, when the above-mentioned adsorption refrigeration apparatus is applied to an air conditioner for a vehicle, desorption and adsorption of water are performed in a range where the relative humidity near the adsorbent is 0.08 to 0.30.

[0003] Conventionally, as an adsorbent used in such an adsorption refrigerating apparatus, for example, silica gel obtained by firing silicon oxide has been used.

[0004]

However, when zeolite is used as the material of the adsorbent, it is necessary to heat the material to about 400 ° C. under atmospheric pressure in order to desorb the water once adsorbed. When the apparatus is mounted on a vehicle or the like, there is a problem in that it is difficult to obtain the amount of heat required to regenerate the adsorbent.

On the other hand, when the above-mentioned silica gel is used as the adsorbent, the pore diameter has a wide pore distribution width of 1.0 to 15.0 nm, but the pore diameter is 1.0 to 1.6 n.
Since the pore volume occupied by the pores of m is as small as 0.05 cm ³ / g, the amount of adsorbed water is small in the region where the relative humidity is low as described above, and sufficient evaporation from the heat exchange fluid passing through the evaporative condenser occurs. There was a problem that it was difficult to remove latent heat. Therefore, it is necessary to increase the amount of silica gel filled in the adsorption core in order to obtain a sufficient cooling capacity for cooling the passenger compartment. For this reason, there is a problem that the suction core becomes large and the mountability on the vehicle is not good.

Accordingly, the present invention has been made in view of the above points, and even in a region where the relative humidity is low near the adsorbent, a sufficient amount of water is desorbed to cool the passenger compartment. -It is intended to provide an adsorbent capable of performing adsorption.

[0007]

According to the first and second aspects of the present invention, the pore diameter is 0.6 nm.
The pore volume occupied by pores having a diameter of 1.6 nm or less is 0.2 c.
It is characterized by being made of a porous material having a m ³ / g or more.
When a porous body having a pore diameter smaller than 0.6 nm is used as the adsorbent, water is adsorbed by the adsorbent even when the relative humidity near the adsorbent is lower than 0.08, Regeneration of the adsorbent requires a large amount of heat. On the other hand, when a porous body having pores having a pore diameter larger than 1.6 nm is used, when the relative humidity in the vicinity of the adsorbent is 0.30, the adsorbed body is difficult to be adsorbed, and a sufficient amount of adsorbent is not adsorbed. You cannot get the quantity. In order to obtain a more sufficient amount of adsorption, it is more preferable that the pore volume occupied by pores having a pore diameter of 0.6 nm to 1.6 nm is 0.35 cm ³ / g or more.

According to the third to sixth aspects of the present invention,
It is possible to obtain a porous material having a pore volume of 0.2 cm ³ / g or more occupied by pores having a pore diameter of 0.6 nm or more and 1.6 nm or less. In addition, the hydrolysis reaction and polycondensation reaction of the hydrolysis-polymerizable metal compound and the polymerization reaction of the carbon-carbon multiple bond-containing monomer are performed in the same reaction system, or the polymerization reaction is performed in a reaction system containing a hydrophilic polymer. By performing the hydrolysis reaction and the polycondensation reaction of the metal compound, the polymer can be uniformly dispersed in the three-dimensional fine network structure of the metal oxide gel without aggregation. Therefore, the pore diameter is surely 0.6 nm
The pore volume occupied by pores having a diameter of 1.6 nm or less is 0.2 c.
Porosity of at least m ³ / g can be obtained.

The above-mentioned monomer having a carbon-carbon multiple bond and the hydrophilic polymer include at least one functional group among amide group, urethane group, amino group, hydroxyl group, carboxyl group, sulfonic acid group and ester group. Is desirable.

According to a seventh aspect of the present invention, the water is desorbed by heating by a heating means, the adsorbent is regenerated, and the adsorbent is cooled by a heat exchange fluid cooled by a radiator. In a vehicle air conditioner that removes latent heat of evaporation from a heat exchange fluid flowing to an indoor heat exchanger by evaporating water in the above, the pore diameter of the adsorbent is 0.6 nm or more and 1.6 or less.
It is characterized by using a porous material having a pore volume of 0.2 cm ³ / g or more occupied by pores of nm or less. Thus, when the adsorption refrigeration system is applied to a vehicle air conditioner,
As a heating means for desorbing the adsorbent, usually about 80
A heat exchange fluid heated to １００100 ° C. is used. Therefore, when the adsorbent is desorbed, the relative humidity near the adsorbent is about 0.08. According to the seventh aspect of the present invention, among the pores of the adsorbent, pores having a pore volume of 0.2 cm ³ / g or more have a pore diameter of 0.6 nm or more. Water can be desorbed even with the heat quantity of a heat exchange fluid (approximately 80 to 100 ° C.) normally used when applied to an air conditioner for air conditioning. On the other hand, a heat exchange fluid (about 30 ° C.) cooled by a radiator is used as a heat absorbing source for adsorbing the adsorbent. Therefore, when the adsorbent is desorbed, the relative humidity near the adsorbent is about 0.30. According to the invention of claim 7, among the pores of the adsorbent,
Since the pore diameter of the pores having a pore volume of 0.2 cm ³ / g or more is 1.6 nm or less, it is possible to secure a sufficient amount of adsorption even when the relative humidity near the adsorbent is low. it can. Therefore, sufficient latent heat of evaporation can be taken from the heat exchange fluid, and sufficient cooling capacity for air-conditioning the vehicle interior can be obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a vehicle air conditioner using an adsorbent according to the present invention will be described with reference to the drawings. 1
Denotes an air conditioning unit for a vehicle, which is mounted below an instrument panel in a vehicle. The air-conditioning duct 2 of the air-conditioning unit 1 is an air-conditioning passage that guides conditioned air into the vehicle interior. At one end of the air-conditioning duct 2, suction ports 4 and 5 for sucking inside and outside air are provided. The intake ports 4 and 5 are switched and opened / closed by an inside / outside air switching door 6.

Reference numeral 3 denotes a blower, which blows air into the air conditioning duct 2 by driving a centrifugal fan 3b by a motor 3a. On the other hand, on the other end side of the air conditioning duct 2,
A plurality of blowing openings 7, 8, 9 communicating with the vehicle interior are formed, and are selectively opened and closed by opening switching doors 10, 11, 12, respectively.

An indoor heat exchanger 16 and a heater core 31 are provided downstream of the blower 3 in the air. The indoor heat exchanger 16 cools the air by absorbing the heat exchange fluid cooled by the evaporative condensers 60 and 70 of the adsorption refrigeration cycle 200 described later from the air in the air conditioning duct 2. The heater core 31 heats the air by radiating the engine cooling water to the air in the air conditioning duct 2. The amount of air passing through the heater core 31 and the amount of air bypassing the heater core 31 are adjusted by the air mix door 31a.

Next, the adsorption type refrigeration cycle 100 will be described in detail.

The adsorption type refrigeration cycle 100 includes first and second
Adsorption cores 20 and 30 and first and second evaporative condensers (evaporators and condensers) 60 and 70 are provided. The first adsorption core 20 and the first evaporative condenser 60 are accommodated inside a first closed vessel 601, and the second adsorption core 30 and the second evaporative condenser 70 are housed inside a second closed vessel 602. Inside the first and second closed containers 601 and 602, respectively,
A predetermined amount of water is enclosed.

The closed containers 601 and 602 contain first and second suction core chambers 6 for housing the first and second suction cores 20 and 30, respectively.
2, 63; first and second evaporative condensation chambers 66, 67 accommodating the first and second evaporative condensers 60, 70;
The first and second communication sections 86 and 87 communicate the second and second communication sections 63 and the evaporative condensation chambers 66 and 67. 1st, 2nd
The evaporative condensers 60 and 70 have a well-known heat exchanger shape,
It can evaporate and condense water. When one works as an evaporator to evaporate water, the other works as a condenser to condense water.

As shown in FIGS. 2A to 2C, the first,
The heat exchange units 201 and 301 of the second adsorption cores 20 and 30 are
A known heat exchange in which a plurality of flat tubes 22 through which a heat exchange fluid (for example, engine cooling water) flows and corrugated heat transfer fins 23 are alternately stacked between header tanks 21 provided at both ends. The gap formed by the tube 22 and the heat transfer fins 23 is filled with the adsorbent S of the present invention. The adsorbent S is bonded and fixed to the surfaces of the tube 22 and the heat transfer fins 23 with an adhesive (for example, epoxy resin).

FIG. 1 (b) shows the suction cores 20, 3
Of the heat exchange units 201 and 301 of 0, only the tube 22 is shown in a simplified manner.

The engine E, the heat exchange section 201 (or 301) of the first adsorption core 20 (or the second adsorption core 30),
The heater core 31 and the radiator 32 are connected in series by a pipe to form a first fluid circulation path a. The indoor heat exchanger 16 and the first evaporative condenser 60 (or the second evaporative condenser 70) are connected in series by a pipe to form a second fluid circulation path b.

An adsorbing core / evaporating condenser cooler (hereinafter, abbreviated as an adsorbing core cooler) 25, which is a radiator, will be described later.
Heat exchange section 201 of adsorption core 20 (or adsorption core 30)
(Or 301) are connected in series by piping, and the third
A fluid circulation path (cooling fluid circulation path) c is configured. Adsorption core cooler 2 of vapor pressure refrigeration cycle 200 described later
5. First evaporative condenser 60 (or second evaporative condenser 70)
Are connected in series by pipes to form a fourth fluid circulation path (cooling fluid circulation path) d. The third fluid circulation path c and the fourth fluid circulation path merge at a junction e and branch at a branch f. The adsorbing core cooler is provided in a merging channel g downstream of the merging portion e and upstream of the branching portion f.

An electric pump 33 is provided in the first fluid circulation path a.
An electric pump 34 is provided in the merging path g, and an electric pump 35 is provided in the second fluid circulation path b.
The flow of the heat exchange fluid in the direction of the middle arrow is generated.

The four-way valves 36 and 37 are provided in the middle of the fluid circulation paths a and c, and the four-way valves 36 and 37 allow the heat exchange fluid flowing into the first and second adsorption cores 20 and 30 to flow therethrough. Supply source is engine E or adsorption core cooler 25
To switch to. (In other words, the adsorption / desorption processes of the first and second adsorption cores 20 and 30 are switched by the four-way valves 36 and 37.) In the middle of the fluid circulation paths b and d, the four-way valve 38 is provided. , 39 are provided, and the first and second valves are provided by the four-way valves 38, 39.
The supply destination of the heat exchange fluid flowing out of the water condensing evaporators 60 and 70 is switched to the indoor heat exchanger 16 or the adsorption core cooler 25. (In other words, the four-way valve 38,
39 switches the evaporation and condensation of water by the first and second water condensation evaporators 60 and 70. The radiator 32 disposed outside the vehicle compartment is cooled by the outside air blown by the blower fan 43. When the temperature of the engine cooling water is lower than the predetermined temperature by the thermostat 42, the engine cooling water flows through the bypass circuit 41.

Subsequently, the vapor compression refrigeration cycle 200
Is a compressor 21 for compressing gas refrigerant, a condenser 22 for condensing high-pressure gas refrigerant by exchanging heat with the outside air blown by a blower fan 22a, a receiver 23 for gas-liquid separation, and an expansion for decompressing liquid refrigerant. Valve 24, suction core 2
0, 30 and an adsorption core cooler 25 for cooling the evaporative condensers 60, 70. These devices are connected by a water pipe to form a refrigerant circuit R. In addition,
Each device of the vapor compression refrigeration cycle 200 is installed outside the vehicle compartment (in the engine room).

In the adsorption core 25, a water passage is formed so as to come into contact with the low-temperature refrigerant (about 20 to 25 ° C.) depressurized by the expansion valve 24 and the water passing through the junction g. Therefore, in the suction core 25, the suction core 2
Heat of adsorption of water at 0, 30 and evaporative condensers 60, 7
The heat of condensation of water at 0 is absorbed by the low-temperature refrigerant downstream of the expansion valve 24.

The operation of the above configuration will be described below.

In the adsorption type refrigeration cycle 100, the first adsorption core 2 performs an adsorption step, the second adsorption core performs a desorption step, the first adsorption core 2 desorption step, and the second adsorption core adsorbs. The second step of performing the step is performed for a predetermined time (for example, 60 seconds).
Perform alternately every time. That is, the electric pumps 33 to 35 are operated to circulate the heat exchange fluid through the fluid circulation paths a to d, and the first stroke is performed by setting the four-way valves 36 to 39 to the solid line positions in FIG. .

In the first step, the engine cooling water (about 90 ° C.) of the engine E is circulated to the heat exchange section 301 of the second adsorption core 30 through the fluid circulation path a. The agent S is heated to desorb water. The water (gas) desorbed from the adsorbent S is supplied to the second evaporative condenser chamber 67.
Flows into. At this time, since the heat exchange fluid passing through the second evaporative condenser 70 is cooled by the adsorption core cooler 25, water (gas) is condensed in the second condenser chamber 67. By the desorption of water from the adsorbent S, the relative humidity near the adsorbent S becomes about 0.08. On the other hand, since the first adsorption core 20 is cooled by the adsorption core cooler 25, the adsorbent S of the first adsorption core 20 adsorbs water (gas). As a result, the pressure of the space formed by the adsorption core chamber 62, the communication portion 86, and the evaporative condensation chamber 66 decreases, and the water (liquid) in the evaporative condensation chamber 66 evaporates.
At this time, in the first evaporative condenser 60, the heat exchange fluid is deprived of latent heat of evaporation and cooled. The air flowing through the air conditioning duct 2 is cooled and dehumidified by causing the cooled heat exchange fluid to flow into the indoor heat exchanger 16 via the fluid circulation path b. As a result of the water being adsorbed by the adsorbent S, the relative humidity near the adsorbent S becomes about 0.30.

In the second stroke, the four-way valves 36 to 39 are connected as shown in FIG.
(B) This is performed by setting the position of the middle dotted line. Note that, in the second step, only the above-described adsorption and desorption, evaporation and condensation in the first step are interchanged, and therefore, the description of the second step is omitted.

Hereinafter, the adsorbent S which is a main part of the present invention will be described.

The adsorbent S has a pore diameter of 0.6 nm or more.
The pore volume occupied by pores of 6 nm or less is 0.2 cm ³ / g
The porous body described above is manufactured by the following manufacturing method.

N, N-dimethylacrylamide, 2,2'-azobis (isobutyronitrile) as a polymerization initiator
Was added to a methanol solution of, and 0.1 N hydrochloric acid as an acid catalyst was added thereto, followed by stirring at room temperature for about 3 hours to carry out a hydrolysis polymerization reaction. Subsequently, the homogeneous solution thus obtained is left at about 60 ° C. for 3 days,
The polymerization reaction of N, N-dimethylacrylamide was performed, and the solvent was volatilized to obtain a colorless and transparent gel-like solid. The thus obtained inorganic-organic composite was treated with 600
Calcination was performed at about 24 hours. With such a manufacturing method,
A porous body (average pore diameter 1.27 nm) having a pore volume of 0.36 cm ³ / g occupied by pores having a pore diameter of 0.6 nm or more and 1.6 nm or less was obtained. The average pore diameter and pore volume were measured by a nitrogen adsorption method.

The adsorbent S thus obtained and
As a comparative example, a water adsorption isotherm shown in FIG. 3 was obtained for the adsorbent S ′ obtained by reacting sodium silicate and sulfuric acid and then firing. The adsorbent S ′ is a porous body having a pore volume of 0.05 cm ³ / g occupied by pores having a pore diameter of 0.6 nm or more and 1.6 nm or less.

As described above, when the adsorption refrigeration system is applied to a vehicle air conditioner, the relative humidity near the adsorbent in the adsorption core where water is adsorbed is 0.08 to 0.30.
Becomes According to FIG. 3, the relative humidity is between 0.08 and 0.3.
When it changes to 0, the water absorption of the adsorbent S ′ becomes 0.05 cm ³
/ G, whereas the water absorption of the adsorbent S is 0.35 cm
³ / g. When the adsorbent S ′ is used as the adsorbent, the latent heat of vaporization sufficient to cool the air in the passenger compartment cannot be removed from the heat exchange fluid. Sufficient latent heat of vaporization to cool the air can be removed from the heat exchange fluid.

The relative humidity near the adsorbent is 0.08 to
In the range of 0.30, in order for the indoor heat exchanger 16 to remove sufficient latent heat of evaporation from the heat exchange fluid that exchanges heat with vehicle interior air, the pore diameter should be 0.6 nm or more and 1.6 nm.
It is desirable to use a porous body in which the pore volume occupied by the following pores is 0.2 cm ³ / g or more. As an adsorbent,
When a porous body having a pore diameter smaller than 0.6 nm is used, water is adsorbed by the adsorbent even when the relative humidity near the adsorbent is lower than 0.08, so the adsorbent is regenerated. May not be able to do so.

On the other hand, when a porous material having a pore diameter larger than 1.6 nm is used, the relative humidity near the adsorbent is 0.30
Of the adsorbent core 2 because
0 (or 30) and evaporative condenser 60 (or 70)
, That is, the suction core chamber 62 (or 6
3) A decrease in the pressure of the space formed by the communication portion 86 (or 87) and the evaporative condensation chamber 66 (or 67) is suppressed. Therefore, the amount of evaporation of water (liquid) by the evaporative condenser 60 (or 70) is reduced, so that the latent heat of evaporation taken from the heat exchange fluid is reduced and the cooling capacity is reduced. The pore volume occupied by pores having a pore diameter of 0.6 nm or more and 1.6 nm or less is 0.2 cm ³ / g or less, that is,
When the pore volume occupied by pores having a pore diameter smaller than 0.6 nm or pores having a pore diameter larger than 1.6 nm is large, the above-described problem occurs.

In the above-described embodiment, tetramethoxysilane is added to the carbon-carbon multiple bond-containing amide compound, a hydrolysis polymerization reaction is carried out, and then the solution is left for 3 days to evaporate. However, the volatilization time is desirably about 48 hours or more and 80 hours or less. When the volatilization time is 48 hours or less, it is difficult to sufficiently volatilize the solution, and the pore size distribution tends to be uneven. On the other hand, when the volatilization time is 80 hours or longer, association and aggregation of the amide bond-containing polymer easily occurs, and the pore diameter of the obtained porous body becomes large. Further, the heating temperature when the solution is volatilized is desirably 50 to 60 ° C.

Further, in the embodiment described above, the embodiment in which N, N-dimethylacrylamide is used as the monomer to be polymerized in the reaction system has been described. However, N-acryloylmorpholine is used as the monomer to be polymerized in the reaction system. , N, N-diethylacrylamide and N-isopropylacrylamide similarly have a pore size of 0.6
The pore volume occupied by pores having a size of not less than nm and not more than 1.6 nm is 0.
A porous body having a density of 2 cm ³ / g or more can be produced.

(Other Embodiments) In the above-described embodiment, a method of polymerizing a polymer in the same reaction system has been described as a method of manufacturing the porous body S. The porous body S may be produced by adding the polymerized hydrophilic polymer to the hydrolysis-polymerizable metal compound.

Tetramethoxysilane and 35% hydrochloric acid as an acid catalyst were added to a methanol solution of polyvinylpyrrolidone (weight average molecular weight: about 40,000), and the mixture was stirred at room temperature for 24 hours to carry out a hydrolysis polymerization reaction. The uniform solution thus obtained was left at 60 ° C. for about 3 days, and the solution was volatilized to obtain a colorless and transparent gel-like solid. The thus obtained inorganic-organic composite is baked at 450 ° C. for 24 hours, and the pore volume of pores having a pore diameter of 0.6 nm or more and 1.6 nm or less is 0.36 cm ³ / g. A porous material (average pore diameter 0.7 nm) was obtained. The average pore diameter and pore volume were measured by a nitrogen adsorption method.
Further, the porous body manufactured by the present manufacturing method is the first body.
It shows almost the same behavior as the porous body manufactured by the manufacturing method shown in the embodiment.

The polymer to be added to the hydrolysis-polymerizable metal compound may be a polyamide containing a carboxyl group in the molecule, a polyether containing a hydroxyl group in the molecule, or a polyether containing a carboxyl group in the molecule. .

Further, the metal oxide applicable in the present invention may be variously exemplified, and usually, a metal oxide composed of silica and / or alumina is preferably exemplified. In particular, a metal oxide which is a three-dimensional fine network structure and in which a specific hydrophilic polymer is uniformly dispersed in the network is desirable. In addition, the reaction reagents such as the polymerization initiator and the acid catalyst should be appropriately selected in accordance with the selection of the carbon-carbon multiple bond-containing monomer, the hydrophilic polymer, the metal oxide, and the like. It is not limited to the reagent used in the above.

In the embodiment described above, the heat exchange fluid for cooling the adsorption core in the adsorption process is cooled by the adsorption core cooler of the vapor compression refrigeration cycle. The present invention is also applicable to an embodiment in which cooling is performed by an air-cooled heat exchanger or the like provided in the above-described embodiment, and the form of the radiator is not particularly limited. In addition, although the mode in which the adsorbent is heated by the engine cooling water when water is desorbed from the adsorbent has been described, a heating means that directly heats the adsorbent by a heater or the like may be used.

[Brief description of the drawings]

FIG. 1A is a schematic overall configuration diagram of a vehicle air conditioner according to an embodiment, and FIG. 1B is a configuration diagram of an adsorption refrigeration cycle according to the embodiment.

FIG. 2A is a partially cutaway view of a closed container, and FIG.
FIG. 3 is a perspective view of the suction core, and FIG. 3C is a diagram illustrating a state in which an adsorbent is filled between a tube of the suction core and a heat transfer fin.

FIG. 3 is a diagram showing a water adsorption isotherm of the adsorbent S and the adsorbent S ′ showing a change in the amount of adsorption to the adsorbent with respect to a change in relative humidity near the adsorbent.

[Explanation of symbols]

100: adsorption refrigeration cycle, 20, 30: adsorption core,
60, 70: evaporating condenser, 16: heat exchanger inside the vehicle, S:
Adsorbent

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kin Kono 1-1-1, Showa-cho, Kariya-shi, Aichi Pref. (72) Inventor Hideaki Sato 1-1-1, Showa-cho, Kariya, Aichi Prefecture Inside DENSO CORPORATION (72) Inventor Yoshiki Nakajo 2, Kita-Shirakawa Nishi-Tatsuta-cho, Sakyo-ku, Kyoto

Claims (7)

[Claims] 1. An adsorbent for desorbing water by heating and adsorbing water by cooling, wherein the pore volume occupied by pores having a pore diameter of 0.6 nm or more and 1.6 nm or less is obtained. An adsorbent comprising a porous body having a density of 0.2 cm ³ / g or more. 2. An adsorbent which desorbs water by heating and adsorbs water by cooling, and has a pore volume occupied by pores having a pore diameter of 0.6 nm or more and 1.6 nm or less. An adsorbent comprising a porous material having a density of 0.35 cm ³ / g or more. 3. A hydrolysis reaction and a polycondensation reaction for gelling the hydrolysis-polymerizable metal compound and a polymerization reaction of a monomer having a carbon-carbon multiple bond are carried out in the same reaction system, and the hydrolysis reaction and the polycondensation reaction are carried out. Removing the polymer from the inorganic-organic composite in which the polymer generated by the polymerization reaction of the carbon-carbon multiple bond-containing monomer is uniformly dispersed in the three-dimensional fine network structure of the metal oxide gel generated by the method described above. The porous body according to claim 1, wherein the porous body is obtained. 4. In a reaction system containing a hydrophilic polymer, the hydrophilic polymer is contained in a three-dimensional fine network structure of a metal oxide gel obtained by subjecting a hydrolysis-polymerizable metal compound to a hydrolysis reaction and a polycondensation reaction. The porous body according to claim 1, wherein the porous body is obtained by removing the hydrophilic polymer from the inorganic-organic composite uniformly dispersed. 5. A hydrolyzable polymer metal compound is gelled by a hydrolysis reaction and a polycondensation reaction, and a polymerization reaction of a carbon-carbon multiple bond-containing monomer is carried out in the same reaction system as the hydrolysis reaction and the polycondensation reaction. From the inorganic-organic composite in which the polymer produced by polymerizing the carbon-carbon multiple bond-containing monomer in the three-dimensional fine network structure of the metal oxide gel produced by the hydrolysis reaction is uniformly dispersed. A method for producing an adsorbent for producing a porous body by removing the polymer. 6. In a reaction system containing a hydrophilic polymer, a hydrolyzable polymerized metal compound is gelated by a hydrolysis reaction and a polycondensation reaction, and the metal oxide gel produced by the hydrolysis reaction and the polycondensation reaction is formed. A method for producing an adsorbent for producing a porous body by removing the hydrophilic polymer from an inorganic-organic composite in which the hydrophilic polymer is uniformly dispersed in a three-dimensional fine network structure. 7. A radiator for cooling a heat exchange fluid, and an adsorbent for adsorbing water by being cooled by the heat exchange fluid cooled in the radiator, and desorbing water by being heated by a heating means. An adsorption core having an agent; an evaporating condenser for evaporating water when water is adsorbed by the adsorption core and condensing water when water is desorbed by the adsorption core; and adsorbing water on the adsorption core. A vehicular air conditioner having an indoor heat exchanger for exchanging heat between a cooled heat exchange fluid and vehicle interior air by depriving water of latent heat of vaporization in the evaporative condenser, wherein the adsorbent is used as the adsorbent. An air conditioner for a vehicle, wherein the adsorbent according to any one of 1 to 4 is used.