JPH0743184B2 - Cold water generator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an adsorption-type cold water generator for generating cold water for air conditioning, factory processes, and the like.

(Prior art) Among various cold water generators, an absorption type refrigeration cycle using lithium bromide as an absorbent is known as a conventional representative cold water generator capable of generating cold water by utilizing waste heat. There is one that was used, in this cold water generator,
For example, a part of the waste heat of the process and the waste heat of 80 ° C or more from the cogeneration system is used as a heat source for regeneration of the regenerator to generate cold water. Conventionally, when waste heat is left over in such a cold water generator, it is discarded without being collected into the atmosphere in a cooling tower, or it is collected in the form of hot water and stored in a hot water storage tank, etc. I use it. That is, in the chilled water generator using the absorption refrigeration cycle, cold water is generated by night power for the purpose of averaging the heat storage as cold heat performed in the chilled water generator driven by an electric motor, that is, day and night. Then, the heat is not stored as cold heat such as storing the heat in the heat storage device and using it at the time of demand for cold water. A heat storage device in such a cold water generator driven by an electric motor is a storage container in a liquid or solid state in which water or ice or a heat storage agent formed by mixing or coexisting with a chemical heat storage agent is used. It is generally stored inside and uses the sensible heat and latent heat to store heat.

(Problems to be solved by the invention) In the absorption refrigeration cycle, the temperature required in the regenerator is 80
Relatively high temperature above ℃, generally cannot maintain high coefficient of performance unless temperature around 85 ℃ is stable and obtained continuously, and when the temperature falls below 70 ℃, absorbent crystals precipitate. Or, the efficiency is extremely reduced and the function of generating cold water cannot be fully exerted. Therefore, in the absorption refrigeration cycle, waste heat of about 50 ° C cannot be used. In addition, when the heat generation amount of waste heat fluctuates or the generation time of waste heat and the demand time of cold water do not always coincide with each other and there is often a time lag, the above-mentioned required temperature can be obtained. However, it cannot always be effectively used for generating cold water.

The use of a heat storage device is also conceivable, but in the heat storage device described above used in a cold water generator driven by an electric motor, the structure of a storage container for the heat storage agent, the structure for preventing heat loss from the container, and the inside of the container In addition to the need to devise a configuration for extracting cold heat from the heat storage agent and maintenance and management of the heat storage agent, there are drawbacks such as the fact that a water-based heat storage device cannot be installed in some places.

The present invention aims to solve the above problems by utilizing an adsorption type refrigeration cycle.

(Means for Solving the Problems) In order to solve the above problems, in the present invention, a plurality of adsorbent filling sections that alternately operate as an adsorber and a regenerator are provided for a common refrigerant condenser and refrigerant evaporator. A pair of common refrigerant vapor paths are formed between the refrigerant condenser, the refrigerant evaporator and the adsorbent filling section, and the refrigerant condenser is provided on either side of the pair of common refrigerant vapor paths and the refrigerant evaporation is provided on the other side. The adsorbent filling section is connected to both of the pair of common refrigerant vapor paths through the on-off valves, and the heat exchange section provided in each adsorbent filling section is ,
It is connected to both the heat source water supply path and the cooling water supply path via an on-off valve, and at least one pair of a plurality of adsorbent filling sections is configured to operate as an element of a normal adsorption regenerator that operates during normal operation, and other We propose a chilled water generator in which the adsorbent filling section operates as a regenerator or an adsorber during auxiliary operation.

In the present invention, in the above-mentioned configuration, the adsorbent filling section other than the constituent elements of the regular adsorption regenerator has a larger adsorbent filling capacity than the adsorbent filling section of the constituent elements of the regular adsorption regenerator, and the adsorption regeneration is performed. It is proposed that the cycle time is longer than the cycle time of the adsorption regeneration of the adsorbent-filled portion of the components of the regular adsorption regenerator.

Further, in the present invention, in the above-mentioned configuration, the adsorbent filling section, which is a component of the regular adsorption regenerator, is configured to perform adsorption or regeneration with a cycle time of 1 to 10 minutes. It is proposed that the adsorbent filling section be configured to perform adsorption or regeneration for a cycle time of 10 minutes to 1 hour or longer, and that the adsorbent filling section utilize waste heat of 50 ° C. or higher for regeneration.

(Operation) Since the plurality of adsorbent filling sections are connected to both of the pair of common refrigerant vapor paths through the on-off valves, respectively, they can be connected to the common refrigerant vapor path on either side. . That is, the plurality of adsorbent filling sections can be selectively connected to both the refrigerant condenser and the refrigerant evaporator to perform the operation corresponding thereto.

Therefore, the paired adsorbent filling sections as constituent elements of the normal adsorption regenerator are made to correspond to the refrigerant condenser and the refrigerant evaporator via the common refrigerant vapor path, respectively, and the adsorbent filling sections of the respective adsorbent filling sections are made to correspond to this operation. The adsorption refrigeration cycle can be performed by supplying the heat exchange unit with hot water that has passed through the heat source water supply route or cooling water that has passed through the cooling water supply route, respectively. And
By alternately switching the operation of the on-off valve of the adsorbent filling section constituting the regular adsorption regenerator, it is possible to perform regular operation in which the generation of cold water is continued.

In the above normal operation state, with respect to the adsorbent filling section other than the components of the normal adsorption regenerator, if necessary, while opening the on-off valve on the side connected to the common refrigerant vapor path corresponding to the refrigerant condenser By supplying the hot water that has passed through the heat source water supply path to the heat exchange section, the adsorbent filling section can be operated as a regenerator.

Further, in the above normal operation state, the opening / closing valve on the side connected to the common refrigerant vapor path corresponding to the refrigerant evaporator is opened for the adsorbent filling section other than the constituent elements of the normal adsorption regenerator as necessary. At the same time, by supplying the cooling water through the cooling water supply path to the heat exchange section, the adsorbent filling section can be operated as an adsorber.

As described above, any of the adsorbent filling sections other than the constituent elements of the regular adsorption regenerator can be operated as an adsorber or a regenerator as required, and these operations are performed by the adsorbent constituting the regular adsorption regenerator. It can be performed even when the normal operation by the filling section is stopped.

From the above, in the present invention, by performing the normal operation of the adsorption cycle by operating the adsorbent filling section that constitutes the normal adsorption regenerator together with the common refrigerant condenser and refrigerant evaporator, 50 ° C from the heat source. Cold water can be generated by warm water of a certain level or more. And when the amount of heat generated by the heat source is larger than the amount of heat required to generate a predetermined amount of cold water,
When there is no demand for cold water, the adsorbent filling section, which is not a component of the regular adsorption regenerator, can be operated as a regenerator to substantially store heat as cold heat. Then, by maintaining the state after regeneration, and operating it as an adsorber when necessary, that is, when the amount of heat required to generate a predetermined amount of cold water is larger than the amount of heat generated by the heat source. It can be used to generate cold water, and the ability to generate cold water is increased.

From the above, the adsorbent filling part, which is not a component of the regular adsorption regenerator, has a larger adsorbent filling capacity than the adsorbent filling part constituting the regular adsorption regenerator, and the adsorption regeneration cycle time is By making the adsorption regenerator longer than the cycle time of adsorption regeneration, efficient use of heat is performed.

(Example) Next, the Example of this invention is described about figures.

In the figure, reference numeral 1 is a refrigerant condenser, 2 is a refrigerant evaporator, and these have a common configuration for a plurality of adsorbent filling sections 3a, 3b, 3c, 3d, .... And these adsorbent filling parts
At least a pair of 3a, 3b, 3c, 3d, ..., For example, an adsorbent filling section
3a and 3b are configured as constituent elements of a normal adsorption regenerator A that operates during normal operation, and other adsorbent filling sections 3c, 3d,
Are configured to operate as a regenerator or an adsorber during auxiliary operation. These adsorbent filling parts 3a, 3b, 3c, 3d ...
Is filled with a solid adsorbent such as silica gel or zeolite. Then, the adsorbent filling section 3 that is operated during the auxiliary operation
c, 3d ... are the adsorbent filling sections 3 that constitute the regular adsorption regenerator A
The filling capacity of the adsorbent is made larger than that of a and 3b so that the cycle time of adsorption regeneration thereof is longer than the cycle time of adsorption regeneration in the regular adsorption regenerator A. For example, the adsorbent filling sections 3a and 3b constituting the regular adsorption regenerator A are configured to perform adsorption and regeneration in a cycle time of 1 to 10 minutes, and the other adsorbent filling sections 3c, 3d ... Adsorption and regeneration are performed in a cycle time of 1 hour or more. In the illustrated embodiment, the common adsorption regenerator A is one set composed of a pair of adsorbent filling sections 3a and 3b, but a plurality of sets can also be constructed. In addition, other adsorbent filling parts 3c, 3d
A plurality of ... Are provided, but one may be provided.

Reference numerals 4u, 4v are common refrigerant vapor paths forming a pair, and the respective refrigerant vapor paths 4u, 4v are connected to the refrigerant condenser 1 and the refrigerant evaporator 2 via the on-off valves 5u, 5v; 6u, 6v, respectively. Connected. In addition, the adsorbent filling sections 3a, 3b that constitute the regular adsorption regenerator A
Is the refrigerant vapor path 4 via the on-off valves 7au, 7av; 7bu, 7bv, respectively.
While connecting to both u and 4v, other adsorbent filling parts 3c and 3d
... is the refrigerant vapor path 4u, 4v through the on-off valves 8cu, 8cv; 8du, 8dv
Connected to each of. Reference numeral 9 is a refrigerant tank, and the refrigerant condensed in the refrigerant condenser 1 is a siphon tube 10
Then, the refrigerant is introduced into the refrigerant tank 9 and stored therein, and then introduced from the refrigerant injection unit 13 into the refrigerant evaporator 2 via the refrigerant pump 11 and the flow rate adjusting valve 12. The above-mentioned refrigerant condenser 1, refrigerant evaporator 2 and adsorbent filling portions 3a, 3b, 3c, 3d ... Are provided with heat exchange portions 14, 15 and 16, respectively, and flow a corresponding heat medium as will be described later. It is configured.

That is, reference numeral 17 is a heat source water supply path connected to an appropriate heat source (not shown) such as a waste heat recovery device, and 18 is a cooling water supply path connected to a cooling water source (not shown) such as a cooling tower or a well. Heat exchange parts 16a, 16 provided in the agent filling parts 3a, 3b, 3c, 3d ...
b, 16c, 16d are the on-off valve pairs 1 provided on the upstream side and the downstream side, respectively.
9ae, 19af; 19be, 19bf; 19ce, 19cf; 19de, 19df are connected to both the heat source water supply path 17 and the cooling water supply path 18, and the cooling water supply path 18 is the refrigerant condenser. The path leading to the heat exchange section 14 of No. 1 is connected. On the other hand, reference numeral 20 is a cold water supply path connected to a cold water use place (not shown) such as a heat exchanger for cooling, and the path to the heat exchange section 15 of the refrigerant evaporator 2 is connected to the cold water supply path 20. There is. In the figure, reference numeral 21 is a heat insulating member and 22 is a refrigerant liquid.

The operation of the above configuration will be described below.

(I) Normal Operation First, as shown in FIG. 1, the normal adsorption regenerator A is operated by opening the hatched open / close valve and open / close valve pair and closing the unopened open / close valve and open / close valve pair. Perform regular operation. The on-off valve and the on-off valve pair related to the other adsorbent filling section 3c are closed for convenience now regardless of the hatched state.

In the above operation, the adsorbent in the adsorbent filling section 3a is heated from the heat source water supply path 17 via the on-off valve pair 19ae to the heat exchange section 16a.
It is heated by the heat source water that flows to discharge refrigerant vapor.
That is, the adsorbent filling section 3a operates as a regenerator. The refrigerant vapor discharged from the refrigerant reaches the refrigerant vapor path 4u via the opening / closing valve 7au, flows through the refrigerant vapor path 4u, and flows into the refrigerant condenser 1 via the opening / closing valve 5u. The refrigerant vapor thus flowing into the refrigerant condenser 1 exchanges heat with the cooling water in the cooling water passage 18 flowing through the heat exchange section 14 to be cooled and condensed, and then introduced into the refrigerant tank 9 through the siphon pipe 10. And is collected at the bottom. The refrigerant liquid 22 accumulated in the lower portion of the refrigerant tank 9 is
Through the circulation pump 11 and the flow rate adjusting valve 12, the refrigerant is ejected from the refrigerant ejection portion 13 into the refrigerant evaporator 2 to be evaporated, and at this time, heat is taken from the cold water in the cold water supply path 20 flowing through the heat exchange portion 15, To cool. Then, the refrigerant vapor in the refrigerant evaporator 2 is opened and closed by an on-off valve.
From 6v, it flows into the adsorbent filling section 3b through the refrigerant vapor path 4v and the on-off valve 7bv, where it is adsorbed by the adsorbent. That is,
The adsorbent filling section 3b operates as an adsorber, and the heat of adsorption generated during such adsorption is removed by the cooling water flowing from the cooling water supply path 18 to the heat exchange section 16b via the on-off valve pair 19bf.

In the above normal operation, when the adsorption capacity of the adsorbent filling section 3b drops below a predetermined level, the on-off valve and the on-off valve pair for the adsorbent filling sections 3a, 3b constituting the normal adsorption regenerator A are reversed from the above. Open and closed. That is, these on-off valves and on-off valve pairs are switched so that those hatched in FIG. 1 are closed and those not hatched are open.
In addition, the open / close state of the open / close valves 5 and 6 on the refrigerant condenser 1 side and the refrigerant evaporator 2 side remains the same, that is, those open / close valves 5 and 6 are open and those not open. Is closed.

In this state, contrary to the above, the adsorbent filling section 3b operates as a regenerator, and the refrigerant vapor released from this reaches the refrigerant vapor path 4u through the on-off valve 7bu, and the refrigerant vapor path 4u is the same as that described above. And flows into the refrigerant condenser 1 through the on-off valve 5u. Further, the adsorbent filling section 3a operates as an adsorber, and is the opening / closing valve from the refrigerant evaporator 2 as described above. In addition, the open / close state of the open / close valves 5 and 6 on the refrigerant condenser 1 side and the refrigerant evaporator 2 side remains the same, that is, those open / close valves 5 and 6 are open and those not open. Is closed.

In this state, contrary to the above, the adsorbent filling section 3b operates as a regenerator, and the refrigerant vapor released from this reaches the refrigerant vapor path 4u through the on-off valve 7bu, and the refrigerant vapor path 4u is the same as that described above. And flows into the refrigerant condenser 1 through the on-off valve 5u. Further, the adsorbent filling section 3a operates as an adsorber, and the refrigerant vapor that has reached the refrigerant vapor path 4v from the refrigerant evaporator 2 via the on-off valve 6v is sucked into the adsorbent filling section 3a from the on-off valve 7av in the same manner as described above. And is adsorbed here.

The on-off valves 5u, 5v; 6u, 6v switch the correspondence between the refrigerant vapor paths 4u, 4v and the refrigerant condenser 1 and the refrigerant evaporator 2, and as described above, all the adsorbent filling parts 3a, 3b, 3
It may be omitted in the configuration in which a pair of on-off valves 7 and 8 that selectively communicate with the refrigerant vapor paths 4u and 4v are provided on the c, 3d ... Sides.

As described above, with respect to the common refrigerant condenser 1 and refrigerant evaporator 2, a pair of adsorbent filling sections that constitute the normal adsorption regenerator A
Alternately operate each of 3a and 3b as a regenerator and an adsorber,
By performing the adsorption refrigeration cycle, it is possible to continuously generate cold water as in the conventional adsorption refrigerator. The adsorption refrigeration cycle does not have the disadvantage of the precipitation of the absorbent in the absorption refrigeration cycle, the temperature required for regeneration of the adsorbent in the regenerator is relatively low, and the amount of heat generated from the heat source is The fluctuation of the capacity with respect to fluctuations is small, and therefore, if the temperature is about 50 ° C. or higher, waste heat that could not be used conventionally can be used for generating cold water.

(II) Normal and auxiliary (heat storage) combined operation In the above normal operation, when the amount of heat generated by the heat source is larger than the amount of heat required to generate cold water, such as when the cold water load is small, As shown in, for example, the on-off valve and the on-off valve pair related to the adsorbent filling portion 3c, open the on-off valve and the on-off valve pair hatched in the figure, and close the on-off valve and the on-off valve pair not subjected to this, Auxiliary operation is performed in combination with normal operation.

Thus, the adsorbent in the adsorbent filling section 3c is heated by the heat source water flowing from the heat source water supply path 17 to the heat exchanging section 16c through the on-off valve pair 19ce to release the refrigerant vapor, and is released from here. The refrigerant vapor passes through the on-off valve 8cu and the refrigerant vapor path 4
At u, along with the refrigerant vapor discharged from any of the adsorbent filling sections 3a, 3b of the regular adsorption regenerator A operating as a regenerator, the refrigerant flows through the refrigerant vapor path 4u, and passes through the on-off valve 5u to reach the refrigerant. It flows into the condenser 1. In this way, this adsorbent filling section 3c is regenerated, and when it is completed, the on-off valve
8cu and the on-off valve pair 19ce are closed, and then the other adsorbent filling sections 3d ... Are regenerated in the same manner as above.

As described above, when the generated amount of heat of the heat source is larger than the amount of heat required to generate cold water, such as when the load of cold water is small, it operates as a regenerator in the regular adsorption regenerator A. Since the regeneration of the adsorbent-filled portions 3a, 3b is completed in a short time, the amount of heat generated is left as it is, but as described above, in the present invention, in such a state, an excessive amount of heat is generated. Is another adsorbent filling part 3c, 3d
Since it is used for reproduction of ..., its effective use can be achieved. In this way, the adsorbent filling section 3 that substantially stores excess heat
By setting the adsorbent filling amount in c, 3d ... to be larger than that in the adsorbent filling portions 3a, 3b constituting the regular adsorption regenerator A, a larger amount of heat can be stored, and such a constitution is provided. Then, the cycle time of the adsorption regeneration of the former becomes longer than that of the latter. In this way, the heat storage amount is determined by the adsorbent filling parts 3c, 3
It is possible to easily increase by providing a plurality of d ... and increasing the amount of adsorbent filled therein.

(III) Auxiliary (heat storage) operation Next, at the time when there is no demand for cold water even though heat that can be used by the heat source is generated, the adsorbent filling section 3a, which constitutes the regular adsorption regenerator A, When the regeneration of 3b is completed, the on-off valve and the on-off valve pair are closed, and the on-off valve and the on-off valve pair of the other adsorbent filling sections 3c, 3d ... Are the same as the operation of (II) described above. The adsorbent-filled parts 3c, 3d ... can be regenerated by performing the auxiliary operation by controlling the operation of the adsorbent, and after the regeneration, these on-off valves and on-off valve pairs are closed to operate as the next adsorber. Wait until. In this way, the heat generated by the heat source when there is no demand for cold water
By storing heat in the form of regenerating the adsorbent-filled portions 3c, 3d ..., It can be effectively used for generating cold water.

(IV) Normal and Auxiliary (Cold Water Generation) Operation Next, in the above-mentioned normal operation shown in FIG. 1, the cold water load is large and the amount of heat required to generate cold water is greater than the amount of heat generated by the heat source. When there are many, the adsorbent filling sections 3c, 3d, etc., which are operated during the auxiliary operation, are used together with the normal operation described above by opening the hatched on-off valves and on-off valve pairs as shown in FIG. And perform auxiliary driving.

Then, it is evaporated in the refrigerant evaporator 2 and the refrigerant vapor path
A part of the refrigerant vapor flowing through 4v reaches the adsorbent filling section 3b which constitutes the regular adsorption regenerator A via the on-off valve 7bv, and is adsorbed by the adsorbent there, and the rest from the vapor path 4v through the on-off valve 8c.
It reaches the adsorbent filling section 3c via v, where it is adsorbed by the adsorbent regenerated by the previous operation. That is, in this state, the adsorbent filling section 3c operates as an adsorber. Then, in such an operation, when the adsorption capacity of the adsorbent filling section 3c drops below a predetermined level, the adsorbent filling section 3c
After closing the on-off valve and on-off valve pair of the
Similarly, 3d operates as an adsorber to continue the auxiliary operation. By the above-mentioned auxiliary operation, the adsorbed amount of the refrigerant vapor, that is, the evaporated amount of the refrigerant in the refrigerant evaporator 2 can be increased, so that the cold water generation capacity is increased, and thus the increased cold water demand can be dealt with. .

(Effects of the invention) As described above, the cold water generator of the present invention generates cold water by utilizing the adsorption type refrigeration cycle, so that there is no inconvenience such as precipitation of the absorbent in the absorption type refrigeration cycle.
If the temperature is about ℃ or more, it is effective in that even waste heat whose amount of generated heat fluctuates can be effectively used for generating cold water. Further, the cold water generator of the present invention, in addition to at least a pair of adsorbent filling parts constituting a regular adsorption regenerator, is provided with an appropriate number of adsorbent filling parts to be operated during auxiliary operation, and these adsorbent filling parts Since the heat is stored as cold heat in the form of regeneration, excess heat may be generated due to the small load of cold water at the time of demand for cold water, or there may be a time lag between the time of heat generation and the time of demand for cold water. Even if there is, there is an effect that these heat amounts are not wasted and can be effectively used for generation of cold water at the time of occurrence of a large cold water load that cannot be dealt with by the normal adsorption regenerator alone. Thus, the present invention widely uses the waste heat of a relatively low temperature in the waste heat of the process and the waste heat of the cogeneration system, which have not been effectively used in the past, for supplying cold water for air conditioning and industrial processes. The effect is that you can.
The components of the adsorption refrigeration cycle are vibration-free, noise-free, and the adsorbents such as silica gel and zeolite are also non-toxic, odorless, pollution-free, and non-corrosive, so even in the event of a disaster, etc. There is an effect that it is safe without causing pollution, and that maintenance and management are very easy to perform.

[Brief description of drawings]

FIG. 1 is a system explanatory diagram showing the overall configuration and operation of the present invention, and FIG. 2 is a system explanatory diagram of a main part showing another operation of the present invention. Reference A ... Regular adsorption regenerator, 1 ... Refrigerant condenser, 2 ...
Refrigerant evaporator, 3 ... Adsorbent filling section, 4 ... Common refrigerant vapor path, 5,6,7,8 ... Open / close valve, 9 ... Refrigerant tank, 10 ...
Siphon pipe, 11 …… Refrigerant circulation pump, 12 …… Refrigerant flow rate control valve, 13 …… Refrigerant ejection part, 14, 15, 16 …… Heat exchange part, 17
...... Heat source water supply path, 18 …… Cooling water supply path, 19 …… Open / close valve pair, 20 …… Cold water supply path, 21 …… Insulation material, 22 …… Refrigerant liquid.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inoue Nobumi Ino 1-5-15-204 Shimizuguchi, Usui-cho, Inba-gun, Chiba Prefecture (72) Hideji Yanagi 3600-80, Nakane, Katsuta-shi, Ibaraki (56) References Special Kai 62-175563 (JP, A) JP 64-58966 (JP, A) Patent 115887 (JP, C2)

Claims (5)

[Claims] 1. A common refrigerant condenser and refrigerant evaporator,
A plurality of adsorbent filling sections that alternately operate as an adsorber and a regenerator are provided, and a pair of common refrigerant vapor paths are formed between the refrigerant condenser, the refrigerant evaporator and the adsorbent filling section. Refrigerant condenser on either side of the path,
A refrigerant evaporator is connected to the other side, and each of the adsorbent filling sections is connected to both of a pair of common refrigerant vapor paths via an on-off valve and is provided in each adsorbent filling section. The heat exchange section is connected to both the heat source water supply path and the cooling water supply path via an on-off valve, and at least one pair of the plurality of adsorbent filling sections is operated as an element of a normal adsorption regenerator that operates during normal operation. A chilled water generator characterized in that the other adsorbent filling section is configured to operate as a regenerator or an adsorber during auxiliary operation. 2. The adsorbent filling section other than the constituent elements of the normal adsorption regenerator has a larger adsorbent filling capacity than the adsorbent filling section of the constituent elements of the normal adsorption regenerator to increase the cycle time of adsorption regeneration. The chilled water generator according to claim 1, wherein the chilled water generator is configured to have a cycle time longer than the adsorption regeneration time of the adsorbent-filled portion of the constituent elements of the regular adsorption regenerator. 3. The chilled water generator according to claim 2, wherein the adsorbent filling section, which is a component of the conventional adsorption regenerator, is configured to adsorb or regenerate in a cycle time of 1 to 10 minutes. 4. The chilled water generator according to claim 2, wherein the adsorbent filling section other than the constituent elements of the regular adsorption regenerator is configured to adsorb or regenerate at a cycle time of 10 minutes to 1 hour or longer. 5. The chilled water generator according to claim 1, wherein the adsorbent filling section regenerates by utilizing waste heat of 50 ° C. or higher.