I. Scope of Application (Electric Fan Energy Efficiency Test Lab / Pedestal Fan Airflow Measurement Test Lab)

The system is computer-controlled and can display the wind speed value at each test point. Typically one test point every 3 minutes (including probe traversing, a delay of about 1 minute, and a measuring time of about 2 minutes). It can display the average wind speed of each circular ring and the point airflow, automatically generate the inspection results and process curves, and print them out.
PC configuration: ≥ 250 GB hard drive, 17-inch LCD monitor, ≥ 2 GB RAM.

Test range: table fans, wall-mounted fans, table/pedestal fans, ceiling fans, oscillating-blade fans, pedestal fans, and hanging/ceiling fans.

The device shall comply with the IEC 60879 requirements for airflow testing, featuring a reasonable design, high automation, easy operation, durability, and sufficient load-bearing and vibration resistance.

During testing, measurement shall start at two points approximately 20 mm from the fan blade axis. Then, move point-by-point along a horizontal line to both sides in 40 mm increments until the measured average wind speed decreases to below 24 m/min.

The system shall be equipped with a multifunction electrical power meter capable of measuring voltage, current (true RMS), and power, and a 500 VA variable-frequency voltage-regulating power supply (±1%). The specific configuration shall follow the configuration list.

Testo 435-2 vane anemometer (Germany), vane diameter 100 mm; 4 units in total.

The fan mounting stand and the anemometer holder shall be equipped with a universal adjustable pan-tilt head, and the installation height can be conveniently adjusted within the required range.

II. Test Screen Size and Construction (Outer Wall & Inner Screen Dimensions)

Floor construction method shall be specified (see the drawings attached to the contract).

The test screen shall be built using 50 mm thick expanded polystyrene (EPS) lightweight thermal insulation panels. The floor must be level, and the sensor traverse mechanism shall be built directly on the floor. The test mechanism should be as compact as possible to minimize its influence on the airflow field.

The main test device adopts a separated structure, so the unstable vibration of the tested fan during high-speed operation will not affect the wind speed sensor.

III. Combined Installation of Laboratory Outer Wall and Inner Screen

1) Laboratory outer wall dimensions (three options)

For ceiling fans: 6.5 m × 6.5 m × 3 m

For pedestal fans: 6 m × 4.5 m × 3 m

For wall-mounted fans: 4.5 m × 4.5 m × 3 m

Outer wall installation method:
A fixed type is used for 6.5 m × 6.5 m × 3 m. A modular/assembled type is used for 6 m × 4.5 m × 3 m and the ceiling panel, with an access door.

Door size shall be specified in detail. An observation window shall be added and its size shall also be specified. The material for the outer wall shall be specified as high fire-rating fireproof boards with electrostatic powder coating.

Outer wall thickness and fire rating shall be specified; thickness is approximately 20 mm.

2) Laboratory inner screen dimensions

Inner screen size: 4.5 m × 4.5 m × 3 m

Inner screen installation method: modular assembly (multiple main panels and auxiliary panels connected with fasteners). Assembly method shall follow the contract attachments and drawings. (The original design was sliding.)

Material for the inner screen shall be specified: constructed with 50 mm EPS lightweight thermal insulation panels, combined with high fire-rating fireproof boards, with electrostatic powder coating.

One wall of the inner screen shall have a door for personnel to place/remove samples and check the test environment.

IV. Door Size and Additional Requirements

Door size shall be specified in detail.

The bottom of the inner screen wall shall include a 0.45 m-high section that can be flipped, to serve as the inner screen arrangement for ceiling fan testing.

Ceiling fan mounting and lifting

A simple lifting frame of 2500 mm with a motor and guide is installed on the ceiling panel. The motor drives the mounting plate (with the ceiling fan under test) to move up and down to adjust height. The mounting plate can reach 1.5 m above the floor, making it convenient to replace the ceiling panel and install samples.

Airtightness

When testing different fan types, the corresponding test room shall maintain good airtightness and shall not affect test quality.

V. Main Technical Parameters and Functions

1. Main Technical Parameters

Meets airflow testing requirements for table fans, wall-mounted fans, pedestal fans, and tower fans, etc.

Laboratory dimensions (for small fans): 4500 × 4500 × 3000 mm

2. Main Functions

Used to measure:

Air velocity, temperature, humidity

Electrical parameters: voltage / current / power / power factor

Rotational speed (rpm) and time

3. Technical Requirements

3.1 Applicable Range (Unit: mm) — Fan Blade Diameter

Table fan: 200, 230, 250, 300, 350, 400, 450, 500

Wall-mounted fan: 250, 300, 350, 400, 450, 500

Table/pedestal fan: 300, 350, 400, 450, 500

Pedestal fan: 300, 350, 400, 450, 500, 600

Oscillating-blade fan: 200, 230, 250, 300, 350, 400, 450, 500

3.2 Measurement Accuracy

Temperature: 0–50 ℃, accuracy ≤ ±0.5 ℃

Air velocity: 0–20 m/s, accuracy ≤ ±(0.01 m/s + 2% of reading)

Current: 0–5 A, accuracy ≤ ±0.5%

Voltage: 0–300 V, accuracy ≤ ±0.5%

Power: 0–1000 W, accuracy ≤ ±0.5%