KR102580751B1 - Dehumidification system including heat exchanger - Google Patents

Abstract

The dehumidification system is divided into a dehumidification zone, a regeneration zone, and a purge zone, and rotates by a drive motor to adsorb moisture contained in the air flowing into the dehumidification zone, and then discharges the dehumidified low dew point air into the dry room; A primary external air precooler, a secondary external air precooler, and a second external air branched to the purge area among the external air discharged from the primary external air precooler and a heat exchanger for heat exchange between the circulating air introduced from the dry room. It includes a heat exchanger, a circulating air precooler that cools the circulating air discharged from the heat exchanger, and a reheat heater that heats the air that has passed through the purge section to a regeneration temperature and discharges it to the regeneration section.

Description

Dehumidification system including heat exchanger {DEHUMIDIFICATION SYSTEM INCLUDING HEAT EXCHANGER}

This disclosure relates to dehumidification systems.

The industrial low dew point dehumidification system is a facility that adjusts the humidity of the supplied air to maintain the indoor space where the production process takes place as a dry room with a low dew point. In battery production or the production of food and pharmaceutical products, these industrial low dew point dehumidification systems are used to reduce problems that may occur due to moisture.

Conventional industrial low dew point dehumidification systems use a rotor that absorbs moisture using silica gel, etc. to supply air suitable for the temperature and humidity required in the dry room. This is called dry dehumidification or desiccant dehumidification. Most of the air passing through the rotor is adjusted to the temperature and humidity required by the dry room and supplied to the dry room. Some of the air passing through the rotor is heated by the reheat heater and passes through the regeneration area of the rotor, removing moisture from the rotor. It is used to remove At this time, for low dew point dehumidification, air with low temperature and low absolute humidity must be introduced into the dehumidifying area of the rotor. Since the air cooled by the cooling coil flows into the dehumidifying area, the temperature and humidity flowing into the dehumidifying area must be adjusted. There is a limit to lowering it. In addition, to regenerate the rotor, the low temperature air that has passed through the dehumidification zone must be heated, so a lot of energy is required for rotor regeneration.

The present disclosure provides a heat exchanger for heat exchanging external air branched to a purge area and circulating air introduced from a dry room, and a dehumidification system including the same.

A dehumidification system according to an embodiment is divided into a dehumidification zone, a regeneration zone, and a purge zone, rotates by a drive motor, adsorbs moisture contained in the air flowing into the dehumidification zone, and then dries the dehumidified low dew point air. A rotor discharging to the room, a primary external air precooler for cooling the incoming external air, cooling a first part of external air branched to the dehumidification zone from the external air discharged from the primary external air precooler, and dehumidifying A secondary outside air precooler discharged to the zone, a heat exchanger for heat exchanging between the outside air discharged from the first outside air precooler, a second part of outside air branched to the purge section, and circulating air introduced from the dry room, It includes a circulating air precooler that cools the circulating air discharged from the heat exchanger, and a reheat heater that heats the air that has passed through the purge zone to a regeneration temperature and discharges it to the regeneration zone. The second portion of external air discharged from the secondary external air precooler and the circulating air discharged from the circulating air precooler are mixed in a mixing space, and the mixed air passes through the dehumidifying zone and is dehumidified, and then It is discharged into this room. The second portion of external air discharged from the heat exchanger passes through the purge zone, is heated by the reheat heater, and passes through the regeneration zone.

The heat exchanger may discharge the second portion of external air whose temperature has been increased through heat exchange to the purge area, and may discharge the circulating air whose temperature has been lowered through heat exchange into the mixing space.

The dehumidification system is disposed between a processor, the first outside air precooler, and the second outside air precooler, and adjusts the amount of outside air branched into the dehumidification zone and the purge zone under control of the processor. It may further include a regulator.

The dehumidification system may further include an air flow sensor that measures the amount of the second portion of external air flowing into the dehumidification zone, and an oxygen amount sensor that measures the amount of oxygen in the supply air supplied to the dry room.

The processor calculates the required amount of outside air to be introduced into the dehumidification zone based on the amount of the second partial outside air measured by the airflow sensor and the oxygen amount of the supply air measured by the oxygen amount sensor, The opening/closing rate of the air volume regulator can be controlled so that the required amount of external air is diverted to the dehumidification zone.

The dehumidification system may further include a path for bypassing some of the circulating air before flowing into the heat exchanger to the purge area, and a bypass regulator for controlling the air flow to the bypass path.

The processor changes the opening/closing ratio of the bypass controller when the amount of external air branched into the purge zone by the control of the air volume controller is insufficient to meet the standard, thereby controlling some of the circulating air to flow into the purge zone. You can.

A dehumidification system according to another embodiment is divided into a dehumidification zone, a regeneration zone, and a purge zone, rotates by a drive motor, adsorbs moisture contained in the air flowing into the dehumidification zone, and then dries the dehumidified low dew point air. A rotor discharging into the room, a first heat exchanger for heat-exchanging some of the external air branched into the purge area among the incoming external air, and the circulating air flowing in from the dry room, some of the external air discharged from the first heat exchanger, and A second heat exchanger that heat-exchanges the air discharged from the regeneration zone, a first outside air precooler that cools some of the outside air branched into the dehumidification zone among the inflow outside air, and circulating air discharged from the first heat exchanger. It includes a circulating air precooler that cools the air, and a reheat heater that heats the air that has passed through the purge section to a regeneration temperature and discharges it to the regeneration section. Some of the external air discharged from the first external air precooler and the circulating air discharged from the circulating air precooler are mixed in a mixing space, and the mixed air is dehumidified by passing through the dehumidifying zone and then discharged into the dry room. do. Some of the outside air discharged from the first heat exchanger exchanges heat in the second heat exchanger, passes through the purge zone, is heated by the reheat heater, and passes through the regeneration zone.

The dehumidification system may further include a second external air precooler disposed in front of the first external air precooler to cool the introduced external air. The introduced outside air is branched between the second outside air precooler and the first outside air precooler, and some of the outside air branched into the purge zone flows into the first heat exchanger and branches into the dehumidification zone. Some outside air may flow into the first outside air precooler.

The dehumidification system is disposed between a processor and the first outside air precooler and the second outside air precooler, and adjusts the amount of outside air branched into the dehumidification zone and the purge zone under control of the processor. It may further include a regulator.

The dehumidification system may further include an air flow sensor that measures the amount of external air flowing into the first external air precooler, and an oxygen amount sensor that measures the amount of oxygen in the supply air supplied to the dry room.

The processor calculates the required amount of outside air to be introduced into the dehumidification zone based on the amount of outside air measured by the air volume sensor and the oxygen amount of the supply air measured by the oxygen amount sensor, and the required amount of outside air is calculated from the dehumidification area. The opening/closing rate of the air volume regulator can be controlled to branch into zones.

The dehumidification system may further include a path for bypassing some of the circulating air before flowing into the first heat exchanger to the second heat exchanger, and a bypass regulator for controlling the air flow to the bypass path.

The processor changes the opening/closing ratio of the bypass controller when the amount of external air branched into the purge zone by the control of the air volume controller is insufficient to meet the standard, thereby controlling some of the circulating air to flow into the purge zone. You can.

The first heat exchanger may discharge some of the external air whose temperature has been increased through heat exchange to the second heat exchanger, and may discharge the circulating air whose temperature has been lowered through heat exchange into the mixing space. The second heat exchanger may discharge some of the external air whose temperature has been increased through heat exchange to the purge zone, and may discharge air discharged from the regeneration zone whose temperature has been lowered through heat exchange to the outside.

In the dehumidification system of the present disclosure, the outside air branched into the purge area of the rotor is heated through heat exchange with high-temperature circulating air and then flows into the purge area, so the reheat heater raises the air introduced from the purge area to the regeneration temperature. The energy used can be reduced.

In the dehumidifying system of the present disclosure, the temperature of the circulating air is lowered through heat exchange with low-temperature external air and then passes through the precooler, so the temperature of the circulating air is lowered compared to the case where it is cooled only by the precooler, and as a result, the temperature of the rotor is lowered. The temperature and humidity of the mixed air flowing into the dehumidification area can be lowered, so air with a lower dew point than before can be supplied to the dry room.

The dehumidifying system of the present disclosure can reduce the capacity of the precooler that cools external air and circulating air or reduce the energy used for cooling water compared to the case where a heat exchanger is not used.

Figure 1 is a typical single rotor dehumidifier.
2 to 9 are diagrams of a dehumidification system including a heat exchanger according to an embodiment.

Below, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts not related to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

Throughout the specification, when a part is said to “include” a certain element, this means that it may further include other elements rather than excluding other elements, unless specifically stated to the contrary. In addition, terms such as "... unit", "... unit", and "module" used in the specification refer to a unit that processes at least one function or operation, which may be implemented as hardware or software or a combination of hardware and software. there is.

Figure 1 is a typical single rotor dehumidifier.

Referring to Figure 1, the single rotor dehumidifier 10 includes a rotor 11, a precooler (PC) (12, 13), a reheating heater (14), and a fan (15, 16). , After Cooler (17), and After Heater (18). The rotor 11 has a dehumidifier attached, rotates by a drive motor, adsorbs moisture contained in the incoming air, and then discharges supply air (SA) into the dry room. The rotor 11 is divided into a dehumidification zone, a regeneration zone, and a purge zone.

Outdoor Air (OA) is cooled and dehumidified by the pre-cooler (PC) (12), and the circulating air (Return Air, RA) cooled by the pre-cooler (PC) (13) in the mixing chamber. ) is mixed with. Circulating air (RA) flows in from the dry room. The mixed air is a mixture of cooled, dehumidified outside air and low-humidity circulating air to create medium-humidity air.

The mixed air is introduced into the dehumidifying area of the rotor 11 by the fan 15. The supply air (SA) passing through the dehumidifying section of the rotor 11 passes through the aftercooler 17 and the afterheater 18, is adjusted to the temperature and humidity required for the dry room, and is then supplied to the dry room. At this time, because there is a lot of moisture contained in the mixed air, the amount of dehumidification that the rotor 11 must process may increase.

Some of the mixed air is used for rotor regeneration. Some of the mixed air passes through the purge section of the rotor 11, is heated to a high regeneration temperature by the reheat heater 14, then passes through the regeneration section of the rotor 11 and is discharged by the fan 16. Air, EA). Moisture attached to the rotor 11 is removed by the high temperature air flowing into the regeneration area.

Meanwhile, the air supplied to the dry room is greatly affected by the condition of the air flowing into the dehumidifying area of the rotor 11. Therefore, for low dew point dehumidification, air with low temperature and low absolute humidity must be introduced into the dehumidifying area of the rotor 11, but there is a limit to lowering the temperature and humidity of the external air and circulating air with the cooling coil. Additionally, in order to regenerate a rotor with a large amount of dehumidification, the reheat heater 14 must heat the mixed air to a high temperature, so a lot of energy is required for rotor regeneration.

In the following, a dehumidification system that is energy efficient and improves dehumidification performance will be described.

2 to 9 each show the configuration of a dehumidification system including a heat exchanger according to an embodiment.

Referring to Figure 2, the dehumidification system (100A) includes a rotor (110), an external air precooler (120, 121), a circulating air precooler (130), a reheat heater (140), a fan (150, 160), and an aftercooler. (170), and may include an afterheater (180). The dehumidification system 100A includes a heat exchanger 200 that exchanges heat between outside air (OA) branched to the purge area and circulating air (RA) introduced from the dry room. The dehumidification system 100A may include a processor 300 that controls internal devices. The dehumidification system 100A may further include a temperature sensor (not shown) that measures air temperature. Since the air piping of the dehumidification system 100A can be designed in various ways, the description will focus on air flow.

In the explanation, it is assumed that the outside air (OA) is cooled by the first outside air precooler 120 and the second outside air precooler 121, but depending on the temperature of the outside air, the outside air is cooled by the first outside air precooler. It can be implemented so that it does not pass through 120, or it can be implemented so that it does not cool the primary external air precooler 120, that is, it passes through the primary external air precooler that is not driven.

When the temperature of the circulating air introduced from the dry room (e.g., 23°C) is higher than that of the external air cooled by the primary external air pre-cooler 120, the primary external air is pre-cooled in the heat exchanger 200. After being cooled by the cooler 120, some of the branched outside air and the circulating air introduced from the dry room exchange heat. The heat exchanger 200 discharges external air whose temperature has increased and circulated air whose temperature has decreased.

The rotor 110 has a dehumidifying agent attached to it, rotates by a drive motor, adsorbs moisture contained in the incoming air, and then discharges the dehumidified air. The rotor 110 is divided into a dehumidification zone 111, a purge zone 113, and a regeneration zone 115, and the rotor rotation area may rotate so that it passes through the dehumidification zone, the regeneration zone, and the purge zone in that order.

The outside air (OA) is cooled and dehumidified by the primary outside air precooler 120, and then branches into a purge area and a dehumidification area before flowing into the secondary outside air precooler 121. Some of the external air branched into the purge area passes through the heat exchanger 200, its temperature increases due to heat exchange with the circulating air (RA), and flows into the purge area 113 of the rotor 110.

The air that has passed through the purge section 113 of the rotor 110 is heated to a high regeneration temperature by the reheat heater 140, then passes through the regeneration section 115 of the rotor 110 and is discharged by the fan 160. It becomes (EA). Moisture attached to the rotor 110 is removed by the high temperature air introduced into the regeneration area. The air flowing into the purge area 113 travels in the opposite direction to the air (regeneration air) heated by the reheat heater 140, exchanges heat with the regeneration air, and is discharged from the purge area 113 with an increased temperature. . At this time, the external air branched into the purge area 113 of the rotor 110 increases in temperature through heat exchange with the circulating air and then flows into the purge area, so the reheat heater 140 removes the air introduced from the purge area 113. The energy used to raise the temperature to the regeneration temperature can be reduced.

The circulating air (RA) introduced from the dry room passes through the heat exchanger 200, its temperature is lowered, and then passes through the circulating air precooler 130. The circulating air precooler 130 can cool the circulating air to a temperature similar to that of external air that has passed through the secondary external air precooler 121.

Meanwhile, most of the external air branched into the dehumidification zone flows into the secondary external air precooler (121) and is cooled and dehumidified, and the external air that passes through the secondary external air precooler (121) is transferred to the circulating air precooler (130). It is mixed with the circulating air that has passed through. The cooled, dehumidified outside air and the cooled circulating air are mixed in the mixing space, becoming mixed air of low temperature and low humidity.

The mixed air is introduced into the dehumidifying area 111 of the rotor 110 by the fan 150. The dehumidifying area 111 of the rotor 110 adsorbs moisture in the incoming mixed air and discharges low dew point supply air (SA). The supply air (SA) discharged from the dehumidifying area 111 passes through the aftercooler 170 and the afterheater 180, is adjusted to the temperature and humidity required for the dry room, and is then supplied to the dry room.

In this way, the mixed air flowing into the dehumidification zone 111 includes circulating air (RA) cooled as it passes through the heat exchanger 200, so the rotor 110 has a mixture of lower temperature and humidity than the prior art of FIG. 1. Since the air needs to be dehumidified, the dehumidification load is reduced, and air with a lower dew point than that of the prior art can be supplied to the dry room.

Referring to FIG. 3 , the dehumidification system 100B may further include an air volume controller 190 compared to the dehumidification system 100A of FIG. 2 . The wind volume controller 190 can be implemented in various ways using dampers, valves, etc. The air volume controller 190 is disposed between the primary external air precooler 120 and the secondary external air precooler 121, and is controlled by the processor 300 to operate the dehumidifying zone 111 and the purge zone 113. You can control the amount of external air that branches out.

The dehumidification system 100B may further include an air volume sensor 400 and an oxygen amount sensor 410.

The air volume sensor 400 is a sensor that measures the amount of external air flowing into the dehumidification zone 111, and can measure the amount of air flowing at any point between the point after branching to the air volume controller 190 and the point before mixing of the mixed air. there is.

The oxygen amount sensor 410 measures the oxygen amount of supply air (SA) supplied to the dry room.

The processor 300 acquires the amount of external air flowing into the dehumidification zone 111 measured by the air volume sensor 400 and the oxygen amount of the supplied air (SA) measured by the oxygen amount sensor 410. The processor 300 calculates the required amount of external air to be introduced into the dehumidification zone 111 so that the oxygen content of the supply air (SA) is greater than the standard value set in the dry room, and diverts the required amount of external air to the dehumidification zone 111. The opening/closing rate of the wind volume controller 190 can be controlled.

The processor 300 obtains the dew point temperature of the circulating air (RA), calculates the amount of external air required for heat exchange in the heat exchanger 200 according to the dew point temperature of the circulating air (RA), and calculates the amount of external air required for heat exchange in the purge area. The opening/closing rate of the air volume controller 190 can be controlled to branch to (113).

Referring to FIG. 4, the dehumidification system 100C bypasses some of the circulating air (RA) before flowing into the heat exchanger 200 from the dehumidification system 100A of FIG. 2 to the purge area 113 of the rotor 110. Additional routes may be included. Bypass regulator 191 may regulate air flow to the bypass path and may be controlled by processor 300. The bypass regulator 191 can be implemented in various ways using dampers, valves, etc.

When the amount of external air flowing into the purge area 113 of the rotor 110 is insufficient below the standard, the processor 300 changes the opening/closing ratio of the bypass controller 191 to allow some of the circulating air (RA) to flow into the purge area ( 113) can be controlled to flow in.

The processor 300 can directly supply circulating air (RA) of high temperature and low humidity to the purge area 113 through the bypass controller 191. Through this, the temperature of the air flowing into the purge area 113 can be increased and the humidity can be lowered, thereby reducing the energy consumed by the reheat heater 140 to raise the air passing through the purge area to the regeneration temperature.

Referring to FIG. 5, the dehumidification system 100D bypasses some of the circulating air (RA) before flowing into the heat exchanger 200 from the dehumidification system 100B of FIG. 3 to the purge area 113 of the rotor 110. Additional routes may be included. Bypass regulator 191 may regulate air flow to the bypass path and may be controlled by processor 300. The bypass regulator 191 can be implemented in various ways using dampers, valves, etc.

The processor 300 calculates the required amount of external air to be introduced into the dehumidification zone 111 so that the oxygen content of the supply air (SA) is greater than the standard value set in the dry room, and diverts the required amount of external air to the dehumidification zone 111. The opening/closing rate of the wind volume controller 190 can be controlled. At this time, when the amount of external air branched into the dehumidification zone 111 increases, the amount of external air branched into the purge area 113 decreases. At this time, the processor 300 can control the opening/closing rate of the bypass controller 191 to allow some circulating air (RA) to flow into the purge area 113. Through this, even if the amount of branching of external air varies, the amount of air flowing into the purge area 113 and the amount of air flowing into the dehumidification area 111 can be maintained constant.

When some circulating air (RA) of high temperature and low humidity flows into the purge area (113) through the bypass controller (191), the reheat heater (140) consumes the air that has passed through the purge area to raise the regeneration temperature. The energy generated can be reduced.

Referring to FIG. 6 , the dehumidification system 100E may further include an additional heat exchanger 210 in the dehumidification system 100A of FIG. 2 . The additional heat exchanger 210 exchanges heat between the air flowing into the purge section 113 of the rotor 110 and the air passing through the regeneration section 115 of the rotor 110. The temperature of the high temperature air passing through the regeneration zone 115 is lowered through heat exchange, and the temperature of the air flowing into the purge zone 113 is increased through heat exchange.

The temperature of some of the outside air (OA) branched into the purge area increases as it passes through the heat exchanger 200, and its temperature increases further as it passes through the additional heat exchanger 210. Accordingly, the energy consumed by the reheat heater 140 to raise the air passing through the purge zone to the regeneration temperature can be reduced.

The air that has passed through the purge section is heated to the regeneration temperature by the reheat heater 140 and passes through the regeneration section 115. The air passing through the regeneration zone 115 maintains a temperature lower than the regeneration temperature but significantly higher, and the temperature decreases as it passes through the additional heat exchanger 210.

Meanwhile, the additional heat exchanger 210 may also be added to the dehumidification system 100B of FIG. 3, the dehumidification system 100C of FIG. 4, and the dehumidification system 100D of FIG. 5.

Referring to FIG. 7, the dehumidification system 100F is a dehumidification system 100B of FIG. 3 in which an additional heat exchanger 210 is added.

Referring to FIG. 8, the dehumidification system 100G is a dehumidification system 100C of FIG. 4 with an additional heat exchanger 210 added thereto.

Referring to FIG. 9, the dehumidification system 100H is a dehumidification system 100D of FIG. 5 with an additional heat exchanger 210 added thereto.

As such, in the dehumidification system of the present disclosure, the outside air branched into the purge area of the rotor is heated through heat exchange with high-temperature circulating air and then flows into the purge area, so the reheat heater regenerates the air introduced from the purge area. The energy used to raise temperature can be reduced.

In the dehumidifying system of the present disclosure, the temperature of the circulating air is lowered through heat exchange with low-temperature external air and then passes through the precooler, so the temperature of the circulating air is lowered compared to the case where it is cooled only by the precooler, and as a result, the temperature of the rotor is lowered. The temperature and humidity of the mixed air flowing into the dehumidification area can be lowered, so air with a lower dew point than before can be supplied to the dry room.

The dehumidifying system of the present disclosure can reduce the capacity of the precooler that cools external air and circulating air or reduce the energy used for cooling water compared to the case where a heat exchanger is not used.

The embodiments of the present invention described above are not only implemented through devices and methods, but can also be implemented through programs that implement functions corresponding to the configurations of the embodiments of the present invention or recording media on which the programs are recorded.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims are also possible. It falls within the scope of rights.

Claims (15)

A rotor that is divided into a dehumidification zone, a regeneration zone, and a purge zone, and rotates by a drive motor to adsorb moisture contained in the air flowing into the dehumidification zone, and then discharges the dehumidified low dew point air into the dry room;
Primary external air precooler that cools the incoming external air,
A secondary outside air precooler that cools a first portion of outside air branched to the dehumidification zone from among the outside air discharged from the first outside air precooler and discharges it to the dehumidification zone;
A heat exchanger that exchanges heat between the external air discharged from the first external air precooler and a second part of external air branched into the purge area and the circulating air introduced from the dry room;
A circulating air precooler that cools the circulating air discharged from the heat exchanger, and
It includes a reheat heater that heats the air passing through the purge zone to a regeneration temperature and discharges it to the regeneration zone,
The second portion of external air discharged from the secondary external air precooler and the circulating air discharged from the circulating air precooler are mixed in a mixing space, and the mixed air passes through the dehumidifying zone and is dehumidified, and then It is discharged into this room,
The second portion of external air discharged from the heat exchanger passes through the purge zone, is heated by the reheat heater, and passes through the regeneration zone. In paragraph 1:
The heat exchanger is
A dehumidifying system that discharges the second portion of external air whose temperature has been increased through heat exchange into the purge area, and discharges the circulating air whose temperature has been lowered through heat exchange into the mixing space. In paragraph 1:
processor, and
An air volume controller disposed between the first outside air precooler and the second outside air precooler and controlling the amount of outside air branched into the dehumidification zone and the purge zone under the control of the processor.
A dehumidifying system further comprising: In paragraph 3,
An air volume sensor that measures the amount of the second portion of external air flowing into the dehumidification zone, and
A dehumidifying system further comprising an oxygen amount sensor that measures the amount of oxygen in the supply air supplied to the dry room. In paragraph 4,
The processor calculates the required amount of outside air to be introduced into the dehumidification zone based on the amount of the second partial outside air measured by the airflow sensor and the oxygen amount of the supply air measured by the oxygen amount sensor, A dehumidification system that controls the opening/closing rate of the air volume regulator so that the required amount of external air is diverted to the dehumidification zone. In paragraph 3,
A dehumidifying system further comprising a path for bypassing some of the circulating air before flowing into the heat exchanger to the purge area, and a bypass regulator for controlling the air flow to the bypass path. In paragraph 6:
The processor,
A dehumidifying system that controls the flow of some of the circulating air into the purge zone by changing the opening/closing rate of the bypass controller when the amount of external air branched into the purge zone by control of the air volume controller is insufficient. A rotor that is divided into a dehumidification zone, a regeneration zone, and a purge zone, and rotates by a drive motor to adsorb moisture contained in the air flowing into the dehumidification zone, and then discharges the dehumidified low dew point air into the dry room;
A first heat exchanger that exchanges heat between some of the incoming outside air branched into the purge area and the circulating air flowing in from the dry room;
A second heat exchanger for heat-exchanging the portion of external air discharged from the first heat exchanger and the air discharged from the regeneration zone,
A first outside air precooler that cools some of the outside air branched into the dehumidification zone from the inflow outside air,
A circulating air precooler that cools the circulating air discharged from the first heat exchanger, and
It includes a reheat heater that heats the air passing through the purge zone to a regeneration temperature and discharges it to the regeneration zone,
Some of the external air discharged from the first external air precooler and the circulating air discharged from the circulating air precooler are mixed in a mixing space, and the mixed air is dehumidified by passing through the dehumidifying zone and then discharged into the dry room. And,,
A dehumidifying system wherein some of the outside air discharged from the first heat exchanger exchanges heat in the second heat exchanger, passes through the purge zone, is heated by the reheat heater, and passes through the regeneration zone. In paragraph 8:
It further includes a second external air precooler disposed in front of the first external air precooler to cool the introduced external air,
The introduced outside air is branched between the second outside air precooler and the first outside air precooler, and some of the outside air branched into the purge zone flows into the first heat exchanger and branches into the dehumidification zone. A dehumidifying system in which some outside air flows into the first outside air precooler. In paragraph 9:
processor, and
An air volume controller disposed between the first outside air precooler and the second outside air precooler and controlling the amount of outside air branched into the dehumidification zone and the purge zone under the control of the processor.
A dehumidifying system further comprising: In paragraph 10:
An air volume sensor that measures the amount of outside air flowing into the first outside air precooler, and
A dehumidifying system further comprising an oxygen amount sensor that measures the amount of oxygen in the supply air supplied to the dry room. In paragraph 11:
The processor calculates the required amount of outside air to be introduced into the dehumidification zone based on the amount of outside air measured by the air volume sensor and the oxygen amount of the supply air measured by the oxygen amount sensor, and the required amount of outside air is calculated from the dehumidification area. A dehumidifying system that controls the opening/closing rate of the air volume regulator to branch into zones. In paragraph 10:
A dehumidifying system further comprising a path for bypassing some of the circulating air before flowing into the first heat exchanger to the second heat exchanger, and a bypass regulator for controlling the air flow to the bypass path. In paragraph 13:
The processor,
A dehumidifying system that controls the flow of some of the circulating air into the purge zone by changing the opening/closing rate of the bypass controller when the amount of external air branched into the purge zone by control of the air volume controller is insufficient. In paragraph 8:
The first heat exchanger is
Some of the external air whose temperature has been raised through heat exchange is discharged to the second heat exchanger, and the circulating air whose temperature has been lowered through heat exchange is discharged into the mixing space,
The second heat exchanger is
A dehumidifying system that discharges some of the external air whose temperature has been raised through heat exchange to the purge area, and air discharged from the regeneration area whose temperature has been lowered through heat exchange to the outside.