JP2503752B2 - Adsorption refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cooling fluid or a heating fluid in a closed container filled with a working medium that changes in phase between a gas phase and a liquid phase. A heat exchanger with an adsorbent, which is supplied and which adsorbs the working medium when receiving the cooling fluid, and releases the working medium when receiving the heating fluid, and a working medium by the heat exchanger with the adsorbent. A heat exchanger for a working medium that exchanges heat with the working medium in association with adsorption and release and thereby causes an evaporation or condensation action in the working medium, and is generated when the working medium evaporates. The present invention relates to an adsorption refrigeration system configured to utilize cold heat as a heat source for cooling.

(Prior Art) FIG. 3 shows a basic system diagram of a conventional general adsorption type refrigeration system. The basic cycle of the adsorption refrigerating apparatus will be described with reference to FIG. 3. In FIG. 3, reference numeral 1 is a closed container, and the closed container 1 has a phase change between a gas phase and a liquid phase. It is filled with a working medium W such as water.

Further, two types of heat exchangers 2 and 3 are incorporated in the closed container 1. One of the heat exchangers 2 is a heat exchanger with an adsorbent provided with an adsorbent 12 such as zeolite or silica gel that adsorbs or releases the gaseous working medium Wg according to the temperature of the supplied fluid, The other heat exchanger 3 exchanges heat with the working medium W, receives cold heat from the working medium W when the malfunctioning medium W is evaporated, and cools the working medium W when the working medium W is condensed. It is a heat exchanger for working medium.

In the heat exchanger 2 with adsorbent, the heat exchanger 2 with adsorbent is driven by the pump 41 in accordance with the switching of the valves 42 and 43.
The cooling fluid F ₅ for producing the adsorbing action of the working medium W on the adsorbent 12 or the heating fluid F ₄ for producing the releasing action of the working medium W on the adsorbent 12 is supplied to In the medium heat exchanger 3, in response to the switching of the valves 62 and 63, the pump 61 evaporates the liquid working medium Wl when the working medium is adsorbed by the adsorbent, and receives cold heat from the working medium W during the evaporation. Cooling fluid F ₆ acting or adsorbent 12
A condensing fluid F ₇ is supplied, which has a function of cooling the gaseous working medium Wg released from and condensing the working medium Wg.

In FIG. 3, reference numeral 4 denotes a heating fluid supply source (for example, high temperature heating oil, boiler waste water, solar water heater, etc.) for supplying the heating fluid F ₄ to the heat exchanger with adsorbent 2. Reference numeral 5 indicates a cooling fluid supply source (for example, groundwater or a cooling tower) for supplying the cooling fluid F ₅ to the heat exchanger 2 with an adsorbent, and reference numeral 6 indicates that the cooled fluid F ₆ is higher than the working medium W. A device for utilizing cold heat (for example, an indoor heat exchanger for air conditioning) for performing cooling or the like by using the received cold heat, and 7 is a gaseous working medium Wg released from the adsorbent 12 of the heat exchanger 2 with adsorbent. Fluid for condensing F ₇
2 shows a condensing fluid supply source (for example, an outdoor air conditioner for air conditioning) for supplying the air.

The adsorption type refrigerating device configured as described above operates as follows.

That is, the cooling fluid F ₅ for the heat exchanger 2 with the adsorbent
When the adsorbent 12 of the heat exchanger 2 with an adsorbent is in the adsorption process for adsorbing the gaseous working medium Wg by the supply of the liquid, the liquid working medium Wl is continuously evaporated due to the adsorption of the working medium. Then, the temperature of the working medium Wl is lowered, and thereby the fluid (fluid to be cooled) F ₆ supplied to the working medium heat exchanger 3 is cooled. The cooled fluid F ₆ to be cooled is used as a cold heat source such as cooling.

Next, when the adsorption process of the working medium W in the adsorbent 12 of the heat exchanger 2 with an adsorbent is continued for a certain period of time, the adsorption process is ended, and then the valves 42 and 43 are switched so that the adsorbent is adsorbed. The heating fluid F ₄ is supplied to the heat exchanger 2 instead of the cooling fluid F ₅ used up to that point. When the adsorbent 12 of the heat exchanger 2 with an adsorbent is thereby heated, the working medium W adsorbed in the adsorbent 12 is released and the adsorbent 12 shifts to the regeneration process. In order to condense the gaseous working medium Wg released from the adsorbent 12 in this regeneration process, by switching the valves 62 and 63 for the working medium heat exchanger 3,
The condensing fluid F ₇ is supplied in place of the cooled fluid F _{6 up} to that point (for example, from the outdoor heat exchanger 7 for air conditioning).
Thereby, the condensation of the gaseous working medium Wg is promoted, and accordingly, the working medium is released from the adsorbent 12 of the heat exchanger with adsorbent 2 (regeneration of the adsorbent 12) continuously. When the regeneration process of the adsorbent 12 has passed a predetermined time, the adsorption process is switched to the adsorption process again, and thereafter, the adsorption process and the regeneration process are alternately repeated.

It is conventionally known to apply such an adsorbing type refrigerating apparatus to an air conditioner to cool and heat a room (see, for example, JP-A-63-46356).

(Problems to be Solved by the Invention) By the way, when the adsorption type refrigerating apparatus is applied as an air conditioner in this manner, there is a possibility that the following problems occur due to its configuration.

That is, since the adsorption type refrigerating device evaporates or condenses the working medium housed in the closed container and exchanges heat with the heat source outside the closed container during that time,
A predetermined amount of working medium is filled in the closed container, and water having large latent heat is generally used as the working medium.

However, when the adsorption type refrigeration system using water as the working medium is applied to the air conditioner as described above, during the heating operation (that is, in the adsorption type refrigeration system shown in FIG. Is in the regeneration process and the working medium heat exchanger 3 is evaporating), for example, when the outside air temperature is 0
When the temperature falls below 0 ° C., the temperature of the refrigerant in the working heat exchanger 3 falls below 0 ° C., and water as a working medium freezes on the surface of the working medium heat exchanger 3 to cause its heat transfer effect. Hindered,
This causes a decrease in heating capacity.

Therefore, the present invention has been made as an attempt to provide an adsorption type refrigeration system capable of improving the heating operation capacity by preventing freezing of the working medium in the working medium heat exchanger under low outside air temperature conditions. Is.

(Means for Achieving the Object) The adsorption refrigerating apparatus of the present invention adopts the following configuration in order to achieve the above object.

In the invention described in claim 1, as illustrated in the embodiment of FIG. 1, for cooling, the closed containers 1A, 1B filled with the working medium W that changes in phase between the gas phase and the liquid phase are cooled. A heat exchanger 2A, 2B with an adsorbent, which receives the supply of the fluid or the heating fluid and adsorbs the working medium W when receiving the cooling fluid, and releases the working medium W when receiving the heating fluid,
As the working medium W is adsorbed and released by the heat exchangers 2A and 2B with adsorbent, heat is exchanged between the working medium W and the working medium W, thereby causing the working medium W to vaporize or condense. The working medium heat exchangers 3A and 3B, and the working medium heat exchangers due to the latent heat of vaporization of the working medium W when the working medium (W) is adsorbed by the adsorbent-equipped heat exchangers 2A and 2B.
While cooling the fluid supplied to 3A, 3B, when the working medium W is released by the heat exchangers 2A, 2B with adsorbent, the heat of condensation generated from the working medium W is transferred to the working medium heat exchangers 3A, 3B.
In an adsorption type refrigeration system in which a plurality of adsorption type refrigeration units Ua, Ub arranged to be removed by a fluid supplied to the working medium W are arranged in parallel, an additive having a property of lowering the freezing point of the working medium W is added to the working medium W. While mixing, the concentration adjusting means 31, 32, for changing and adjusting the concentration of the additive according to the outside air temperature,
It is characterized by having 33, 34. According to a second aspect of the invention, in the adsorption refrigeration system according to the first aspect, one of the adsorption refrigeration units Ua, Ub on the side of the adsorption refrigeration unit Ua or Ub on which the adsorption process is completed is completed. A concentrated solution tank 25A that collects and stores the liquid medium Wal of the working medium heat exchanger 3A or 3B, and the other adsorption type refrigeration unit Ub or Ua side working medium heat exchanger 3B or 3A that has completed the regeneration process. The thin solution tank 25B for collecting and storing the liquid medium Wbl, and the concentrated solution Wc in the concentrated solution tank 25A or the thin solution Wd in the diluted solution tank 25B is the heat exchanger for each working medium according to the ambient temperature. It is characterized by being provided with a supply means 27 for supplying to 3A and 3B.

(Operation) In the present invention, the following operation is obtained by adopting such a configuration.

Actions common to each invention according to claims 1 and 2 (1) The adsorption type refrigerating apparatus used in each invention is a plurality of adsorption type refrigerating units Ua, Ub which alternately repeat the adsorption process and the regeneration process. It is configured.

Then, an adsorption type refrigeration unit (Ua or
In Ub), the working medium W adsorbed by the adsorbent (12A or 12B) of the heat exchanger with adsorbent (2A or 2B) is evaporated and the temperature thereof is lowered. The cold heat of the working medium W is used, for example, in the indoor heat exchanger 6B of the air conditioner as a cooling heat source (during cooling operation) or removed in the outdoor heat exchanger 6A (during heating operation).

In this case, when the outside air temperature is low during heating,
From the outdoor heat exchanger 6A side, the working medium heat exchanger (3A or
3B) the temperature of the fluid supplied to the working medium W decreases, and in particular, when it falls below the freezing temperature of the working medium W, the working medium W freezes on the surface of the working medium heat exchanger (3A or 3B). However, in the present invention, since an additive having a property of lowering the freezing point of the working medium W is mixed in the present invention, the working medium W as described above is There is no fear of freezing.

(2) On the other hand, in the adsorption type refrigeration unit (Ub or Ua) that performs the regeneration process, the adsorbent (12B or 2A)
The working medium W released from B or 12A) is condensed and gradually accumulated. The condensation heat generated at this time is used as a heating heat source in the indoor heat exchanger 6B (during heating operation) or is removed in the outdoor heat exchanger 6A.

(3) When the predetermined cycle time is reached next, the adsorption type refrigeration unit (Ua or Ub) that has performed the adsorption process until then.
Is switched to the regeneration step, and the adsorption type refrigeration unit (Ub or Ua) that has been performing the regeneration step is switched to the adsorption step, whereby continuous operation of the refrigeration system is realized.

(4) The concentration of the additive mixed in the working medium W is changed by the concentration adjusting means 31, 32, 33, 34 according to the outside air temperature (in other words, depending on the possibility of freezing of the working medium W). The heat transfer inhibition due to the freezing of the working medium W is prevented more effectively.

Action specific to the invention described in claim 2 (5) In the invention described in claim 2, the following unique action is obtained in addition to the basic actions of the above (1) to (4).
That is, the working medium heat exchanger (3A or 3B) on the side of the adsorption type refrigeration unit (Ua or Ub) where the adsorption process has been completed.
The liquid medium Wal with a high additive concentration of is in the concentrated solution tank 25A, and the additive concentration of the heat exchanger (3B or 3A) for the working medium on the side of the other adsorption type refrigeration unit (Ub or Ua) that has completed the regeneration process. The low liquid medium Wbl is collected and stored in the thin solution tank 25B. The high-concentration liquid medium Wal of the concentrated solution tank 25A and the low-concentration liquid medium Wbl of the thin solution tank 25B are supplied to the working medium heat exchanger (3A or 3A or at a predetermined ratio according to the outside air temperature). 3B).

(Advantages of the Invention) According to the adsorption refrigeration apparatus of the invention of claim 1, the working medium W of each adsorption refrigeration unit (Ua, Ub) is mixed with an additive having a property of lowering the solidification temperature thereof. Since the coagulation temperature of the adsorption medium refrigeration unit (Ua or Ub) acts as an evaporator of the air conditioner, the outside air temperature is reduced. When the working medium heat exchanger (3A or 3B) does not freeze on the surface of the working medium heat exchanger (3A or 3B) and hinders the heat transfer, even if the temperature is low, the adsorption refrigeration system is used as an air conditioner. It is possible to obtain the effect of improving the heating / cooling capacity in.

Further, since the concentration of the additive mixed with the working medium W can be changed and set according to the outside air temperature, the influence of the mixing of the working medium W on the phase change characteristics of the working medium W is possible. In the state of being suppressed to the above value, there is also an effect that the freezing of the working medium W on the surface of the working medium heat exchanger (3A, 3B) can be prevented more accurately, and the heat exchange performance thereof can be improved.

According to the adsorption type refrigeration system of the second aspect of the present invention, in addition to the effects described above, the following unique effects can be obtained. That is, when the regeneration process or adsorption process of each adsorption refrigeration unit (Ua, Ub) is completed, the working medium W having a low additive concentration is added to the thin solution Wd from the adsorption refrigeration unit (Ua or Ub) on the regeneration process completion side. As a concentrated solution Wc as a concentrated solution Wc from the adsorption type refrigeration unit (Ub or Ua) on the adsorption process completion side as a concentrated solution Wc. Accordingly, the adsorbing refrigeration unit (Ua, Ub) is re-supplied to the adsorption refrigeration unit (Ua, Ub) side at a predetermined mixing ratio. It can be adjusted.

(Embodiment) An adsorption type refrigerating apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

In this embodiment, the adsorption type refrigerating apparatus is applied to an air conditioning apparatus for indoor air conditioning, and as shown in FIG. 1, two adsorption type refrigerating units Ua, Ub of first and second groups are used. Side by side. And each of these adsorption type refrigeration units (U
a, Ub) is equipped with a heat exchanger with adsorbent (2A, AB) and a heat exchanger for working medium (3A, 3B), which will be described later, in a closed container (1A, 1B), and further, the closed container (1A, 1B). , 1B) is filled with a working medium (Wa, Wb) that undergoes a phase change between a gas phase and a liquid phase, in other words, repeating evaporation and condensation. In this embodiment, water having a large latent heat is used as the working medium.

In addition, each of these adsorption refrigeration units (Ua, Ub)
The system is the same as that of the basic system described above with reference to FIG. 3, but this embodiment has a structure in which a mechanism for adjusting the concentration of the working medium described later is additionally provided. ing. Therefore, of the configurations and operations of these adsorption type refrigeration units, the description of the same basic system is used for the portions overlapping with those of the same basic system, and in the following description, the system unique to the same embodiment will be described. The explanation will focus on the part.

The heat exchanger with adsorbent (2A, 2B) in each adsorption type refrigeration unit (Ua, Ub) has an adsorbent (12A, 12B) such as zeolite or silica gel attached to the heat exchanger body (11A, 11B). but, the heat exchanger body (11A, 11B) working medium by feeding the cooling fluid F ₅ from the cooler 5 to (Wag, WBG) adsorbing (suction stroke), the heat exchanger body contrast (11A, 11
And performs (regeneration step) acts to release the working medium (Wag, WBG) by supplying heating fluid F ₄ from the heater 4 to B).

For each heat exchanger body (11A, 11B) in the heat exchanger with adsorbent in each adsorption type refrigeration unit, the heater 42 and the cooler 5 are provided with a valve 42, which is a four-way switching valve. It is designed to be selectively connected by switching 43.

On the other hand, the working medium heat exchangers (3A, 3B) in the respective adsorption type refrigeration units (Ua, Ub) are connected to the outdoor heat exchanger 6 and the indoor heat exchanger via valves 62, 63 constituted by four-way switching valves. It can be selectively connected to the container 7.

Next, the operation of the basic system portion of the adsorption type refrigerating apparatus of this embodiment will be described by taking the case of performing the cooling operation as an example. Adsorption type refrigeration unit of which the temperature of W is lower (the second adsorption type refrigeration unit in this embodiment)
Ub) the heat exchanger main body 11B of the heat exchanger with adsorbent 2B is the heater 4, and the heat exchanger 3B for working medium is the outdoor heat exchanger 6.
The heat exchanger with adsorbent 2B of the adsorption type refrigeration unit Ub connected to each of the adsorbing type refrigerating units Ub is in the state of starting the adsorption process. The other adsorption type refrigeration unit (the one with the higher temperature of the working medium W) (the first adsorption type refrigeration unit Ua in this embodiment)
The heat exchanger main body 11A of the heat exchanger with adsorbent 2A is connected to the cooler 5 and the heat exchanger for working medium 3A is connected to the indoor heat exchanger 7 so that the heat with adsorbent of the adsorption refrigeration unit Ua Exchanger 2A
Is in the start state of the reproduction process.

When operation is performed in this state and the preset cycle time is reached, each adsorption refrigeration unit U
At a and Ub, the respective strokes are completed, the adsorption stroke and the regeneration stroke are switched again between both adsorption type refrigeration units Ua and Ub, and by repeating this process, continuous operation of the adsorption type refrigeration system is realized. To be done. At this time, in the second adsorption type refrigeration unit Ub after the adsorption process, the liquid working medium Wb
The liquid level of l is high, and the liquid level of the liquid working medium Wal is low in the first adsorption type refrigeration unit Ua at the end of the regeneration process.

On the other hand, in the outdoor heat exchanger 6 and the outdoor heat exchanger 7 side, the valves 62, 63 that operate in conjunction with the operation of the valves 42, 43 on the heat exchangers 2A, 2B side with the adsorbent By switching,
The outdoor heat exchanger 6 is a heat exchanger (3A or 3A) for the working medium of the adsorption type refrigeration unit (U ₁ or U ₂ ) on the regular regeneration stroke side.
B), and the indoor heat exchanger 7 is always connected to the adsorption refrigeration unit (U ₂ or U ₁ ) on the adsorption process side.
Then, in the outdoor heat exchanger 6, an action of releasing the condensation heat of the working medium W of one of the working medium heat exchangers (3A or 3B) to the outside is performed, and in the indoor heat exchanger 7, the other operation is performed. Indoor cooling is performed using the heat of vaporization of the working medium W of the medium heat exchanger (3B or 3A).

On the other hand, in the heating operation, contrary to the cooling operation, the outdoor heat exchanger 6 is constantly adsorbed to the working medium heat exchanger (3A).
3B), or the indoor heat exchanger 7 is connected to the working medium heat exchanger (3B or 3A) on the regular regeneration stroke side so that the valves 62 and 63 are connected to the heat exchangers with adsorbents 2A and 2B, respectively. valve
It is realized by switching control in conjunction with 42 and 43.

By the way, when performing the heating operation by using the adsorption type refrigerating apparatus as described above, since the adsorption type refrigerating units Ua and Ub use water as the working medium W, for example, the outside air temperature is 0 °. If the temperature drops below the value, freezing occurs on the surface of the working medium heat exchanger (3A or 3B) that functions as an evaporator, and heat transfer is impeded, resulting in insufficient heating performance. The problem that it cannot be obtained arises.

In order to deal with such a problem, the inventions of the present application are applied in this embodiment, and a substance having a property of lowering the freezing point of water in the working medium W, such as ethylene glycol, propylene glycol, or calcium chloride, is described below. And the like are mixed as an additive, and the concentration of the additive can be adjusted according to the outside air temperature, so that the heating capacity is prevented from lowering due to the freezing of the working medium as described above. .

Specifically, it is as follows. That is, in this embodiment, the concentrated solution tank 25A and the thin solution tank 25B are provided side by side in the vicinity of the working medium heat exchangers 3A and 3B. Each of the solution tanks 25A, 25B can be connected to the working medium reservoir of each of the adsorption type refrigeration units Ua, Ub via a first valve 31 and a second valve 32 which are flow path switching valves. Has been done. In addition, each solution tank 25A, 25B
Is selectively connectable to the suction port of the pump 26 via the third valve 33. Further, the discharge port of the pump 26 can be selectively connected to each of the adsorption type refrigeration units Ua, Ub via the fourth valve 34.

Further, each of these valves 31 to 34 corresponds to the "concentration adjusting means" in the claims and is for adjusting the concentration of the working medium W in the adsorption type refrigerating units Ua, Ub as described later. Therefore, as shown in FIG. 2, the adsorption type refrigeration unit
It is controlled in association with each other according to the operation process of UA and Ub.

That is, each of these valves 31 to 34 basically returns the low-concentration working medium Wbl after the completion of the regeneration process to the thin solution tank 25B at the time of switching between the regeneration process and the adsorption process, and the high pressure after completion of the adsorption process. The working medium Wal with a concentration is returned to the concentrated solution tank 25A and stored therein, and if necessary (in other words, in response to the possibility of icing), each adsorption type refrigeration unit (Ua, Ub)
It is controlled so that these can be supplied in predetermined amounts.

Incidentally, in FIG. 2, the operating positions of the valves 31 to 34 are schematically shown in correspondence with the piping system in FIG. For example, if the first valve 31 has a circle, it indicates that the first working medium heat exchanger 3A is connected to the concentrated solution tank 25A. That is, the operation of each valve or the like is performed in three steps when switching from the adsorption process to the regeneration process and the regeneration process to the adsorption process.

As an example, when the first adsorption type refrigeration unit Ua is switched from the regeneration process to the adsorption process and the second adsorption type refrigeration unit Ub is switched from the adsorption process to the regeneration process (ie, the first adsorption type refrigeration unit during heating operation). The case where the function of the working medium heat exchanger 3A of Ua changes from the condenser to the evaporator) will be described. In this case, however, the first adsorption refrigeration unit that functions as the evaporator in the next stroke. Ua
Since the operation differs depending on whether the working medium concentration of is further concentrated or diluted than that of the present time, this will be described separately.

First, in the former case (at the time of concentration), in this case, as the first step, each adsorption type refrigeration unit Ua, Ub
The working medium is collected from. That is, with the pump 26 stopped, the first valve 31 and the second valve 32 are operated to move the first adsorption type refrigeration unit Ua to the thin solution tank 25B,
Further, the second adsorption type refrigeration unit Ub is connected to the concentrated solution tank 25A, respectively, and the low concentration working medium Wal on the side of the first adsorption type refrigeration unit Ua immediately after the regeneration process is completed is transferred to the thin solution tank 2A.
The high-concentration working medium Wbl on the side of the second adsorption type refrigeration unit Ub immediately after the completion of the adsorption process is returned to the concentrated solution tank 25A in 5B.

Next, as the second step, the first to fourth valves 31 to 34
And closing the recovery passages 35 and 36 of the adsorption type refrigeration units Ua and Ub, respectively, and connecting the concentrated solution tank 25A to the first adsorption type refrigeration unit Ua side via the pump 26,
In this state, the pump 26 is operated to supply a predetermined amount of the concentrated solution Wc to the first adsorption type refrigeration unit Ua side, thereby securing the total working medium amount on the adsorption type refrigeration unit Ua side and Raise the freezing point of the medium to the required value.

When the amount of working medium on the side of the first adsorption type refrigeration unit Ua reaches a predetermined amount, then, as a third step, the fourth valve 34 is switched and operated so that the concentrated solution Wc is transferred to the second adsorption type refrigeration unit Ub.
When the concentrated solution tank 25A becomes empty, the third valve 33 is further operated to supply the thin solution Wd from the thin solution tank 25B side, and the second adsorption type refrigeration unit U is supplied. Secure the required amount of working medium on the _2nd side. That is, the concentrated solution Wc is always used in preference to the thin solution Wd, and the shortage is compensated by the thin solution Wd.

This completes the working medium concentration adjustment work when switching from the regeneration process to the adsorption process. Therefore, when the apparatus is operated in this state, the first adsorption type refrigeration unit Ua uses the high concentration working medium W for the adsorption action, and the second adsorption type refrigeration unit Ub uses the low concentration working medium W for the regeneration process. Will be started respectively.

On the other hand, at the time of dilution, the concentration is adjusted in the same manner as in the case of concentration in this case, but in this case, the thin solution Wd takes precedence over the concentrated solution Wc contrary to the case of concentration. It is supplied, and the shortage is supplemented by the concentrated solution Wc.

Such concentration or dilution of the working medium concentration is performed repeatedly by repeating each adsorption-type refrigeration unit (Ua, Ub each time the stroke is changed, so that the working medium heat on the side that functions as an evaporator during the cooling operation is Exchanger (3A or 3
In B), the working medium concentration is always operated in an optimally adjusted condition with respect to the outside air temperature. Therefore, even when the outside air temperature drops below 0 ° C,
A high level of heat exchange performance is ensured without causing the formation of ice on the surface of the heat exchanger for working medium (3A or 3B) to hinder its heat transfer property.

Incidentally, the operation of each of the valves 31 to 34 and the pump 26 as described above is basically performed during the heating operation and when it is recognized that the concentration adjustment is necessary from the outside air temperature (that is, it corresponds to the current concentration. (When the freezing point is lower than the outside air temperature and needs to be at a higher concentration, or when the outside air temperature is higher than necessary and the concentration needs to be lowered)
In other cases, for example, when the current concentration seems to be appropriate in light of the outside air temperature, or during cooling operation in which there is no risk of freezing in the evaporator, the first and second valves 31,3
Recovery passage from each adsorption type refrigeration unit (Ua, Ub)
The operation is performed with both 35 and 36 blocked,
In addition to this, even when the concentration of the working medium W in the working medium system changes over time, for example, when the concentration changes due to the solidification of the additive on the pipe wall or the leakage of water, the concentration of the working medium W is corrected by operating these. It is also possible to do.

Further, in this embodiment, the first to fourth valves 31 to 34 are
And the pump 26 constitute the “supplying means 27” in the claims.

[Brief description of drawings]

FIG. 1 is an overall system diagram of an adsorption refrigeration apparatus according to an embodiment of the present invention, FIG. 2 is an operation characteristic diagram of a valve provided in the adsorption refrigeration apparatus, and FIG. 3 is a conventional general adsorption refrigeration apparatus. It is a system diagram of an apparatus. 1A, 1B ………… closed container 2A, 2B ………… heat exchanger with adsorbent 3A, 3B ………… heat exchanger for working medium 4 …………………… heater 5 ………… ………… Cooler 60 …………………… Outdoor heat exchanger 7 …………………… Indoor heat exchanger 11A 11B ……… Heat exchanger body 12A, 12B …… Adsorbent 25A …… ………… Concentrated solution tank 25B ……………… Thin solution tank 26 …………………… Pump 31 to 34 ………… Valve

Claims (2)

(57) [Claims] 1. A closed container (1A, 1B) filled with a working medium (W) that changes in phase between a gas phase and a liquid phase receives a cooling fluid or a heating fluid and is cooled. A heat exchanger (2A, 2B) with an adsorbent that adsorbs the working medium (W) when receiving the working fluid, and releases the working medium (W) when receiving the heating fluid; Exchanger (2A,
2B) The adsorption and release of the working medium (W) causes heat exchange with the working medium (W), thereby causing the working medium (W) to vaporize or condense. And a heat exchanger (3A, 3B) for heat transfer, and when the working medium (W) is adsorbed by the heat exchanger (2A, 2B) with an adsorbent, the heat exchange for the working medium is performed by the latent heat of vaporization of the working medium (W). While cooling the fluid supplied to the vessel (3A, 3B), when the working medium (W) is released by the heat exchanger with adsorbent (2A, 2B), the heat of condensation generated from the working medium (W) is used for the above operation. An adsorption type refrigeration system comprising a plurality of adsorption type refrigeration units (Ua, Ub) arranged in parallel so as to be removed by a fluid supplied to a medium heat exchanger (3A, 3B). (W) is mixed with an additive having a property of lowering the freezing point, while the concentration of the additive is increased. An adsorption type refrigerating apparatus comprising concentration adjusting means (31, 32, 33, 34) for changing and adjusting the temperature according to the outside air temperature. 2. The adsorption refrigeration apparatus according to claim 1, wherein, of the adsorption refrigeration units (Ua, Ub), the operation of one adsorption refrigeration unit (Ua or Ub) that has completed its adsorption process. Liquid medium (Wal) of medium heat exchanger (3A or 3B)
Solution tank (25A) that collects and stores the liquid, and the liquid medium (Wbl) of the heat exchanger (3B or 3A) for the working medium on the side of the other adsorption type refrigeration unit (Ua or Ub) that has completed the regeneration process
A thin solution tank (25B) for collecting and storing the above, and a thin solution (Wc) in the concentrated solution tank (25A) or a thin solution (Wd) in the thin solution tank (25B) depending on the ambient temperature. Supply means (27) for supplying to the heat exchanger (3A, 3B) for working medium
An adsorption type refrigerating apparatus comprising: