JP2024040568A - Cold water supply unit with compressed air dehumidifier - Google Patents

Abstract

An object of the present invention is to respond to external environmental conditions so that energy consumption can be reduced through interaction in a compressed air dehumidifier 20 and a cold water supply device 30 that commonly use the cooling effect of cooling water supplied from a cooling water source 10. The two operations are linked and controlled rationally and optimally.
SOLUTION: The compressed air dehumidifier 20 includes a cooling water pipe 25 for cooling compressed air, and a cold water supply device 30 supplies cold water to a cooled water supply section 80, and a reheat flow path 50a is provided. The compressed air reheater 50, the cooling water piping 35 for cooling the cold water, the cooling water piping 65 for cooling the pump motor, the cold water bypass piping 45 between the cold water outlet piping 44 and the cold water return piping 42, A first on-off valve 36 that is a water on-off valve, a second on-off valve 66 that opens and closes the pipe of the cooling water pipe 65 for cooling the pump motor, and a third on-off valve that opens and closes the pipe of the cold water bypass pipe 45. It includes a valve 46 and a fourth on-off valve 26 that opens and closes the pipe line of the cooling water pipe 25 for cooling compressed air.
[Selection diagram] Figure 1

Description

The present invention relates to a cold water supply device unit that includes a compressed air dehumidifier and a cold water supply device that commonly use the cooling effect of cooling water supplied from a cooling water source.

Conventional compressed air dehumidification equipment consists of an inlet that introduces compressed air, a cooling section that cools the compressed air introduced from the inlet and dehumidifies the compressed air by condensing moisture in the compressed air, and a cooling section that dehumidifies the compressed air. a dehumidifier main body having an exhaust port for exhausting compressed air dehumidified in In a compressed air dehumidifier equipped with a cooling circuit that has a valve and circulates refrigerant in the order of an evaporator, a compressor, a condenser, and an expansion valve, the compressed air exhausted from the exhaust port is used to utilize the heat radiation of the cooling circuit. The applicant has proposed a reheater (see Patent Document 1) that is equipped with a reheater for heating.

In addition, conventional chilled water supply devices supply chilled water, which is cooled by cooling water supplied from a cooling water source (primary chilled water supply device) via a chilled water heat exchanger, to a chilled water supply section (cooled object). A cold water tank (tank) in which the cold water cooled by the cold water heat exchanger is stored, and a cold water pressure pump installed to forcefully transport the cold water stored in the cold water tank (tank). (see Patent Document 2) has been disclosed.

Conventionally, there has been no system in which both a compressed air dehumidifying device and a cold water supply device are arranged in one casing or as one package to form a unit, thereby configuring a cold water supply device with a compressed air dehumidifying device. For example, in production factories that manufacture precision products these days, machine tools are cooled with chillers to maintain a predetermined temperature, and compressed air adjusted to the required temperature and humidity is supplied to machine tools. This enables highly accurate machining. For this reason, both the compressed air dehumidification device and the cold water supply device are installed in the same production factory.

Japanese Patent Application Publication No. 2011-005374 (page 1) JP-A-5-259676 (Figure 1)

The problem to be solved regarding a cold water supply device unit equipped with a compressed air dehumidifier is that the compressed air dehumidifier and the cold water supply device commonly use the cooling effect of cooling water supplied from a cooling water source. Conventionally, both have been provided separately, and it has not been proposed to link the operations of the two in response to external environmental conditions and to rationally and optimally control them.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a compressed air dehumidifying device and a chilled water supply device that use cooling water supplied from a cooling water source in common, so that energy consumption can be reduced through interaction. It is an object of the present invention to provide a cold water supply device unit equipped with a compressed air dehumidifying device whose operations can be rationally and optimally controlled by correlating the operations of both devices.

The present invention includes the following configuration to achieve the above object.
According to one form of a cold water supply device unit equipped with a compressed air dehumidifier according to the present invention, the pressure vessel is provided with a compressed air inlet through which compressed air is introduced and a compressed air outlet through which dehumidified compressed air is discharged. A device casing, and a compressed air conduit through which cooling water supplied from a cooling water source flows inside the device casing, and arranged to cool the compressed air and cause moisture in the compressed air to condense. a compressed air dehumidifier equipped with a cooling water pipe for cooling; and a compressed air dehumidifier equipped with a cooling water supply unit configured to supply the cold water cooled by the cooling water supplied from the cooling water source via the cold water heat exchanger to the chilled water supply section. A compressed air supply device comprising: a cold water tank in which cold water cooled by a heat exchanger is stored; and a cold water supply device equipped with a cold water pressure pump installed to pump the cold water stored in the cold water tank. A cold water supply unit including a dehumidifying device, the unit being connected to a compressed air outlet flow path extending from the compressed air outlet, heating the compressed air by exhaust heat generated from the pump motor of the cold water pressure pump. a compressed air reheater provided with a reheating passage arranged adjacent to the pump motor so as to reheat the compressed air cooled by the compressed air dehumidifier; and the cooling water source. A cooling water piping for circulating the cooling water supplied from the cooling water to the cold water heat exchanger, and a cooling water pipe supplied from the cooling water source so as to cool exhaust heat generated from the pump motor of the cold water pressure pump. A cooling water pipe for cooling the pump motor, which is a pipe for circulating cooling water and has a part arranged adjacent to the pump motor, and a cooling water pipe connected to a cold water discharge port of the cold water pressure pump to supply cold water to the target surface. A cold water bypass flow path is formed by connecting a cold water outlet pipe that supplies the cold water to the cold water supply section and a cold water return pipe that is connected to return the cold water to the cold water tank when it is supplied to the chilled water supply section. a first on-off valve that is a cooling water on-off valve that opens and closes a pipe line of the cooling water pipe for cooling the pump motor; a second on-off valve, a third on-off valve that is a bypass on-off valve that opens and closes the pipe line of the cold water bypass piping, and a fourth on-off valve that opens and closes the pipe line of the cooling water pipe for cooling the compressed air. Equipped with.

Moreover, according to one form of a cold water supply device unit equipped with a compressed air dehumidifier according to the present invention, the first on-off valve, the second on-off valve, the third on-off valve, and the fourth on-off valve Each opening/closing valve of the valve may be provided with a flow control valve, and may be characterized in that it includes a control device for controlling the flow control valve.

Moreover, according to one form of a cold water supply device unit equipped with a compressed air dehumidifier according to the present invention, a plurality of control modes corresponding to seasons are stored in a storage device of the control device as a control program for the control device. It can be characterized by being present.

Further, according to one embodiment of a cold water supply device unit equipped with a compressed air dehumidifier according to the present invention, in the control mode, the first on-off valve is set to a low level as a mode when the temperature of the cooling water decreases. a winter mode in which the pump motor is variably operated by opening the opening/closing valve at a low opening or intermittently, closing the second opening/closing valve, opening the third opening/closing valve at a low opening or opening, and opening the fourth opening/closing valve intermittently; In addition, as a mode when the temperature of the cooling water rises, the first on-off valve is fully opened, the second on-off valve is closed, the third on-off valve is closed, and the fourth on-off valve is closed. The pump motor may be characterized by having a summer mode in which the pump motor is opened and the pump motor is variably operated.

Further, according to one embodiment of the cold water supply device unit including the compressed air dehumidifier according to the present invention, in addition to the winter mode and the summer mode, the temperature of the cooling water is set in the mode between winter and summer. a spring/autumn mode in which the first on-off valve is variably opened, the second on-off valve is intermittently opened, the third on-off valve is variably opened, the fourth on-off valve is opened, and the pump motor is variably operated; It can be characterized by comprising:

Moreover, according to one form of a cold water supply device unit equipped with a compressed air dehumidification device according to the present invention, the compressed air reheater is provided in a form in which the reheat flow path surrounds the pump motor. In addition, the reheater main body portion may be provided in a branched form with a plurality of heat exchange branch pipes.

According to the cold water supply device unit equipped with the compressed air dehumidifier according to the present invention, energy is consumed due to interaction in the compressed air dehumidifier and the cold water supply device that commonly use the cooling action of the cooling water supplied from the cooling water source. This has a particularly advantageous effect in that both operations can be linked in response to external environmental conditions and controlled rationally and optimally so as to reduce the amount of noise.

1 is a system configuration diagram schematically showing an example of a cold water supply unit including a compressed air dehumidifier according to the present invention. FIG. 1 is a schematic vertical cross-sectional view from the front side schematically illustrating a part of a compressed air reheater and a cold water supply device that are constituent elements of a cold water supply device unit equipped with a compressed air dehumidification device according to the present invention. be. FIG. 3 is a schematic horizontal (transverse) cross-sectional view of the compressed air reheater shown in FIG. 2 when viewed from the top side. 3 is a schematic vertical cross-sectional view seen from the right side of FIG. 2. FIG. FIG. 2 is a perspective view showing an example of a cold water supply device unit including a compressed air dehumidifying device according to the present invention, in which a cooling water pipe for cooling a pump motor is not installed. 6 is a perspective view seen from the right side of FIG. 5. FIG. 6 is a perspective view seen from the back side and right side of FIG. 5. FIG. FIG. 6 is a perspective view showing a compressed air reheater and a cold water pressure pump, which are essential parts of the embodiment shown in FIG. 5, as seen from a side where a reheater exhaust fan and an inspection panel are provided. FIG. 6 is a perspective view showing a compressed air reheater and a cold water pressure pump, which are main parts of the embodiment shown in FIG. 5, as viewed from the side where an inspection panel and an intake port are provided. FIG. 6 is an exploded perspective view showing a compressed air reheater and a cold water pressure pump, which are main parts of the embodiment shown in FIG. 5. FIG. FIG. 9 is a perspective view showing the reheater main body and the cold water pressure pump in the state of the embodiment shown in FIG. 8 with the built-in box removed. FIG. 10 is a perspective view showing the reheater main body and the cold water pressure pump from the state of the embodiment shown in FIG. 9 with the built-in box removed. FIG. 13 is a perspective view of the embodiment shown in FIG. 11 or 12 as seen from the top side. FIG. 2 is a chart diagram illustrating a heat amount distribution generated by three heat exchangers (a reheater, a primary heat exchanger, and a secondary heat exchanger) corresponding to the configuration example shown in FIG. 1. FIG.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a cold water supply unit equipped with a compressed air dehumidifier related to the present invention will be described in detail based on the accompanying drawings (FIGS. 1 to 14).

A cold water supply device unit including a compressed air dehumidifier according to the present invention is a unit in which a compressed air dehumidifier 20 that commonly uses the cooling action of a cooling water source 10 and a cold water supply device 30 as a chiller are assembled into one package, for example. The structure is designed to achieve compactness by reducing the installation floor area of equipment and equipment, and to obtain the benefits of compounding, such as reducing energy consumption through interaction. Examples of the cooling water source 10 include a coolant-type cooling device (outside air heat absorption or outside air heat radiation type cooling tower) that cools circulating water by using the heat of vaporization of water, and a cooling tower that cools circulating water by using a refrigeration cycle. Examples include refrigeration cycle cooling equipment that cools the water used in water, and equipment that uses natural water resources such as groundwater. Furthermore, the number of cooling water sources 10 is not limited to one, and may be composed of a plurality of cooling water sources.

The compressed air dehumidification device 20 according to the present invention includes a device housing 23 as a pressure vessel provided with a compressed air inlet 21 through which compressed air is introduced and a compressed air outlet 22 through which dehumidified compressed air is discharged; A cooling system for cooling compressed air, which is a conduit through which cooling water supplied from the cooling water source 10 flows inside the device housing 23, and is arranged to cool the compressed air and cause moisture in the compressed air to condense. A water pipe 25 is provided.

In the compressed air dehumidifying device 20 of this embodiment, as shown in FIG. (AIR IN) compressed air is primarily cooled in a built-in reheater section 27 and secondarily cooled in a water-cooled cooling section 28. Further, the built-in reheater section 27 can reheat compressed air whose dew point (DP) has been lowered by cooling it in the water-cooled cooling section 28, thereby lowering its relative humidity (RH). Note that this reheating also has the effect of preventing recondensation and increasing the amount of air.

That is, this built-in reheater section 27 includes a primary side compressed air flow path 27a for primarily cooling the compressed air introduced from the compressed air inlet 21 and distributing it to the water-cooled cooling section 28; Secondary side compressed air is provided so as to intersect with the side compressed air flow path 27a for heat exchange, and to reheat the compressed air cooled by the water-cooled cooling unit 28 and to flow it to the compressed air outlet 22. A flow path 27b is provided.

Further, in the water-cooled cooling unit 28 of this embodiment, the folded end portion 25a of the cooling water pipe 25 for cooling compressed air, which is a part of the cooling water pipe 25 for cooling compressed air and serves as a heat exchanger, is a portion of the cooling water pipe 25 for cooling compressed air. Built-in. Heat exchange fins 25b are attached to the cooling water pipe 25 for cooling the compressed air disposed in the water-cooled cooling unit 28 so as to improve the efficiency of heat exchange. According to the cooling water piping 25 for cooling compressed air, by circulating the cooling water supplied from the cooling water source 10 inside the device housing 23, the introduced compressed air is cooled and the amount of water in the compressed air is It can dehumidify water by condensing it and lower its dew point.

The condensed water (drain water) generated by condensation in the water-cooled cooling unit 28 is drained from the drain outlet 29b via the drain pipe 29 connected to the device housing 23 and the drain opening/closing valve 29a. It is provided. Further, the communication portion 23a provided at one end side of the device housing 23 is provided in a flow path space for communicating the compressed air water cooling flow path 28a of the water cooling type cooling unit 28 and the secondary side compressed air flow path 27b. It has become. Further, the outlet communication section 23b provided on the other end side of the device housing 23 serves as a flow path space for communicating the secondary compressed air flow path 27b and the compressed air outlet 22.

The cold water supply device 30 according to the present invention is configured to provide a cold water heat exchanger so as to supply cold water, which is cooled by the cooling water supplied from the cooling water source 10 via the cold water heat exchanger 34, to the chilled water supply section 80. A cold water tank 40 in which the cold water cooled by the container 34 is stored, and a cold water pressure pump installed to forcefully transport the cold water in the cold water tank 40 (see the thick black line arrow shown in FIG. 2). 31. As shown in FIG. 2, the cold water pressure pump 31 is installed so that the suction port 31a enters the cold water 100 stored in the cold water tank 40. In this embodiment, a cold water circulation channel is provided so that the cold water supplied to the chilled water supply section 80 for water cooling flows through the cold water heat exchanger 34, is cooled, and is returned to the cold water tank 40. The configuration is such that cold water can be circulated by operating the cold water pressure pump 31.

According to the present invention, the compressed air is heated by exhaust heat generated from the pump motor 32 of the cold water pressure pump 31, which is connected to the compressed air outlet passage 24 extending from the compressed air outlet 22. In order to reheat the compressed air cooled by the compressed air dehumidifier 20, the compressed air reheater 50 is provided with a reheat flow passage 50a arranged adjacent to the pump motor 32. The compressed air reheated by the compressed air reheater 50 is discharged (AIR OUT) from the product compressed air outlet 55 as product compressed air. Furthermore, in the compressed air reheater 50, drain water is generated by cooling the exhaust heat of the pump motor 2. This drain water is discharged to the outside from the lower part of the built-in box 70, which will be described later, through a channel (not shown).

According to the present invention, the compressed air dehumidifier 20 and the cold water supply device 30, which share the cooling effect of the cooling water supplied from the cooling water source 10, are arranged in a rational manner so that energy consumption can be reduced through interaction. It can be incorporated into a unit. That is, the exhaust heat of the pump motor 32 of the cold water pressure pump 31 can be used as heating energy to reheat the compressed air that has been dehumidified by the compressed air dehumidifier 20, and no other energy source is required. Energy consumption can be reduced. Furthermore, the pump motor 32 is also cooled by the dehumidified compressed air absorbing the energy of the exhaust heat, so that the exhaust heat can be appropriately processed. That is, in the present invention, it has been found that the amount of heat of the exhaust heat of the pump motor 32 of the cold water pressure pump 31 is appropriately balanced as the amount of heat for reheating the compressed air discharged from the compressed air dehumidifier 20. It's being used.

In addition, in the compressed air reheater 50 of this embodiment, the reheat flow path 50a is provided in a form that surrounds the pump motor 32, and is also provided in a form that is branched by a plurality of heat exchange branch pipes 52. (See FIGS. 1 to 4, 10 to 13, etc.).

By providing the reheater main body part 51 in this way, it is possible to promote heat conduction for the compressed air to absorb heat, and to efficiently transfer the exhaust heat of the pump motor 32 to the compressed air. Reheating can be performed efficiently. Furthermore, since the heat exchange branch pipe 52 is provided as a spiral tube, the surface area of the heat exchange branch pipe 52 can be increased, and the heat conduction efficiency can be further improved. The spiral pipe (heat exchange branch pipe 52) of this embodiment is arranged at a required distance from the pump motor 32 so as not to come into contact with each other so as not to rub against each other due to vibration. Note that the form of the heat exchange branch pipe 52 is not limited to this, and it goes without saying that the heat conduction efficiency can be increased by attaching heat exchange fins, for example.

Further, in the reheater main body 51 of this embodiment, the plurality of heat exchange branch pipes 52 are provided upstream of the flow of compressed air from the plurality of heat exchange branch pipes 52, and the pump motor 32 is connected to the reheater main body 51. A straight upstream piping section 53 arranged parallel to the rotation axis and a straight pipe section 53 disposed downstream of the flow of compressed air from the plurality of heat exchange branch pipes 52 and arranged parallel to the rotation axis of the pump motor 32. It is provided by being formed in a U-shape and arranged in parallel with the straight downstream piping section 54.

By providing a plurality of heat exchange branch pipes 52 in this way, the pump motor 32, which has a substantially cylindrical outer shape and has a power terminal box 32b on one side (front side), can be heated again. The container body 51 can be arranged rationally. That is, the reheater main body 51 configured as a heat exchange section for reheating compressed air can be appropriately and rationally formed into a form with high heat exchange efficiency. Note that the plurality of heat exchange branch pipes 52 are fixed within a built-in box 70, which will be described later, by reheater fixing legs 56 shown in FIGS. 11 and 12.

Further, in this embodiment, the rotation axis of the pump motor 32 is arranged to extend vertically substantially along the vertical direction, and the plurality of heat exchange branch pipes 52 are arranged to extend substantially parallel to the horizontal plane. It is placed in a rotated position. In other words, the upstream piping section 53 and the downstream piping section 54 are arranged on both sides of the power terminal box 32b and extend vertically, and there is a space between the two piping sections vertically. A plurality of heat exchange branch pipes 52 are arranged horizontally. In this embodiment, the position corresponds to the open part of the U-shape (see FIGS. 3, 11, 13, etc.) of the heat exchange branch pipe 52, and the position below which the power terminal box 32b is arranged. A reheater main body part 51 is installed in relation.

According to this, the plurality of heat exchange branch pipes 52 can be compactly and rationally arranged in a form that further increases heat exchange efficiency. According to this embodiment, the compressed air is recirculated from the upper side via the upstream piping section 53 so that the airflow of the compressed air becomes a downward flow in the upstream piping section 53 and an upward flow in the downstream piping section 54. It is configured to be introduced into the heating device main body 51, pass through a plurality of heat exchange branch pipes 52, and be discharged upward via the downstream piping section 54 (see the solid line arrow shown in FIG. 2). ). According to this, the compressed air before being reheated flows downward within the upstream piping section 53, and the compressed air after being reheated flows upward within the downstream piping section 54, so that the flow of the compressed air is Pressure loss can be suppressed and smoothed, and efficient heat exchange can be performed.

Further, in this embodiment, the pump motor 32 includes a built-in cooling fan 33 that is fixed to the upper end of the rotating shaft of the pump motor 32 and rotates coaxially to generate a downward air flow. As a result, as shown by the dotted arrow in FIG. 2, the flow of cooling air generated by the built-in cooling fan 33 flows downward along the outer surface of the pump motor 32 and is heated. The flow of warmed cooling air (flow of heated air) hits the plurality of branch pipes 52 for heat exchange. As shown in FIGS. 10 to 12, a rib-shaped cooling fin portion 32a extending in the vertical direction is provided on the outer surface of the pump motor 32. The cooling air generated by the fan 33 is configured to flow therethrough.

According to this, the flow of heated air heated by the exhaust heat of the pump motor 32 and sent by the built-in cooling fan 33 constitutes the reheater main body 51, as well as the action of radiant heat due to the exhaust heat of the pump motor 32. The compressed air flowing inside the heat exchange branch pipes 52 is efficiently reheated by appropriately contacting the plurality of heat exchange branch pipes 52 . Note that the part where the power terminal box 32b is arranged blocks the flow of cooling air generated by the built-in cooling fan 33, but there is a U-shaped heat exchanger on the upper side of the power terminal box 32b. This is a portion where the branch pipe 52 is not located. Therefore, the U-shaped shape of the heat exchange branch pipe 52 according to this embodiment (see FIG. 3, etc.) is not a disadvantage and is a reasonable form for arranging a plurality of heat exchange branch pipes 52. Yes, compressed air can be effectively reheated. Further, the U-shaped configuration of the heat exchange branch pipe 52 can contribute to ease of maintenance when inspecting or replacing the cold water pressure pump 31 and the pump motor 32.

Further, in this embodiment, the compressed air reheater 50 includes a built-in box 70 that is provided to house the pump motor 32 and the reheater main body 51 disposed so as to surround the pump motor 32. ing. More specifically, as shown in FIGS. 2 to 4 and 8 to 10, this built-in box 70 has a rectangular casing shape, and as shown in FIG. It has a configuration that can be disassembled into a plate (wall plate part 71) and an inspection plate 74. According to this, the energy of the exhaust heat of the pump motor 32 can be appropriately retained inside the built-in box 70, and the compressed air can be effectively reheated.

Further, in this embodiment, a reheater exhaust fan 72 for ventilating the air inside the built-in box 70 is attached to the built-in box exhaust port 76 of the wall board section 71 constituting the built-in box 70. There is. This reheater exhaust fan 72 takes in cooling air (outside air) from a built-in box intake port 75 provided at the bottom of the built-in box 70 and heats it from a built-in box exhaust port 76 provided at the top of the built-in box 70. It operates to exhaust the cooled air. According to this, when the internal air of the built-in box 70 rises above the set temperature, the air can be forcibly exhausted to prevent the inside of the built-in box 70 from overheating. In addition, the air volume of the reheater exhaust fan 72 can be variably adjusted by inverter control based on information from a temperature sensor 77 (see FIG. 2) provided in the built-in box 70. The internal temperature of the built-in box 70 can be adjusted appropriately. This also allows the reheating of the compressed air by the compressed air reheater 50 to be adjusted as appropriate, and also prevents the pump motor 32 from overheating. Furthermore, since the built-in box intake port 75 and the built-in box exhaust port 76 are arranged at substantially diagonal positions as in this embodiment, the heat from the power terminal box 32b can be smoothly discharged (exhausted), and the Since the flow path of the exchange branch pipe 52 is configured to flow cooling air so as to cross the flow path, the air inside the built-in box 70 can be exhausted to facilitate heat exchange. In addition, regarding the relationship between the reheater exhaust fan 72 and the built-in cooling fan 33, when both are in operation, the stirring effect of stirring the cooling air prevents local overheating and makes it uniform. This allows efficient heat exchange as a whole.

Next, regarding an example (example) of the heat distribution generated by the three heat exchangers (reheater, primary heat exchanger, secondary heat exchanger) corresponding to the configuration example shown in FIG. 1, the chart diagram in FIG. The explanation will be based on. The reheater in FIG. 14 is the compressed air reheater 50 shown in FIG. 1, and the primary heat exchanger is the built-in reheater section 27 built in the compressed air dehumidifier shown in FIG. The secondary heat exchanger refers to the water-cooled cooling section 28 built into the compressed air dehumidifier shown in FIG.

In this example, the conditions are: air volume: 83 m ³ /h (1.35 ^{m 3} /min), inlet air: 0.7 MPa, saturation at 30°C, ambient environment: 25°C, 75% RH (DP 20°C), cooling Water inlet temperature: At 13℃, the target value of the product compressed air to be discharged (exhausted) is that when the inlet air temperature is 30℃, the outlet temperature (exhaust temperature) is above the ambient temperature, and the dew point is below the outlet air pressure. The temperature is set to be below 17 degrees Celsius.

As shown in FIG. 14, first, in the primary heat exchanger (built-in reheater section 27 shown in FIG. 1), compressed air (30° C.) supplied from the compressor (compressed air generator 15) is dehumidified. When introduced (AIR IN) from the compressed air inlet 21 of the device 20 into its built-in reheater section 27, 130 W of heat is exchanged with the compressed air heading toward the compressed air outlet 22 of the compressed air dehumidifier 20. , the temperature of the compressed air is cooled from 30°C to 27°C.

Next, in the secondary heat exchanger (water-cooled cooling section 28 shown in FIG. 1), when the compressed air (27° C.) cooled by the built-in reheater section 27 is introduced into the water-cooled cooling section 28, A heat exchange of 335 W is performed with the cooling water (13°C to 14°C) flowing through the cooling water pipe 25 for cooling the compressed air, and the temperature of the compressed air is cooled from 27°C to 17°C.

Next, in the primary heat exchanger (built-in reheater section 27 shown in FIG. 1), compressed air (17° C.) cooled by the water-cooled cooling section 28 is introduced into the built-in reheater section 27. Heat exchange is performed with the compressed air introduced from the compressed air inlet 21 of the compressed air dehumidifier 20, and the temperature of the compressed air is reheated from 17° C. to 21° C., resulting in a heat exchange of 130 W.

Then, when the compressed air (21° C.) reheated in the built-in reheater section 27 is discharged from the compressed air outlet 22 of the compressed air dehumidifier 20 and introduced into the compressed air reheater 50, the pump motor 32 A 130W heat exchange is performed between the compressed air and the exhaust heat (45℃) generated by the heat generation of It is discharged (AIR OUT) from the outlet 55. Thereby, product compressed air that satisfies the target value can be efficiently discharged. Note that when the product compressed air is discharged from the product compressed air outlet 55 in this way, for example, in this embodiment, cold water adjusted to 22° C. flows through the cold water outlet pipe 44 into the chilled water supply section 80. The cold water that is supplied and heated to 24° C. in the cooled water supply section 80 is set to flow through the cold water return pipe 42 and be returned. By the way, in cases such as when starting operation in winter, when the temperature of the cooled water supply section 80 is low and the temperature of the cold water 100 in the cold water storage tank 40 is lower than that of the cooling water, the cold water 100 becomes a cold water heat source. It will be heated by the exchanger 34. In such a case, the first on-off valve (cooling water on-off valve) 36, which will be described later, is closed to stop heat exchange by the cooling water in the cold water heat exchanger 34, and the third on-off valve (bypass on-off valve, which will be described later) is closed. ) 46 as appropriate and operate the pump motor 32 to operate the cold water pressure pump 31 to raise the temperature of the cold water 100 to a required temperature. According to this, even when the external environment changes to a low temperature, the temperature of the cold water supplied to the cooled water supply section 80 can be appropriately adjusted.

Further, the positional relationship between the compressed air dehumidifier 20 and the cold water supply device 30 of this embodiment in a package unit in which the two are mounted is as shown in FIGS. 5 to 7. It is located at 20. Note that the compressed air dehumidifier 20 and the cold water supply device 30 of this embodiment are arranged so as to be built into the same housing, and are provided so as to share a power source. The compressed air introduced into the compressed air dehumidifier 20 has a temperature of, for example, 30° C., the compressed air inlet 21 and the compressed air outlet 22 are arranged at the top of the device casing 23, and the built-in reheater section 27 is located at the top of the device casing. It is arranged in the upper part of the body 23. Further, the cooling water introduced into the compressed air dehumidifying device 20 has a temperature of, for example, 13° C., and a water-cooled cooling unit 28 is disposed in the lower part of the device housing 23. Therefore, the temperature of the upper part of the compressed air dehumidifier 20 is high, and the temperature of the lower part of the compressed air dehumidifier 20, which is close to the pump motor 32 where exhaust heat (45° C.) is generated, is low.

Therefore, as described above, the airflow of compressed air becomes a downward flow on the side where it is introduced into the reheater main body 51, and the airflow of reheated compressed air becomes a downward flow on the side where it is discharged from the reheater main body 51. This creates an upward flow, allowing smooth flow of compressed air and efficient heat exchange. In addition to this, the compressed air dehumidifier 20 whose temperature is lower than the exhaust heat temperature of the pump motor 32 is arranged above the cold water supply device 30. According to this, a convection phenomenon occurs in which low-temperature air descends inside the package from the low-temperature compressed air dehumidifying device 20, and a cooling effect is effectively performed, making it possible to prevent the cold water supply device 30 from overheating. . In addition, since the piping from the downstream piping section 54 where the compressed air outlet channel 24 and the product compressed air outlet 55 are provided is located above the unit, the compressed air is easily reheated, and the reheated compressed air are in a position that makes it easy to maintain that temperature.

Next, an embodiment of a cold water supply unit equipped with a compressed air dehumidifier related to the present invention will be described in detail based on the accompanying drawings (FIGS. 1 to 4).
In addition to the above-described configuration, the cold water supply unit including the compressed air dehumidifying device related to the present invention is configured so that exhaust heat generated from the pump motor 32 of the cold water pressure pump 31 is cooled from the cooling water source 10. A cooling water pipe 65 for cooling the pump motor is provided, which is a pipe through which the supplied cooling water flows, and has a portion disposed adjacent to the pump motor 32 .

In this embodiment, the cooling water pipe 65 for cooling the pump motor is a pipe for circulating cooling water, and directs the cooling water to a part (a part that performs heat exchange) arranged adjacent to the pump motor 32. A continuous pipe line for supplying cooling water (a pipe line on the upstream side of the flow of cooling water) and a pipe line that continuously returns from the part where heat exchange is performed to the cooling water source 10 (a pipe line on the downstream side of the flow of cooling water) ). In addition, in the present embodiment shown in FIG. Although the branch pipe line 12) is further branched from the branch pipe line 12), it may be directly connected to the cooling water pipe 11. Further, the cooling water pipe 65 for cooling the pump motor of this embodiment may be formed in a spiral shape in order to increase heat absorption efficiency similarly to the heat exchange branch pipe 52, or may be formed in a U-shape as shown in FIG. By being formed into a shape, maintainability can be improved. Furthermore, the cooling water pipe 65 for cooling the pump motor is disposed above the suction port of the built-in cooling fan 33 and above the built-in box exhaust port 76, thereby interfering with the exhaust air by the reheater exhaust fan 72. Therefore, the pump motor 32 can be effectively cooled.

According to this cooling water piping 65 for cooling the pump motor, when the compressed air dehumidifier 20 and the cold water supply device 30, which share the cooling action of the cooling water supplied from the cooling water source 10, are integrated into a unit, The pump motor 32, which generates heat, can be appropriately cooled depending on the operating status. That is, for example, when only the cold water supply device 30 is operated without operating the compressed air dehumidifier 20, or when the operation of the compressed air dehumidifier 20 is at a low level and the pump motor 32 cannot be sufficiently cooled, The pump motor 32 can be forcibly cooled. Further, even if the external environment becomes high temperature and the pump motor 32 cannot be sufficiently cooled by the built-in cooling fan 33 or the reheater exhaust fan 72, the pump motor 32 can be appropriately cooled to prevent overheating. Of course. Furthermore, when the compressed air dehumidifier 20 is in operation, by appropriately adjusting and controlling the flow rate of the coolant flowing into the coolant pipe 65 for cooling the pump motor, the air is discharged from the product compressed air outlet 55 (AIR OUT ) The outlet temperature of the product compressed air can be adjusted as appropriate. In this cooling water piping 65 for cooling the pump motor, drain water is also generated by cooling the exhaust heat of the pump motor 32, but this drain water is also similar to the drain water of the compressed air reheater 50. It is discharged from the lower part of the built-in box 70 to the outside through a flow path (not shown).

Furthermore, in this embodiment, the pump motor cooling cooling water piping 65 is provided with an on-off valve (second on-off valve 66) that opens and closes the pump motor cooling cooling water piping 65. There is. By opening the second on-off valve 66, the pump motor 32 can be cooled by circulating cooling water. When the pump motor 32 does not need to be cooled by the pump motor cooling water pipe 65, the second on-off valve 66 is closed. Further, in this embodiment, the second on-off valve 66 is a flow rate control valve, and is configured such that electromagnetic control regarding opening and closing thereof is performed by the control device 90.

Further, in this embodiment, the cooling water piping 25 for cooling compressed air and the cooling water piping 65 for cooling the pump motor are arranged in parallel with the cooling water piping 11 through which the cooling water supplied from the cooling water source 10 flows. has been done. According to this, for example, the cooling water piping 25 for compressed air cooling and the cooling water piping 65 for cooling the pump motor can be rationally connected and piped to one cooling water source 10, and can be integrated as a device unit. There is an advantage that the compressed air dehumidifier 20 and the cold water supply device 30 can be rationally incorporated into one casing. In this embodiment, a cooling water piping 25 for cooling compressed air and a cooling water piping 65 for cooling the pump motor are connected from a branch pipe 12 of the cooling water piping, which is a pipe branched from the cooling water piping 11. is branched, and the return pipe part 12(a) of the branch pipe line of the cooling water pipe is connected to the return pipe part 11(a) of the cooling water pipe, so that the cooling water of the cooling water source 10 is circulated. is configured to do so. Further, as shown in FIG. 1, a flow meter 12b with an adjustment valve is connected to the return pipe section 12(a) of the branch pipe of the cooling water pipe, so that the flow rate can be checked and adjusted.

In this embodiment, as shown in FIG. 2 etc., the pump motor 32 has a built-in cooling fan 33 that is fixed to the upper end of the rotating shaft of the pump motor 32 and rotates coaxially to generate a downward air flow. A cooling water pipe 65 for cooling the pump motor is arranged above the built-in cooling fan 33. According to this, the cooling air cooled by the cooling water pipe 65 for cooling the pump motor is efficiently sucked by the built-in cooling fan 33, and the air flow (flow of cooling air) generated by the built-in cooling fan 33 Accordingly, the pump motor 32 can be efficiently cooled and the pump motor 32 can be prevented from overheating.

Next, an embodiment of a cold water supply unit including a compressed air dehumidifying device related to the present invention will be described in detail based on the accompanying drawings (FIGS. 1, 5 to 7, etc.).
In addition to the configuration described above, the cold water supply device unit including the compressed air dehumidification device related to the present invention is connected to the cold water discharge port 43 of the cold water pressure pump 31 to supply cold water to the chilled water supply section 80. A cold water pipe provided as a cold water bypass flow path by connecting between the cold water outlet pipe 44 and the cold water return pipe 42 connected to return the cold water to the cold water tank 40 when supplied to the chilled water supply section 80. A bypass pipe 45 is provided.

According to this, in a compressed air dehumidifying device and a cold water supply device that commonly use the cooling action of cooling water supplied from a cooling water source, when cold water is not supplied to the cooled water supply section 80, or when the amount of cold water supplied is Depending on the operating conditions of both devices, such as when the pump motor 32 is small, the compressed air can be appropriately reheated using the pump motor 32 as a heat source. That is, by circulating cold water through the cold water bypass pipe 45 by the cold water pressure pump 31, the pump motor 32 consumes the required energy, and the exhaust heat generated from the pump motor 32 is used to reheat the compressed air. can. At this time, no cold water is supplied to the chilled water supply unit 80, or the amount of cold water supplied is reduced, so that the amount of energy for cooling the cold water by the cold water heat exchanger is reduced. Therefore, even when cold water is not supplied to the cooled water supply section 80 or when the amount of cold water supplied is small, energy consumption can be reduced as much as possible and compressed air can be efficiently reheated.

Further, according to this embodiment, a bypass opening/closing valve 46 that opens and closes the pipeline of the cold water bypass piping 45 and a bypass valve 46 that opens and closes the pipe line of the cold water bypass piping 45 and a bypass valve 46 that connects the cooling water supplied from the cooling water source 10 to the cold water heat exchanger 34 (the primary of the cold water heat exchanger 34) are provided. A cooling water opening/closing valve 36 is provided for opening and closing a pipe line of a cooling water piping 35 for cooling cold water flowing through a side flow path. Note that the cooling water pipe 35 for cold water cooling forms a pipe line that is connected to the cooling water pipe 11 in a continuous manner, and the return pipe section 35 (a) of the cooling water pipe for cooling the cold water is used for cooling. By being continuously connected to the return pipe portion 11(a) of the water piping, the cooling water from the cooling water source 10 is configured to flow and circulate through the primary flow path of the cold water heat exchanger 34. There is. Further, as shown in FIGS. 1 and 5, the cooling water inlet 11b and the cooling water outlet 11c are connection ports for connecting to the cooling water source 10.

According to this, when the chilled water supply section 80 does not require cold water, the amount of cold water supplied to the chilled water supply section 80 and the supply of cooling water distributed to the primary flow path of the cold water heat exchanger 34 can be adjusted. The amount can be adjusted as appropriate depending on the operating conditions of the compressed air dehumidifier 20 and the cold water supply device 30. Note that opening and closing of the bypass on-off valve 46 and the cooling water on-off valve 36 is not limited to fully open and fully closed, but also includes opening and closing by variably adjusting the opening degree, and intermittent opening and closing. This includes appropriately adjusting the flow rate of cold water or cooling water. Thereby, efficient operation of the compressed air dehumidifier 20 and the cold water supply device 30 can be realized.

Further, according to this embodiment, the bypass on-off valve 46 and the cooling water on-off valve 36 are provided by flow control valves, and when the supply of cold water to the chilled water supply section 80 is stopped, includes a control device 90 that controls the bypass on-off valve 46 to open and the cooling water on-off valve 36 to close. According to this, even when cold water is not supplied to the cooled water supply unit 80, the compressed air can be appropriately reheated using the pump motor 32 as a heat source, and the usage conditions can be automatically responded to.

Further, the cold water supply device 30 of this embodiment is a cold water circulation supply device (chiller device) in which cold water is circulated, and the cold water supplied to the chilled water supply unit 80 for water cooling is returned to the cold water tank 40. A cold water circulation channel is provided to ensure that The cold water circulation waterway of this embodiment includes a cold water outlet pipe 44 that is connected to a cold water outlet 43 of a cold water pressure pump 31 and discharges cold water from a cold water tank 40, and a cold water outlet pipe 44 that supplies cold water from a chilled water supply section 80 to the side of the cold water tank 40. A cold water return pipe 42 that is piped between the chilled water supply section 80 and the cold water heat exchanger 34 so as to return the water to the cold water heat exchanger 34, a secondary flow path of the cold water heat exchanger 34, and the cold water heat exchanger 34. The cold water inlet connection pipe 41a connects the secondary flow path of the cold water tank 40 to the cold water tank inlet 41 of the cold water tank 40. Note that, as shown in FIGS. 1 and 5, the cold water inlet 42a and the cold water outlet 44a are connection ports for connecting to the cooled water supply section 80.

Further, the cold water tank 40 of this embodiment is provided with an overflow 40a, a float switch 40b for adjusting the amount of water, a drain pipe 40c, a drain opening/closing valve 40d, and a water temperature sensor 40e. A water pressure gauge 44b is arranged on the cold water outlet pipe 44.

Next, an embodiment of a cold water supply unit including a compressed air dehumidifier according to the present invention will be described in detail based on the accompanying drawings (FIGS. 1 to 13).
In addition to the above-described configuration, the cold water supply unit including the compressed air dehumidifier related to the present invention has a cold water cooling system that distributes the cooling water supplied from the cooling water source 10 to the cold water heat exchanger 34. A first on-off valve 36 which is a cooling water on-off valve that opens and closes the cooling water piping 35, a cooling water opening and closing valve that opens and closes the piping of the cooling water piping 35 for chilled water cooling, and a first opening and closing valve that opens and closes the piping of the cooling water piping 65 for cooling the pump motor. the second on-off valve 66, the third on-off valve 46 which is a bypass on-off valve that opens and closes the pipeline of the cold water bypass piping 45, and the fourth on-off valve that opens and closes the pipeline of the cooling water piping 25 for cooling compressed air. 26.

According to this, in the compressed air dehumidifying device 20 and the chilled water supply device 30, which commonly use the cooling effect of cooling water supplied from a cooling water source, it is possible to reduce energy consumption by interaction with the external environmental conditions. Correspondingly, both operations can be linked and controlled rationally and optimally. In other words, by providing each of the on-off valves 36, 66, 46, and 26, the flow of cooling water and cold water can be optimally controlled, and both consume a large amount of energy, and a reduction in energy consumption is required. The operational performance of both the cold water supply device 20 and the cold water supply device 30 can be improved.

Further, in this embodiment, each of the first on-off valve 36, the second on-off valve 66, the third on-off valve 46, and the fourth on-off valve 26 is provided by a flow rate control valve, and the flow rate A control device 90 is provided to control the control valve. According to this, the opening and closing of each on-off valve 36, 66, 46, 26,
The control device 90 can automatically control fully open, fully closed, intermittently or variably. Note that variable control of the operating output of the cold water pressure pump 31 is preferably provided so that the control device 90 performs inverter control of the operation of the pump motor 32.

Further, in this embodiment, as a control program for the control device 90, a plurality of control modes corresponding to seasons are stored in the storage device of the control device. According to this, the operation of the compressed air dehumidifier 20 and the cold water supply device 30 can be appropriately controlled depending on the season. That is, by controlling the on-off valves 36, 66, 46, 26 and the cold water pressure pump 31 according to the season, the flow of cooling water and cold water can be optimally controlled, and the temperature and humidity of the compressed air can be stabilized. It is possible to stably optimize the chiller water temperature while optimizing the water temperature.

Further, regarding the specific control program, in the control mode, for example, as a mode when the temperature of the cooling water decreases, the first opening/closing valve 36 is opened at a low opening or intermittently, and the second opening/closing valve 36 is opened at a low opening or intermittently. A winter mode is provided in which the valve 66 is closed, the third on-off valve 46 is opened at a low opening degree, the fourth on-off valve 26 is opened intermittently, and the pump motor 32 is variably operated, and the temperature of the cooling water is increased. In the actual mode, the first on-off valve 36 is fully opened, the second on-off valve 66 is closed, the third on-off valve 46 is closed, the fourth on-off valve 26 is opened, and the pump motor 32 is variably operated. It may also have a summer mode. According to this, the operation of the compressed air dehumidifier 20 and the cold water supply device 30 can be precisely controlled depending on the season.

Furthermore, regarding specific control programs, in addition to winter mode (for example, when the temperature of the cooling water is 6 to 10 degrees Celsius) and summer mode (for example, when the temperature of the cooling water is 16 to 20 degrees Celsius), In a mode where the temperature is between winter and summer (for example, when the temperature of the cooling water is 11 to 15 degrees Celsius), the first on-off valve 36 is variably opened, the second on-off valve 66 is intermittently opened, and the third on-off valve is opened intermittently. A spring/autumn mode may be provided in which the on-off valve 46 is variably opened, the fourth on-off valve 26 is opened, and the pump motor 32 is variably operated. According to this, the operation of the compressed air dehumidifier 20 and the cold water supply device 30 can be controlled more precisely depending on the season. In addition, the specific control mode explained above is set so that it may be applied when the compressed air dehumidification device 20 and the cold water supply device 30 are respectively operating with a specified load.

In the above embodiments, a cold water supply device unit including a compressed air dehumidifier that supplies compressed air and cold water to production equipment such as machine tools has been described. However, the present invention is not limited thereto; compressed air is a concept that includes compressed gas, cooling water is a concept that includes cooling liquid (liquid heat medium), and cold water is a concept that includes cold liquid (liquid heat medium). It goes without saying that the concept is not limited to production equipment such as machine tools. That is, the present invention can be used in facilities in all fields that require compressed gas with controlled temperature and humidity and liquid heat medium (chiller refrigerant) with controlled temperature. The compressed gas may include, for example, air whose components have been adjusted or air containing an inert gas, and the liquid heat medium, which is cooling water or cold water, may include, for example, antifreeze.
Furthermore, in the above embodiment, a shell-type embodiment is illustrated in FIG. 1 as the device casing 23 of the compressed air dehumidification device 20, but the present invention is not limited to this, and a plate-type (laminated type) or This does not exclude the use of double-tube heat exchangers.

Although the present invention has been variously explained above using preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is about.

10 Cooling water source 11 Cooling water pipe 11 (a) Return pipe part 11b of cooling water pipe Cooling water inlet 11c Cooling water outlet 12 Branch pipe line 12 (a) of cooling water pipe Return pipe part 12b of branch pipe line of cooling water pipe Flowmeter with regulating valve 15 Compressed air generator 20 Compressed air dehumidifier 21 Compressed air inlet 22 Compressed air outlet 23 Device housing 23a Communication section 23b Outlet communication section 24 Compressed air outlet channel 25 Cooling water piping 25a for compressed air cooling Folded tip 25b Heat exchange fin 26 Fourth on-off valve 27 Built-in reheater section 27a Primary compressed air flow path 27b Secondary compressed air flow path 28 Water-cooled cooling section 28a Compressed air water-cooled flow path 29 Drain pipe 29a Drain opening/closing valve 29b Drain outlet 30 Cold water supply device 31 Cold water pressure pump 31a Suction port 32 Pump motor 32a Ribbed cooling fin portion 32b Power terminal box 33 Built-in cooling fan 34 Cold water heat exchanger 35 Cooling water for cold water cooling Piping 35 (a) Return pipe section 36 of cooling water piping for chilled water cooling First on-off valve (cooling water on-off valve)
40 Cold water tank 40a Overflow 40b Float switch 40c for adjusting water volume Drain pipe 40d Drain opening/closing valve 40e Water temperature sensor 41 Cold water tank inlet 41a Cold water inlet connection pipe 42 Cold water return pipe 42a Cold water inlet 43 Cold water discharge port 44 of cold water pressure pump Outlet piping 44a Chilled water outlet 44b Water pressure gauge 45 Chilled water bypass piping 46 Third on-off valve (bypass on-off valve)
50 Compressed air reheater 50a Reheat flow path 51 Reheater main body 52 Heat exchange branch pipe 53 Upstream piping section 54 Downstream piping section 55 Product compressed air outlet 56 Reheater fixed leg 65 Pump motor cooling Cooling water piping 66 Second on-off valve 70 Built-in box 71 Wall plate part 72 Reheater exhaust fan 73 Reheater cover body 74 Inspection plate 75 Built-in box intake port 76 Built-in box exhaust port 77 Temperature sensor 80 Chilled water supply section 90 Control device 100 Cold water (cold liquid)

Claims (6)

A device casing as a pressure vessel provided with a compressed air inlet through which compressed air is introduced and a compressed air outlet through which dehumidified compressed air is discharged, and cooling water supplied from a cooling water source into the inside of the device casing. a compressed air dehumidifier comprising a cooling water pipe for cooling the compressed air, which is a pipe for circulating the compressed air and is arranged to cool the compressed air and cause moisture in the compressed air to condense;
Cold water in which cold water cooled by the cold water heat exchanger is stored so that the cold water cooled by the cooling water supplied from the cooling water source via the cold water heat exchanger is supplied to the chilled water supply section. a cold water supply device comprising a water tank and a cold water pump installed to forcefully transport the cold water stored in the cold water tank;
A cold water supply device unit comprising a compressed air dehumidification device comprising:
The compressed air dehumidifier is connected to a compressed air outlet flow path extending from the compressed air outlet, and is cooled by the compressed air dehumidifier by heating the compressed air with exhaust heat generated from the pump motor of the cold water pump. a compressed air reheater provided with a reheating passage disposed adjacent to the pump motor so as to reheat the compressed air;
a cooling water pipe for cooling cold water that circulates the cooling water supplied from the cooling water source to the cold water heat exchanger;
A pump having a pipe line through which cooling water supplied from the cooling water source flows so as to cool waste heat generated from the pump motor of the cold water pressure pump, and having a portion disposed adjacent to the pump motor. Cooling water piping for motor cooling,
A cold water outlet pipe connected to a cold water discharge port of the cold water pressure pump to supply cold water to the chilled water supply section, and a cold water outlet pipe connected to return cold water to the cold water tank when supplied to the chilled water supply section. A cold water bypass pipe connected to the cold water return pipe and provided as a cold water bypass flow path,
a first on-off valve that is a cooling water on-off valve that opens and closes a pipe line of the cooling water piping for cooling the cold water;
a second on-off valve that opens and closes a pipe line of the cooling water pipe for cooling the pump motor;
a third on-off valve that is a bypass on-off valve that opens and closes the pipeline of the cold water bypass piping;
A cold water supply device unit equipped with a compressed air dehumidifier, characterized in that it is provided with a fourth on-off valve that opens and closes a conduit of the cooling water piping for cooling the compressed air. Each of the first on-off valve, the second on-off valve, the third on-off valve, and the fourth on-off valve is provided by a flow control valve, and a control device that controls the flow control valve. A cold water supply unit comprising a compressed air dehumidifier according to claim 2. 3. The cold water supply unit including a compressed air dehumidifier according to claim 2, wherein a plurality of control modes corresponding to seasons are stored in a storage device of the control device as a control program for the control device. In the control mode, when the temperature of the cooling water decreases, the first on-off valve is opened at a low opening or intermittently, the second on-off valve is closed, and the third on-off valve is opened. A winter mode is provided in which the fourth on-off valve is opened at a low opening degree or opened, the fourth on-off valve is opened intermittently, and the pump motor is variably operated. 3. A summer mode in which the pump motor is fully opened, the second on-off valve is closed, the third on-off valve is closed, the fourth on-off valve is opened, and the pump motor is variably operated. A cold water supply unit comprising the compressed air dehumidifier as described. In addition to the winter mode and the summer mode, the first on-off valve is variably opened, the second on-off valve is intermittently opened, and the third on-off valve is set to a mode where the temperature of the cooling water is between winter and summer. 5. The chilled water supply device unit equipped with a compressed air dehumidifier according to claim 4, further comprising a spring/autumn mode in which the fourth on-off valve is variably opened, the fourth on-off valve is opened, and the pump motor is variably operated. The compressed air reheater has a reheater main body in which the reheat flow path is provided in a form surrounding the pump motor and branched by a plurality of heat exchange branch pipes. A cold water supply unit comprising a compressed air dehumidifier according to any one of claims 1 to 5.

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