Airflow Measurement Test System

The airflow measurement test system complies with GB/T 1236, GB/T 17713, ISO 5801, IEC 61591, IEC 60665, GB/T 14806, JIS B 8330, JIS C 9603, and other relevant standards. It can be used for performance testing of ventilation fans, air conditioners, cooling fans, range hoods, etc., without any hardware or software changes.

Key Features

1. Multi-nozzle      wind-chamber structure: The appropriate nozzle can be selected according      to the measured flow rate, enabling a wide measurement range with one      system.

2. Dual-mode testing:      Suitable for both blowing (discharge) and suction (inlet) tests.

3. Equipped with an      auxiliary fan: Enables measurement of full-range performance curves,      including conditions of zero airflow and zero static pressure.

4. Fully automated testing      & reporting: Automatic test control, calculation, data output,      graphical display, and printing via PC. Simple HMI operation, high      accuracy, time- and labor-saving.

5. Test items:

• P–Q characteristic       (airflow vs. static pressure)

• Q–η characteristic       (airflow vs. efficiency)

• Simultaneous       measurement of the DUT’s speed (rpm), current, power, etc.

Test Principle

Developed based on IEC standards and advanced Japanese technology.
Principle: The DUT’s actual operating condition is simulated in the test wind tunnel (the auxiliary fan is used to match the outlet pressure to the required condition). The pressure differential across the nozzle is measured, the corresponding air velocity is calculated using standard formulas, and the airflow is obtained by multiplying by the nozzle area and the relevant flow coefficient.

Applicable Products

Performance testing for ventilation fans, air conditioners, cooling fans, range hoods, etc. (no hardware/software modification required).

Overall Proposal

This proposal does not include the laboratory building/civil construction; the user shall build it according to the standard requirements.

1. General Laboratory Requirements

For the range hood air performance test device, the orifice-plate method is used to test the rated airflow, rated pressure, and efficiency. During testing, the operator manually replaces the orifice plate; the computer automatically collects pressure, temperature, and power data, processes the results, and prints the test report.

• Room size: ≥ 4500 (W) ×      6000 (L) × 2800 (H) mm

• Walls: Smooth and flat;      no openings affecting airflow (air-conditioner outlets shall not blow      directly into the test section).

• Floor: Keep level.

2. Test System

2.1 Main Components

• Airflow test wind tunnel

• Auxiliary fan and damper      adjustment mechanism

• Measurement &      control electrical cabinet (including VFD power supply, electrical      parameter meter, pressure transmitter, tachometer, etc.)

• Branded PC

• Printer

• DUT lifting platform

• DUT mounting flange and      test ducting

2.2 System Functions

After the computer prompts the user to input DUT parameters and test data, the system performs fully automatic measurement and control, including:

• Airflow measurement

• Voltage / current /      power measurement

• Speed (rpm) measurement

• Temperature / humidity /      atmospheric pressure measurement

• Test process prompts

• Data tables and related      curves

2.3 Power Supply Requirement

The user shall provide an independent distribution switch.
Three-phase, four-wire + PE (ground): AC 380 V, 50 Hz; max. capacity: 5 kVA

3. Test Software

1. Windows-based (Windows      10), window interface, Chinese display.

2. Collects all measured      data and provides real-time continuous monitoring in numeric and tabular      formats.

3. After the test,      automatically performs statistical analysis/processing of raw data,      displays and prints test results.

4. Historical data query by      test date, ID, model, etc., with display and printing.

5. Interface and related      data can be customized/modified according to user requirements.

Technical Specifications

1. Lab power: AC 220 V / AC      380 V, 50 Hz; 5 kVA

2. Environment: 20 ℃      ± 5 ℃; 30%–80% RH; atmospheric pressure:      normal

3. Airflow measurement      range (depending on nozzle configuration):

• 0.06–25 m³/min

• 0.2–50 m³/min

4. Static differential      pressure: 0–1250 Pa, accuracy ±0.1%

5. Electrical parameters:      voltage/current/power accuracy Class 0.5, digital display

• Voltage range: AC 0–300       V

6. Speed: digital display 0–19999      rpm, ±5 rpm

7. Air temperature: 0–100 ℃,      ±0.5 ℃

8. Air humidity: 20–98% RH,      ±4%

9. Variable-frequency      regulated power supply:

• Input: AC 220 V, 50 Hz

• Output: AC       0–110–220–300 V, continuously adjustable, ≤1%

10. Operating point testing:      automatic adjustment (replacing the original 18 throttling/orifice plates)

Automatically Calculated Items (Operating Condition)

1. Indicated static      pressure in the pressure-reducing chamber: Ps6 (Pa)

2. Input electrical power: P      (W)

3. Airflow at test      condition: Qv (m³/s)

4. Total pressure at test      condition: Pfb (Pa)

5. Total pressure at      standard air condition: Pfbn (Pa)

6. Static pressure at test      condition: Ps2n (Pa)

7. Total pressure      efficiency at test condition: η (%)

Automatically Generated Results After Testing

1. Maximum static pressure      (static pressure at zero airflow): Ps2n(max) (Pa)

2. Maximum airflow (airflow      at zero static pressure): Qv(max) (m³/min)

3. Static pressure at      specified airflow (7 m³/min): Ps2ns (Pa)

4. Main motor input power      at specified airflow (7 m³/min): P (W)

5. Total pressure      efficiency at specified airflow (7 m³/min): η (%)

Curve Plotting & Test Modes

The system can plot curves of:

• Static pressure vs.      airflow

• Airflow vs.      speed/current/power/efficiency, etc.
       It also supports testing the DUT in both inlet (suction) and outlet      (discharge) modes.

（Keywords: range hood airflow chamber / range hood airflow test room / ventilation fan airflow chamber / airflow measurement system）