In accordance with the requirements of IEC 60879-2018, "AC Electric Fans and Speed Controllers," the wind speed value of the electric fan is measured and the air flow is calculated in accordance with the requirements of the IEC standard. The ordinary air flow test device is operated by manpower, and the operator enters the test room, which disrupts the wind field, resulting in inaccurate test data and reduced efficiency.
This fan test chamber is operated by computer control and a stepping motor drive. The operator is outside the test room, so there is no impact on the wind field. The equipment is tested automatically, and the test data is recorded, saved, and generated automatically. This includes an air volume report and energy efficiency rating. The data is accurate, repeatable, efficient, and convenient to store.
The chamber primarily comprises an air volume test mechanism, test screen, specimen mounting frame, test screen, computer control system, and so forth. The test room headroom must be at least 4000mm, with no beams or columns and no other dry airflow components. The test screen and test screen form an air circulation channel to accommodate varying specimen specifications. The test screen top hole is adjustable to suit different specimens. The test is mounted on a specimen mounting frame that can be adjusted in height. The test is mounted on a specimen mounting bracket that can be adjusted in height. The mounting bracket is equipped with a motor that automatically adjusts the height of the specimen. The four anemometer holders can be moved in four directions along the two diagonals of the test inner screen. They are moved by stepping motors, with the initial position in the middle of the zero position. The stepping motors are controlled by the computer during the automatic test to collect a wind speed value at the point where the half-diagonal distance from the center point is 40mm. This completes the test of the wind speed of one wind ring. The test then proceeds to the measurement of wind speed value of the other wind ring. Please enter another wind ring to measure the wind speed value. Each wind ring radius value should be added for 80mm until the measured wind speed value is less than 9m/min. The average speed of any wind ring is calculated by averaging the readings taken on the diagonal of the four halves of the ring at the average radius of the ring.
The computer is used primarily for setting test parameters, including the distance of the anemometer from the center, the position of the anemometer relative to surrounding collection points, and so on. It also receives test data from the PLC, calculates and analyzes test data, calculates air volume values, calculates energy efficiency values, stores and queries test data, and so on. Meanwhile, it sends the execution command to the PLC according to the operator's instructions. The PLC controller carries out the execution command of the computer and collects data values from the anemometer and wattmeter. The PLC controller primarily executes instructions from the computer and collects data values from the anemometer and power meter.
1,Test external screen
1) Inner size: L6500mmXW6500mmXH4200mm.
2)Dimension of opening door: W1500mmXH2000, the door opens inward.
2.Test inner screen:
1) Inner size: L4500mmXW4500mmXH3000mm±15mm.
2) The height of the bottom of the test screen from the ground: 450mm.
3) Top hole diameter range: φ1000mm-φ2000mm, 10%-20% larger than the diameter of the fan blade, open the top hole in the center of the top screen.The thickness of the partition of the screen is not more than 6mm, and the ceiling of the outer screen is not less than 1000mm from the ground.
4) Top hole adjustment mode: electric without group adjustment.
3.Sample mounting frame:
1) Height adjustment range: 0-600mm (based on the plane of the top hole of the test screen).
2) Adjustment mode: electric adjustment.
3) Specification of test mounting plate: L1200mmX1200mm.
4.Air volume measurement mechanism:
1) Vertical distance between anemometer seat and sample: 1500mm±100mm.
2) Moving distance of anemometer slide: 20-2800mm (electric adjustment).
3) Driving mode: stepping motor + guide shaft.
4) Positioning accuracy: ±1mm.
5.Anemometer:
1)Quantity: 4 sets.
2)Impeller diameter: ≤100mm
3)Measuring range: 0~1200mm/min(20/s)
4) Measurement accuracy: 0.1m/s ± 1.5% of the measured value
5)Wind speed sensitivity: better than 0.15m/s
6.Temperature probe: range 0 + 50 ºC: accuracy ± 0.5 ºC
7.Control mode: computer control.
8.Acquisition data: power value, wind speed value.
9.Data processing: automatic calculation of the average wind speed, air volume, energy efficiency, energy efficiency rating.
10.Data storage, check function.
11.Control software: running on windows7 operating system, you can set the location of the data collection point, wind speed data collection,
Power data acquisition, average wind speed calculation, wind volume calculation, energy efficiency value calculation, energy efficiency rating and other functions, can be automatically generated, print test reports, data storage, check function.
Automatic generation and printing of test reports, storage of current test data, query historical data.
12.Equipped with Japan Yokogawa WT210 digital power meter: can measure voltage, current, power: precision 0.1%.
13.Inverter power supply: 0 ~ 300V 1KVA
14.Indoor environment:
Temperature: 25ºC±5ºC. Humidity: 45%~85%. Voltage fluctuation: ±1%. Power supply frequency fluctuation value: ±1%.
1. Sample Installation: In accordance with the provisions of EC60879-2018, "AC electric fan and governor," the laboratory is required to maintain the stability of the sample during the installation of the tested electric fan.
2. The air volume was measured using an automatic air volume measurement device, and the wind speed was tested for two minutes. Determination of the input power of the electric fan: According to EC60879-2018, "AC Fans and Speed Regulators," to determine the input power of the motor, the oscillating head function of the fan should not be included in the calculation.
4. The energy efficiency value is determined by dividing the average value of the measured output air volume by the measured input power of the motor. This value is calculated for the electric fan in the rated voltage, rated frequency, and at the highest speed of operation.
5. The energy efficiency limit values and energy-efficiency ratings in the table of limit values and sample measurements were calculated to determine the sample energy-efficiency rating based on the "AC fan energy efficiency limit values and energy-efficiency rating" in the table.
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