JPH01302113A - Airflow measuring device - Google Patents

Abstract

PURPOSE:To enable accurate and reliable airflow measurement by a method wherein after wind velocity data is collected a plurality of times at each measurement point and averaged and these averaged values over all measurement points are averaged to have average wind velocity calculated. CONSTITUTION:When measuring airflow, a measurer moves to a measurement location displayed on a liquid crystal display device 14 and sets a sensor portion 12a of an airflow meter 12 at a first measurement point #1 of an air outlet 18. After making sure that wind velocity has stabilized, the measurer instructs to start data collection. An output of the airflow meter 12 is acquired into a micro computer 11 via an AD converter 116, averaged and stored in a measur ing buffer 119. Then similar processing is carried out as regards measurement points #2-n, and average wind velocity of all measurement points is calculated. Then, an air quantity is calculated by multiplying an discharge area of the air outlet 18 and an opening ratio, to be displayed on a display 14. Similar processing is carried out as for all air outlets.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an air outlet and an air inlet for air conditioning equipment.

The present invention relates to an air volume measuring device that measures the air volume of a duct, etc.

[Prior Art] When performing air conditioning in each room in an office building or other building, refrigerators, blowers, boilers, pumps, and other auxiliary equipment are installed together in a machine room. The temperature of the air sent to each room by an air conditioner.

The humidity is adjusted and the main duct distributes the air to each room, while the return duct guides the air from each room to the air conditioner in the machine room, thereby maintaining each room at a predetermined pressure. It is designed so that indoor air circulates a predetermined number of times.

In this case, the outlet air volume and the suction air volume at the suction port are important, but these air volumes are affected by the pressure in the duct and the pressure loss at the air outlet or suction port, so the air volume may not be as designed. This is common. For this reason, after arranging ducts, air outlets, and suction ports in each room of a building, the air conditioning equipment is driven, and while measuring the air volume at the air outlets or suction ports, the main damper in the main duct, the air outlet, and The air volume is set by adjusting the damper inside the suction port. Therefore, it is desirable to be able to accurately measure these air volumes at low cost.

However, the conventional method for measuring air volume is to first measure the wind speed at multiple points at the outlet or inlet using an anemometer such as a hot-wire anemometer, then read the wind speed at each of these measurement points from the anemometer, and then calculate the wind speed in advance. Write it down on the prepared list or drawing representing the air conditioning system, and after completing the wind speed measurement work at the outlet or inlet of each system, use a personal computer or notebook computer to enter each measured wind speed value on the keyboard. Calculate the average wind speed at the outlet or inlet by inputting the data from the keyboard, and then multiply the calculated average wind speed by inputting the opening area and opening ratio data from the keyboard, and then calculate the air volume at the outlet or inlet. I was trying to ask for it.

[Problem to be solved by the invention]

In the conventional wind speed measurement method described above, a worker reads each wind speed value measured with an anemometer and writes it in a list, etc., and when calculating the air volume from these measured values, the wind speed data and data such as opening area, opening ratio, etc. This requires a lot of time and effort to measure the airflow, as it has to be entered manually from the keyboard into the computer.In addition, the quality of the airflow data varies because there are individual differences in reading the anemometer readings. There is a problem with lack of reliability.

Additionally, the number of air conditioning outlets and inlets in a typical building is several hundred or more, although this varies depending on the size of the building, so measuring the air volume requires even more time and manpower. Therefore, there were problems in that the measurement work was complicated, lacked accuracy, and increased costs.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide an airflow measuring device for air conditioning equipment that enables accurate and reliable airflow measurement at low cost. .

[Means for overcoming the problem] The airflow measuring device according to the present invention includes a wind speed detection means for detecting the wind speed at the outlet or the suction port, and converts an analog signal according to the wind speed from the wind speed detection means into a digital signal. A-
a D converter, a wind speed converter that captures a digital signal from the A-D converter at predetermined time intervals and converts it into wind speed data; Means for averaging the measured wind speed data for each measurement point and calculating the total average value of the average values for each measurement point as the average wind speed of the outlet or inlet, setting data and measurement processing program regarding the outlet or inlet, storage means for storing measurement data, etc.; means for calculating the air volume of the outlet or suction port based on the average wind speed data from the average wind speed calculation means and the setting data from the storage device; and displaying the measured wind speed and air volume. A storage means for storing the measurement data of the measured wind speed and air volume, and a means for inputting the measurement data into the storage means.

[For production]

In the present invention, the wind speed converting means takes in the digital signal from the A-D converting means at predetermined time intervals and converts it into wind speed data, and the average wind speed calculating means converts the converted wind speed data from the wind speed converting means into the air outlet or suction. After repeatedly taking and adding the average values for each measurement point multiple times and averaging them, the total average value of the average values for each measurement point is taken as the average wind speed of the outlet or suction port, and this total average wind speed and the setting of the outlet or suction port are set. Since the air volume at the outlet or suction port is calculated based on the data, accurate and highly reliable air volume measurement can be achieved at low cost.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an overall configuration diagram of an air volume-1 constant device for an air outlet (or inlet) of an air conditioner to which the present invention is applied.

In the figure, an air volume measurement system 10 includes a microcomputer 11. Anemometer for measuring the wind speed at the outlet or inlet 12. Memory card 13 for storing processing programs, setting values, measurement data, and wind speed conversion tables. Liquid crystal display device 14. Data collection remote switch 15 and data writing remote switch 162
It consists of a push button switch 17 through which the operator inputs work instructions and inputs/changes set values.

The microcomputer 11 for air volume measurement processing is a central processing unit (hereinafter referred to as C) that executes programs and controls the entire system.
(referred to as PU) 111, an internal memory 112 having a RAM configuration that stores data processed by the CPU 11 and data read from the memory card 13, and a memory card 13 connected to the CPU 11 via a bus 113. a memory card control unit 114 that inputs and outputs data;
The data collection remote switch 15. is connected to the CPU III via the lotus 113. A parallel input control section 115 transfers data between the remote switch 16 for data writing and the push button switch 17, and is connected to the CPU 11 via the bus 113 and outputs an analog signal corresponding to the wind speed measured by the anemometer 12. A-D converter 116 that converts into a digital signal, CPU 11 and bus 113
A display that controls the transfer to a liquid crystal display device 14 that displays wind speed, air volume data, and data related to the air outlet (opening area of the air outlet, opening ratio, system number, room number, etc.) connected via the CPU 11 and processed by the CPU 11. interface 117
and a serial input/output control unit 118 that transmits measurement data and receives various control information from and to other computers or printers. Further, 119 is a measurement buffer.

The anemometer 12 is a hot wire type anemometer including a sensor section 12a made of a platinum wire that is heated by passing an electric current through it, and the sensor section 12a is opposed to the air outlet (or suction port) 18. Therefore, there are multiple wind speed measurement points for one outlet 18.

Next, the operation of this embodiment configured as described above will be explained with reference to the flowchart of FIG.

First, a case will be described in which air volume is measured according to a schedule registered in the memory card 13.

In step S1 of FIG. 2, when a power switch (not shown) is turned on, the air volume measurement system 10 is initialized (step 32). The contents of this initial setting operation are as follows:
The PUI 11 accesses the memory card 13 through the memory card control unit 114 to read the wind speed conversion table for A-D conversion from the memory card 13,
The operation of writing to the conversion table area on the internal memory 112 and the operation of reading the measurement time setting file from the memory card 13 and writing it to the measurement time area on the internal memory 112 are performed.

In the next step S3, the schedule file is read from the memory card 13 and displayed on the liquid crystal display device 14. The operation at this time is to read the measurement schedule file with the lowest measurement order from the measurement schedule data stored in the memory card 13 in advance, and write the contents to the measurement buffer 119. The contents of the schedule file are measurement date, measurement location (air outlet system number 1 equipment (air outlet or suction opening) number), opening dimensions, and opening ratio. An example of a data writing pattern to the measurement buffer 119 is shown in FIG. Next, the contents of the measurement buffer 119 are displayed on the liquid crystal display device 14.

An example of the display contents at this time is shown in FIG.

At the time of displaying in this way, the air volume measurement system I
O enters the measurement and collection processing mode, and the processing from step 34 onwards is executed.

That is, during measurement and collection processing, an analog signal that is the wind speed detected by the sensor section 12a of the anemometer 12 is
The conversion unit 116 converts the signal into a 12-bit digital signal, which is input to the CPU 111 at certain time intervals, and is converted into wind speed data using a conversion table on the internal memory 112. This processing operation is repeated n times to find the average wind speed during that time, and the current wind speed is displayed on the liquid crystal display device 14 as shown in FIG. 4 at 0.5 second intervals (step S4
).

In the next step S5, the measurer looks at the display displayed on the display screen of the liquid crystal display device 14, checks the measurement location on the design drawing of the equipment, moves to that location, and sets the sensor section 12a of the anemometer 12. Set at the first measurement point #1 of the air outlet 18. After confirming that the wind speed has stabilized, the data collection remote switch 15 is pressed. At this time, the operation of setting all the average wind speed buffers to O and the operation of measuring and displaying the wind speed are performed. Furthermore, since the mode is the measurement and collection processing mode, the wind speed is displayed in the same manner as in step S4, and the obtained average wind speeds are sequentially saved in the average wind speed buffer.

If a measurement time is indicated in the measurement time setting file read out in advance in step 2, when the specified measurement time has elapsed, it is assumed that data collection is complete, and the air volume is calculated from the wind speed and displayed (step S6). Note that if the measurement time is not indicated in the measurement time setting file, data collection is performed only while the data collection remote switch 15 is pressed, and when the remote switch 15 is released, it is considered that data collection is complete. The operation at this time is to first calculate the average value of all the data in the average wind speed buffer when data collection is completed, and write this average value to an appropriate area of the measurement buffer 119 as "measurement point #n average wind speed °". , this ``measurement point #n average wind speed''.

Calculate the total average value of (from #1 to #n), write it in an appropriate area of the measurement buffer 119 (“all average wind speed゛°”), and then calculate the average value of the air outlet 18 based on this “all average wind speed゛°”. The air volume is calculated and written in the air volume area of the measurement buffer 119. The air volume calculation formula at this time is as follows.

Wind 1 (m'/h) = Total average wind speed (m/s)
3600 (sec) x vertical dimension (m) x horizontal dimension (m)
X aperture ratio (χ) Then, the contents of the measurement buffer 119 are displayed on the display device 14 in the same manner as described above. This display becomes the data of the first measurement point #l of the air outlet 18.

Next, the measurer measures the next measurement points #2 and #2 of the same outlet 18.
The sensor section 12a is moved to . . . and measurements are performed in the same manner as described above (step 37). When the measurements at all measurement points within the air outlet 18 are completed, the remote switch 16 for data writing is pressed (step S8). As a result, all data including the average wind speed for each measurement point is stored on the memory card 13.
At the same time, by erasing the corresponding schedule file in the memory card 13, the air volume measurement of the air outlet 18 is completed.

Next, the measurement schedule for the next outlet is displayed on the display device 14.
is displayed, the process returns to step S3, and the operations from step S3 onwards are repeated to measure the air volume at the outlet according to the schedule.

Therefore, in this embodiment described above, it is possible to set a plurality of measurement points within the same air outlet, measure the wind speed at each of these measurement points multiple times, calculate the average value, and then calculate the average value for each measurement point. The total average value of is taken as the average wind speed of the outlet, and the final data is the data for each outlet, making it easy to manage the data, and since the air volume is automatically measured, there is no need for human intervention when measuring the air volume. Labor effort is greatly reduced, and objective, homogeneous data can be obtained without individual differences or environmental errors caused by human subjective reading of data.

In addition, since the air volume is automatically calculated from the measured wind speed and outlet data, there is no need to calculate the air volume from the measured wind speed, which was required in the past, and the air volume can be measured directly at the measurement location. In addition to automatically processing various airflow data such as room-specific airflow, you can also check various airflow data on the spot.

In addition, although the above embodiment describes the measurement of the air volume at the outlet, the present invention can be similarly applied to the measurement of the air volume at the suction port.

Furthermore, in the above embodiment, a case has been described in which measurements are performed according to a schedule stored in advance in the memory card 13, but the measurement location (system number) is determined at the measurement location.

Set the room number (2 equipment number), opening dimensions, and opening ratio each time using the push button switch 17, and use the individual measurement method to measure, or perform only measurement at the measurement location, and finally enter the set values all at once to obtain the air volume value. A continuous measurement method for conversion may be used.

Displaying the data written in the memory card 13 and registering/changing the setting values are necessary processes at the end of measurement in the case of continuous measurement.

There are two ways to perform this process: one is to execute this process from the state where the measured list is displayed, and the other is to specify the measurement location (system, room 1 equipment number) and execute this process. This is the way to do it.

When this process is activated by either method, the corresponding measured data can be read from the card and set in the measurement buffer area, and the set value can be changed using the push button switch 17. In addition, the file that has been restored after modification is deleted, and the modified data is written to the card with the same file number.

In addition, the process of displaying a list of remaining work for a schedule displays a list of unmeasured locations in the case of schedule measurement.This can be done by reading the schedule file from the memory card, setting it in the measurement buffer area, and displaying it. good.

Furthermore, a schedule can be registered using the push button switch 17, and the registered data is written to the memory card as a schedule file.

〔Effect of the invention〕

As described above, according to the present invention, the wind speed at a plurality of measurement points of the air outlet or suction port is repeatedly measured multiple times, thereby calculating the average wind speed for each measurement point, and also calculating the average wind speed for each measurement point. The total average value is automatically calculated, and this total average value is used as the average wind speed at the opening, and the air volume at the outlet or suction port is automatically determined from this and the setting data of the outlet or suction port (opening dimensions, opening ratio). This makes it possible to measure airflow accurately and with high reliability, and since airflow is measured automatically, human labor when measuring airflow is significantly reduced, resulting in lower costs. At the same time, it is possible to obtain objective and homogeneous data without individual differences or environmental errors caused by human subjective data reading.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of an air volume measuring device according to the present invention. FIG. 2 is a flowchart for explaining the procedure of air volume measurement processing in this embodiment. FIG. 3 is an explanatory diagram showing an example of writing data in the measurement buffer area in this embodiment. FIG. 4 is an explanatory diagram showing a display example of the display device in this embodiment. [Explanation of symbols of main parts] 10...Air volume measurement system 11...Microcomputer 12...Anemometer 12a...Sensor section 13...Memory card (storage device) 14...Liquid crystal display Device 15...Remote switch for data collection 16...Remote switch for data writing 17...Push button switch 111...CPU 112...Internal memory 114...Memory card control section 115...Parallel input Control unit 116...A/D conversion unit 119...Measurement buffer (storage means). Figure 2 No. 3 M87-1

Claims (1)

[Claims] (1) A wind speed detection means for detecting the wind speed at the air outlet or suction port, an A-D conversion means for converting an analog signal according to the wind speed from the wind speed detection means into a digital signal, and
a wind speed converter that captures a digital signal from the D converter at predetermined time intervals and converts it into wind speed data; and an average of the wind speed data measured multiple times for each of the plurality of measurement points of the air outlet or suction port for each measurement point. , a means for calculating the total average value of these average values for each measurement point as the average wind speed of the outlet or inlet, and a storage device for storing setting data, measurement processing programs, measurement data, etc. regarding the outlet or inlet. means for calculating the air volume of the outlet or suction port based on the average wind speed data from the average wind speed calculation means and the setting data from the storage device; means for displaying the measured wind speed and air volume; An air volume measuring device comprising a storage means for storing air volume measurement data and a means for inputting the measurement data into the storage means.