Air Purifier CADR Experimental Chamber Parameters and Particulate Matter Test

The air purifier CADR test chamber is used for particulate matter natural decay testing. Below, we'll explain how to use the HYQW-30G model CADR test chamber to conduct particulate matter decay tests.

Test Equipment: Air Purifier CADR Test Chamber

Equipment Model: HYQW-30G

Equipment Manufacturer: Huanyi Instruments

Test Purpose: Primarily tests the purification efficiency of wall-mounted, floor-standing, and car air purifiers to see if their performance meets standards.

Reference Standard: GB/T 18801-2015

Particulate Matter Natural Decay Test in Air Purifier CADR Test Chamber:

1. Place the air purifier to be tested inside the air purifier CADR test chamber. Adjust the purifier to its rated operating condition, verify normal operation, and then turn it off;

2. Arrange the sampling points, avoiding air inlets and outlets, with a distance greater than 0.5m from the walls and a height of 0.5m~1.5m relative to the test chamber floor. Install one sampling head at each sampling point and connect it to the sampler outside the test chamber;

3. Determine the test record file;

4. Turn on the HEPA filter to purify the air in the test chamber, ensuring that the background concentration of particles larger than 0.3 μm is less than 1000 particles/L. Simultaneously, activate the temperature and humidity control device to achieve the specified indoor temperature and relative humidity;

5. Once the particulate matter background concentration has decreased to a suitable level, record the particulate matter background concentration, turn off the HEPA filter and humidity control device, and turn on the stirring fan and circulation fan.

6. Place a standard cigarette into the cigarette burner. Connect the cigarette smoke outlet to a pipe passing through the test chamber wall. The emitted smoke will be drawn into the air vortex created by the stirring fan. Once a certain amount is reached, close the valve of the smoke delivery pipe. The stirring fan will then stir for another 10 minutes to ensure the particulate matter is evenly mixed before turning off the stirring fan. During the test, the circulating fan should remain on.

7. After the stirring fan stops rotating, use a laser dust particle counter to determine the initial concentration C0 of the particulate matter. At the start of the test, the particle concentration of particles larger than 0.3 μm should be 2*10^5 particles/L~2*10^7 particles/L, corresponding to t=0 min for calculation.

8. After determining the initial concentration in the test chamber (the first sampling point of natural decay), measure and record the particulate matter concentration every 2 minutes. The second sampling point begins at t=0 min, and the measurement continues for 20 minutes.

9. Record the temperature and relative humidity in the test chamber during the test.