JP3410083B2 - Air conditioning control method and air conditioning control system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning control method and an air conditioning control system.

[0002]

2. Description of the Related Art In a spent fuel reprocessing facility 1 of a nuclear power plant shown in FIG. 1, radioactive waste is reprocessed through a plurality of steps. At that time, each process is performed in an independent room (C
1 to C4 area) and the pressure inside each room is set lower than the atmospheric pressure in order to prevent leakage of radioactive pollutants to the outside. It should be noted that the pressure difference with the atmosphere is set large in the room in the previous process where high-level radioactive waste is handled.

Exhaust air flow rate control method and differential pressure control method can be considered as methods for maintaining the differential pressure in each chamber at a predetermined value. The air volume control method obtains a predetermined exhaust air volume capable of maintaining the differential pressure in each room within a set range, and controls the opening degree of the exhaust air volume adjustment damper 34 to set the exhaust air volume in each room to a predetermined value. Is. The differential pressure control method controls the opening degree of the exhaust air volume adjustment damper 34 so that the differential pressure in each room falls within a set range.

[0004]

In the exhaust air volume control system, since the differential pressure in each room is not detected, there is a problem that the differential pressure may not be within the set range even if the exhaust air volume is set to a predetermined value. This is because the predetermined exhaust air volume is calculated on the premise of room temperature air, so if the air temperature changes significantly, the differential pressure will largely deviate from the set range even if the exhaust air volume is set to a predetermined value. Is.

On the other hand, the differential pressure control system has a problem that stable control cannot be performed because the differential pressure in a narrow room is detected. For example, opening the door of the room only causes the pressure difference to change rapidly. Also, when controlling each room separately,
Since it is necessary to provide a sensor for each room, there is a problem that a large cost is required. The present invention focuses on the above problems,
Air conditioning control that maintains the differential pressure in multiple rooms within the set range,
An object of the present invention is to provide an air conditioning control method and a system thereof that can be stably performed.

[0006]

In order to achieve the above object, an air conditioning control method according to the present invention is an air conditioning control method for maintaining a differential pressure between a plurality of rooms and the atmosphere within a set range. In order to maintain the differential pressure in each room within a set range, air is supplied to each room with a predetermined supply air volume, and exhaust is performed from each room with a predetermined exhaust air volume to group the plurality of chambers. The exhaust air flow rate is detected in a unitized zone, and the exhaust air flow rate is adjusted so that the exhaust air flow rate becomes a predetermined value in the zone unit, and the differential pressure in the specific chamber in the zone is detected, and the differential pressure is When the pressure is out of the set range, the exhaust air flow rate is adjusted in units of the zones so that the differential pressure falls within the set range.

By controlling the exhaust air flow rate on a zone-by-zone basis, there is no influence of the temporary cause of the differential pressure fluctuation occurring in one chamber. Therefore, stable control can be realized. On the other hand, when the cause of the differential pressure fluctuation that affects all the chambers occurs, or when the cause of the differential pressure fluctuation that occurs in one chamber is extremely large, the differential pressure fluctuation due to these cannot be ignored. Therefore, by performing differential pressure control for one chamber in the zone, the differential pressure in the chamber can be directly returned to within the set range. Therefore, the differential pressure can be maintained within the set range.

Further, the setting ranges of the differential pressures in the respective chambers are different from each other. In the present invention, since the interior of each room is exhausted by a predetermined exhaust air volume in order to maintain the differential pressure in each room within the set range, even if the set range of the differential pressure in each room is different, Air conditioning control for maintaining the differential pressure within the set range can be stably performed.

On the other hand, the air conditioning control system according to the present invention is
An air-conditioning control system for maintaining a differential pressure between a plurality of rooms and the atmosphere within a set range, wherein a predetermined supply air volume is applied to each room to maintain the differential pressure within each room within the set range. An air supply means for supplying air, an exhaust means for exhausting air from each of the chambers by a predetermined exhaust air volume, an exhaust air volume detection means for detecting the exhaust air volume for each zone in which the plurality of chambers are grouped, and the inside of the zone. Differential pressure detection means for detecting the differential pressure in the specific chamber, an exhaust air volume adjustment damper for adjusting the exhaust air volume in the zone unit, and the exhaust air volume detected by the exhaust air volume detection means as a predetermined value in the zone unit. In order to control the opening degree of the exhaust air flow rate adjustment damper, and if the differential pressure detected by the differential pressure detection means is out of the set range, the exhaust air flow rate adjustment damper of the exhaust air flow rate adjustment damper is set to keep the differential pressure within the set range. Opening And configured to have a control unit for performing control. As a result, the air conditioning control for maintaining the differential pressure in each room within the set range can be stably performed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an air conditioning control method and system according to the present invention will be described in detail with reference to the accompanying drawings. It should be noted that what is described below is only one aspect of the embodiment of the present invention, and the present invention is not limited thereto. FIG. 1 shows an explanatory view of an air conditioning control system according to the embodiment. The air conditioning system according to the embodiment,
An air-conditioning control system for maintaining a pressure difference between a plurality of chambers (C1 to C4 areas) with the atmosphere within a set range. A plurality of chambers are grouped together with an air supply unit (11 to 18) for supplying air into each room according to the air flow rate, and an exhaust unit (24 to 35) for exhausting air from each room according to a predetermined exhaust air flow rate. Exhaust air volume detection means 30 for detecting the exhaust air volume in units of zones, and a specific chamber (C3 area) in the zone
A differential pressure detecting means 20 for detecting a differential pressure in the interior, an exhaust air volume adjusting damper 34 for adjusting the exhaust air volume in units of zones,
When the differential pressure detected by the differential pressure detecting means 20 is out of the set range by controlling the opening degree of the exhaust air volume adjusting damper 34 so that the exhaust air volume detected by the exhaust air volume detecting means 30 becomes a predetermined value in each zone. And a control unit 40 that controls the opening degree of the exhaust air volume adjustment damper 34 so that the differential pressure falls within the set range.

The building of the reprocessing facility shown in FIG. 1 has rooms in areas C1 to C4. The C4 area is divided into three small rooms. The setting range of the differential pressure from the atmospheric pressure in each room is 0 to -60 Pa for the C1 area, -80 to -100 Pa for the C2 area, and -120 to -1 for the C3 area.
40Pa and one room in C4 area is -250 to -40
0 Pa and the other two chambers are -220 to -300 Pa. Each room in the C1 to C3 areas is grouped into a first zone, and each room in the C4 area is grouped into a second zone, and air conditioning control is performed in zone units.
The first zone will be described below, but the same applies to the second zone.

Air supply means and exhaust means are provided to maintain the differential pressure in each chamber within a set range. First, the air supply means will be described. As the air supply means, first, an outside air intake 11, an air supply filter 12, and a blower 13 are sequentially provided. Further, the outlet of the blower 13 is connected to the air supply pipe 15 via the closing damper 14. Further, the air supply pipe 15 is branched as needed and is connected to the air supply ports 16, 17, 18 of each room.

Next, the exhaust means will be described. As an exhaust means, first, exhaust ports 26, 27, and 28 having the same diameter are provided in each chamber, and exhaust fans 24 and 25 are provided as needed.
Further, the exhaust pipe 31 connected to each exhaust port 26, 27, 28
Are merged into one for each zone. Further, an exhaust filter 32, an exhaust air volume adjusting damper 34, an exhaust fan 33 and a main exhaust pipe 35 are sequentially provided on the downstream side of the integrated exhaust pipe 31 to enable exhaust to the outside of the facility. As will be described later, exhaust air volume control and differential pressure control are performed by controlling the opening degree of the exhaust air volume adjustment damper 34.

Then, by using the exhaust air volume when the exhaust means of each room is operated as a predetermined exhaust air volume, a predetermined supply air volume that can maintain the differential pressure in each chamber in a sealed state within a set range is calculated or the like. Ask. Then, the air supply ports 16, 17, 18 in each room are provided so that the air can be supplied by the determined predetermined air supply amount.
Set the caliber of. The opening of the exhaust air amount adjusting damper is preferably fixed to the center value (opening 50%) so that the opening can be adjusted in both directions of opening and closing.

On the other hand, one exhaust pipe 31 is provided for each zone.
Exhaust air volume detection means 30 is provided to detect the exhaust air volume. Further, a differential pressure detecting means 20 is provided to detect a differential pressure in the specific chamber (C3 area) in the zone. The differential pressure detecting means 20 forms the differential pressure so that it can be calculated from the measured values of the pressure sensors 21 and 22 installed outside the facility and inside the C3 area, respectively. As the specific room in the zone, the room in which the differential pressure fluctuation is the largest and the frequency is considered to be the largest among the respective rooms in the zone is specified.

Further, a control unit 40 for controlling the opening degree of the exhaust air volume adjustment damper is provided. FIG. 2 shows an explanatory diagram of the control unit 40. The control unit 40 is connected so that detection signals can be input from the exhaust air flow rate detection unit 30 and the differential pressure detection unit 20, and is also connected so that an opening control signal can be output to the exhaust air flow rate adjustment damper 34.

In the control unit 40, the exhaust air flow rate detecting means 30 is provided.
An exhaust air flow rate control unit 42 is formed which receives an exhaust air flow rate detection signal from the device and outputs an opening control signal of the exhaust air flow rate adjustment damper 34 so as to set the exhaust air flow rate to a predetermined value. Further, a differential pressure control unit is formed which receives an input of the differential pressure detection signal from the differential pressure detection means 20 and outputs the opening control signal of the exhaust air volume adjustment damper 34 so that the differential pressure falls within the set range. The differential pressure control unit
When the detected differential pressure is less than or equal to the lower limit of the setting range, the lower differential pressure control unit 44 that controls the differential pressure to be the lower limit value of the setting range, and the detected differential pressure is greater than or equal to the upper limit of the allowable range. In this case, the upper differential pressure control unit 46 is configured to control the differential pressure to be the upper limit of the set range.

Further, a high selector 54 is provided for switching the control signal from the exhaust air volume control unit 42 to the lower differential pressure control unit 44 when the detected differential pressure is below the lower limit of the set range. Further, the low selector 56 is provided which switches the control signal from the high selector 54 to the upper differential pressure control unit 46 when the detected differential pressure is equal to or higher than the upper limit of the set range.

In addition, the initial opening signal output for holding the exhaust air volume adjusting damper at a constant opening for a fixed time immediately after the activation of the air conditioning control system to quickly bring the differential pressure of each chamber within the set range. The part 59 is provided. Further, a startup selector 58 is provided which switches the source of the control signal from the initial opening signal output unit 59 to the row selector 56 after a lapse of a certain time.

An air conditioning control method for maintaining the differential pressures in a plurality of rooms within a set range by using the air conditioning control system configured as described above will be described below. FIG. 3 shows a flowchart of the air conditioning control method according to the embodiment.

First, the control unit 40 is activated. Since the startup selector 58 selects the initial opening signal output unit 59 side for a fixed time immediately after startup, the control unit 40 outputs a signal for holding the opening of the exhaust air volume adjustment damper at the initial value (step 82). The initial value of the opening of the exhaust air volume adjustment damper and the method of determining the constant time to be maintained at the initial value are calculated by calculating the exhaust air volume such that the differential pressure in each room is within the set range after the elapse of the predetermined time. An opening that can realize such an exhaust air volume is determined as an initial value. Next, the air supply means and the exhaust means are activated. Specifically, the blower 13, the exhaust fan 23, and the exhaust fans 24 and 25 are operated. Each room at that time should be closed by closing the door. And after a certain period of time,
The differential pressure in each room is maintained within the set range.

When a certain time has elapsed after the start-up (step 84), the start-up selector 58 selects the control signal from the row selector 56, and the control section 40 outputs the control signal. First, the differential pressure detection means 20 detects the differential pressure in the C3 area (step 86). Specifically, the pressure outside the facility detected by the pressure sensor 21 and C3 detected by the pressure sensor 22.
From the pressure in the area, the differential pressure is detected by calculation. Next, the high selector 54 detects that the detected differential pressure in the C3 area is
It is determined whether the value is equal to or more than the lower limit value (-140 Pa) of the setting range (step 88). If it is at least the lower limit value, the high selector 54 selects the control signal from the exhaust air volume control unit 42. Next, it is determined whether the detected differential pressure in the C3 area is less than or equal to the upper limit value (-120 Pa) of the set range (step 9).
0). If it is less than or equal to the upper limit value, the row selector 56 selects the control signal from the high selector 54. As a result, the exhaust air volume control signal can be output, and the exhaust air volume control unit 4
It becomes possible to control the exhaust air flow rate by 2. It should be noted that an allowable range wider than the set range may be set and the determinations in step 88 and step 90 may be performed. The allowable range of the differential pressure is, for example, −10 to −170 Pa.

In the exhaust air volume control, first, the exhaust air volume detection means 30 detects the exhaust air volume in the exhaust pipe 31 unified for each zone (step 92). Next, the exhaust air volume control unit 42 sets the sum of the predetermined values of the exhaust air volumes of the areas C1 to C3 as the predetermined value in the zone unit, and the PID so that the detected exhaust air volume matches the predetermined value in the zone unit.
Control is performed (step 94). In addition, PID for control operation
By adopting the control operation (proportional integral derivative operation),
It is possible to quickly match the exhaust air volume with the predetermined value.

On the other hand, in step 88, the detected C
The differential pressure within the three areas is the lower limit of the setting range (-140 Pa)
In the following cases, the high selector 54 selects the control signal from the lower differential pressure control unit 44. Since the low selector 56 selects the control signal from the high selector 54, it becomes possible to output the lower differential pressure control signal,
The lower differential pressure control section 44 can control the lower differential pressure.
In the lower differential pressure control, PID control is performed so that the differential pressure in the C3 area detected in step 86 matches the lower limit value (-140 Pa) of the set range (step 94). When the differential pressure becomes equal to or higher than the lower limit of the set range, the exhaust air flow rate control is resumed (step 88 and below).

In step 90, the detected C
The differential pressure within the 3 areas is the upper limit of the setting range (-120 Pa)
In the above case, the row selector 56 selects the control signal from the upper differential pressure control section 46. Accordingly, the upper differential pressure control signal can be output, and the upper differential pressure control section 46 can perform the upper differential pressure control. In the upper differential pressure control, PID control is performed so that the differential pressure in the C3 area detected in step 86 matches the upper limit value (-120 Pa) of the set range (step 98). When the differential pressure becomes equal to or lower than the upper limit of the set range, the exhaust air volume control is restored (step 90).

FIG. 4 shows an example of the differential pressure change due to the upper differential pressure control. Initially, exhaust air volume control is performed, and the differential pressure is -120.
When it becomes Pa or more, it is switched to the upper differential pressure control, and when it becomes -120 Pa or less, it returns to the exhaust air volume control again. Note that the PID control operation (proportional-integral-derivative operation) is adopted as the control operation, so that the exhaust air flow rate can be quickly matched with the target value, as in the constant air flow rate control.

By using the air-conditioning control system according to this embodiment having the above-mentioned structure according to the above-mentioned method, it is possible to maintain the differential pressures in a plurality of rooms within the set range. In this respect, in the conventional differential pressure control method, since the differential pressure in a narrow room is the control target, stable control may not be possible in some cases. For example, only opening the door of the room changes the differential pressure greatly. Further, in the conventional exhaust air flow rate control, the differential pressure in each room is not set as a control target, so that the differential pressure may not be within the set range even if the exhaust air flow rate is set to a predetermined value. For example, since the predetermined value of the exhaust air volume is premised on the air at room temperature, when the temperature of the air changes greatly, the differential pressure largely deviates from the set range even if the exhaust air volume is set to the predetermined value.

However, the air conditioning control method according to the present embodiment controls the exhaust air flow rate in units of zones in which a plurality of chambers are grouped, and only when the differential pressure in the specific chamber within the zone is out of the set range. It is configured to perform pressure control.

If a temporary differential pressure fluctuation cause such as opening / closing of the room door or temperature rise due to indoor equipment occurs in one room, the differential pressure in the room is set in a short time because the cause of fluctuation disappears. Return to within range. Therefore, if the exhaust air flow rate is controlled on a zone-by-zone basis, it will not be affected by such a differential pressure fluctuation. Therefore, stable control can be realized. On the other hand, if the cause of the differential pressure fluctuation that affects all the rooms, such as an increase in atmospheric temperature, or the cause of the differential pressure fluctuation that occurs in one room is extremely large, ignore the differential pressure fluctuation due to these. You cannot do it. Therefore, by performing differential pressure control for one chamber in the zone, the differential pressure in the chamber can be directly returned to within the set range. Therefore, the differential pressure can be maintained within the set range.

Further, with the above structure, it is sufficient to install the exhaust air flow rate detecting means for each zone, and the differential pressure detecting means for a specific one room in the zone, and it is necessary to install these for each room. There is no. Therefore, the installation cost can be reduced.

Further, the air conditioning control method according to the present embodiment is configured such that the air in each room is exhausted with a predetermined exhaust air volume so as to maintain the differential pressure in each room within the set range. Therefore, it is possible to arbitrarily set the differential pressure in each chamber, and it is also possible to set the differential pressure in each chamber in multiple stages and at small intervals. As a result, it is possible to perform air conditioning control corresponding to various reprocessing steps of radioactive waste.

Further, the air conditioning control method according to the present embodiment is configured such that the opening degree of the exhaust air volume adjustment damper is maintained at the initial value for a certain period of time after the air conditioning control system is activated. This allows
The unstable state immediately after startup can be resolved in a short time and the differential pressure can be kept within the set range. Therefore, no adjustment is required at the time of test operation, and the cost can be reduced.

[0033]

The present invention provides an air conditioning control method for maintaining a pressure difference between the atmosphere in a plurality of rooms within a set range, and a predetermined air supply amount to maintain the pressure difference in each room within the set range. Performing air supply to each room and performing exhaust from each room by a predetermined exhaust air volume, detecting the exhaust air volume in units of zones in which the plurality of chambers are grouped, and measuring the exhaust air volume in units of the zones. The exhaust air volume is adjusted to a predetermined value, the differential pressure in the specific chamber in the zone is detected, and if the differential pressure is outside the set range, the differential pressure is set within the set range. Since the exhaust air volume is adjusted in units of the zones, it is possible to stably perform the air conditioning control for maintaining the differential pressures in the plurality of rooms within the set range.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an air conditioning control system according to an embodiment.

FIG. 2 is an explanatory diagram of a control unit.

FIG. 3 is a flowchart of an air conditioning control method according to the embodiment.

FIG. 4 is an example of a differential pressure change due to upper differential pressure control.

[Explanation of symbols]

11 ………… Outside air intake, 12 ………… Air supply filter,
13 ……… Blower, 14 ……… Closed damper, 15 ………
Air supply piping, 16, 17, 18 ......... Air supply port, 20 ...
Differential pressure detecting means 21, 22 ... Pressure sensor, 24, 2
5 ... Exhaust fan, 26, 27, 28 ... Exhaust port,
30 ... Exhaust air volume detection means, 31 ... Exhaust pipe, 3
2 ... Exhaust filter, 33 ... Exhaust fan, 34 ...
Exhaust air volume adjustment damper, 35 ......... Main exhaust stack, 40 ...
Control unit

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-9-50321 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24F 11/04 F24F 7/007 F24F 11 / 02 102

Claims (3)

(57) [Claims] 1. An air-conditioning control method for maintaining a pressure difference between a plurality of rooms and the atmosphere within a set range, wherein a predetermined air supply air volume is provided to maintain the pressure difference within each room within the set range. By performing air supply to each of the chambers by, by performing exhaust from each chamber by a predetermined exhaust air volume, the exhaust air volume is detected in zone units that group the plurality of chambers, and the exhaust air volume is set in the zone units. Adjust the exhaust air flow rate to a predetermined value in, to detect the differential pressure in the specific chamber in the zone, if the differential pressure is outside the setting range, the differential pressure within the setting range In order to do so, the air conditioning control method is characterized in that the exhaust air flow rate is adjusted in units of the zones. 2. The setting range of the differential pressure in each chamber is
The air-conditioning control method according to claim 1, wherein they are different from each other. 3. An air conditioning control system for maintaining a differential pressure between a plurality of rooms and the atmosphere within a set range, wherein a predetermined supply air volume is provided to maintain the differential pressure within each room within the set range. By the air supply means for supplying air to each of the chambers, the exhaust means for exhausting air from each of the chambers by a predetermined exhaust air volume, and the exhaust air volume for detecting the exhaust air volume for each zone in which the plurality of chambers are grouped. A detection unit, a differential pressure detection unit that detects a differential pressure in a specific chamber in the zone, an exhaust air flow rate adjustment damper that adjusts the exhaust air flow rate in the zone unit, and the exhaust air flow rate detected by the exhaust air flow rate detection unit. When the differential pressure detected by the differential pressure detection means is out of the set range, the differential pressure is set within the set range by controlling the opening degree of the exhaust air volume adjustment damper so as to obtain a predetermined value in zone units. Therefore the exhaust An air conditioning control system and having a control unit for controlling the opening degree of the amount adjusting damper, a.