MXPA00004710A - Dehumidifier system - Google Patents

Abstract

A dehumidifier system (10) comprising:a dehumidifying chamber (12) into which moist air is introduced and from which less moist air is removed after dehumidification;a desiccant solution (28) situated in at least one reservoir (30);a first conduit (13) via which desiccant solution (28) is transferred from the at least one reservoir (30) to the dehumidifying chamber (12), said solution being returned to said at least one reservoir (30) after absorbing moisture from the moist air;a regenerator (32) which receives desiccant solution from said at least one reservoir and removes moisture from it;a second conduit via which desiccant is transferred from the at least one reservoir (30) to the regenerator (32), said solution being returned to said at least one reservoir after moisture is removed from it;and a heat pump (44) that transfers heat from the solution in the first conduit to the solution in the second conduit.

Description

DEHUMIDIFIER SYSTEM FIELD OF THE INVENTION This invention is in the field of dehumidification and in particular is related to the improved efficiency of desiccant type dehumidifiers.

BACKGROUND OF THE INVENTION Large scale air dehumidifier systems based on desiccating agent are associated with two main problems. One problem is that the dry air produced is hotter than the moist air fed. This result is caused by the heating of the air by the latent heat of the evaporation when moisture is removed from it and also, to a lesser degree, by the heating of the air by heat transfer of the generally hotter desiccant. A second problem is that regeneration of the desiccant requires considerable energy. Dehumidification systems based on liquid desiccants dehumidify the air by passing air through a tank filled with desiccant. Humid air enters the tank via a wet tank inlet and dry air leaves the tank via a dry air outlet. In a type of desiccant system, a desiccant bath is sprayed from a reservoir into the tank and, as the desiccant drops descend through the humid air, they absorb the water from it. The desiccant is then returned to the reservoir to be reused. This produces an increase in the water content of the desiccant. The saturated desiccant of water accumulates in the reservoir and is pumped from it to a regenerative unit where it is heated to remove its water absorbed as steam. The regenerated desiccant, which is heated in this process, is pumped back to the reservoir, to be reused. Since the water absorption process leads to the heating of the air and the regeneration process heats the desiccant, a substantial heating of the air takes place during the water absorption process. An example of a device using a circulating hygroscopic liquid such as a LiCl desiccant is disclosed in U.S. Pat. No. 4,939,906. In this patent a boiler with finned tubes is provided for the flow of the hot desiccant. This patent also describes preheating the saturated desiccant before it enters the boiler for final regeneration by transferring heat to it from the desiccant that leaves the tank.

Other variations of systems using recirculated desiccant solutions to dehumidify air are shown in U.S. Pat. Nos. 4,635,446, 4,691,530 and 4,723,417. Many of these systems use heat transfer from one portion of the dehumidifier to another to improve its efficiency. In general, the regeneration of the liquid desiccant requires its heating with the concomitant energy expenditure.

BRIEF DESCRIPTION OF THE INVENTION The present invention, in some embodiments thereof, is designed to utilize the heat transfer in a new form in the process to regenerate its liquid desiccant, thereby increasing the overall efficiency of the system. In a preferred embodiment of the invention a heat pump extracts heat from liquid desiccant, preferably in a heat collecting unit and transfers the heat to a heating coil in a regenerative unit, thereby reducing the total energy required by the system. In addition, this energy transfer has the effect of cooling the desiccant that comes into contact with the humid air entering the system. In this way, the dry air leaving the system is cooler than it would be in the absence of heat transfer. Furthermore, in the preferred embodiments of the invention, the heat energy in one or more of the air charged with moisture leaving the regenerator, the hot desiccant, which leaves the regenerator and the air leaving the dehumidifier is used to heat the desiccant to be regenerated either towards it, or in the regenerative tank. According to an aspect of some preferred embodiment of the invention, a dehumidifier is provided in which the relative humidity of the treated air is regulated automatically, so that the relative humidity of the air leaving the dehumidifier remains relatively constant as the temperature or humidity of the air entering the dehumidifier falls. The air temperature of the outgoing air preferably depends on the conditions of the inlet air, with the outlet air temperature falling with the lower inlet / relative humidity temperature. Thus, according to a preferred embodiment of the invention, a dehumidifying system is provided comprising: a dehumidification chamber in which moist air is introduced and from which less humid air is removed after dehumidification; a desiccant solution located in at least one reservoir; a first conduit via which the desiccant solution is transferred from at least one reservoir to the dehumidification chamber, the solution is returned to at least one reservoir after absorbing moisture from the humid air; a regenerator, which receives desiccant solution from the at least one reservoir and removes moisture from it; a second conduit, via which the desiccant is transferred from at least one reservoir to the regenerator, the solution is returned to at least one reservoir after the moisture is removed from it; and a heat pump that transfers heat from the solution in the first conduit to the solution in the second conduit. Preferably, the heat pump comprises a first heat exchanger, which receives heat from the solution in the first conduit, a second exchanger that receives heat from the solution in the second conduit and a compressor. Preferably, the regenerator comprises a regenerative chamber in which the moisture is removed from the solution by contact with the air that is brought into the chamber. Preferably, the compressor is cooled by the air before it enters the regenerator chamber, so that the moisture removal capacity of the air is increased. In a preferred embodiment of the invention, the heat pump includes an additional heat exchanger, which transfers heat from a refrigerant after the refrigerant leaves the second heat exchanger. Preferably, the regenerator comprises a regenerative chamber in which the moisture is removed from the solution by contact with the air that is carried into the chamber. Preferably, the additional heat exchanger is cooled by the air before it enters the regenerator chamber, so that the moisture removal capacity of the air is increased. In a preferred embodiment of the invention, the system includes a control that controls the amount of heat transferred by the heat pump. In a preferred embodiment of the invention, at least one reservoir comprises a first reservoir from which solution is transferred via the first conduit and a second reservoir from which solution is transferred via the second conduit. Preferably, a substantial temperature difference between the first and second reservoirs is maintained.

Preferably, the system includes a conduit connecting the first and second reservoirs, so that the level of solution in them is substantially the same. There is further provided, with a preferred embodiment of the invention, a dehumidifying system comprising: a dehumidification chamber in which moist air is introduced and from which less moist air is removed after dehumidification; a desiccant solution located in a first reservoir; a first conduit via which the desiccant solution is transferred from the first reservoir to the dehumidification chamber, the solution is returned to at least one reservoir after absorbing moisture from the humid air; a desiccant solution located in a second reservoir; a regenerator, which receives desiccant solution from the second reservoir and removes moisture from it; a second conduit via which the desiccant is transferred from the second reservoir to the regenerator, the solution is returned to the second reservoir after the moisture is removed from it; and where a substantial temperature difference between the first and second reservoirs is maintained. Preferably, the system includes a conduit connecting the first and second reservoirs, so that the level of solution in them is substantially the same. Preferably, the conduit provides only limited mixing between the two reservoirs, so that a substantial temperature difference between them is maintained. Preferably, the temperature difference is at least 5 ° C, such as at least 10 ° C or at least 15 ° C. Preferably, the system includes means for providing an additional limited amount of mixing between the two reservoirs. There is further provided, according to a preferred embodiment of the invention, an air dehumidification device, which includes: an enclosure including an apparatus for modifying the air entering the apparatus via an air inlet having an air outlet for the modified air; a first duct having an air inlet and an outlet in communication with the inlet; a second conduit having an outlet and an inlet in communication with the outlet; and a mounting surface adapted to mount the device on a partition, so that the enclosure is on a first side of the partition and the entrance to the first conduit and the outlet of the second conduit are located on a second side of the partition. Preferably, the conduits convey air from the first side of the gap to the second side of the gap. Preferably, the mounting surface is adapted to be mounted on a window pane and the system includes a seal around the conduits that seals the first side of the separation of the second side of the partition, when a window is closed over the conduits . In a preferred embodiment of the invention, the apparatus for modifying air is a dehumidifier. In a preferred embodiment of the invention, the apparatus for modifying air is a conditioner that includes a heat pump that cools the air entering the inlet by contact with a cold surface of the heat pump. In a preferred embodiment of the invention, the apparatus for modifying air is a combination of dehumidifier and air conditioner including a heat pump that cools the air entering the inlet by contact with a cold surface of the heat pump.

In a preferred embodiment of the invention, the dehumidifier is a dehumidifier system as described herein.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be understood more clearly and completely from the following detailed description of the preferred embodiments thereof, in which the same reference numbers in the different drawings correspond to the same characteristics, read in conjunction with the drawings in which: Figure 1 shows schematically a dehumidifying unit, according to a preferred embodiment of the invention; Figure 2 schematically shows a second dehumidifying unit, according to a preferred alternative embodiment of the invention; Figure 3 schematically shows a system for moistening a sponge with desiccant solution, according to a preferred embodiment of the invention; and Figure 4 shows a preferred construction for a dehumidifying unit mounted in a window according to a preferred embodiment of the invention.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES A dehumidification system 10, according to a preferred embodiment of the invention, comprises, in its two main sections, a dehumidification chamber 12 and a regenerative unit 32. The humid air enters the dehumidification chamber 12 via a moist air inlet 14 and dry air leaves the chamber 12 via a dry air outlet 16. In a preferred embodiment of the invention, the desiccant 28 is pumped by a pump 20 of a desiccant reservoir 30 via the tube 13 to a series of nozzles 22. The nozzles spray a fine mist of desiccant into chamber 12, which is preferably filled with a cellulose sponge material 24 as is generally used in the art for such purposes. The desiccant is slowly filtered down through the sponge material into the reservoir 30. The moist air entering the chamber via the inlet 14 comes in contact with the desiccant drops. Since the desiccant is hygroscopic, it absorbs water vapor from the humid air and expels dry air through the outlet 16. Preferably, the reservoir 30 is located on the bottom of the chamber 12, so that the desiccant from the sponge 24 falls directly into the reservoir.

In a preferred embodiment of the invention, the pump 35 and associated motor 37 pump desiccant from an extension of the reservoir 30 to the tube 13. A divider 38 receives desiccant from the tube 13 and sends part of the desiccant to the nozzles 22 and leaves a the regenerative unit 32. A valve or restriction 39 (preferably a valve or controllable restriction) can be provided to control the proportion of desiccant that is fed to the regenerator 32. If a valve or controllable restriction is used, the amount of the desiccant is preferably controlled in response to the amount of moisture in the desiccant. Chamber 34 includes an exchanger 36, which heats the desiccant to remove some of the water vapor that has been absorbed, thus regenerating it. The reclaimed liquid desiccant is transferred back to the reservoir 30 via the tube 40 and a tube 42 or sponge material such as that which fills the chamber 12. The tube 40 is preferably contained in a chamber 58, which has an inlet 60. and an outlet 62. The air, generally from outside the area in which the air is being modified, enters the chamber via the inlet 60 and carries additional moisture, which is evaporated from the hot desiccant still in the tube 42. The air that comes out at exit 62 carries this humidity and also humidity, which was removed from the desiccant in the regenerator. Preferably a fan (not shown) at the outlet 62 sucks air from the chamber 58. Alternatively or additionally, the heat is transferred from the regenerated liquid desiccant to the incoming desiccant or in the regenerator that puts in thermal (but not physical) contact ) the two desiccant streams in a thermal transfer station (not shown). Alternatively or additionally, a heat pump can be used to transfer additional energy from the cooler desiccant that leaves the regenerator to the hot desiccant entering the regenerator, so that the desiccant that returns to the reservoir is actually colder than the desiccant that enters the chamber 34. In a preferred embodiment of the invention, a heat pump system 44 is provided which extracts heat from the desiccant in the reservoir 30 to provide power to the heat exchanger 36. Preferably, this heat pump includes (in addition to the exchanger 36, which is the condenser of the system), a second heat exchanger 46 in reservoir 30, which is the evaporator of the system, and an expansion valve 56. This energy transfer results in a reduced temperature of the desiccant which comes into contact with the air that is being dried, thus reducing the temperature of the dry air. Secondly, this energy transfer reduces the total energy requirement to operate the regenerator, generally by a factor of 3. Since the energy used by the regeneration process is the highest energy requirement of the system, this reduction in the The use of energy can have a greater effect on the overall efficiency of the system. Additionally, this method of heating the desiccant in the regenerator can be supplemented by direct heating, using a heating coil. It should be understood that the proportion of water vapor in the desiccant in the reservoir 30 and in the regenerated reservoir should generally be within certain limits, limits which depend on the particular desiccant used. A lower limit on the level of moisture required is that necessary to dissolve the desiccant, so that the desiccant is in solution in the humidity. However, when the humidity level is too high, the desiccant becomes inefficient by removing moisture from the air entering the chamber 12. In this way, it is necessary that the humidity level is checked and controlled. It should be noted that some desiccant is liquid even in the absence of absorbed moisture. The moisture level in these desiccants does not need to be tightly controlled. However, even in those cases, the regeneration process (which uses energy) should be carried out only when the moisture level in the desiccant is above a level. The verification function is generally carried out by measuring the volume of desiccant, which increases with the increase in humidity. A preferred method for measuring the liquid in the reservoir is by measuring the pressure in an inverted vessel 50 having its opening placed in the liquid in the reservoir. A tube 52 leads from the container 50 to a pressure meter 52. When the volume of the desiccant is increased due to the absorption of moisture, the pressure measured by the pressure meter 52 increases. Since the liquid in the chamber and in the regenerator is almost constant, this gives a good indication of the amount of desiccant and thus the amount of moisture introduced into the desiccant. When the humidity level is increased above a preset value, the heat in the chamber 32 is activated. In a preferred embodiment of the invention, when the moisture level falls below some other preset value, the heat is interrupted.

Other factors that can influence the entry and exit points of the regeneration process are the dry air temperature, the efficiency of the regeneration and the efficiency of the heat pump. In some preferred embodiments of the invention, especially in cold air systems (such as for ice skating rinks) it may be contemplated to provide some direct heating of the desiccant in the regeneration process. In other preferred embodiments of the invention, heat pumps or other heat transfer means (not shown for simplicity) are provided to transfer heat from the dry air leaving the chamber 12 and the hot moist air leaving the regenerative chamber 34, to heat the desiccant on its way to or in the chamber 34. If heat pumps are used, the heat source may be at a lower temperature than the desiccant to which it is transferred. It should be understood that cooling the desiccant in the reservoir may result in dry air leaving the dehumidifier having the same, or preferably, a lower temperature than humid air entering the dehumidifier, even before any optional cooling additional dry air. This feature is especially useful where the dehumidifier is used in hot climates in which the temperature is already high. As indicated above, one of the problems with the dehumidifier system is the problem of determining the amount of water in the desiccant solution, so that the water content of the dehumidifier solution can be maintained in an appropriate range. A dehumidifier 100, according to a preferred embodiment of the present invention, is shown in Figure 2. This dehumidifier is automatically regulated with respect to the water content of the desiccant solution and thus does not require any measurement of the volume or content of the dehumidifier. water from the desiccant solution. In addition, the dehumidifier operates until a predetermined humidity is reached and then stops reducing the humidity, without any control or cutting. The dehumidifier 100 is similar to the dehumidifier 10 of Figure 1, with several significant differences. First, the system does not require any measurement of the water content and thus, does not have a volumetric measurement of the desiccant. However, such a measurement can be provided as a safety measure if the solution is too concentrated.

Second, the heat pump transfers heat between two streams of desiccant solution that are being transferred from reservoir 30 (which is conveniently divided into two portions 30A and 30B connected by tubes 30C) namely a first flow being pumped to nozzles 22 by a pumping system 130, via a conduit 102 and a second flow being pumped to the regenerative unit 32 by a pumping system 132, via a conduit 104. Preferably, the tubes 30C (including the deflection tubes shown) are designed so that its main effect is to generate a common level of solution in portions 30A and 30B. In general, it is desirable that the two portions of the reservoir have different temperatures. This necessarily results in different concentrations of desiccant. However, it is generally considered desirable to provide some mixing between the two portions, by some pumping via the deflection tubes shown to transfer moisture from one portion to the other. In a preferred embodiment of the invention, a temperature difference of 5 ° C or more, more preferably, of 10 ° C or more and more preferably 15 ° C or even more, is maintained. Thus, in a preferred embodiment of the invention, the portion 30A of the reservoir is at a temperature of 30 ° C or more and the portion 30B of the reservoir is at a temperature of 15 ° C or less. In Figure 2, a different construction is shown for the regenerative unit 32, which is similar to the section of the dehumidifier. Furthermore, in Figure 2, no section has a cellulose sponge material, which may be present or absent from any of the embodiments of Figure 1 or Figure 2. In a preferred embodiment of the invention, applicable to any of Figures 1 or 2, the spray nozzles are not used. Instead, the spray nozzles are replaced by a drip system from which liquid is dripped onto the cellulose sponge to continuously wet the sponge. Figure 3 shows a preferred embodiment of a drip system for wetting the sponge 24. In this system an open duct 200, preferably in the form of a half-tooth tube filled with desiccant solution 28. The desiccant solution flows through the teeth along the length of the canal and wet the sponge evenly. In most cases, the use of a sponge is preferred, without dew, since the use of a spray results in the dispersion of the desiccant solution in the air, which must be removed from the air. Other methods of wetting or moistening the sponge 24 will occur to those skilled in the art and any such methods may be utilized in the practice of the invention. Returning to Figure 2, the heat pump system 44 extracts heat from the desiccant solution in the conduit 102 and transfers this to the desiccant in the conduit 104. The heat pump system 44 preferably contains, in addition to the components contained in the embodiment of Figure 1, an optional heat exchanger 136 for transferring some of the heat of the refrigerant having the heat exchanger 104 to the regeneration air. Preferably, the compressor is also cooled by the regeneration air. However, when the air is very hot, the additional air, not used in the regenerator, can be used to cool the compressor and the refrigerant. Alternatively, only such air is used for such cooling. The resulting heating of the air entering the regenerator increases the capacity of the air to remove moisture from the desiccant. The heat pump 44 is adjusted to transfer a fixed amount of heat. In a preferred embodiment of the invention, the moisture reference point is determined by controlling the amount of heat transferred between the two flows. Consider the system shown in Figure 2, with the air entering the dehumidifying chamber 12 at 30 degrees C and 100% humidity. Suppose, in addition, that the amount of liquid removed from the air reduces its humidity to 35% without reducing the temperature. In this situation, the amount of heat transferred between the desiccant solution flows would be equal to the heat of vaporization of the water removed from the air, so that the temperature of the desiccant solution falling into the reservoir 20 of the chamber 12 is at the same entering temperature, except that it has absorbed a certain amount of moisture from the air. Suppose, in addition, that the regenerator was adjusted, so that at this same temperature and humidity remove the amount of water from the desiccant solution. This may require a heat input (in addition to the heat available from the heat pump). Furthermore, suppose that the air entering the dehumidifying chamber has a lower humidity, for example 80%. For this humidity, less liquid is removed (since the efficiency of the water removal depends on the humidity) and in this way, the temperature of the desiccant solution that leaves the dehumidifying chamber also falls. However, since less water enters the drying solution of the dehumidifying chamber, the amount of water removed from the solution in the regenerator also drops. This results in a new equilibrium with less water removed and the desiccant solution at a lower temperature. A lower desiccant temperature results in cooler air. In this way, the temperature of the air that comes out is also reduced. However, the relative humidity remains substantially the same. It should be understood that a reduction in the temperature of the inlet air has substantially the same effect. In a preferred embodiment of the invention, the system self-regulates, with the cutting of the dehumidifying action at some moisture level. The level of humidity at which this takes place will depend on the ability of the solution sprayed from the nozzle 22 to absorb moisture and the capacity of the solution and the capacity of the solution sprayed from the nozzles 22 'to release moisture. In general, when the air in the inlet 14 becomes less humid (relative humidity) the humidifier becomes less able to remove moisture. In this way, the solution is cooled every time it passes through the conduit 102 and the percentage of desiccant in the solution 30B reaches some level. Similarly, when less moisture is removed from the air, the 30A solution becomes more concentrated and less moisture is removed from it (all that happens is that it gets hotter). At some point, both the removal and absorption of moisture by the solution is stopped, since the respective sprayed solution is stabilized with the air to which or from which moisture is transferred. It should be understood that this humidity point can be adjusted by changing the amount of heat transferred between the solutions in conduits 102 and 104. If more heat is transferred, the transfer capacity of both the dehumidification chamber and the regenerator is increased and the moisture balance point decreases. The less heat pumped, the more moisture will result. In addition, the reference point will depend somewhat on the relative humidity of the air entering the regenerator. Figure 4 shows schematically a dehumidifier system mounted in a window 110, according to the preferred embodiments of the invention. In this embodiment, the entire unit shown in Figures 1 6 2 is contained in an enclosure 112, which hangs out of a window 114 of a room. Preferably, the system 110 includes a U-shaped support unit, which rests on the window leaf 118 and is firmly attached to the closure 112. Passing through the window 112 are two conduits, 14 and 15 corresponding to the air inlet 14 and the dehumidified air outlet 16 of Figures 1 and 2. The window closes on top of the ducts to seal the room from the outside. An electrical power supply cable 120 is connected to an energy outlet inside the window and supplies power to the dehumidifying unit. Preferably, a board is located within the window on which controls are mounted and which provides a suitable gate for the entrance 14 and the exit 16. Figure 3 also shows the entrance 60 and the exit 62 used to transport air hot loaded with moisture. Additionally, the inlet 60 can provide a controllable amount of fresh air to the room. In a further preferred embodiment of the invention, the configuration of Figure 4 was used for a combination air conditioner and dehumidifier for a conventional air conditioning mechanism, which includes a heat pump that cools the air entering the inlet by contact with a cold surface of the heat pump. For an air conditioner, both heat exchangers would be out of the window with the air in the room being fed to the condenser of the air conditioner via line 14 and from this, via line 16 to the room to be cooled. Units such as those shown in Figure 4 provide less noise in the air conditioning units divided with the convenience of mounting in the window. When the terms "comprising" or "including" or their conjugates are used in the following claims, they mean "that include but are not necessarily limited to". The present invention has been described using a preferred embodiment thereof. It should be understood that many variations of the preferred embodiment within the scope of the invention are possible, as defined in the following claims, and will occur to those skilled in the art. It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it relates.

Claims (32)

1. A dehumidifying system, characterized in that it comprises: a dehumidification chamber in which moist air is introduced and from which less humid air is removed after dehumidification; a desiccant solution located in at least one reservoir; a first conduit via which the desiccant solution is transferred from at least one reservoir to the dehumidification chamber, the solution is returned to at least one reservoir after absorbing moisture from the humid air; a regenerator, which receives desiccant solution from at least one reservoir and removes moisture from it; a second conduit via which the desiccant is transferred from at least one reservoir to the regenerator, the solution is returned to at least one reservoir after moisture is removed from it; and a heat pump that transfers heat from the solution in the first conduit to the solution in the second conduit.

2. The system according to claim 1, characterized in that the heat pump comprises a first heat exchanger which receives heat from the solution in the first conduit, a second heat exchanger that receives heat from the solution in the second conduit and a compressor.

The system according to claim 2, characterized in that the regenerator comprises a regenerative chamber in which moisture is removed from the solution, by contact with the air that is brought to the chamber.

4. The system according to claim 3, characterized in that the compressor is cooled by the air before entering the regeneration chamber, so that the air removal capacity increases.

The system according to claim 2, characterized in that the heat pump includes an additional heat exchanger, which transfers heat from a refrigerant after the refrigerant leaves the second heat exchanger.

The system according to claim 5, characterized in that the regenerator comprises a regenerative chamber, in which moisture is removed from the solution by contact with the air that is brought to the chamber.

The system according to any of the preceding claims, characterized in that the additional heat exchanger is cooled by the air before its entry into the regeneration chamber, so that the moisture removal capacity of the air is increased.

The system according to any of the preceding claims, characterized in that it includes a control that controls the amount of heat transferred by the heat pump.

The system according to any of the preceding claims, characterized in that at least one reservoir comprises a first reservoir from which solution is transferred via the first conduit and a second reservoir from which solution is transferred via the second conduit.

The system according to claim 9, characterized in that it includes a conduit connecting the first and second reservoirs, so that the level of solution in them is substantially the same.

The system according to claim 10, characterized in that it includes means for providing a further limited amount of mixing between the two reservoirs.

The system according to claim 13, characterized in that the limited mixing results in a difference in the concentration of the solution between the solution in the first and second reservoirs.

The system according to claim 9, characterized in that a substantial temperature difference between the first and second reservoirs is maintained.

The system according to claim 13, characterized in that the first reservoir is maintained at a first temperature and the second reservoir is maintained at a second temperature, at least 5 ° C higher than the first temperature.

15. The system according to claim 13 or claim 14, characterized in that it includes a conduit connecting the first and second reservoirs, so that the level of solution in them is substantially the same.

16. The system according to claim 19, characterized in that the conduit provides only limited mixing between the two reservoirs, so that the temperature difference is maintained between them.

The system according to claim 16, characterized in that it includes means for providing a further limited amount of mixing between the two reservoirs.

18. The system according to claim 18, characterized in that the limited mixing results in a concentration difference of the solution between the solution in the first and second reservoirs.

19. A dehumidifier system, characterized in that it comprises: a dehumidification chamber in which moist air is introduced and from which less humid air is removed after dehumidification; a desiccant solution, at a first temperature, located in a first reservoir; a first conduit via which desiccant solution is transferred from the first reservoir to the dehumidification chamber, the solution is returned to at least one reservoir after absorbing moisture from the humid air; a desiccant solution, at a second temperature, the second temperature is at least 5 ° C higher than the first temperature, located in a second reservoir; a regenerator which receives desiccant solution from the second reservoir and removes moisture from it; a second conduit via which desiccant is transferred from the second reservoir to the regenerator, the solution is returned to the second reservoir after the moisture is removed from it.

The system according to claim 19, characterized in that it includes a conduit connecting the first and second reservoirs, so that the level of solution in them is substantially the same.

The system according to claim 20, characterized in that the conduit provides only limited mixing between the two reservoirs, so that the temperature difference between them is maintained.

22. The system according to claim 21, characterized in that it includes means for providing an additional amount of mixing between the two reservoirs.

23. The system according to claim 22, characterized in that the limited mixing results in a concentration difference in the solution between the solution in the first and second reservoirs.

24. The system according to any of claims 13-23, characterized in that the temperature difference is at least 10 ° C.

25. The system according to claim 24, characterized in that the temperature difference is at least 15 ° C.

26. A device for modifying air, characterized in that it includes: an enclosure including an apparatus for modifying the air entering the apparatus via an air inlet having an air outlet for the modified air; a first duct that has an inlet for the air and an outlet that communicates with the inlet; a second conduit having an outlet and an inlet communicating with the outlet; and a mounting surface adapted to mount the device on a partition, so that the enclosure is on a first side of the partition and the entrance to the first conduit and the outlet of the second conduit are located on the second side of the partition.

27. The device according to claim 26, characterized in that the conduits convey air from the first side of the division to the second side of the division.

The device according to claim 27, characterized in that the mounting surface is adapted to be mounted on the window leaf and includes a seal around the ducts sealing the first side of the division of the second side of the partition, when a window is closed on the conduits.

29. The device according to any of claims 26-29, characterized in that the apparatus for modifying the air is a dehumidifier.

30. The device according to any of claims 26-28, characterized in that the apparatus for modifying the air is an air conditioner that includes a heat pump that cools the air entering the inlet by contact with a cold surface of the air. the heat pump.

The device according to any of claims 26-28, characterized in that the apparatus for modifying the air is a combination of a dehumidifier and an air conditioner, which includes at least one pump that cools the air entering the inlet pro contact with a cold surface of the heat pump.

32. The device according to any of claim 29 or claim 31, characterized in that the dehumidifier is a dehumidifier system in accordance with claim 25.