Test for Cleaning Capacity of Air Duct Cleaning Device
A. Scope of Air Duct Cleaning Device
1.This article stipulates the testing device, the test method and the test result handling method for evaluating the cleaning effect of the air duct cleaning device.
2.This article is applicable to the modular air cleaner installed in the ventilating duct of the air conditioner.
3.The target pollutants are particulates, gaseous pollutants and microbes.
4.Refer to GB/T 2624.1 and GB/T 1236 for the testing device.
5.The testing device mainly includes 3 parts - air duct system, the pollution source generation device, and the determination device; the structure of the testing device is allowed to be different, but the test conditions shall be consistent with that of this Standard.
B.Test equipment of Air Duct Cleaning Device
1.General requirements of device
The Air Duct Cleaning Device mainly includes the air duct system, the pollution source generation device and the instrument. The pipe section can be bent or folded, but the straight pipe section at least 3 times the pipe diameters shall be reserved in front of and at the back of the corner to ensure the airflow stability. The structure of the testing device is allowed to be different, but the test conditions shall be consistent with that of this Standard. The test result of the same cleaner-under-test shall be consistent with that of the testing device in this Standard.
2.1 Structure
The production and installation requirements of the Air Duct Cleaning Device shall comply with GB 50243. The misalignment of any edge shall not be more than 1.5 mm when the pipe sections are connected. The whole air duct system shall be tight, and shall be pressurized for leakage detection before being put into use. Its pressure shall not be lower than 1.5 times the rated fan air pressure of the air duct system. The connection and testing of pipe sections shall conform the following requirements:
a) The length of pipe section for clamping the cleaner-under-test shall be 1.1 times the length of the cleaner-under-test and shall not be less than 1000 mm. When the sectional dimension of the cleaner-under-test is different from the section of the tested air duct, the reducer pipe shall be used;
b) When the counting efficiency is determined, the mounting holes of the sampling pipe shall be arranged below the pipe in the test device;
c) The structures of the static pressure ring and the flow straightening grid for determining the resistance of the cleaner shall conform to the requirements of GB/T 1236. The air flow shall be ensured to pass through the cleaner-under-test not to cause the air flow short circuit, for example, use the reducer pipe or the closing plate.
2.2 Introduction of air for testing
The introduction of air for testing shall meet the following requirements:
a) The air for testing shall be clean, and the background concentration of the pollutants in air duct shall not exceed 5% of the standard concentration;
b) The air duct shall be provided with the protecting net and the static pressure chamber at the suction inlet. The dimensions of the static pressure chamber shall not be less than 2mX2mX2m, but its volume shall not be larger than 10 m3;
c) The two-stage air filter shall be installed at the inlet of the static pressure chamber to ensure that the air entering the air duct is clean;
d) When the outdoor air temperature is lower than 5 °C or the relative humidity is higher than 75%, the heating mode can be used to increase the temperature or reduce the relative humidity to ensure that the temperature range is 5 °C ~ 35 °C and the relative humidity is 0~75%.
2.3 Exhaust
The exhausted air in the Air Duct Cleaning Device is exhausted to the outdoor after being treated, or exhausted into the rooms except the suction inlet of the air duct system.
2.4 Shock insulation
The Air Duct Cleaning Device shall be insulated from the fan or other shock sources in the test room.
