WO2017006644A1

WO2017006644A1 - Heat-exchange unit

Info

Publication number: WO2017006644A1
Application number: PCT/JP2016/065873
Authority: WO
Inventors: 孝祐東; 和久福谷
Original assignee: 株式会社神戸製鋼所
Priority date: 2015-07-09
Filing date: 2016-05-30
Publication date: 2017-01-12
Also published as: JP6557530B2; CN107735614A; MY185415A; CN107735614B; JP2017020554A

Abstract

A heat-exchange unit that is provided with a unit component and with a control unit (70). The unit component has a plurality of heat-exchange devices (20), and each heat-exchange device (20) has a blower (20) and a heat exchanger (40). The control unit (70) is provided with: a re-intake determination unit (72) that determines whether re-intake of low-temperature air is occurring; a wind-direction determination unit (74) that determines wind direction; and a wind-volume control unit (76) that performs one-way control that, when the re-intake determination unit (72) has determined that re-intake is occurring, adjusts the rotational speed of each blower (30) such that a one-way slope that is based on the difference or ratio between the rotational speed of an upwind-device blower (30) and the rotational speed of a downwind-device blower (30) is larger than a steady-state one-way slope and such that the rotational speed of the blowers (30) progressively increases from the downwind device to the upwind device.

Description

Heat exchange unit

The present invention relates to a heat exchange unit.

Conventionally, an air temperature type heat exchange device is known in which a low-temperature medium (liquefied natural gas or the like) lower in temperature than air is vaporized by heating with air (atmosphere). For example, Patent Document 1 discloses a low-temperature liquefied gas vaporization comprising: an evaporator that evaporates the intermediate medium by heat-exchanging the intermediate medium having a temperature lower than that of air; and a heating device that heats the low-temperature liquefied gas. An apparatus (heat exchange unit) is disclosed. The evaporator includes a blower that forms an airflow in the vertical direction, and a heat exchanger that heats the intermediate medium by exchanging heat between the intermediate medium and the airflow. Similarly, the heating device includes a blower that forms a vertical airflow, and a heat exchanger that heats the low-temperature liquefied gas by exchanging heat between the low-temperature liquefied gas and the airflow.

In the heat exchange unit as described in the above-mentioned Patent Document 1, when the wind is blowing toward the heat exchange unit, the airflow flowing out from the heat exchanger, that is, the low temperature after heat exchange in the heat exchanger The blower may draw air again. Specifically, since each blower is normally driven at a constant rotational speed, the low-temperature air flows toward the side of each device (in the direction away from the heat exchange unit). When the direction and the wind direction are opposite, the blower may suck the low-temperature air again by returning the low-temperature air directed to the side of the apparatus to the apparatus side by the wind. In this case, air (air around the heat exchanger) whose temperature has been lowered due to the influence of the airflow (low temperature air) after heat exchange in the heat exchanger is supplied to the heat exchanger. Heat exchange (heating of the low temperature medium) is not performed. In addition, since a wind direction changes every moment, the heat exchanger from which heat exchange efficiency becomes low also changes according to the wind direction.

Japanese Patent Laid-Open No. 2015-061982

An object of the present invention is to provide a heat exchange unit capable of suppressing re-suction of low-temperature exhaust by a blower caused by wind.

The heat exchange unit according to one aspect of the present invention includes at least one unit component and a control unit, and the at least one unit component is arranged in a plurality of heat exchanges arranged in one direction. Each heat exchange device has a blower that forms an airflow that flows in the vertical direction, a heat exchanger that heats the low-temperature medium by exchanging heat between the low-temperature medium and airflow that is lower than the atmosphere, and The control unit includes a re-suction determination unit that determines whether or not the low-temperature air that has flowed out of the heat exchanger out of the air flow is re-sucked by the blower, and a wind direction determination unit that determines a wind direction. And when the re-suction determination unit determines that the re-suction has occurred, the most wind in the one direction with respect to the wind direction determined by the wind direction determination unit among the plurality of heat exchange devices. Of the one-way leeward device located on the most leeward side in the one direction with respect to the rotational speed of the blower of the one-way windward device located on the side and the wind direction determined by the wind direction determining unit among the plurality of heat exchange devices. The one-way inclination expressed based on the difference or ratio with the rotation speed of the blower is larger than the one-way inclination at the time of steady state where the re-suction determination unit does not determine that the re-suction has occurred, And an air volume control unit that performs one-way control for adjusting the rotational speed of each blower so that the rotational speed of the blower gradually increases as it goes from the one-way leeward device to the one-way windward device.

It is a figure which shows the outline of a structure of the heat exchange unit of one Embodiment of this invention. FIG. 2 is a cross-sectional view taken along line II-II in FIG. FIG. 3 is a view corresponding to FIG. 2 schematically showing an air flow during control by the air volume control unit. It is a figure which shows the example of the rotation speed of each air blower at the time of one-way control. It is a figure which shows the example of the rotation speed of each air blower at the time of orthogonal direction control. It is a figure which shows the example of the rotation speed of each fan at the time of one direction control and orthogonal direction control. It is a flowchart which shows the control content of a control part. It is a flowchart which shows the control content of a control part. It is a flowchart which shows the control content of a control part. It is a graph which shows the relationship between the rotation speed ratio of each air blower in case a wind speed is 3 m / s, and 1st average suction temperature Tav1. It is a graph which shows the relationship between the rotation speed ratio of each air blower in case a wind speed is 10 m / s, and 1st average suction temperature Tav1.

A heat exchange unit according to an embodiment of the present invention will be described with reference to FIGS. This heat exchange unit is a device that heats a low-temperature medium by exchanging heat between a low-temperature medium (low-temperature liquefied gas, intermediate medium, etc.) that is lower in temperature than air (atmosphere) and air. The heat exchange unit may be used for directly heating the low-temperature liquefied gas with air, or in a so-called intermediate medium type heat exchange unit (an apparatus for heating the low-temperature liquefied gas using an intermediate medium such as propane). It may be used to heat the intermediate medium.

As shown in FIGS. 1 to 3, the heat exchange unit includes a plurality of heat exchange devices 20 and a control unit 70. In addition, illustration of the control part 70 is abbreviate | omitted in FIG. Each heat exchange device 20 has the same shape.

The plurality of heat exchange devices 20 are arranged in a matrix formed by a plurality of rows and a plurality of columns. Each row extends in one direction, and each column extends in an orthogonal direction orthogonal to the one direction. In the present embodiment, the plurality of heat exchange devices 20 are arranged such that six heat exchange devices 20 are arranged along each row, and two heat exchange devices 20 are arranged along each column.

Hereinafter, a virtual plane that is orthogonal to the one direction and passes through the center of the heat exchange unit with respect to the one direction is referred to as “one-direction center plane P1”, and is a plane that is orthogonal to the orthogonal direction. A virtual plane passing through the center of the heat exchange unit in the orthogonal direction is referred to as “orthogonal direction center plane P2”. Further, the three heat exchange devices 20 located in a predetermined region and arranged along one direction among the four regions defined by the one-direction center plane P1 and the orthogonal direction center plane P2 are collectively referred to as “first unit configuration”. Element 11 ". Further, the three heat exchange devices 20 that are adjacent to the first unit component 11 in the orthogonal direction and arranged in one direction are collectively referred to as a “second unit component 12”, and the first unit component 11 is in one direction. The three heat exchange devices 20 that are adjacent to each other and arranged in one direction are collectively referred to as “third unit component 13”. The three heat exchange devices 20 adjacent to the second unit component 12 in one direction and adjacent to the third unit component 13 in the orthogonal direction and arranged along the one direction are collectively referred to as a “fourth unit configuration. Element 14 ".

As shown in FIG. 2, each heat exchange device 20 has a blower 30, a heat exchanger 40, and a support portion 50.

The blower 30 forms an airflow that flows downward (downward airflow). Specifically, the blower 30 includes a cylindrical blower chamber 32, a fan 34 disposed in the blower chamber 32, and a motor 36 that drives the fan 34. The fan 34 is disposed in the blower chamber 32 so as to form a downward airflow that flows vertically downward when the motor 36 is driven. The rotation speed of the motor 36 can be adjusted by an inverter.

The heat exchanger 40 evaporates at least a part of the low temperature medium by exchanging heat between the downdraft (air) formed by the blower 30 and the low temperature medium. Specifically, the heat exchanger 40 includes a heat exchange chamber 42 and a heat transfer tube 44 disposed in the heat exchange chamber 42.

The heat exchange chamber 42 is formed in a square cylinder shape. The upper end of the heat exchange chamber 42 is connected to the lower end of the blower chamber 32 through a hollow connecting portion 38. For this reason, the airflow formed by the blower 30 passes through the inside of the heat exchange chamber 42 and goes downward of the heat exchange chamber 42.

In the heat transfer tube 44, a low-temperature medium (low-temperature liquefied gas or intermediate medium) flows. When the airflow contacts the heat transfer tube 44 in the heat exchange chamber 42, that is, when the airflow and the low temperature medium exchange heat, at least a part of the low temperature medium flowing in the heat transfer tube 44 evaporates. In the present embodiment, the heat transfer tube 44 on one side (right side in FIG. 2) and the heat transfer tube 44 on the other side (left side in FIG. 2) of the heat exchange devices 20 adjacent to each other are formed so as to communicate with each other. . The one side heat transfer tube 44 is folded in the heat exchange chamber 42.

The support unit 50 supports the heat exchanger 40 at a position spaced upward from the ground. Specifically, the support unit 50 supports the heat exchange chamber 42 in a posture in which the central axis of the heat exchange chamber 42 is parallel to the vertical direction. Note that the central axis of the blower chamber 32 is also in a posture parallel to the vertical direction.

In the present embodiment, a tread plate 60 is connected to the outer surface of the heat exchange chamber 42. The tread plate 60 is formed in a net shape and is connected to the upper end of the outer surface of the heat exchange chamber 42. The tread board 60 is set to a strength that allows a person to walk on the tread board 60.

The control unit 70 includes a re-suction determination unit 72, a wind direction determination unit 74, and an air volume control unit 76.

The re-suction determination unit 72 determines whether or not re-suction by the blower 30 of the low-temperature air that has flowed out of the heat exchanger 40 out of the airflow formed by the blower 30 occurs. In the present embodiment, the re-intake determination unit 72 uses each air blower 30 from the temperature Tair in a region that is not affected by the outside air cooling by the low temperature air (a region away from the region in which the outside air cooling effect is generated by the low temperature air). When the temperature difference ΔT obtained by subtracting the average suction temperature Tav, which is the average of the air suction temperatures, becomes greater than the specified value Te, it is determined that re-suction has occurred. The specified value Te is set to a value that secures the processing amount of the low temperature medium (the amount of heating of the low temperature medium in each heat exchanger 40) to a certain level or more.

The temperature Tair is, for example, the temperature at a position 20 m to 30 m away from the main heat exchange unit, the air temperature around a control room installed at a position away from the main heat exchange unit, or heat from the ground. The temperature at a height position that is twice or more the vertical dimension of the exchange device 20 is indicated. The air suction temperature of each blower 30 is detected by a temperature sensor 80 provided in the blower chamber 32. The temperature sensor 80 is preferably arranged so as to be located on an extension line of the rotation axis of the fan 34.

The wind direction determination unit 74 determines the direction of the wind blowing toward the heat exchange unit (the first unit component 11 to the fourth unit component 14). In this embodiment, the wind direction determination part 74 determines a wind direction based on 1st average suction temperature Tav1, 2nd average suction temperature Tav2, 3rd average suction temperature Tav3, and 4th average suction temperature Tav4. The first average suction temperature Tav <b> 1 is an average of the air suction temperatures of the blowers 30 of the first unit component 11. The second average suction temperature Tav <b> 2 is the average of the air suction temperatures of the blowers 30 of the second unit component 12. The third average suction temperature Tav3 is an average of the air suction temperatures of the blowers 30 of the third unit component 13. The fourth average suction temperature Tav4 is an average of the air suction temperatures of the blowers 30 of the fourth unit component 14. Specifically, the wind direction determination unit 74 starts from the unit component having the lowest temperature among the first average suction temperature Tav1 to the fourth average suction temperature Tav4 from the center O of the heat exchange unit (perpendicular to the unidirectional center plane P1). It is determined that it includes a component that is directed to the intersection with the direction center plane P2. The reason why this determination is possible is as follows. That is, when the wind blows toward the heat exchange unit, it flows out from the heat exchanger 40 of the windward device located on the most upstream side among the plurality of heat exchange devices 20 and then flows sideways toward the windward. Since the low-temperature air is returned to the heat exchange unit by the wind, the blower 30 of the windward device is particularly easy to suck the low-temperature air again. For this reason, when wind blows toward the heat exchange unit, the average suction temperature of the unit components including the upwind device is the lowest among the first average suction temperature Tav1 to the fourth average suction temperature Tav4. Therefore, it can be determined that the wind direction includes a component from the unit component including the upwind device toward the center O of the heat exchange unit. The wind direction may be determined with an anemometer.

The control performed by the air volume control unit 76 includes one-way control, orthogonal direction control, orthogonal direction reverse control, and air volume increase control.

One-way control is a one-way control when the re-suction determination unit 72 determines that re-suction has occurred, and the one-way inclination A does not determine that re-suction has occurred. In this control, the rotational speed of each blower 30 is adjusted so that the rotational speed of the blower 30 gradually increases as it becomes larger than the direction inclination A and goes from the one-way leeward device to the one-way windward device. The one-way inclination A is a value obtained by subtracting the number of rotations of the blower 30 of the one-way leeward device from the number of rotations of the blower 30 of the one-way leeward device. It is a value divided by the distance between the rotation axes of each fan 34. However, as the unidirectional inclination A, a rotational speed difference obtained by subtracting the rotational speed of the blower 30 of the unidirectional leeward device from the rotational speed of the blower 30 of the unidirectional leeward device may be used. The one-way upwind device is the heat exchange device 20 that is located on the furthest upstream side in one direction with respect to the wind direction determined by the wind direction determination unit 74 among the plurality of heat exchange devices 20. The one-way leeward device is the heat exchange device 20 that is located on the most leeward side in one direction with respect to the wind direction determined by the wind direction determination unit 74 among the plurality of heat exchange devices 20.

In the present embodiment, the air volume control unit 76 performs one-way control until the temperature difference ΔT becomes equal to or less than a specified value Te within a range where the one-way inclination A is less than or equal to a preset one-way maximum value Amax. Rotation of each fan 30 so that the direction inclination A becomes larger than the one-way inclination A in the steady state and the rotation speed of the blower 30 gradually increases from the one-way leeward device toward the one-way upwind device. Control to adjust the number. The one-way maximum value Amax is obtained by subtracting the minimum value of the rotation speed of the blower 30 of the one-way leeward device from the maximum value of the rotation speed of the blower 30 of the unidirectional leeward device. It is the value divided by the distance to the device. The maximum value and the minimum value of the blower 30 depend on the rating of the blower 30 (variable range of the rotation speed of the motor 36).

Here, the contents of the one-way control will be described with reference to FIG. FIG. 4 shows a case where wind is blowing to the heat exchange unit along one direction (from the right side to the left side of the heat exchange unit) and the re-suction determination unit 72 determines that re-suction has occurred. 2 shows an example of a state after the air volume control unit 76 performs the one-way control. In the example of FIG. 4, the heat exchange device 20 located on the most windward side of the first unit component 11 and the heat exchange device 20 located on the most windward side of the second unit component 12 are respectively “one-way wind”. It corresponds to “upper device”. The heat exchange device 20 located on the most leeward side of the third unit component 13 and the heat exchange device 20 located on the most leeward side of the fourth unit component 14 respectively correspond to “one-way leeward devices”. To do. As shown in FIG. 4, when the air volume control unit 76 performs one-way control, the rotational speed of each blower 30 gradually increases from the leeward side toward the windward side. In addition, the number shown in each air blower 30 in FIG. 4 is the rotation speed of the motor 36. Further, it is assumed that the rotation speeds of the motors 36 when the air volume control unit 76 is not performing the one-way control are all 100%, for example.

It is preferable that the air volume control unit 76 adjust the rotation speed of each blower 30 so that the average rotation speed of all the blowers 30 is 100%.

In the orthogonal direction control, when the re-suction determination unit 72 determines that re-suction has occurred, the orthogonal direction inclination B becomes larger than the normal direction orthogonal direction inclination B, and the orthogonal direction leeward device makes an orthogonal direction. It is control which adjusts the rotation speed of each air blower 30 so that the rotation speed of the air blower 30 becomes large gradually as it goes to an upwind apparatus. The orthogonal inclination B is a value obtained by subtracting the rotational speed of the blower 30 of the orthogonal leeward device from the rotational speed of the blower 30 of the orthogonal leeward device as a distance between the orthogonal leeward device and the orthogonal leeward device. It is the value divided. However, as the orthogonal direction inclination B, a rotational speed difference obtained by subtracting the rotational speed of the blower 30 of the orthogonal leeward device from the rotational number of the blower 30 of the orthogonal leeward device may be used. The orthogonal direction upwind device is the heat exchange device 20 that is located on the most upwind side in the orthogonal direction with respect to the wind direction determined by the wind direction determination unit 74 among the plurality of heat exchange devices 20. The orthogonal direction leeward device is the heat exchange device 20 that is located on the most leeward side in the orthogonal direction with respect to the wind direction determined by the wind direction determination unit 74 among the plurality of heat exchange devices 20.

In the present embodiment, as the orthogonal direction control, the air volume control unit 76 is orthogonal until the temperature difference ΔT is equal to or greater than a specified value Te within a range where the orthogonal direction inclination B is less than or equal to a preset orthogonal direction maximum value Bmax. Rotation of each blower 30 so that the direction inclination B becomes larger than the normal direction orthogonal inclination B and the rotation speed of the blower 30 gradually increases from the orthogonal leeward device toward the orthogonal leeward device. Control to adjust the number. The orthogonal maximum value Bmax is obtained by subtracting the minimum value of the rotational speed of the blower 30 of the orthogonal leeward device from the maximum rotational speed of the blower 30 of the orthogonal leeward device. It is the value divided by the distance to the device.

Here, the content of the orthogonal direction control will be described with reference to FIG. FIG. 5 shows a case where wind is blowing to the heat exchange unit along the orthogonal direction (from the front to the back of the heat exchange unit) and the re-suction determination unit 72 determines that re-suction has occurred. 2 shows an example of a state after the air volume control unit 76 performs the orthogonal direction control. In the example of FIG. 5, each heat exchange device 20 of the second unit component 12 and each heat exchange device 20 of the fourth unit component 14 correspond to “orthogonal upwind devices”, respectively, and the first unit component 11 Each heat exchange device 20 and each heat exchange device 20 of the third unit component 13 correspond to an “orthogonal leeward device”. As shown in FIG. 5, when the air volume control unit 76 performs the orthogonal direction control, the rotation speed of each blower 30 gradually increases from the leeward side toward the windward side. Also in FIG. 5, it is assumed that the rotation speeds of the motors 36 when the air volume control unit 76 is not performing the orthogonal direction control are all 100%, for example.

Subsequently, the control of the air volume control unit 76 in the case where the wind includes both a component parallel to one direction and a component parallel to the orthogonal direction will be described with reference to FIG. FIG. 6 shows the flow rate control when it is determined that re-suction has occurred by the re-suction determination unit 72 because wind is blowing from the front right side of the heat exchange unit toward the left side of the back side. An example of a state after the unit 76 performs one-way control and orthogonal direction control is shown. In the example of FIG. 6, the heat exchange device 20 located on the most windward side of the first unit component 11 and the heat exchange device 20 located on the most windward side of the second unit component 12 are respectively “one-way wind”. It corresponds to “upper device”. The heat exchange device 20 located on the most leeward side of the third unit component 13 and the heat exchange device 20 located on the most leeward side of the fourth unit component 14 respectively correspond to “one-way leeward devices”. To do. Further, each heat exchange device 20 of the second unit component 12 and each heat exchange device 20 of the fourth unit component 14 correspond to “orthogonal upwind devices”, and each heat exchange of the first unit component 11. The heat exchange devices 20 of the device 20 and the third unit component 13 respectively correspond to “orthogonal leeward devices”. As shown in FIG. 6, when the air volume control unit 76 performs both the one-way control and the orthogonal direction control, the rotational speed of each blower 30 is increased from the leeward side to the windward side in both the one-way direction and the orthogonal direction. It grows gradually as you go. In this example, the air volume control unit 76 is configured so that the rotational speed of each of the blowers 30 of the six heat exchange devices 20 arranged along one direction increases monotonically from the leeward side toward the windward side by 10%. The rotation of each blower 30 is adjusted so that the rotation number of each blower 30 of the two heat exchange devices 20 arranged in the orthogonal direction is increased by 10% from the leeward side toward the windward side. The number is adjusted. However, the one-way control is not limited to the control that adjusts the rotation speed of each blower 30 so as to monotonously increase from the leeward side toward the leeward side. In FIG. 6 also, it is assumed that the rotational speeds of the motors 36 when the air volume control unit 76 is not performing the one-direction control and the orthogonal direction control are all 100%, for example.

In the orthogonal direction reverse control, when the temperature difference ΔT does not become the specified value Te or more even if the orthogonal direction control is performed until the orthogonal direction gradient B reaches the orthogonal direction maximum value Bmax, the orthogonal direction gradient B is the orthogonal value in the steady state. In this control, the rotational speed of each blower 30 is adjusted so that the rotational speed of the blower 30 becomes gradually smaller as it becomes smaller than the direction inclination B and goes from the orthogonal leeward device toward the orthogonal leeward device.

In the present embodiment, the air volume control unit 76 performs the orthogonal direction gradient B as the orthogonal direction reverse control until the temperature difference ΔT is equal to or greater than the specified value Te within the range where the orthogonal direction gradient B is equal to or greater than the minimum value Bmin in the orthogonal direction. The rotational speed of each blower 30 is adjusted so that the rotational speed of the blower 30 gradually decreases as it goes from the orthogonal leeward device to the orthogonal upwind device. Control. The minimum value Bmin in the orthogonal direction is obtained by subtracting the maximum value of the rotational speed of the blower 30 of the orthogonal leeward device from the minimum value of the rotational speed of the blower 30 of the orthogonal leeward device. The value divided by the distance between.

In the air volume increase control, even if the orthogonal direction reverse control is performed until the orthogonal gradient B becomes the orthogonal minimum value Bmin, the total flow rate of the airflow flowing out from each blower 30 when the temperature difference ΔT does not become the specified value Te or more. It is control which raises the rotation speed of each air blower 30 so that may increase.

Hereinafter, specific control contents of the control unit 70 will be described with reference to FIGS.

When the operation of the heat exchange unit is started, first, the control unit 70 calculates a temperature difference ΔT obtained by subtracting the average suction temperature Tav from the temperature Tair (step S11). Next, the control unit 70 (re-suction determination unit 72) determines whether or not the temperature difference ΔT is larger than the specified value Te (step S12).

As a result, if the temperature difference ΔT is less than the specified value Te (NO in step S12), that is, if the processing amount of the low-temperature medium is ensured more than a certain level, the control unit 70 determines that the temperature difference ΔT is less than the determination value Te2. Whether or not (step S13). The determination value Te2 is a value that is smaller than the specified value Te, and is set to a value that sufficiently secures the processing amount of the low-temperature medium.

If the temperature difference ΔT is less than the determination value Te2 in step S13 (YES in step S13), that is, if the processing amount of the low-temperature medium is sufficiently secured, the control unit 70 sets the rotation speed of each blower 30. Lower (step S14), the process returns to step S11. Thereby, the power required for driving each blower 30 can be reduced while sufficiently securing the amount of processing of the low-temperature medium. On the other hand, if the temperature difference ΔT is greater than or equal to the determination value Te2 in step S13 (NO in step S13), the control unit 70 returns to step S11.

In step S12, if the temperature difference ΔT is equal to or greater than the specified value Te (YES in step S12), that is, if it is determined by the re-inhalation determining unit 72 that the low-temperature air is re-inhaled by each blower 30. The control unit 70 (wind direction determination unit 74) determines the wind direction based on the first average suction temperature Tav1 to the fourth average suction temperature Tav4 (step S15). Subsequently, the control unit 70 determines the positive / negative of the one-way inclination A and the positive / negative of the orthogonal direction inclination B based on the wind direction determined by the wind direction determination unit 74 in step S15 (step S16).

Next, the control unit 70 (air volume control unit 76) performs one-way control. Specifically, the control unit 70 first sets the current temperature difference ΔT as the first temperature difference ΔT1 (step S17). Then, the control unit 70 increases the unidirectional inclination A to the windward side (step S18). Thereafter, the control unit 70 calculates again the temperature difference ΔT (= the temperature Tair−the current average suction temperature Tav) (step S19), and whether or not the temperature difference ΔT is less than the first temperature difference ΔT1, that is, step It is determined whether or not the average suction temperature Tav has increased through S18 (step S20).

As a result, if the temperature difference ΔT is less than the first temperature difference ΔT1 (YES in step S20), the control unit 70 determines whether or not the temperature difference ΔT is equal to or less than a specified value Te (step S21). As a result, if the temperature difference ΔT is equal to or less than the specified value Te (YES in step S21), the control unit 70 returns to step S11. On the other hand, when the temperature difference ΔT is larger than the specified value Te (NO in step S21), the control unit 70 determines whether or not the unidirectional inclination A is the unidirectional maximum value Amax (step S22).

As a result, when the unidirectional inclination A is not the unidirectional maximum value Amax (NO in step S22), that is, when the unidirectional inclination A is less than the unidirectional maximum value Amax, the control unit 70 returns to step S17.

On the other hand, if the one-way inclination A is the one-way maximum value Amax (YES in step S22), or if the temperature difference ΔT is greater than or equal to the first temperature difference ΔT1 in step S20 (NO in step S20), that is, step When the average suction temperature Tav is decreased through S18, the control unit 70 performs orthogonal direction control. Specifically, it is as follows.

The control unit 70 first sets the current orthogonal direction inclination B as the first orthogonal direction inclination B1 (step S23). Next, the control unit 70 sets the current temperature difference ΔT as the second temperature difference ΔT2 (step S24). And the control part 70 enlarges orthogonal direction inclination B to an upwind side (step S25).

Thereafter, the controller 70 again calculates the temperature difference ΔT (= the temperature Tair−the current average suction temperature Tav) (step S26), and determines whether or not the temperature difference ΔT is less than the second temperature difference ΔT2, ie, step It is determined whether or not the average suction temperature Tav has increased through S25 (step S27).

As a result, if the temperature difference ΔT is less than the second temperature difference ΔT2 (YES in step S27), the control unit 70 determines whether or not the temperature difference ΔT is equal to or less than a specified value Te (step S28). As a result, if the temperature difference ΔT is equal to or less than the specified value Te (YES in step S28), the control unit 70 returns to step S11. On the other hand, when the temperature difference ΔT is larger than the specified value Te (NO in step S28), the control unit 70 determines whether or not the orthogonal direction gradient B is the orthogonal direction maximum value Bmax (step S29).

As a result, if the orthogonal direction inclination B is not the orthogonal direction maximum value Bmax (NO in step S29), that is, if the orthogonal direction inclination B is less than the orthogonal direction maximum value Bmax, the control unit 70 returns to step S24.

On the other hand, when the orthogonal direction inclination B is the orthogonal direction maximum value Bmax (YES in step S29), the control unit 70 performs air volume increase control. Specifically, the control unit 70 increases the rotation number at an equal ratio for each of the blowers 30 that can increase the rotation number (step S30), and returns to step S11.

In step S27, when the temperature difference ΔT is equal to or larger than the second temperature difference ΔT2 (NO in step S27), that is, when the average suction temperature Tav is decreased through step S25, the control unit 70 is inclined in the orthogonal direction. It is determined whether or not B is the orthogonal direction maximum value Bmax (step S31).

As a result, when the orthogonal direction inclination B is not the orthogonal direction maximum value Bmax (NO in step S31), the control unit 70 returns to step S24. On the other hand, when the orthogonal direction inclination B is the orthogonal direction maximum value Bmax (YES in step S31), the control unit 70 performs orthogonal direction reverse control. Specifically, it is as follows.

The control unit 70 first returns the current orthogonal direction inclination B to the first orthogonal direction inclination B1 (step S32). This is because the orthogonal direction inclination B is reduced earlier. Next, the control unit 70 sets the current temperature difference ΔT as the third temperature difference ΔT3 (step S33). And the control part 70 enlarges orthogonal direction inclination B to the leeward side (step S34).

Thereafter, the control unit 70 again calculates the temperature difference ΔT (= the temperature Tair−the current average suction temperature Tav) (step S35), and whether or not the temperature difference ΔT is less than the third temperature difference ΔT3, that is, step It is determined whether or not the average suction temperature Tav has increased through S34 (step S36).

As a result, if the temperature difference ΔT is less than the third temperature difference ΔT3 (YES in step S36), the controller 70 determines whether or not the temperature difference ΔT is equal to or less than a specified value Te (step S37). As a result, if the temperature difference ΔT is equal to or less than the specified value Te (YES in step S37), the control unit 70 returns to step S11. On the other hand, when the temperature difference ΔT is larger than the specified value Te (NO in step S37), the control unit 70 determines whether or not the orthogonal direction inclination B is the orthogonal direction minimum value Bmin (step S38).

As a result, when the orthogonal direction inclination B is not the orthogonal direction minimum value Bmin (NO in step S38), that is, when the orthogonal direction inclination B is larger than the orthogonal direction minimum value Bmin, the control unit 70 returns to step S33.

On the other hand, when the orthogonal direction inclination B is the minimum value Bmin in the orthogonal direction (YES in step S38), the control unit 70 returns to step S30 and performs air volume increase control.

In step S36, if the temperature difference ΔT is equal to or greater than the third temperature difference ΔT3 (NO in step S36), that is, if the average suction temperature Tav is decreased through step S34, the control unit 70 is inclined in the orthogonal direction. It is determined whether or not B is the minimum value Bmin in the orthogonal direction (step S39).

As a result, when the orthogonal inclination B is not the orthogonal minimum value Bmin (NO in step S39), the control unit 70 returns to step S33. On the other hand, when the orthogonal direction inclination B is the orthogonal direction minimum value Bmin (YES in step S39), the control unit 70 returns the current orthogonal direction inclination B to the first orthogonal direction inclination B1 (step S40), and then the step. Returning to S30, orthogonal direction reverse control is performed.

Next, the operation of this heat exchange unit will be described.

First, the operation of the heat exchange unit main unit is started. The rotation speed of each blower 30 at this time is set to 100%, for example.

When the operation of this unit is started, a downward air flow is formed in each heat exchange device 20, and the low temperature medium is heated by this air flow coming into contact with the heat transfer tube 44. Then, as shown in FIG. 2, the airflow after the heat exchange in the heat exchanger 40 (cold air cooled by contacting the heat transfer tube 44) collides with the ground, and then the side (heat exchange unit). In a direction away from the head).

Here, when the wind blows toward the heat exchange unit, the low-temperature air that flows to the windward side of the airflow that has passed through the heat exchanger 40 is returned to the heat exchange unit by the wind. The blower 30 may suck the cold air again. In this case, the average suction temperature Tav, that is, the heating amount of the low-temperature medium decreases.

In the present embodiment, the air volume control unit 76 performs one-way control when it is determined by the re-suction determination unit 72 that re-suction has occurred. That is, the one-way inclination A is larger than the one-way inclination A in a steady state where it is not determined that the re-inhalation has occurred by the re-intake determination unit 72, and the one-way leeward device changes to the one-way upwind device. The rotational speed of each blower 30 is adjusted so that the rotational speed of the blower 30 gradually increases as it goes. Then, since the flow rate of the airflow (cold air) passing through each heat exchanger 40 gradually increases from the one-way leeward device toward the one-way leeward device, as shown in FIG. Part of the low-temperature air that has passed through 40 flows along the direction from the one-way upwind device to the one-way leeward device. That is, as a whole heat exchange unit, a flow in a direction in which the low-temperature air that has passed through the heat exchanger 40 of the unidirectional leeward device joins the low-temperature air that has passed through the heat exchanger 40 of the unidirectional leeward device is induced. Therefore, since the flow rate of the low-temperature air flowing toward the windward after flowing out from the heat exchanger 40 of the one-way upwind device decreases, the flow rate of the low-temperature air returned to the heat exchange unit side by the wind decreases. Therefore, the re-suction of the low-temperature air by each blower 30 (especially the blower 30 of the one-way upwind device) is suppressed, and thereby the suction temperature of the air by each blower 30 rises.

In the present embodiment, the air volume control unit 76 performs the orthogonal direction control in addition to the one direction control. For this reason, the re-suction of the low temperature air by each air blower 30 can be suppressed more reliably. Specifically, also in the orthogonal direction, a flow in a direction in which a part of the low-temperature air flowing out from the heat exchanger 40 of the orthogonal windward device joins the low-temperature air flowing out of the heat exchanger 40 of the orthogonal windward device is induced. Therefore, re-suction of low temperature air by each blower 30 is suppressed.

Further, in the present embodiment, the re-suction determination unit 72 is configured such that the temperature difference ΔT obtained by subtracting the average suction temperature Tav from the temperature Tair in the region that is not affected by the cooling of the outside air by the low-temperature air is greater than the specified value Te. It is determined that re-suction has occurred. For this reason, it is possible to determine whether or not re-suction has occurred stably, and it is possible to suppress the influence of changes in temperature caused by seasonal changes or the like on the determination of the re-suction determination unit 72. . Specifically, when the suction temperature of the specific blower is locally high by using the average suction temperature Tav instead of the suction temperature of the specific blower as a criterion for determining whether or not re-suction has occurred Incorrect determination due to the temperature difference ΔT can be suppressed, and by using the temperature difference ΔT as the determination criterion, erroneous determination due to fluctuations in the outside air temperature when a specific temperature is used as the determination criterion can be suppressed. .

Further, when the re-suction determination unit 72 determines that re-suction has occurred, the air volume control unit 76 performs unidirectional control prior to the orthogonal direction control until the temperature difference ΔT becomes equal to or less than the specified value Te. The rotation of each blower 30 is such that the one-way inclination A becomes larger than the one-way inclination A in a steady state and the rotation speed of the blower 30 gradually increases from the one-way leeward device toward the one-way upwind device. Control to adjust the number. Therefore, the temperature difference ΔT can be brought closer to the specified value Te more efficiently than when the orthogonal direction control is performed first when re-suction occurs. Specifically, the heat exchanger 40 of the heat exchange device 20 in which the low-temperature air that has flowed out of the heat exchanger 40 of the heat exchange device 20 located on the leeward side is located on the leeward side when the number of the heat exchange devices 20 is larger. Since the air flow toward the low-temperature air that has flowed out from the air is stably formed, it is more efficient to first increase the average suction temperature Tav by performing one-way control in one direction in which more heat exchange devices 20 are arranged. That is, the temperature difference ΔT can be brought close to the specified value Te.

Further, as the unidirectional inclination A increases, the formation of the air flow from the low temperature air flowing out from the heat exchanger 40 of the unidirectional downwind device toward the low temperature air flowing out of the heat exchanger 40 of the unidirectional downwind device becomes stable. As a result, the effect of increasing the average suction temperature Tav is enhanced. Therefore, by increasing the unidirectional gradient A before the orthogonal gradient B, the temperature difference ΔT approaches the specified value Te at an early stage.

This point will be described with reference to FIG. 10 and FIG. FIG. 10 shows the first unit component 11 when the wind of 3 m / s is blown along one direction with respect to the first unit component 11 (three heat exchange devices 20 arranged along one direction). It is a graph which shows the relationship between the rotation speed ratio of each air blower 30, and 1st average suction temperature Tav1. FIG. 11 shows the rotation speed ratio of each blower 30 of the first unit component 11 and the first average suction temperature Tav1 when a wind of 10 m / s is blown along one direction with respect to the first unit component 11. It is a graph which shows the relationship. The rotational speed ratio is the blower 30 of the heat exchange device 20 located on the windward side with respect to the rotational speed of the blower 30 of the central heat exchange device 20 among the three heat exchange devices 20 included in the first unit component 11. Is the ratio of the number of revolutions. The ratio of the rotational speed of the blower 30 of the central heat exchange device 20 to the blower 30 of the heat exchange device 20 located on the leeward side of the three heat exchange devices 20 included in the first unit component 11 is also as follows. The rotation speed ratio is set. As shown in FIGS. 10 and 11, the first average suction temperature Tav1 increases as the rotational speed ratio becomes larger than 1.00, that is, as the unidirectional gradient A increases.

Further, in the present embodiment, the air volume control unit 76 performs the orthogonal direction control when the temperature difference ΔT does not become the specified value Te or less even if the one-way control is performed until the one-way inclination A reaches the one-way maximum value Amax. . In this aspect, since the orthogonal direction control is performed after the unidirectional inclination A reaches the unidirectional maximum value Amax in the unidirectional control, the average suction temperature can be increased efficiently.

Further, as the orthogonal direction control, the air flow control unit 76 increases the orthogonal inclination B to be larger than the normal orthogonal inclination B until the temperature difference ΔT becomes equal to or less than the specified value Te, and is orthogonal to the orthogonal leeward device. Control which adjusts the rotation speed of each air blower 30 so that the rotation speed of the air blower 30 becomes large gradually as it goes to a directional upwind device is performed. Therefore, the average suction temperature is more reliably increased.

Furthermore, the air volume control unit 76 performs the orthogonal direction reverse control when the temperature difference ΔT does not become the specified value Te or less even if the orthogonal direction control is performed until the orthogonal direction gradient B reaches the orthogonal direction maximum value Bmax. Thereby, each blower 30 is configured such that the orthogonal direction inclination B becomes smaller than the normal direction orthogonal direction inclination B, and the rotational speed of the blower 30 gradually decreases from the orthogonal direction leeward apparatus toward the orthogonal direction upwind apparatus. Is adjusted. For this reason, average suction temperature Tav can be raised more reliably. Specifically, since the number of the heat exchangers 20 arranged in the orthogonal direction is smaller than that in one direction, the average suction temperature Tav does not increase even if the inclination B in the orthogonal direction is increased (the temperature difference ΔT is a specified value). In this case, the average suction temperature Tav may be increased by performing the reverse control in the orthogonal direction. Therefore, the rise probability of the average suction temperature Tav increases.

Further, the air volume control unit 76 performs the reverse flow control in the orthogonal direction until the orthogonal direction gradient B reaches the minimum value Bmin in the orthogonal direction. Air volume increase control is performed to adjust the rotational speed of each blower 30 so that the total flow rate increases. For this reason, the fall of the heating amount of the low-temperature medium in each heat exchanger 20 in the state in which re-suction has arisen is suppressed.

Moreover, in this embodiment, the wind direction determination part 74 contains the component which goes to the center O of the said heat exchange unit from the unit component which has the lowest temperature in 1st average suction temperature Tav1 to 4th average suction temperature Tav4. Is determined. In this aspect, it is possible to determine the wind direction only by comparing the average suction temperatures of the unit components 11 to 14.

In addition, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

For example, the re-suction determination unit 72 defines not the temperature difference ΔT obtained by subtracting the average suction temperature Tav from the temperature Tair but the temperature difference obtained by subtracting the highest temperature among the air suction temperatures of the blowers 30 from the temperature Tair. It may be determined that re-suction has occurred when the value Te falls below.

Alternatively, the re-suction determination unit 72 detects the wind direction with an anemometer, and detects the wind direction from the suction temperature of the blower 30 of the leeward device that is located leeward with respect to the wind direction indicated by the anemometer. When the value obtained by subtracting the suction temperature of the blower 30 is equal to or greater than the threshold value, it may be determined that re-suction has occurred.

In addition, the calculation of the one-way inclination A is not a value obtained by subtracting the rotation speed of the blower 30 of the leeward apparatus from the rotation speed of the blower 30 of the windward apparatus, but a blower of the leeward apparatus of the rotation speed of the blower 30 of the windward apparatus A ratio of 30 revolutions may be used. The same applies to the orthogonal direction inclination B.

Further, the heat exchange unit includes an additional unit component arranged so as to be aligned with the first unit component 11 and the second unit component 12 along the orthogonal direction, and a third unit component along the orthogonal direction. It may further include other additional unit components arranged in line with the 13th and fourth unit components 14. In this way, since the number of the heat exchange devices 20 in both the one-direction and the orthogonal directions is three or more, the effect of increasing the average suction temperature Tav by the one-direction control and the orthogonal direction control can be obtained more reliably. . However, the heat exchange unit may be configured by only a single unit component. Further, the unit component may be constituted by two heat exchange devices 20.

Here, the above embodiment will be outlined.

The heat exchange unit of the above embodiment includes at least one unit component and a control unit, and the at least one unit component includes a plurality of heat exchange devices arranged so as to be aligned in one direction. Each heat exchange device has a blower that forms an airflow that flows in the vertical direction, and a heat exchanger that heats the low-temperature medium by exchanging heat between the low-temperature medium having a temperature lower than the atmosphere and the airflow. And the said control part, The re-inhalation determination part which determines whether the re-inhalation by the said air blower of the low-temperature air which flowed out of the said heat exchanger among the said air flows, The wind direction determination part which determines a wind direction, When the re-suction determination unit determines that the re-suction has occurred, the most up-winding in the one direction with respect to the wind direction determined by the wind direction determination unit among the plurality of heat exchange devices The rotational speed of the blower of the one-way upwind device to be installed and the blower of the one-way leeward device located closest to the leeward direction with respect to the wind direction determined by the wind direction determination unit among the plurality of heat exchange devices The one-way inclination represented based on the difference or ratio with the rotational speed is greater than the one-way inclination at the time of steady state where the re-suction determination unit does not determine that the re-suction has occurred, and An air volume control unit that performs one-way control to adjust the rotation speed of each blower so that the rotation speed of the blower gradually increases from the one-way leeward device toward the one-way windward device.

In this heat exchange unit, when it is determined that re-suction has occurred by the re-suction determination unit, the one-way inclination becomes larger than the one-way inclination in the steady state, and the one-way leeward device makes a one-way upwind. The rotational speed of each blower is adjusted so that the rotational speed of the blower gradually increases toward the apparatus. Then, since the flow rate of the airflow (cold air) passing through each heat exchanger gradually increases from the one-way leeward device to the one-way windward device, a part of the low-temperature air that has passed through each heat exchanger is It flows along the direction from the one-way leeward device to the one-way leeward device. That is, as a whole heat exchange unit, a flow is induced in such a direction that the low-temperature air that has passed through the heat exchanger of the unidirectional leeward device joins the low-temperature air that has passed through the heat exchanger of the unidirectional leeward device. Therefore, since the flow rate of the low-temperature air flowing toward the windward after flowing out of the heat exchanger of the one-way upwind device decreases, the flow rate of the low-temperature air returned to the heat exchange unit side by the wind decreases. Therefore, the re-suction of the low temperature air by each blower (especially the blower of the one-way upwind device) is suppressed, and thereby the suction temperature of the air by each blower increases.

In this case, the at least one unit component includes a first unit component and a second unit component arranged so as to be aligned along an orthogonal direction orthogonal to the one direction, and the air volume control unit includes: When the re-suction determination unit determines that the re-suction has occurred, the orthogonal position that is located on the most windward side in the orthogonal direction with respect to the wind direction determined by the wind direction determination unit among the plurality of heat exchange devices The rotational speed of the blower of the directional windward device and the rotational speed of the blower of the orthogonal leeward device that is located closest to the leeward side in the orthogonal direction with respect to the wind direction determined by the wind direction determination unit among the plurality of heat exchange devices An orthogonal inclination expressed based on the difference or ratio of the above becomes greater than the orthogonal inclination in the steady state, and the orthogonal direction from the orthogonal leeward device It is preferable to further carry out the orthogonal direction control for adjusting the rotational speeds of the blowers gradually as the rotational speed of the blower is increased toward the windward unit.

In this way, it is possible to achieve both an increase in the amount of heating of the low-temperature medium and suppression of re-suction of low-temperature air by each blower. Specifically, since the low-temperature medium is heated in each heat exchanger of the first unit component and the second unit component, the amount of heating of the low-temperature medium increases, and also in the orthogonal direction, the orthogonal upwind device As a part of the low-temperature air that flows out from the heat exchanger in the cross direction is combined with the low-temperature air that flows out from the heat exchanger of the orthogonal leeward device, re-suction of the low-temperature air by each blower is suppressed .

Further, in this case, the re-suction determination unit is configured such that a temperature difference obtained by subtracting an average suction temperature, which is an average of the air suction temperatures of each blower, from a temperature in a region not affected by the cooling of the outside air by the low-temperature air. It is preferable to determine that the re-suction has occurred when the value becomes larger.

In this way, it is possible to determine whether or not re-suction has occurred stably, and to suppress the influence of changes in temperature caused by seasonal changes and the like on the determination of the re-suction determination unit Can do. Specifically, when the suction temperature of the specific blower is locally high by using the average suction temperature instead of the suction temperature of the specific blower as a criterion for determining whether or not re-suction has occurred, etc. It is possible to suppress misjudgment caused by the temperature difference, and by using the temperature difference as a judgment criterion, it is possible to suppress erroneous judgment caused by fluctuations in the outside air temperature when a specific temperature is used as the judgment standard. .

In addition, the number of the heat exchange devices included in each unit component is set to be larger than the number of the unit components, and the re-suction determination unit causes the re-suction to occur in the air volume control unit. The one-way inclination is larger than the one-way inclination in the steady state until the temperature difference becomes the specified value or less as the one-way control before the orthogonal direction control. It is preferable to perform control to adjust the rotational speed of each blower so that the rotational speed of the blower gradually increases from the one-way leeward device toward the one-way windward device.

In this way, the temperature difference can be brought closer to the specified value more efficiently than when the orthogonal direction control is performed first when re-suction occurs. Specifically, when the number of heat exchange devices is larger, the low temperature air that has flowed out of the heat exchanger of the heat exchange device located on the leeward side flows out of the heat exchanger of the heat exchange device that is located on the leeward side. The airflow toward is easily formed. Therefore, it is possible to increase the average suction temperature more efficiently, that is, to bring the temperature difference closer to the specified value, by performing the one-way control for one direction in which more heat exchange devices are arranged first.

In this case, the air flow control unit performs the orthogonal direction control when the temperature difference does not become the specified value or less even if the one-way control is performed until the one-way inclination reaches a preset one-way maximum value. It is preferable to carry out.

In this way, since the orthogonal direction control is performed when the unidirectional inclination reaches the maximum value in one direction in the unidirectional control, the average suction temperature can be increased efficiently.

Further, in the heat exchange unit, the flow rate control unit, as the orthogonal direction control, until the temperature difference becomes equal to or less than the specified value, the orthogonal direction inclination becomes larger than the orthogonal direction inclination during the steady state, And it is preferable to perform control which adjusts the rotation speed of each fan so that the rotation speed of the said fan may become large gradually as it goes to the said orthogonal direction windward apparatus from the said orthogonal direction leeward apparatus.

This will increase the average suction temperature more reliably.

In this case, when the temperature difference does not become equal to or less than the specified value even if the orthogonality control is performed until the inclination in the orthogonal direction reaches a preset orthogonal direction maximum value, the air flow control unit, the orthogonal direction The rotation speed of each blower is set so that the inclination becomes smaller than the normal direction inclination at the time of the steady state, and the rotation speed of the blower gradually decreases from the orthogonal direction leeward device toward the orthogonal direction upwind device. It is preferable to perform the orthogonal direction reverse control to be adjusted.

In this way, the average suction temperature can be increased more reliably. Specifically, since the number of heat exchangers arranged in the orthogonal direction is smaller than that in one direction, the average suction temperature does not increase even if the inclination in the orthogonal direction is increased (the temperature difference does not approach the specified value). ) In some cases, the average suction temperature may be increased by performing the orthogonal direction reverse control. Therefore, the average suction temperature rises more reliably.

Further, the air flow control unit flows out from each blower when the temperature difference does not become the specified value or less even if the orthogonal direction reverse control is performed until the orthogonal direction inclination becomes a preset orthogonal direction minimum value. It is preferable to perform air volume increase control that adjusts the rotational speed of each blower so that the total flow rate of the air flow increases.

In this way, a decrease in the heating amount of the low-temperature medium in each heat exchanger in a state where re-suction occurs is suppressed.

In the heat exchange unit, the at least one unit component further includes a third unit component and a fourth unit component arranged so as to be aligned along the orthogonal direction, and the third unit component Are arranged to be adjacent to the first unit component in the one direction, and the fourth unit component is arranged to be adjacent to the second unit component in the one direction, The said wind direction determination part is 1st average suction temperature which is the average of the suction temperature of the air by each fan of a 1st unit component, and 2nd average suction which is the average of the suction temperature of the air by each fan of a 2nd unit component Temperature, third average suction temperature, which is the average of the air suction temperature by each blower of the third unit component, and empty by each blower of the fourth unit component It is judged that the wind containing the component which goes to the center of the said heat exchange unit is blowing from the place where the unit component which has the lowest average suction temperature in the 4th average suction temperature which is the average of the suction temperature of this is blowing May be.

In this way, it is possible to determine the wind direction only by comparing the average suction temperature of each unit component. Specifically, when the wind blows toward the heat exchange unit, each blower of the unit component (unit component including the windward device) located on the most windward side among the unit components is It is easy to re-inhale the low-temperature air returned to the heat exchange unit side by wind after flowing out from the heat exchanger toward the side. For this reason, when wind blows toward the heat exchange unit, the average suction temperature of the unit components including the windward device is the lowest. Therefore, it can determine with a wind direction including the component which goes to the center of the said heat exchange unit from the unit component containing an upwind apparatus.

Alternatively, the wind direction determination unit may determine the wind direction with an anemometer.

In the heat exchange unit, the at least one unit component further includes an additional unit component arranged so as to be aligned with the first unit component and the second unit component along the one direction. The number of the heat exchange devices included in each unit component is preferably set larger than the number of the unit components.

In this way, since the number of heat exchange devices arranged in both the one direction and the orthogonal direction is 3 or more, the effect of increasing the average suction temperature by the one direction control and the orthogonal direction control can be obtained more reliably.

Claims

A heat exchange unit,
At least one unit component;
A control unit,
The at least one unit component has a plurality of heat exchange devices arranged in a line along one direction,
Each heat exchange device
A blower that forms an airflow flowing in the vertical direction;
A heat exchanger that heats the low-temperature medium by exchanging heat between the low-temperature medium lower than the atmosphere and the airflow;
The controller is
A re-suction determination unit that determines whether or not re-suction by the blower of low-temperature air that has flowed out of the heat exchanger out of the air flow occurs;
A wind direction determination unit for determining the wind direction;
When the re-suction determination unit determines that the re-suction has occurred, one of the plurality of heat exchange devices that is located on the most windward side in the one direction with respect to the wind direction determined by the wind direction determination unit The rotational speed of the blower of the directional leeward device and the rotational speed of the blower of the unidirectional leeward device that is located on the most leeward side in the one direction with respect to the wind direction determined by the wind direction determination unit among the plurality of heat exchange devices The one-way inclination expressed based on the difference or ratio is larger than the one-way inclination in a steady state where the re-suction determination unit does not determine that the re-suction has occurred, and the one-way An air volume control unit that performs one-way control to adjust the rotation speed of each blower so that the rotation speed of the blower gradually increases from the leeward device toward the one-way upwind device. .
The heat exchange unit according to claim 1,
The at least one unit component includes a first unit component and a second unit component arranged so as to be aligned along an orthogonal direction orthogonal to the one direction,
When the re-suction determination unit determines that the re-suction has occurred, the air volume control unit is most in the orthogonal direction with respect to the wind direction determined by the wind direction determination unit among the plurality of heat exchange devices. An orthogonal leeward device positioned closest to the leeward side in the orthogonal direction with respect to the rotational speed of the blower of the orthogonal leeward device located on the windward side and the wind direction determined by the wind direction determining unit among the plurality of heat exchange devices. The inclination in the orthogonal direction expressed based on the difference or ratio with the rotational speed of the blower is larger than the inclination in the orthogonal direction at the time of steady state, and is directed from the orthogonal direction leeward device to the orthogonal direction upwind device. The heat exchange unit further performs orthogonal direction control that adjusts the rotational speed of each blower so that the rotational speed of the blower gradually increases according to.
The heat exchange unit according to claim 2,
In the re-suction determination unit, the temperature difference obtained by subtracting the average suction temperature, which is the average of the air suction temperatures of each blower, from the air temperature in the region that is not affected by the cooling of the outside air by the low-temperature air is larger than the specified value. A heat exchange unit that determines that the re-suction sometimes occurs.
The heat exchange unit according to claim 3,
The number of the heat exchange devices included in each unit component is set larger than the number of the unit components,
When the re-suction determination unit determines that the re-suction has occurred, the air volume control unit has the temperature difference equal to or less than the specified value as the one-way control prior to the orthogonal direction control. Until the one-way inclination is larger than the one-way inclination in the steady state, and the rotation speed of the blower gradually increases from the one-way leeward device toward the one-way upwind device. A heat exchange unit that performs control to adjust the rotational speed of the blower.
The heat exchange unit according to claim 4,
The air flow control unit performs the orthogonal direction control when the temperature difference does not become the specified value or less even if the one-way control is performed until the one-way inclination reaches a preset one-way maximum value. Replacement unit.
The heat exchange unit according to claim 5,
The air volume control unit, as the orthogonal direction control, until the temperature difference becomes equal to or less than the specified value, the orthogonal direction inclination becomes larger than the orthogonal direction inclination in the steady state, and from the orthogonal direction leeward device. A heat exchange unit that performs control to adjust the rotational speed of each blower so that the rotational speed of the blower gradually increases toward the orthogonal upwind device.
The heat exchange unit according to claim 6,
The air volume control unit determines that the orthogonal direction inclination is the predetermined value when the temperature difference does not become the specified value or less even if the orthogonal direction control is performed until the orthogonal direction inclination reaches a preset orthogonal direction maximum value. An orthogonal direction in which the rotational speed of each blower is adjusted so that the rotational speed of the blower gradually decreases as it goes from the normal direction leeward device to the orthogonal direction upwind device. A heat exchange unit that performs reverse control.
The heat exchange unit according to claim 7,
If the temperature difference does not fall below the specified value even if the orthogonal direction reverse control is performed until the orthogonal direction inclination reaches a preset orthogonal direction minimum value, the air flow control unit flows out of each blower A heat exchange unit that performs air volume increase control for adjusting the rotational speed of each blower so that the total flow rate of the fan increases.
The heat exchange unit according to any one of claims 2 to 8,
The at least one unit component further includes a third unit component and a fourth unit component arranged so as to be aligned along the orthogonal direction,
The third unit component is disposed adjacent to the first unit component in the one direction,
The fourth unit component is disposed adjacent to the second unit component in the one direction;
The said wind direction determination part is 1st average suction temperature which is the average of the suction temperature of the air by each fan of a 1st unit component, and 2nd average suction which is the average of the suction temperature of the air by each fan of a 2nd unit component Among the temperature, the third average suction temperature that is the average of the air suction temperature by each fan of the third unit component, and the fourth average suction temperature that is the average of the air suction temperature of each fan of the fourth unit component The heat exchange unit which determines that the wind containing the component which goes to the center of the said heat exchange unit is blowing from the place where the unit component which has the lowest average suction temperature is arrange | positioned.
The heat exchange unit according to claim 1,
The said wind direction determination part is a heat exchange unit which determines a wind direction with an anemometer.
The heat exchange unit according to claim 2,
The at least one unit component further includes an additional unit component arranged to line up with the first unit component and the second unit component along the one direction;
The heat exchange unit, wherein the number of the heat exchange devices included in each unit component is set larger than the number of the unit components.
The heat exchange unit according to claim 1,
In the re-suction determination unit, the temperature difference obtained by subtracting the average suction temperature, which is the average of the air suction temperatures of each blower, from the air temperature in the region that is not affected by the cooling of the outside air by the low-temperature air is larger than the specified value. A heat exchange unit that determines that the re-suction sometimes occurs.