JP2005265340A - Plant building air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plant building air conditioning system which is highly reliable and can always obtain appropriate temperature control.
SOLUTION: In a thermal power plant building 100 having a space H in the attic of the third floor of the A floor, the B floor, and the C floor, a ventilation opening having an electric damper on each floor of A, B, C 1 to 6 are provided, and the air handling units 18 and 19 for heating and the exhaust fan 22 are provided in the space H. In the summer operation mode, the air handling units 18 and 19 remain stopped, the ventilation openings 1 to 6 are opened, the exhaust fan 22 is stopped according to the room temperature, and the room temperature is maintained by forced ventilation and natural ventilation. In the winter operation mode, the ventilation ports 1 to 6 are closed, and the air handling units 18 and 19 are operated so that the heating is effective and the room temperature is maintained.
[Selection] Figure 1

Description

  The present invention relates to an air conditioning system for heating and ventilation of a plant building, and more particularly to a plant building air conditioning system suitable for an industrial plant in a cold region.

  For example, in an industrial plant such as a thermal power plant, there are various devices that generate heat, such as turbines, control panels, pumps, piping, etc. in the building, and if left unattended, the temperature in the building rises in summer. Resulting in.

  Therefore, in such a case, conventionally, the building is ventilated to remove heat, the building is kept within the design temperature range, and the devices in the building that are vulnerable to high temperatures, such as electrical devices, are kept from being hot. I try to protect it.

  At this time, in an area where heating is not required, a ventilation system using a ventilation port and an exhaust fan is generally employed, and ventilation and heat removal are performed throughout the year.

  On the other hand, in cold districts, there is a risk that piping will freeze due to the inflow of cold air during the winter season. For this reason, in general, ventilation openings are not installed, and the air handling unit equipped with a heat exchanger and air supply fan is exhausted. A heating and ventilation system with a fan is used.

  However, in this cold region, air supply and ventilation fans are used for ventilation and heat removal in the summer, and air supply and exhaust fans are used for heating and ventilation in the winter. (Electric power) is larger than that in an area where heating is not required.

  Therefore, a ventilation system that uses a self-ventilated damper device that operates when the temperature in the heat storage space exceeds the set temperature and ventilates the heat storage space in the building only at high temperatures has been known ( For example, see Patent Document 1.)

  In this conventional ventilation system, the self-ventilated damper device is automatically opened at high temperatures such as in summer, and the self-ventilated damper device is kept closed when the temperature is lower than the set temperature in winter.

Therefore, according to the ventilation system described above, ventilation in the heat storage space is automatically given at high temperatures such as summer, and cold air is automatically prevented from being drawn from outside air at low temperatures such as winter. As a result, it is possible to improve the comfort of the living space in the building and to lighten the driving power.
JP 7-12379 A

  The above prior art uses a vent opening that can be opened and closed according to the temperature in the heat storage space, so it is possible to reduce the driving power in summer and prevent the inflow of cold air in the winter. Since the accidental state cannot be monitored, there is a risk that the response will be delayed when the damper fails.

  Moreover, in the above prior art, the ventilator opening / closing control at room temperature only operates in a nearby atmosphere state. Therefore, in industrial plant buildings where there are many devices that serve as heating elements, the dampers are locally opened and closed by themselves. There is a possibility that cold inflow in winter cannot be prevented appropriately.

  An object of the present invention is to provide a plant building air-conditioning system that is highly reliable and can always obtain appropriate temperature management.

  In the plant building air conditioning system that maintains the temperature in the building by ventilation with an exhaust fan and heating with an air handling unit, the above-described object is a movable that opens and closes by electric operation at a ventilation port that communicates the building with outside air. Equipped with a damper, provided with central control means for controlling the exhaust fan, the air handling unit and the movable damper in each of a summer operation mode and a winter operation mode, and in the summer operation mode, the exhaust fan operation control and the The temperature of the building is controlled by opening / closing control of the ventilation port by a movable damper. In the winter operation mode, the ventilation port is closed by the movable damper, and the temperature of the building is controlled by operation control of the air handling unit. This is accomplished in a controlled manner.

  At this time, switching between the summer operation mode and the winter operation mode by the central control unit is executed according to the outside air temperature, and when the outside air temperature is equal to or higher than a preset mode switching temperature, the summer operation mode is set. When the temperature is lower than the mode switching temperature, the above object can be achieved even when the winter operation mode is set.

  Similarly, at this time, the temperature control in the building in the summer operation mode may be given by opening control of the ventilation port by the movable damper and natural ventilation by stopping the operation of the exhaust fan. Can be achieved.

  Further, at this time, the exhaust fan start permission condition is that the opening / closing control of the ventilation port by the movable damper is open in the summer operation mode, and the air handling unit is operating in the winter operation mode. Even if at least one of them is given as an interlock, the above object can be achieved.

  According to the above means, it is possible to centrally monitor and control equipment necessary for heating and ventilation. And this opens and closes the ventilation air according to the outside air temperature, opens the ventilation air when the outside air temperature is higher than the set temperature, reduces the driving power by entering the natural ventilation state, and opens the ventilation air when the air temperature is lower than the set temperature. By securing the closed heating, it is possible to prevent freezing of the piping and the like due to the inflow of cold air.

  For this reason, the above-described means includes, for example, a central control device, a ventilator capable of opening and closing control, an air handling unit including a heat exchanger and an air supply fan, an exhaust fan, an indoor temperature detector, and an outside air temperature detector. . The central control unit monitors and controls the above-described devices and temperature detectors. At this time, the central control unit can be operated by a program built in the central control unit, and the following control can be executed.

  In the central control unit, a mode switching temperature for switching between the summer operation mode and the winter operation mode and an exhaust set temperature for starting the exhaust fan can be set.

  The summer operation mode and the winter operation mode are automatically switched based on the mode switching temperature. When the outside air temperature (measured value of the outside air temperature detector) is equal to or higher than the mode switching temperature, the summer operation mode and the mode switching temperature are If it is less, the winter driving mode is selected.

  First, in the summer operation mode, the ventilation opening is opened and the air handling unit is stopped. On the other hand, in the winter operation mode, the ventilation chamber is closed and the air handling unit is operated.

  At this time, the central control unit displays the operation mode, the outside air temperature, the room temperature (measured value of the indoor temperature detector), the operation state of each device, and the failure alarm.

  The exhaust fan is automatically started and stopped based on the exhaust set temperature, starts when the room temperature rises above the exhaust set temperature in the stopped state, and when the room temperature falls below the exhaust set temperature in the operating state To stop.

  Due to the interlock of the central control unit, it is set that the ventilation fan is open in the summer operation mode and the air handling unit is operating in the winter operation mode as the start permission condition of the exhaust fan. To prevent.

  According to the present invention, it is possible to provide a plant building air conditioning system that is highly reliable and that can always obtain appropriate temperature management.

  Hereinafter, the plant building air conditioning system by this invention is demonstrated in detail by embodiment of illustration.

  1 and 2 show the present invention in a building 100 of a thermal power plant, for example, having a space H as an air conditioner installation space in the attic, which is a three-story building of floors A, B, and C, as a plant building. Therefore, although not shown in the figure, for example, a turbine generator as a main machine is installed on the A floor, and condensers are installed on the B and C floors. Various auxiliary machines such as pumps and pumps will be installed.

  Here, FIG. 1 shows the state of each device in the summer operation mode, and FIG. 2 shows the state of each device in the winter operation mode. Is connected to the B floor, the B floor to the A floor, and the A floor to the space H. In these drawings, the arrows represent the air flow.

  First, on the A floor, vents 1 and 2 and room temperature (indoor temperature) detectors 7 and 8 are provided. On the B floor, vents 3 and 4 and room temperature detectors 9 and 10 are provided, and C Ventilation ports 5 and 6 and room temperature detectors 11 and 12 are provided on the floor.

  In the space H, air handling units 18 and 19 having outside air inlets 14 and 15 and inside air (room air) inlets 16 and 17 are provided. At this time, ducts are provided from the air handling units 18 and 19. 20 and 21 are provided through the C floor.

  Further, two exhaust fans 22 communicating with the outside air from the space H are installed in the attic of the building 100, and outside temperature detectors 23 and 24 are installed outside the building 1.

  Here, further, a central control device 25 is installed on the A floor, and a microcomputer (computer) in which a predetermined program is stored is provided. And the temperature detected with the above-mentioned various temperature detectors is taken into this microcomputer, and based on the result processed by the above-mentioned program, the above-mentioned opening and closing of the various ventilation openings 1-6, the air handling unit 18, 19, and the operation of the exhaust fan 22 is controlled.

  Therefore, each of the ventilation ports 1 to 6 and each of the intake ports 14 to 17 includes a rotary vane type movable damper that opens and closes by an electric operation, and is controlled to be opened and closed by the central controller 25. . Here, the ventilation openings 1 to 6 are depicted as being open in FIG. 1 and are depicted as being closed in FIG.

  Next, the air handling units 18 and 19 will be described. Each of the air handling units 18 and 19 is unitized by a housing divided into a mixing chamber 30 and a fan chamber 31, as shown in FIG. At this time, the mixing chamber 30 and the fan chamber 31 are disposed adjacent to each other with the air filter 32 interposed therebetween, and communicated via the air filter 32.

  First, the mixing chamber 30 is provided with the outside air inlets 14 and 15 and the inside air inlets 16 and 17 so as to be able to communicate with the outside air via the outside air inlets 14 and 15. , 17 to communicate with the A floor.

  Next, the fan chamber 31 is provided with a heat exchanger 33 and an air supply fan 34. The ducts 20 and 21 are communicated with the air supply port of the air supply fan 34, whereby the air taken in from the mixing chamber 30 via the air filter 32 and passed through the heat exchanger 33 is supplied to the air supply fan. 34 is supplied to each duct 20, 21.

  At this time, a local control panel 35 provided with a PLC (programmable controller) is installed in the mixing chamber 30, whereby the supply air set temperature and the minimum damper opening degree of the outside air intakes 14, 15, that is, the ventilation chamber. The opening required to secure the minimum outside air intake amount can be set.

  Next, FIG. 4 is an example of an operation display panel provided in the central controller 25. In the figure, the air handling units # 1, # 2 are the operation buttons of the air handling units 18, 19, and the exhaust fan # 1, # 2 is an operation button for the two exhaust fans 22, and ventilation ports # 1 to # 6 are operation buttons for the ventilation ports 1 to 6, respectively.

  As shown in the left side of FIG. 4, the operation display panel first includes an outside air temperature display unit (a) given by the measured values of the outside air temperature detectors 23 and 24, and a room temperature (room temperature detector 7 Display unit (b), automatic / manual operation selector switch installation unit (c), emergency stop button installation unit (d), operation / stop switch of air handling units 18 and 19, respectively. The fault alarm display lamp installation section (e), and the exhaust fan 22 operation / stop switch and the respective fault alarm display lamp installation sections (f) are provided.

  Also on the right side, the display part (g) for each operation mode of the summer operation mode and the winter operation mode, the open / close switch of the ventilation rods 1 to 6 and the installation part of each failure alarm display lamp (h ) Is provided.

  At this time, the operation selector switch of the installation section (c), the emergency stop button of the installation section (d), the air handling units 18 and 19 of the installation section (e), the operation / stop switch of the installation section (f), and the installation section The open / close switch in (h) also serves as a status display, and lights up in green for “run” and “open” and red in “stop” and “close”.

  Next, the operation of this embodiment will be described. Here, in the system according to this embodiment, at the start of operation, first, a temperature (mode switching temperature) for switching the operation mode to the summer operation mode and the winter operation mode, and a temperature (setting) for starting the exhaust fan 22 are set. It is necessary to set the exhaust temperature) in the microcomputer of the central controller 25.

  For this reason, although not shown in the figure, the central control unit 25 is provided with a panel having a numeric keypad for setting constants and a numerical display unit, for example, and the user can start the system operation or at any point in time. Necessary items such as the above temperature can be input to the microcomputer.

  Of the temperatures to be set at this time, first, the mode switching temperature differs depending on the design conditions of the plant to which this system is applied, but from the standpoint of preventing the freezing of the damper and the local freezing of the pipe. It is desirable to set the temperature at from 15 ° C to 15 ° C.

  At this time, if the operation mode is frequently switched in a short time, it is not preferable for the operation of the equipment, so that the operation mode of the switched summer or winter is maintained for a certain time by the timer function or the like. The control is applied.

  Next, the exhaust set temperature also varies depending on the design conditions of the plant, but from the standpoint of preventing abnormally high temperatures over time, it is about 5 ° C. lower than the temperature determined by the maximum allowable design conditions of the plant. It is desirable to set, so set to such a temperature.

  Also at this time, since it is not preferable for the operation of the fan that the exhaust fan 22 repeatedly starts and stops in a short time, the control such as maintaining either the operation or the stop state for a certain period of time by the timer function or the like. Has been applied.

  At this time, the indoor temperature detectors 7 to 12 are appropriately disposed in the area of the floor where heat is generated, and the central control unit 25 displays the maximum value as room temperature among them, and the maximum value is exhausted. Used for start / stop control of the fan 22.

  The outside air temperature detectors 23 and 24 are appropriately arranged in each direction around the building 100, and the central control unit 25 sets and displays the lowest temperature as the outside air temperature among them, and switches the lowest value to the operation mode. Used for control.

  Once the mode switching temperature and the exhaust set temperature have been set, the system is ready for operation, so the operation is started here. At this time, the “automatic” button on the operation unit (c) is usually used. Press to select automatic operation. At this time, the "automatic" button is lit in green, indicating that automatic operation is in progress.

  Then, at this time, switching between the summer operation mode and the winter operation mode is automatically performed, and the operation is performed in the summer operation mode when the outside air temperature is equal to or higher than the mode switching temperature, and in the winter season when the outside air temperature is lower than the mode switching temperature. It will operate in the operation mode.

  The air handling units 18 and 19 are automatically operated and stopped, the exhaust fan 220 is activated and stopped, and the vents 1 to 6 are opened and closed automatically. At this time, the air handling unit is operated and operated in the operation unit (e). The operation of the stop switch and the operation / stop switch of the exhaust fan of the operation unit (f) is invalidated, and the operation of the open / close switch of the ventilation port of the operation unit (h) is also invalidated. The “open” switch lights in green.

  Therefore, the following description will be made separately for each operation mode.

・ Summer driving mode ・
If the outside air temperature is equal to or higher than the mode switching temperature, the system is automatically switched to the summer operation mode. At this time, both of the air handling units 17 and 18 are stopped. Accordingly, at this time, each “stop” button is lit in red.

  The ventilation ports 1 to 6 are all opened. Accordingly, at this time, the respective “open” indications are lit in green. Here, when switching, the air handling unit 22 is first stopped, and the ventilation port is stopped after the stop. The interlock control of opening 1 to 6 is applied, so that temporary fluctuation of the heating load is prevented.

  At this time, the exhaust fan 22 is automatically started / stopped based on the exhaust set temperature, and is started when the room temperature rises above the exhaust set temperature in the stopped state, and the ventilation fans 1 to 6 are all opened. The room temperature is made to maintain the exhaust set temperature by forced ventilation in which the outside air is forcibly introduced from the ventilation chambers 1 to 6 and discharged from the space H to the outside air.

  Then, when the room temperature falls below the exhaust set temperature, the exhaust fan 22 is stopped, and the outside air is naturally introduced from the ventilators 1 to 6 that are all open, and is discharged from the space H to the outside air. Let the natural ventilation work, keep the room temperature below the exhaust set temperature.

  At this time, it is also possible to individually control the opening and closing of the ventilation rods 1 to 6 so as to obtain temperature control by natural ventilation.

  When the room temperature falls below the exhaust set temperature, the forced ventilation operation by the operation of the exhaust fan 22 and the natural ventilation operation with the exhaust fan 22 stopped are appropriately selected according to the room temperature, and the room temperature sets the exhaust set temperature. It is controlled to maintain.

・ Winter driving mode ・
If the outside air temperature is less than the mode switching temperature, the system is automatically switched to the winter operation mode. At this time, all six ventilation vents 1 to 6 are closed, but the air handling unit 22 is selected according to the room temperature when only one unit is operated or when both units are operated. . Accordingly, each “driving” button is lit in green according to each driving state.

  Here, as described above, the ventilation holes 1 to 6 are all closed at six places. Therefore, at this time, the respective “close” buttons are lit in red. Interlock control of closing 6 and then starting the air handling unit 22 is applied, so that it is possible to prevent the heating load from fluctuating temporarily.

  Here, in both the summer operation mode and the winter operation mode, when the room temperature exceeds the exhaust set temperature, all the two exhaust fans 22 are activated (at this time, the green “operation” When the temperature falls below the exhaust set temperature, all two units are stopped (At this time, the red “Stop” indication lights on each button).

  The above is the case of automatic operation, and this automatic operation is normally selected. Here, for example, in the case of a test operation or failure of the system, the “manual” button is pressed to select manual operation. At this time, the “manual” button is lit in green, indicating that manual operation is selected.

  When this “manual” operation is performed, the open / close switch operations of the ventilation units 1 to 6 and the operation / stop switches of the air handling units 18 and 19 and the exhaust fan 22 can be manually operated individually. Become.

  Specifically, the operator monitors the outside air temperature of the display unit (a) and the room temperature of the display unit (b), opens and closes ventilation vents 1 to 6, and operates the air handling units 18 and 19 and the exhaust fan 22. The stop is individually controlled, and the operation is performed so that the room temperature of the display unit (b) falls within a desired temperature range with respect to the outside air temperature of the display unit (a).

  At this time, in this embodiment, the interlock is incorporated so that the ventilating ports 1 to 6 are open for the activation of the exhaust fan 22 in the summer operation mode. It is designed to prevent negative pressure.

  At this time, since the six ventilation openings and the second exhaust fan can be balanced, the ventilation openings 1 to 6 are taken into account in consideration of the balance when the ventilation holes 1 to 6 at a plurality of places fail. The two exhaust fans 22 can be activated only when all the six locations are normally open.

  And at this time, it is needless to repair immediately about the thing which failure occurred in a damper in ventilation openings 1-6, but the number of normally opened ventilation rods is three or more. In this case, only one exhaust fan 22 can be activated, but it is desirable to provide an interlock that does not activate any one of the exhaust fans 22 or less.

  Next, in this embodiment, the activation of the exhaust fan 22 in the winter operation mode is made a condition that the air handling units 18 and 19 are operating.

  At this time, as in the summer operation mode, the failed air handling unit needs to be repaired immediately, but if the air handling units 18 and 19 are not operating normally, the exhaust fan 22 is also activated. It is desirable to create an interlock that prevents this from occurring.

  By the way, in the case of the above embodiment, there are two air handling units, two exhaust fans, and six ventilation openings. Therefore, there are not many combinations of interlocks in case of the above-mentioned failure. However, the target plant building is large, for example, as shown in FIG. 5, there are four air handling units # 1 to # 4, four exhaust fans # 1 to # 4, and ventilation. When there are twelve mouths from # 1 to # 12, considerably free and fine combinations are possible as described below.

  In other words, only four exhaust fans # 1 to # 4 can be activated only when all 12 vents from # 1 to # 12 are open normally. At this time, the ventilated hole that has failed is repaired immediately. However, when the number of normally open ventilation chambers is 9 or more and 11 or more, only 3 exhaust fans can be activated, and when 6 or more and 8 or less, only 2 units can be activated. An interlock can be established in which only one unit is used when there are three or more and five or less locations, and no unit is activated when there are less than three locations.

  Similarly, the exhaust fan start permission condition in the winter operation mode is that the air handling unit is in operation. At this time, among the air handling units # 1 to # 4, the exhaust of # 1 to # 4 is exhausted. If the same number of fans are not operating normally, an interlock can be established that the exhaust fan will not start. However, in this case, it goes without saying that the air handling unit in which the failure has occurred needs immediate repair, as in the summer operation mode.

  Here, the above-described start permission condition is valid not only for automatic operation but also for manual operation. In this case, the start permission condition of either the above-described summer operation mode or winter operation mode is satisfied. It can be started.

  By the way, in embodiment of FIG. 1 and FIG. 2, when outside temperature is lower than the said mode switching temperature (equivalent to the winter driving mode at the time of automatic operation), even if the operation switch is set to “manual”, the ventilation ports 1 to 6 is controlled so that it cannot be “opened”, so that it is possible to prevent the pipes from freezing at any time.

  In this embodiment, when an unforeseen situation occurs, pressing the emergency stop button in the operation unit (d) in FIG. As with the handling units 18 and 19, the two exhaust fans 22 are stopped and controlled simultaneously.

  By the way, in the case of this embodiment, in the winter operation mode, the outside air taken in from the outside air inlets 14 and 15 and the indoor air taken in from the inside air inlets 16 and 17 are mixed in the mixing chamber 30. After passing through the air filter 32, it is warmed by the heat exchanger 33 and supplied to the rooms on the respective floors through the ducts 20 and 21 by the air supply fan.

  At this time, the adjustment of the warm air temperature by the heat exchanger 33 is performed as the above-mentioned supply air set temperature, the temperature in the mixing chamber 30 given as the measurement value of the mixed air detector 36, and the measurement value of the supply air temperature detector 37. The PLC described above is controlled by calculating the necessary heat amount using the supplied outlet temperature of the air supply fan 34.

  Here, in the temperature adjustment by the heat exchanger 33, as described above, the PLC has already calculated the mixing ratio of the outside air and the indoor circulating air, and the outside air is set so that the temperature of the mixing chamber 30 approaches the supply air set temperature. The damper opening degree of intake roes 14 and 15 and inside air intake ports 16 and 17 is adjusted. Therefore, the heating load required for air handling units 18 and 19 here is reduced.

  As described above, since the temperature is adjusted by the heat exchanger 33, even if the outside air temperature is equal to or higher than the mode switching temperature (corresponding to the summer operation mode during automatic operation), if necessary, the air handling unit 18, There is no problem even if 19 is operated manually.

  Therefore, according to the above embodiment, the effects listed below can be obtained.

  First, since it is possible to monitor and control the state and temperature state of each device from the central control device, it is possible to respond quickly to failures.

  In addition, since the ventilation can be opened and closed based on the outside air temperature and can be controlled so that it cannot be opened in winter, there is no risk of pipe freezing due to the inflow of cold air in winter. This makes it possible to reduce driving power in summer.

  Furthermore, since the exhaust fan can be started and stopped based on the room temperature of an area where heat is generated in the building, local abnormally high temperature generation in the building can be suppressed.

  In addition, when the exhaust fan is started, it can be set as a start permission condition that the ventilation air is open in the summer and the air handling unit is operated in the winter. Can prevent pressure.

It is explanatory drawing when one Embodiment of the plant building air-conditioning system by this invention exists in a summer operation mode. It is explanatory drawing when one Embodiment of the plant building air conditioning system by this invention exists in winter operation mode. It is a detailed block diagram of the air handling unit in one Embodiment of this invention. It is explanatory drawing which shows an example of the operation display board with which the central control apparatus is equipped in one Embodiment of this invention. It is explanatory drawing which shows another example of the operation display board with which the central control apparatus is equipped in one Embodiment of this invention.

Explanation of symbols

1 to 6: Ventilation b) 7 to 12: Indoor temperature detector 14, 15: Outside air inlet 16, 17: Inside air inlet 18, 19: Air handling unit 20, 21: Duct 22: Exhaust fan 23, 24: Outside air temperature Detector 25: Central control device 30: Mixing chamber 31: Fan chamber 32: Air filter 33: Heat exchanger 34: Supply air fan 35: Local control panel 36: Mixed air detector 37: Supply air temperature detector

Claims (4)

In a plant building air conditioning system that maintains the temperature in the building by ventilation with an exhaust fan and heating with an air handling unit,
Equipped with a movable damper that opens and closes by electric operation at the ventilation port that communicates the building with the outside air,
Central control means for controlling the exhaust fan, the air handling unit and the movable damper in each of a summer operation mode and a winter operation mode is provided,
In the summer operation mode, by controlling the operation of the exhaust fan and opening / closing control of the ventilation port by the movable damper, the temperature in the building is controlled,
In the winter operation mode, the plant building air-conditioning system is configured such that the ventilation opening is closed by the movable damper, and the temperature of the building is controlled by operation control of the air handling unit. In the plant building air conditioning system according to claim 1,
Switching between the summer operation mode and the winter operation mode by the central control unit is executed according to the outside air temperature,
When the outside air temperature is higher than the preset mode switching temperature, the summer operation mode is set.
A plant building air-conditioning system characterized in that a winter operation mode is entered when the outside air temperature is lower than the mode switching temperature. In the plant building air conditioning system according to claim 1,
The plant building air conditioning system, wherein the temperature control in the building in the summer operation mode is given by opening control of the ventilation port by the movable damper and natural ventilation by stopping the operation of the exhaust fan. In the plant building air conditioning system according to claim 1,
The exhaust fan activation permission condition is that at least one of the opening / closing control of the ventilation port by the movable damper being open in the summer operation mode and the air handling unit being operated in the winter operation mode is Plant building air conditioning system characterized by being given as an interlock.

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