What are the specific requirements for the performance of air purification equipment?
Publish Time: 2024-08-21
The performance requirements of air purification equipment usually include the following aspects:
Purification efficiency:
Filtration efficiency: refers to the ratio of the mass (or number) of particles captured by the filter to the mass (or number) of particles in the air upstream of the filter, which is divided into full efficiency and graded efficiency. Full efficiency is the ratio of the total amount of particles captured by the filter to the total amount of particles in the air upstream of the filter; graded efficiency is the capture efficiency of the filter for particles in a certain particle size range. The same filter has different capture efficiencies for particles of different particle sizes. The larger the particle size, the higher the graded efficiency.
Purification energy efficiency: calculated by dividing the CADR value by the input power, divided into high-efficiency grade and qualified grade. The national standard requires that the purifier must reach the qualified grade. This indicator can evaluate the performance of the purifier more comprehensively, making purifiers of different grades comparable. It is recommended to choose a purifier with high CADR and purification energy efficiency, which can not only meet the purification speed requirements, but also save energy and protect the environment.
Rated air volume: The air volume that the filter product treats per unit time specified when it leaves the factory, in m³/h. In engineering applications, it can be obtained by multiplying the filter's face velocity by the filter's face area. The actual treated air volume should not be greater than the rated air volume.
Resistance: The total pressure loss of air flowing through the air filter. The resistance of air passing through an undusted filter at rated air volume is called the initial resistance, and the specified value reached by the resistance increase due to dust accumulation on the filter at rated air volume is called the final resistance. For coarse, medium, high and sub-high efficiency filters, the final resistance is generally specified to be no more than twice the initial resistance, or the data is provided by the manufacturer.
Applicable area: Select the applicable area based on the purification capacity of the air purifier (CADR value, usually for particulate matter). Since environmental factors such as the initial concentration of pollutants vary greatly, the building standards and ventilation conditions of various rooms are different, so the "applicable area" is only a reference indicator.
Cumulative purification capacity (CCM): As the purifier is used for a longer time, the pollutants accumulated on the filter increase, and the purification effect will gradually decrease. When it drops to 50% of the initial CADR, it should be replaced. The mass of pollutants that the filter has purified cumulatively during this period is CCM, in mg. The larger the CCM, the longer the filter replacement cycle and the lower the replacement frequency.
Purification life: CCM is the cumulative mass of pollutants purified before the purifier filter is replaced. If the mass of pollutants that the purifier needs to purify every day (i.e. the average daily processing volume) is determined, the number of days or months the filter is used can be calculated.
Noise: Air purification equipment will generate noise when it is running. The noise level of non-industrial air purification equipment is an important performance indicator. Usually, air purification equipment with a noise level of less than 55 decibels (dB) during normal operation is required in the living room, and less than 35dB in the bedroom.
Harmful substance release: Mainly for purifiers based on the electrostatic principle, because they are prone to produce harmful substances such as ozone. When purchasing, consumers should check the relevant product test reports to ensure that the harmful substances released by the product meet the standards.
Microbial removal (antibacterial, mildew-proof, sterilization): including three microbial-related performance indicators: antibacterial rate (antibacterial performance), mildew-proof level (anti-mold performance), and sterilization rate. Antibacterial rate and mildew-proof level refer to material properties. Filters with antibacterial and mildew-proof functions can kill bacteria and mold trapped on them to prevent them from continuing to reproduce. The standard requires that the antibacterial rate be no less than 90%, and the mildew-proof level must reach level 0 or 1; the sterilization rate is the performance of the whole machine. Purifiers with sterilization functions can kill microorganisms in the room air. The standard requires no less than 50%. This function is helpful for the elderly and children with poor resistance, especially when used in the flu season or in a humid environment, special attention should be paid
