JP4185463B2 - Air conditioning control system and air conditioning control method - Google Patents

Description

  The present invention relates to an air conditioning control system and an air conditioning control method, and more particularly to an air conditioning control system and an air conditioning control method that branch air supply from a fan of an air conditioner and supply the air to a controlled area via a damper.

  Conventionally, in a large-scale structure, when air is supplied to each part from an air conditioner through an air supply duct, a VAV damper (variable air supply amount adjustment) is provided for each air supply outlet of each air-conditioning target site (controlled area). A damper is provided, and the opening degree of the VAV damper (damper opening degree) is controlled by the VAV control device in accordance with the load situation of the controlled area.

  In this air conditioning control system, in order to supply an appropriate amount of air to the VAV damper, the rotation speed of the fan of the air conditioner is controlled according to the required air volume from the VAV control device provided for each controlled area. ing. For example, the required air volumes to the first to Nth controlled areas sent from the first to Nth (≧ 2) VAV control devices are summed, and a predetermined sum is obtained from the total value of the required airflows. The rotation speed of the fan of the air conditioner is determined in accordance with a characteristic indicating the relationship between the required air volume and the fan rotation speed (total required air volume−fan rotation speed characteristics).

  In general, the total required air volume-fan rotational speed characteristic is determined based on short-term data at the time of trial operation, and the determined total required air volume-fan rotational speed characteristic is used as it is for a long time. However, the actual total required air volume vs. fan speed characteristics from the beginning due to changes over time due to filter clogging due to long-term use, dirt on ducts, etc. (including changes in outside temperature and humidity, seasonal changes, etc.) If it changes, optimal fan rotation speed control cannot be performed. That is, the actual total required air volume-fan rotation speed characteristics deteriorate, and even if the fan is rotated at the determined rotation speed, the desired total required air volume cannot be obtained on the VAV damper side.

  Therefore, in the fan rotational speed control disclosed in Patent Document 1, a fan rotational speed detector that measures the rotational speed of the fan is provided, and the actual air volume to the first to Nth controlled areas is totaled in a predetermined period, The total value of the actual air volume to the first to Nth controlled areas and the actual measured value of the fan speed at that time are accumulated, and the total value of the actual air volume to the first to Nth controlled areas and the time Create a scatter diagram that plots the correlation with the measured value of the fan speed at a specified sampling interval, create an actual characteristic of the total required airflow-fan speed from this scatter chart, and use this actual characteristic until then. It replaces with the total required air volume-fan rotation speed characteristics. In other words, the actual measured value of the fan speed is fed back, and the total required air volume-fan speed characteristic is periodically corrected.

JP 2002-122346 A

The technique of Patent Document 1 described above is excellent in that optimum fan rotation speed control can be performed regardless of changes over time due to filter clogging, duct dirt, and the like. However, continuing to use filters and ducts that have changed over time causes energy loss, so it is desirable to maintain them at an appropriate time.
Conventionally, maintenance (part replacement and cleaning) of filters and ducts is performed regularly. However, in this case, the maintenance time may be too early or too late, and the optimum maintenance time cannot be known.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide an air conditioning control system and an air conditioning control method capable of performing maintenance at an optimal timing.

In order to achieve such an object, the present invention responds to a load condition of a damper provided in a supply passage of supply air from a fan of an air conditioner and a controlled area that receives supply of supply air through the damper. The damper control means that calculates the required air volume to the controlled area and controls the opening of the damper, and the required air volume that is determined in advance from the required air volume to the controlled area that is sent from the damper control means-fan rotation speed In an air conditioning control system comprising a fan speed determining means for determining the fan speed of an air conditioner according to the characteristics, an initial characteristic storage means for storing an initial characteristic of required air volume-fan speed, and an actual measurement of the fan speed Fan rotational speed measuring means, air volume actual measuring means for measuring the air flow rate of air supplied to the controlled area, fan rotational speed actual measurement value and air flow actual measuring means actually measured by the fan rotational speed actual measuring means More actually measured actual values and the required air volume based on the air volume of supply air to the controlled area - and the actual characteristic generating means for generating actual characteristics of the fan speed, the required air volume - predetermined initial characteristics of the fan speed A maintenance time determination means for determining that the maintenance time is when the actual characteristic of the required air volume-fan speed exceeds a predetermined range defined by the required air volume-fan speed limit line. Is provided.

According to the present invention, the actual characteristics of the required air volume-fan speed are within a predetermined range defined by the initial characteristic of the total required air volume-fan speed and the predetermined limit line of the required air volume-fan speed. When even one location is exceeded, that is, when the actual characteristics deteriorate and the actual characteristics of the required airflow-fan speed exceeds the limit line even at one location, it is determined that the maintenance time is reached. The present invention can also be realized as an air conditioning control method in an air conditioning control system.

According to the present invention, the actual characteristic of the required air volume-fan speed is within a predetermined range defined by the initial characteristic of the total required air volume-fan speed and the predetermined required air volume-fan speed limit line. If even one location is exceeded, it is determined that the maintenance time is reached, and the user can be informed of the determination result so that the maintenance can be performed at the optimal timing.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an embodiment of an air conditioning control system according to the present invention.
In the figure, reference numeral 1 denotes an air conditioner, which includes a cooling coil 1A to which cold water CW is supplied, a heating coil 1B to which hot water HW is supplied, a humidifier 1C that generates steam, and a blower 1D. In the blower 1D, F is a fan and INV is an inverter. Further, a fan rotation speed detector 10 that measures the rotation speed of the fan F is provided for the blower 1D.

  In the air conditioner 1, the cold water CW to the cooling coil 1A, the hot water HW to the heating coil 1B, the amount of steam generated in the humidifier 1C, and the rotation speed of the fan F are controlled by the control device 2, and the air conditioner 1 , The supply air blown out from the fan F is supplied to the controlled areas 4-1 to 4-n via the VAV dampers 3-1 to 3-n.

  In the controlled areas 4-1 to 4-n, air volume detectors 5-1 to 5-n for detecting the amount of supply air (actual air volume) from the VAV dampers 3-1 to 3-n for each area. And temperature detectors 6-1 to 6-n for detecting the room temperature, temperature setting devices 7-1 to 7-n for setting the room temperature, and damper opening degrees of the VAV dampers 3-1 to 3-n. Damper opening detectors 8-1 to 8-n and VAV control devices 9-1 to 9-n are provided.

  Based on the detected room temperature tpv1 from the temperature detector 6-1 and the set room temperature tsp1 from the temperature setter 7-1, the VAV control device 9-1 transfers the controlled area 4-1 to tpv1 = tsp1. The required air volume Vsp1 is calculated, a damper opening set value θsp1 is obtained from the difference between the required air volume Vsp1 and the actual air volume Vpv1 from the air volume detector 5-1, and this set value θsp1 and the damper opening detector 8-1 are obtained. The damper opening degree of the VAV damper 3-1 is controlled so that the measured value .theta.pv1 of the damper opening degree from. Also, the actual air volume Vpv1 from the air volume detector 5-1 and the calculated required air volume Vsp1, and the difference Δt1 between the detected room temperature tpv1 and the set room temperature tsp1 are sent to the control device 2. Similarly to the VAV control device 9-1, the VAV control device 9-n controls the damper opening of the VAV damper 3-n, and the difference Δtn between the actual air volume Vpvn, the required air volume Vspn, the detected room temperature tpvn, and the set room temperature tspn. Is sent to the control device 2.

The control device 2 includes a fan rotation speed determination unit 2-1, a scatter diagram creation unit 2-2 , an approximate curve calculation unit 2-3, a characteristic correction / update unit 2-4, and an initial characteristic storage unit 2-5. And a maintenance time determination unit 2-6. A total required air volume-fan rotation speed characteristic TA is set in the fan rotation speed determination unit 2-1. FIG. 2 shows an example of the initial required characteristic TAs of the total required air volume-fan rotation speed. The initial characteristic TAs is stored in the initial characteristic storage unit 2-5. This initial characteristic TAs is set in the fan rotational speed determination unit 2-1 as the initial total required air volume-fan rotational speed characteristic TA at the start of operation.

  Further, the fan rotational speed determination unit 2-1 is provided with the required air volumes Vsp1 to Vspn from the VAV control devices 9-1 to 9-n, and the scatter diagram creation unit 2-2 has the VAV control device 9-1. To 9-n, and the actual rotational speed (actual value) Npv of the fan F from the fan rotational speed detector 10 are given. The maintenance time determination unit 2-6 includes the differences Δt1 to Δtn between the detected room temperature and the set room temperature from the VAV control devices 9-1 to 9-n, and the total required air volume stored in the initial characteristic storage unit 2-5. An initial characteristic TAs of the fan speed and an actual characteristic TAr created by a characteristic correction / update unit 2-4 described later are given.

  In the present embodiment, fan speed determination unit 2-1, scatter diagram creation unit 2-2, approximate curve calculation unit 2-3, characteristic correction / update unit 2-4, and maintenance time determination unit in control device 2 The function 2-6 is realized as a processing operation of the CPU.

  The scatter diagram creation unit 2-2 adds the actual air volumes Vpv1 to Vpvn from the VAV control devices 9-1 to 9-n at a predetermined period, and stores the total actual air volumes VTpv one after another. Further, in synchronization with the sampling of the total actual air volume VTpv, the actual rotation speed Npv of the fan F is also stored one after another. The sampling of the total actual air volume VTpv and the actual rotation speed Npv is continued for a certain period T (for example, 1 month, 6 months, 1 year, 3 years, etc.). After a certain period T has elapsed, the data are overwritten cyclically in order from the oldest one.

  Further, the scatter diagram creation unit 2-2 plots the correlation between the total actual air volume VTpv and the actual rotation speed Npv when the total actual air volume VTpv is obtained based on the stored total actual air volume VTpv and the actual rotation speed Npv. Create a scatter plot. FIG. 4A shows a scatter diagram after a certain period T has elapsed from the start of operation. In this scatter diagram, the total actual air volume VTpv is on the horizontal axis and the actual rotational speed Npv is on the vertical axis.

  The approximate curve calculation unit 2-3, after the elapse of a certain period T from the start of operation, for example, once a day, from the scatter diagram created by the scatter diagram creation unit 2-2, the approximate curve (of the points plotted in the scatter diagram) The curve connecting the average values) is calculated, and this approximate curve is sent to the characteristic correction / update unit 2-4 together with the coordinate axis. A line Lr indicated by a solid line in FIG. 4B is an approximate curve at this time.

  The characteristic correction / update unit 2-4 sets the vertical axis of the approximate curve Lr sent from the approximate curve calculation unit 2-3 to the fan rotation speed N and sets the horizontal axis to the total required air volume VTsp (see FIG. 4C). ), The actual characteristic TAr of the total required air volume-fan rotation speed is created. Then, the created total required air volume-fan speed actual characteristic TAr is replaced with the total required air volume-fan speed characteristic TA in the fan speed determining unit 2-1.

  In this case, the initial characteristic TAs of the total required air volume-fan speed determined based on the short-term data during the trial operation shown in FIG. 2 is set as TA in the fan speed determining unit 2-1. The initial characteristic TAs of the total required air volume-fan rotation speed is replaced with the actual characteristic TAr. The actual characteristic TAr of the total required air volume-fan rotation speed is obtained from the correlation between the total actual air volume VTpv and the actual rotation speed Npv that have changed due to aging due to clogging of the filter or dirt on the duct. The relationship between the total required air volume and the fan speed is more accurately represented.

  The fan speed determination unit 2-1 adds up the required air volumes Vsp1 to Vspn from the VAV control devices 9-1 to 9-n, and the total required air volume replaced by the total required air volume-actual characteristic TAr of the fan speed. The fan rotational speed N is determined according to (new total required air volume-fan rotational speed characteristic TA), and an instruction value of 0 to 100% corresponding to the fan rotational speed N is given to the inverter INV. As a result, the fan F of the air conditioner 1 rotates at the rotation speed N determined by the fan rotation speed determination unit 2-1, and the air volume to the VAV dampers 3-1 to 3-n is set to the requested total air volume. .

  During such fan rotation speed control, the actual characteristic TAr of the total required air volume-fan rotation speed created by the characteristic correction / update unit 2-4 is given to the maintenance time determination unit 2-6. The maintenance time determination unit 2-6 includes the total required air volume from the characteristic correction / update unit 2-4-the actual characteristic TAr of the fan speed and the total required air volume-fan speed stored in the initial characteristic storage unit 2-5. Based on the difference from the initial characteristic TAs, it is determined whether or not the current time is the maintenance time.

  FIG. 3A is a diagram showing the relationship between the initial characteristic TAs and the actual characteristic TAr when the maintenance time determination unit 2-6 determines that the maintenance time is reached. In this example, a limit line Lm of the total required air volume-fan rotation speed characteristic is defined in the maintenance time determination unit 2-6. This limit line Lm varies depending on the scale of the system and is determined based on experimental results and experience.

  As shown in FIG. 3A, the maintenance time determination unit 2-6 has the actual characteristic TAr exceeding the limit line Lm, and the difference between the initial characteristic TAs and the actual characteristic TAr exceeds the range indicated by the oblique lines in the figure. In this case, it is determined that it is a maintenance time. FIG. 3A shows an example in which all of the actual characteristics TAr exceed the limit line Lm. However, if even one location exceeds the limit line Lm, the maintenance time is determined.

  As shown in FIG. 3B, when there is an actual characteristic TAr between the initial characteristic TAs and the limit line Lm, that is, the difference between the initial characteristic TAs and the actual characteristic TAr is indicated by hatching in the drawing. If it is within the range, it is determined that it is not the maintenance time.

  In addition, when the actual characteristic TAr is between the initial characteristic TAs and the limit line Lm and the actual characteristic TAr, the maintenance time determination unit 2-6 detects the detected room temperature from the VAV control devices 9-1 to 9-n. When the difference between the set room temperatures Δt1 to Δtn is checked and even one exceeds the predetermined value, that is, even one of the controlled areas 4-1 to 4-n cannot maintain comfort. If there is an area, it is determined that it is a maintenance time. This makes it possible to perform simple fault diagnosis.

  Note that the determination of the load status of the controlled areas 4-1 to 4-n does not necessarily depend on the difference Δt1 to Δtn between the detected room temperature and the set room temperature. That is, the temperature control of the controlled areas 4-1 to 4-n is not appropriately performed, and it is only necessary to know the situation where the comfort cannot be maintained. Based on the required air volumes Vsp1 to Vspn, the controlled area 4- The load status of 1 to 4-n may be determined.

  In this way, in the present embodiment, during the fan speed control, the maintenance time determination unit 2-6 determines the maintenance time based on the difference between the initial required characteristic of the total required air volume-fan speed and the actual characteristic. By notifying the user of the determination result, maintenance can be performed at an optimal timing.

  In the embodiment described above, correction / update of the total required air volume-fan rotation speed table TA in the fan rotation speed determination unit 2-1 and maintenance time determination in the maintenance time determination unit 2-6 are performed once a day. However, the correction / update and maintenance determination intervals are free, such as once every two days or once a week. Changes in outside air temperature and humidity, differential pressure due to filter clogging (change in fan suction resistance), etc. do not change suddenly, but change gradually, so the total required air volume-fan rotation speed table TA is corrected.・ Renewal and maintenance judgments do not have to be performed very frequently.

  In the above-described embodiment, a scatter diagram in which the correlation between the total actual air volume VTpv and the actual rotation speed Npv when the total actual air volume VTpv is obtained is created, and the approximate curve Lr calculated from this scatter diagram. The relationship between the fan rotational speed N and the total required air flow rate VTsp indicated by the above formula is the total required air volume-fan rotational speed actual characteristic TAr, but the total required air volume-fan rotational speed actual characteristic TAr is obtained by other methods. May be. For example, instead of creating a scatter diagram, it may be obtained by calculation from collected accumulated data.

  In the above-described embodiment, a system having a plurality of controlled areas 4 provided with the VAV damper 3 has been described as an example. However, a system having one controlled area 4 provided with the VAV damper 3 may also be used. The same can be applied.

It is a figure showing one embodiment of an air-conditioning control system concerning the present invention. It is a figure which shows an example of the initial characteristic of the total request | requirement air volume set to a fan rotation speed determination part at the time of an operation start-fan rotation speed. It is a figure which illustrates the relationship between the initial requirement of a total request | requirement air volume-fan rotation speed, an actual characteristic, and a limit line. It is a figure which shows the actual characteristic of the total required air volume-fan rotation speed shown by the scatter diagram after the fixed period T has passed since the operation start, the approximate curve calculated from this scatter diagram, and this approximate curve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Air conditioner, 1A ... Cooling coil, 1B ... Heating coil, 1C ... Humidifier, 1D ... Blower, INV ... Inverter, F ... Fan, 2 ... Control device, 2-1 ... Fan rotation speed determination part, 2-2 ... scatter diagram creation unit, 2-3 ... approximate curve calculation unit, 2-4 ... characteristic correction / update unit, 2-5 ... initial characteristic storage unit, 2-6 ... maintenance time determination unit, 3-1 to 3-n ... VAV damper, 4-1 to 4-n ... controlled area, 5-1 to 5-n ... air volume detector, 6-1 to 6-n ... temperature detector, 7-1 to 7-n ... temperature setting 9-1 to 9-n ... VAV control device, 10 ... fan rotational speed detector, TA ... total required air flow-fan rotational speed characteristics, TAs ... total required air flow-initial characteristics of fan rotational speed, TAr ... total requirements Air volume-actual characteristics of fan speed, Lr ... approximate curve, Lm ... limit line.

Claims (4)

Calculate the required air volume to the controlled area according to the damper provided in the supply passage of the air supply from the fan of the air conditioner and the load status of the controlled area that receives the supply of air supply through the damper Damper control means for controlling the opening of the damper, and rotation of the fan of the air conditioner according to a required air volume-fan rotation speed characteristic determined in advance from the required air volume sent to the controlled area sent from the damper control means In an air conditioning control system comprising a fan rotation speed determining means for determining the number,
Initial characteristic storage means for storing an initial characteristic of the required air volume-fan rotation speed;
Fan rotational speed measurement means for actually measuring the rotational speed of the fan;
An air volume measuring means for actually measuring the air volume of the supply air to the controlled area;
Based on the measured value of the fan speed measured by the fan speed measuring means and the measured value of the air volume of the supply air to the controlled area measured by the air volume measuring means, the required air volume minus the fan speed. An actual characteristic creation means for creating an actual characteristic of
The actual characteristic of the required air volume-fan speed exceeds a predetermined range defined by the initial characteristic of the required air volume-fan speed and a predetermined limit line of the required air volume-fan speed. An air-conditioning control system comprising: a maintenance time determination means for determining that the maintenance time is a maintenance time. In the air-conditioning control system according to claim 1,
The maintenance time determination means includes
When all the actual characteristics of the required air volume-fan speed are within a predetermined range defined by the initial characteristics of the required air volume-fan speed and the limit line of the required air volume-fan speed, An air conditioning control system that determines whether or not it is a maintenance time based on a load situation of a control area . Calculate the required air volume to the controlled area according to the damper provided in the supply passage of the air supply from the fan of the air conditioner and the load status of the controlled area receiving the supply of air supply through the damper Damper control means for controlling the opening degree of the damper, and rotation of the fan of the air conditioner in accordance with a predetermined required air volume-fan rotational speed characteristic determined from a required air volume sent from the damper control means to the controlled area In an air conditioning control system comprising a fan rotation speed determining means for determining the number,
An initial characteristic storage step of storing an initial characteristic of the required air volume-fan speed;
A fan rotation speed measurement step for measuring the rotation speed of the fan;
An air volume measurement step of measuring the air volume of the supply air to the controlled area;
Based on the actual measured value of the fan rotational speed actually measured in the fan rotational speed actual measuring step and the actual measured value of the air flow rate of the supply air to the controlled area actually measured in the air volume actual measuring step, the required air volume-fan rotational speed. An actual characteristic creation process for creating an actual characteristic of
The actual characteristic of the required air volume-fan speed exceeds a predetermined range defined by the initial characteristic of the required air volume-fan speed and a predetermined limit line of the required air volume-fan speed, even at one location. A maintenance time determination process for determining that the maintenance time is
An air conditioning control method characterized by comprising: In the air-conditioning control method according to claim 3,
When all the actual characteristics of the required air volume-fan speed are within a predetermined range defined by the initial characteristics of the required air volume-fan speed and the limit line of the required air volume-fan speed, An air-conditioning control method characterized in that it is determined whether or not it is a maintenance time based on a load situation of a control area .

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