JP6165150B2 - Dehumidifier and method of using the same - Google Patents

Description

  The present invention relates to a dehumidification system and method, and more particularly, to a liquid desiccant regenerator (LDR) for dehumidification of air in an enclosure, and a method for dehumidification.

  Patent Document 1 shows a desiccant (brine) regenerator based on a vapor compressor. Regeneration retains the desiccant as a concentrate because effective steam is reduced even under high humidity conditions. Patent document 2 discloses a system for dehumidification of air in an enclosure, which system is used for heating cold fresh air taken into a heat exchanger from the outside and by condensation of steam. An air / brine heat exchanger is included to dehumidify the air inside the enclosure.

  U.S. Patent No. 6,057,031 discloses an air conditioning system and / or heating system in combination with a solar pond, and it is important to maintain a salt concentration that increases with the depth of the solar pond. The solar pond is regenerated. That is, the salt concentration gradient is maintained by components of the air conditioning system or by a special concentrator tower, where moisture is removed from the brine circulating from the solar pond to the tower.

  Patent Document 4 discloses a hybrid air conditioning system in which a solar cell type LiCl dehumidifier is combined with a LiBr absorption type refrigerator. The desiccant dehumidifier removes the potential load by absorbing moisture from the atmosphere, and the overt load is removed by the absorption refrigerator. The desiccant dehumidifier is connected to a regenerator, and the desiccant in the regenerator is heated by hot water heated by solar heat, so that the moisture is removed from the regenerator before being sent back to the dehumidifier. The heat of vaporization consumed in the desiccant regenerator is recovered and used to pre-heat a portion of the absorption chiller drive fluid, thereby significantly improving the overall COP of the hybrid system.

  U.S. Pat. No. 6,057,049 in the name of the applicant discloses an air conditioning system for the environment in the enclosure, which is in fluid communication with a brine / air heat exchanger via a heat exchanger. A brine regenerator in fluid communication with an air / water cooling tower and a brine / air heat exchanger, the brine / air heat exchanger having an outlet and an inlet to the enclosure.

  Patent document 6 in the name of the applicant discloses a liquid desiccant regenerator dehumidification system comprising a desiccant / air heat exchanger having a first desiccant inlet and a desiccant container. Including. The container has a first desiccant outlet, a second desiccant outlet, and a first desiccant inlet. The first desiccant inlet and the first desiccant outlet are connected to a heat source, the second desiccant inlet conducts the diluted desiccant of the container, and the second desiccant outlet is the container. Conduct the concentrated desiccant from The second desiccant inlet and the second desiccant outlet are connected to a desiccant / desiccant heat exchanger to apply heat to the diluted desiccant flowing into the container. Both the desiccant heat exchanger and the desiccant container are exposed to air. The system pumps concentrated liquid desiccant from a desiccant container to a heater and the mass flow rate of the desiccant stream entering the regenerator is at least twice the mass flow rate of condensed water. At such a rate, the heated and concentrated liquid desiccant is dehumidified by returning it from the heater to the first desiccant inlet. The desiccant regenerator replaces the diluted desiccant flowing into the regenerator via the outlet with the concentrated desiccant discharged from the starting desiccant outlet at the first desiccant outlet and from the regenerator In order to incorporate soot into the steam condenser, the temperature of the concentrated desiccant is higher than the temperature of the diluted desiccant, and the heat raises the temperature of the diluted desiccant, which acts as a steam sink.

  In the dehumidifier of Patent Document 6, dry warm air exits the dehumidifier with the same enthalpy as the cold moisture trapped inside. This is accomplished by the fact that moisture in the air condenses on the brine, which warms the brine and the brine warms the atmosphere. In other words, the adiabatic dehumidifier converts the latent heat of water vapor in the air into sensible heat. That is, the temperature rises.

  In the dehumidifier of Patent Document 6, the desiccant is placed in moist air and absorbs water vapor from the air to dry the air. By doing so, the water vapor in the air changes phase, so that latent heat is converted to sensible heat and the desiccant is warmed. Heat from the desiccant is transferred to the surrounding atmosphere until the temperature of the desiccant reaches an equilibrium point high enough to release all potential energy into the air for sensible heat. In the constant enthalpy dehumidifier described in U.S. Patent No. 6,057,049, this imposes an effective limit on the amount of water that can be removed, as described below. One gram of water has a latent heat of 2,500 joules. The specific heat of air is 1,000 Joules / kg / ° C. Therefore, to maintain a constant enthalpy of air when condensing 1 gram of water vapor in a 1 kg air mixture, the air temperature must be increased by 2.5 ° C. This heat can only be provided by the desiccant, so the desiccant must be warmer than air at least by this temperature. This places a limit on the amount of water vapor in the air that can be removed. This is because the greater the amount of water vapor condensed from the air, the higher the temperature gradient between the desiccant and the air. However, the hotter the desiccant, the less effective it is as a drying agent.

  Similarly, when the desiccant absorbs water vapor, the desiccant becomes thinner and less effective and for this purpose a regenerator is provided to remove the absorbed water vapor from the desiccant and concentrate it in a dehumidifier container. It plays the role of returning the desiccant. Again, there is a practical limit to the concentration of desiccant, while the more concentrated the desiccant, the higher the efficiency of the dehumidifier, while the more concentrated the desiccant. The more it is made, the more difficult it is for the regenerator to remove the absorbed water vapor.

  As an example, to remove 3 grams of water vapor per kilogram of air in the constant enthalpy (ie, adiabatic) dehumidifier disclosed in US Pat. There must be. That is, the partial vapor pressure of the desiccant in the dehumidifier must be 0.3 and its temperature must be about 30 ° C. Nevertheless, many desiccants crystallize with this activity, thereby making it impossible to eliminate the required humidity, and desiccants such as LiCl and LiBr that do not crystallize with this activity are effective. Furthermore, the desiccant that evaporates in the regenerator is more concentrated than the desiccant in the dehumidifier, and therefore its partial vapor pressure is low, for example 25%. Evaporating the desiccant with this activity requires hot desiccant and cold water in the regenerator, thus making it virtually impossible to remove heat from the water. One solution to avoid desiccant crystallization, as proposed in US Pat. No. 5,637,086, is to reduce the mass flow rate of the desiccant stream in the regenerator to the mass flow rate of condensed water in the dehumidifier. It is to at least double.

  Thus, it is possible to remove large amounts of humidity from the air, while air that does not require highly concentrated desiccant to facilitate effective regeneration without the risk of desiccant crystallization. It would be desirable to find alternative ways of drying.

US Pat. No. 6,266,975 US Pat. No. 6,463,750 US Pat. No. 4,355,683 US Pat. No. 4,205,529 International Publication WO 03/004937 US Pat. No. 7,938,888

  It is an object of the present invention to provide a dehumidifier that allows a greater amount of humidity to be removed from the air than previously proposed systems and does not require a highly concentrated desiccant.

In accordance with the present invention, a dehumidifier for removing moisture from the air inside an enclosure is provided,
A desiccant container inside the enclosure having a desiccant inlet for adding concentrated liquid desiccant and a desiccant outlet for removing less concentrated liquid desiccant;
An air inlet in the enclosure downstream of the dehumidifier vapor condenser for containing humid air, and an air outlet in the enclosure upstream of the dehumidifier vapor condenser for entering dry air into the enclosure,
A pump connected to the desiccant outlet for sending water vapor from the humid air and warming the liquid desiccant from the desiccant container through the spray nozzle to the vapor condenser of the dehumidifier; and
Desiccant to remove moisture from the less concentrated liquid desiccant communicated from the desiccant outlet and to replenish concentrated liquid desiccant into the desiccant container via the desiccant inlet A regenerator connected to the desiccant inlet and the desiccant outlet of the container,
The dehumidifier is
A cooling element for cooling the liquid desiccant in the dehumidifier and / or the condensate in the regenerator by absorbing the latent heat of condensation of the liquid desiccant in the dehumidifier and / or the condensate in the regenerator, and
A heat sink to recover the heat of condensation,
It is characterized by providing.

In accordance with another aspect of the present invention, a method for removing moisture from air in an enclosure is provided,
The method
Sending the humid air in the enclosure to the air inlet of the vapor condenser of the dehumidifier connected to the desiccant container;
Pumping the liquid desiccant from the desiccant container through the spray nozzle to the vapor condenser of the dehumidifier to absorb water vapor from the humid air and warm the liquid desiccant, thereby dehumidifying The air exiting through the air outlet of the machine's steam condenser is more dry than the air entering the air inlet, the process;
Using a regenerator to remove moisture from the less concentrated liquid desiccant sent from the desiccant container and replenishing the desiccant container with the concentrated liquid desiccant;
Including
Cooling the liquid desiccant in the dehumidifier and / or the condensed water in the regenerator by absorbing the latent heat of condensation of the liquid desiccant in the dehumidifier and / or the condensed water in the regenerator; and
Recovering the heat of condensation by a heat sink;
It is characterized by.

  As will be explained below, the dehumidifier according to the present invention is an enthalpy system that is not adiabatic (ie, constant enthalpy) but, on the contrary, fluctuates.

  In some embodiments, the present invention cools the desiccant in the dehumidifier. Because, for example, cooling the desiccant to 15 ° C. (when the enclosure air is 20 ° C.) allows the desiccant to have 60% activity in the dehumidifier. The activity of the desiccant in the regenerator is approximately 55%, so that the temperature of the desiccant in the regenerator can only be 60 ° C. while the water temperature is kept down to 40 ° C. Can be removed. Furthermore, this makes it possible to use all common desiccants such as MgCl and CaCl, which is much cheaper and more expensive than LiCl and LiBr without the risk of crystallization.

  In order to understand the present invention and how it is actually implemented, embodiments will now be described by way of non-limiting example with reference to the accompanying drawings.

It is the schematic of the dehumidifier concerning different embodiment of this invention. It is the schematic of the dehumidifier concerning different embodiment of this invention. It is the schematic of the dehumidifier concerning different embodiment of this invention. It is the schematic of the dehumidifier concerning different embodiment of this invention. It is the schematic of the dehumidifier concerning different embodiment of this invention. It is a moisture meter figure useful for explaining operation of a dehumidifier.

  In the following description of some embodiments, identical parts that appear in more than one figure or in the same figure, or that share similar functionality, are referred to by the same reference numeral.

  FIG. 1 schematically shows a dehumidifier (10) for removing moisture from the air inside the enclosure (12), which is connected to a desiccant inlet (16) for adding concentrated liquid desiccant. And a desiccant container (14) inside the enclosure having a desiccant outlet (18) for removing less concentrated liquid desiccant. Similarly, the interior of the enclosure (12) has an air inlet (20) downstream of the dehumidifier vapor condenser (22) for containing moist air and discharges dry air to the enclosure (12). An air outlet (24) downstream of the steam condenser (22) of the dehumidifier is provided. The pump (26) pumps liquid desiccant from the desiccant container (14) via the spray nozzle (28) to the dehumidifier vapor condenser (22) to absorb water vapor from the moist air. To the desiccant outlet (18). In doing the above, the water vapor stops latent heat, which warms the liquid desiccant so that the air passing through the air outlet (24) is more dry than the air entering the air inlet (20). The regenerator (30) is used to remove moisture from the less concentrated liquid desiccant delivered from the desiccant outlet (18) and through the desiccant inlet (16) ( In order to replenish the liquid desiccant concentrated in 14), it is connected to the desiccant inlet (16) and the desiccant outlet (18) of the desiccant container (14). The cooling element (32) absorbs the latent heat of condensation of the liquid desiccant to cool the liquid desiccant before it reaches the vapor condenser (22) of the dehumidifier, and the desiccant outlet (18) Located between the dehumidifier vapor condenser (22), thereby reducing the temperature of the liquid desiccant in the dehumidifier vapor condenser (22). The latent heat of condensation is recovered by a heat sink (34) connected to the cooling element (32).

  In the embodiment shown in FIG. 1, the cooling element (32) is constituted by an evaporator (36) connected in series with a compressor (38), which cools freon heat from the liquid desiccant. Removed into a coolant or hydrofluorocarbon which is a chlorofluorocarbon such as (trademark) and directs the removed heat from the coolant to a condenser (40) in series with the compressor (38). Freon I. It is a trademark of du Pont de Nemours and Company. The expansion valve (42) controls the coolant flow rate into the evaporator (36), thereby controlling the superheat at the outlet of the evaporator (36). Although the condenser (40) is shown inside the enclosure, it may be equally good outside the enclosure.

  As described above, the function of the regenerator (30) is to remove moisture from the liquid desiccant that is not so concentrated and to replenish the desiccant container (14) with the concentrated liquid desiccant. The exact structure of the regenerator (30) is not a feature of the invention as long as it can perform this function. The regenerator (30) may be constructed in a manner similar to that employed in our US Pat.

  Thus, as an example, the regenerator (30) is shown as a closed-loop two-stage evaporator that includes an interconnected evaporator (44a) and condenser (44b), each with its respective container ((46a) ), (46b), respective air inlets (48a), (48b), and respective air outlets (50a), (50b). Container (46a) contains a desiccant and container (46b) contains water. The air outlet (50a) of the evaporator (44a) is connected to the air inlet (48b) of the condenser (44b) to form a closed loop, and the air outlet (50b) of the condenser (44b) forms a closed loop. For this purpose, it is connected to the inlet (48a) of the evaporator (44a). The diluted desiccant in the container (14) at an outside air temperature (for example, 20 ° C.) is sent to the desiccant container (46a) in the regenerator (30) by a pump. Since the regenerator (30) requires that the desiccant is at a high temperature (eg, 65 ° C.), the desiccant container (46a) of the regenerator (30) is a desiccant / desiccant heat exchanger. (52) is preferably connected to the desiccant container (14) of the dehumidifier (10) and the heat exchanger (52) receives the diluted desiccant flowing from the dehumidifier (10) to the regenerator (30). The heated and concentrated desiccant is cooled and flowed back from the regenerator (30) to the dehumidifier (10). The desiccant / air heat exchanger (54) connected to the heater (56) has a desiccant inlet (58) connected to the desiccant container (46a). The pump (60) feeds the desiccant from the desiccant container (46a) to the desiccant / air heat exchanger (54), which is spray nozzle through the desiccant outlet (62). The heated diluted desiccant is sent to the evaporator (44a) through (64a). The air entering the air inlet (48a) can be warmed in contact with the evaporator (44a) to retain more water absorbed from the diluted desiccant and thereby increase its concentration. The concentrated desiccant is returned to the container (14) of the dehumidifier (10) by a desiccant / desiccant heat exchanger (52). When heat is absorbed from the diluted desiccant, the air exiting from the air outlet (50a) of the evaporator (44a) is warmer than before and is humider than the air entering the air inlet (48a). is there. The wet warm air circulates through a closed loop to the air inlet (48b) of the condenser (44b), which condenses water from the air and sends the condensed water to the container (46b). The heat of condensation is recovered by a heat regeneration system (66) that serves as a heat sink (34) that receives hot water from the vessel (46b) by a pump (68) and spreads radially to the enclosure (12). This cools the water and then returns to the condenser (44b) via the spray nozzle (64b).

  FIG. 2 shows that the cooling element (32) removes heat from the desiccant in the vapor condenser (22) of the dehumidifier and into the chilled water (72) in a container (eg, aquifer or swimming pool (74)). Fig. 4 shows a second embodiment including a heat exchanger (70) for delivering removed heat. Cold water having a temperature of about 5 ° C. may be pumped into the heat exchanger (70) by the pump (76) and further transferred to the steam condenser (44b) in the regenerator (30). Here, the cold water may be further heated and returned to the aquifer or swimming pool (74) as hot water (78) at a temperature of about 35 ° C. for other applications such as heating.

  FIG. 3 shows a third embodiment of a hybrid system in which the cooling element (32) is effectively shared between the dehumidifier (10) and the regenerator (30). Thus, the regenerator including the evaporator (36) in series with the compressor (38) is connected between the container (14) of the dehumidifier (10) and the container (46a) of the regenerator (30) for liquid drying. Heat is removed from the agent to the coolant and then the removed heat is sent from the coolant to a condenser (40) in series with the compressor (38). The expansion valve (42) controls the amount of coolant entering the evaporator (36), thereby controlling overheating at the outlet of the evaporator (36). Although the condenser (40) is shown inside the enclosure (12), it may be equally good outside the enclosure. The condenser (40) is connected between the container (46a) of the regenerator (30) and the evaporator (44a). The evaporator (36) cools the desiccant in the dehumidifier vapor condenser (22) by removing the heat, which is then transferred to the condenser and transferred to the desiccant in the regenerator (30). . The heat sink (34) is realized by an aquifer or a swimming pool (74). Cold water (72) from the aquifer or swimming pool (74) is directed to the condenser (44b) to absorb moisture from the humid hot air reaching the air inlet (48b) of the condenser (44b). , Thereby drying the air. The condensed water is warmed by the latent heat of condensation, flows into the container (46b), and is returned from the container (46b) to the aquifer or swimming pool (74) as hot water (78) by the pump (76). Cold water (72) and hot water (78) may be stored in separate tanks.

  In the embodiment shown in FIGS. 1-3, the cooling element (32) cools the liquid desiccant in the vapor condenser (22) of the dehumidifier. This is because the cooler the liquid desiccant in the dehumidifier (22), the more efficiently it can absorb water vapor from the air in the enclosure (12).

  FIG. 4 shows that a cooling element (32) is connected between the vessel (46b) in the regenerator (30) and the condenser (44b) to remove heat from the liquid desiccant in the condenser (44b). 4 shows a fourth embodiment including an evaporator (36). The heat removed in this way is transferred by the compressor (38) to the condenser (40) connected between the vessel (46a) in the regenerator (30) and the evaporator (44a). Heat is removed from the condensed water and fed to the desiccant evaporator (44a). In this way, the water in the regenerator condenser is kept cold, which improves the regenerator effect. Although not shown in the figure, an additional heat pump may be connected to a dehumidifier (10) similar to the configuration shown in FIG. 1 to evaporate to remove heat from the desiccant vapor condenser (22). And a condenser for transferring the removed heat to the air in the enclosure (12).

  FIG. 5 shows a fifth embodiment in which the heat sink (34) is realized by an aquifer or swimming pool (74). Cold water (72) from the aquifer or swimming pool (74) is directed to the condenser (44b) to absorb moisture from the humid hot air reaching the air inlet (48b) of the condenser (44b). , Thereby drying the air. Air is condensed by the condenser (44b), and the cold condensed water flows into the container (46b) and is pumped from the container as hot water (78) back to the aquifer or swimming pool (74) by the pump (76). .

  In order to better evaluate the improvement of the variable enthalpy dehumidifier according to the present invention over the adiabatic (ie constant enthalpy) dehumidifier described in US Pat. The operation of the adiabatic dehumidifier will be discussed with reference to the moisture meter diagram shown in FIG. 6 which is a plot of desiccant activity for humidity variation conditions. In addition, the components of the adiabatic dehumidifier are also present in the variable enthalpy dehumidifier (10) shown in FIG. 1 and will be referred to with reference to FIG.

  Liquid desiccants are characterized by a low vapor pressure compared to the vapor pressure of water at the same temperature. The ratio of the vapor pressure of the desiccant to the water pressure at the same temperature is defined as “activity” α. Thus, for example, desiccant LiCl at a concentration of S = 25% is characterized by a vapor pressure with an activity of α = 50% at half the water pressure of water at the same temperature. When S = 40%, the activity α = 25%. At any concentration, the desiccant follows a relative humidity curve on the moisture meter diagram. For example, for lithium chloride (LiCl) having a salt concentration of 40%, the activity ratio is 20%. On the other hand, at a salt concentration of 30%, the activity ratio is about 40%. At a concentration of 20%, the activity ratio is 60%. At the same temperature, lithium chloride and lithium bromide remain liquid with activity α = 20%. However, common and inexpensive liquid desiccants such as CaCl and MgCl crystallize when their salt concentration corresponds to an activity of less than about 40%.

  Referring to the adiabatic dehumidifier disclosed in Patent Document 6 and the moisture meter diagram shown in FIG. 6, the air is air temperature of 20 ° C. marked 1 in FIG. 6 and the steam amount of 12 g / kg. And enters the steam condenser (22) of the adiabatic dehumidifier and exits at a temperature of 25 ° C. and a steam volume of 10 grams / kg. In other words, only 2 grams of water vapor per kg of air was removed from the air. This means that in an adiabatic dehumidifier, all of the latent heat is converted to sensible heat, but the dehumidification rate is only 2 grams of steam per kg of air. The interface of the liquid desiccant in this example remains at a vapor concentration of 9 g / kg and a relative humidity of 40% at T = 27.5 ° C. In this process, the desiccant collects 2 grams of water with 1 kg of air introduced into the dehumidifier. When applied to the dehumidifier (10) of FIG. 1 to maintain the concentration in a steady state, the regenerator (30) causes the cold desiccant of the steam condenser (22) of the dehumidifier shown in FIG. Water must be removed from the desiccant at the same rate that water vapor is collected.

  Assuming that the concentration of the liquid desiccant LiCl in the vapor condenser (22) is 30% with α = 40%, the concentration of the desiccant in the regenerator (30) is higher. For example, α = 35% and LiCl is 35%. In the regenerator (30), the low activity desiccant requires a high temperature desiccant in the evaporator (36) of FIG. 1 that evaporates the “dry steam” at high temperature and low vapor pressure. In order to be an effective condenser for dry steam, cold water must be introduced from the heat sink (34) to the water condenser (44b). However, if the water in the pump (66) is too cold, the heat sink (34) cannot transfer heat to the enclosure (12).

  It can be concluded that certain enthalpy dehumidifiers disclosed in U.S. Patent No. 6,057,059 cannot remove more than 2 grams of water per kg of air and require an expensive desiccant that does not crystallize at low activity. Good.

  Now, let's compare the operation of the dehumidifier (10) according to the present invention, where the desiccant is as effective as a dehumidifier with heat recovery while having an activity ratio of α = 50%.

  Thus, returning to the first embodiment shown in FIG. 1, improvements include cooling the desiccant in the dehumidifier (10) by the cooling element (32) and removing the heat removed from the desiccant into the atmosphere. Or due to telling for other needs.

  In the psychrometer diagram shown in FIG. 6, the desiccant interface follows a curve of 50% relative humidity and varies between 22 ° C. and 17 ° C. by the evaporator (36) of FIG. 1 or the evaporator (70) of FIG. Until cooled. The air follows an isotherm of vapor volume from 12 grams to 8.5 grams and reduces the humidity by 3.5 grams per kg compared to a maximum of 2 grams reduction in an adiabatic dehumidifier.

  The desiccant is heated by air vapor condenser (44b) from 17 ° C to 22 ° C. Therefore, compared to a 2 gram / kg reduction in steam in an adiabatic dehumidifier, the reduction in the amount of steam in the air leaving the variably enthalpy dehumidifier according to the present invention is 12 gram / kg of air. Since it comes out at 8.5 grams / kg, it is 3.5 grams / kg.

  Therefore, the variable enthalpy dehumidifier according to the present invention is more effective in removing water vapor from the air than the adiabatic dehumidifier.

  The air temperature is from 20 ° C. to 25 ° C. in an adiabatic dehumidifier compared to the constant temperature in this example or the slight temperature change of air in the variable enthalpy dehumidifier according to the invention, ie Increase by 5 ° C. Thus, in an adiabatic dehumidifier, all of the latent heat is converted to air heating, but most of the latent heat in the variable enthalpy dehumidifier is used to warm the cold desiccant.

  In addition, it should be noted that a circulation pump disposed in the system to advance to the regenerator can control the relationship between the diluted desiccant flowing into the regenerator and the concentrated desiccant flowing out of the regenerator. is there. Similarly, in order to improve the efficiency of the desiccant / air heat exchanger, the Reynolds number of the air inside the filled material used in the heat exchanger should preferably be less than 2000.

  It will be apparent to those skilled in the art that the present invention is not limited to the details of the illustrated embodiments described above. The scope of the present invention shall be determined only by the appended claims.

Claims (2)

A method of removing moisture from the air in an enclosure,
Sending humid air in the enclosure to an air inlet (20) of a dehumidifier (22) connected to a desiccant container (14);
Pumping the liquid desiccant from the desiccant container (14) through the spray nozzle (28) to the dehumidifier (22) to absorb water vapor from the humid air and warm the liquid desiccant. The air exiting through the air outlet (24) of the dehumidifier (22) is thereby more dry than the air entering the air inlet,
The regenerator (30) is used to remove moisture from the less concentrated liquid desiccant sent from the desiccant container (14), and the concentrated liquid desiccant is removed from the desiccant container (14). Replenishing process ,
By absorbing latent heat of condensation of the condensed water in the liquid desiccant and / or reproducing apparatus in the dehumidifier (22) (30), the liquid desiccant and / or reproducing apparatus in the dehumidifier (22) (30 ) The process of cooling the condensed water in
Recovering the heat of condensation by a heat sink (36); and
Removing the heat from the condensed water and sending the removed heat to a desiccant evaporator (44a) . For air passing through a desiccant / air heat exchanger, the Reynolds number is less than 2000,
The method according to claim 1 .

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