Ultra-low resistance and high-efficiency air filter is actually a type of air filter. The difference is that when the efficiency of ordinary air filter is high, the resistance is larger, and its application in air conditioning systems is often restricted by fans. Due to the limitation of insufficient pressure head, especially in the form of air conditioning systems with fan coil units and fresh air, the development of low-resistance and high-efficiency air filters has become an urgent problem to be solved. After years of research, researcher Xu Zhonglin of the China Academy of Building Sciences has developed a number of patented products such as ultra-low resistance and high-efficiency air filters, ultra-low resistance, energy-saving and high-efficiency purification new (return) air units, which have been widely used in hospitals, clean factories, laboratories and other fields.
Some wards and operating rooms such as the tumor building, surgical building, geriatric cardiovascular disease institute, etc. of a hospital have quoted the patented product of ultra-low resistance and high efficiency air filter as a national science and technology in the "Eleventh Five-Year Plan" The demonstration project construction project supported by the topic "Research on Key Technologies for Control and Improvement of Indoor Biological Pollution in Buildings" has been operated for more than a year and the results show that it has excellent performance and can effectively reduce indoor pollution without affecting the air volume of the air conditioning system. This project has been inspected and appraised by the air-conditioning environment inspection department for the above-mentioned demonstration project, and compared with the indoor air-conditioning environment that does not use ultra-low resistance and high-efficiency air filters, and relevant inspection data are given, with a view to providing better solutions for the hospital building air-conditioning system. The design and construction provide some useful references.
Air filtration is a purification method that allows the air to pass through fiber filter materials to capture particulate pollutants in the air. Air filtration can not only filter particulate pollutants but also bacteria and viruses. This is because microorganisms such as bacteria and viruses cannot exist alone in the air and are often found on the surface of dust particles that are several times larger than them. The bacterial filtration effect of high-efficiency filters has been established, and the ratio of filtration to filtration is ≥ o. 5 μm particles are 1-3 orders of magnitude larger. This is because the equivalent diameter of microbial particles is about 1-5 μm. Professor Tu Guangbei concluded that the filtration efficiency of fibers for atmospheric bacteria has a good linear correlation with the counting efficiency for atmospheric dust of ≥5 cubic meters. The filtration efficiency for atmospheric bacteria can be approximately regarded as the filtration efficiency for atmospheric dust of I>5 cubic meters. Counting efficiency.
The parameters of the ultra-low resistance and high-efficiency air filter are explained. From the "Ultra-low resistance and high-efficiency air filter filtration efficiency table" and the above analysis, it can be seen that the ultra-low resistance and high-efficiency air filter has the best effect on atmospheric bacteria. The filtration efficiency is >t95%, which can effectively reduce indoor microbial pollution. The resistance and air volume relationship curve of the Cai-type ultra-low resistance and high-efficiency air filter (500ram×400ram×60mm), such as "Ultra-low resistance and high-efficiency air filter resistance air volume" "Relationship Curve" is shown. From the "Relationship Curve of Ultra-Low Resistance and High Efficiency Air Filter Resistance and Air Volume", it can be seen that the resistance of this filter basically linearly changes with the air volume. Curve system, the air volume is 700m3/hN, the resistance is less than 20Pa, and it can be widely used in fan coil systems with residual pressure of 50Pa or even 30Pa.