Air purifier

Air purifier - An air purifier is a device which removes contaminants from the air. These devices are commonly marketed as beneficial for people suffering from allergies and asthma, and reduce or eliminate tobacco smoke. Air purifiers commercial quality are manufactured either as small autonomous units or larger units that can be attached to the air handling unit (CTA) or HVAC units found in the medical industry, industrial and commercial.

Use and benefits of purifiers

Dust, pollen, pet dander, mold spores and dust mite feces can act as allergens, causing allergies in sensitive individuals. Smoke particles and volatile organic compounds (VOCs) can pose a risk to health. Exposure to various components such as VOCs increases the likelihood of experiencing symptoms of sick building syndrome.  In addition, with the advancement of technology [unintelligible], air purifiers are becoming increasingly capable of capturing more bacteria, viruses and DNA damaging particles [citation needed] The purifiers air are used to reduce the concentration of contaminants in the air and can be beneficial for people who suffer from allergies and asthma ..

Purify technical

    Germs ultraviolet irradiation - UVGI can be used to sterilize the air that passes through the UV lamps forced air. Air purification systems can be independent units UVGI with UV lamps shielded using a fan to force air past the UV light. Other systems are installed in forced air systems so that traffic moving when micro-organisms through the lights. The key to this form of sterilization is placement of the UV lamps and a good filtration system to remove micro-organisms die. For example, forced air systems by design impede line of sight, thus creating the environment that will be shaded against UV rays. However, the UV lamp is placed in the coil and the cooling system will drainpan microorganisms to form in damp course. The most effective method for treatment of the air coil is online, the conduit system, the system is placed in the middle of the track and parallel to the air flow.

    Filter - traps based purification of airborne particles by size exclusion. Air is forced through the filter and the particles are captured by the filter physically.

    HEPA filters remove at least 99.97% of particles 0.3 microns and generally more effective for larger particles. HEPA purifiers which filter all incoming air in a clean room should be arranged so that the air passes through a HEPA filter. In dusty environments, a HEPA filter may follow easy to clean classic (pre-filter) which removes coarse dirt so that the HEPA filter should be cleaned or replaced less frequently. HEPA filters do not generate ozone or harmful byproducts.

    HVAC filter MERV 14 rating or above to eliminate airborne particles 0.3 microns or larger. High MERV 14 filter has a capture rate of at least 75% of the particles between 0.3 to 1.0 micrometers. Despite the arrest rate is lower than MERV filters with HEPA filters, central air conditioning system can move much more air in the same period. Using high quality MERV filter can be more effective than the use of a high-powered HEPA machine at a fraction of the initial investment. Unfortunately, most of the furnace filters slid into place without a seal, which allows air to pass through the filter. The problem is worse for high efficiency MERV filters because of the increased air resistance. High efficiency MERV filters are usually denser and increase air resistance in the central system, which requires a reduction in air pressure above and rising energy costs accordingly.

    The activated carbon is a porous material that can absorb volatile chemicals that are molecularly, but do not eliminate the larger particles. Adsorption process for the use of activated carbon must reach equilibrium so that it can be difficult to completely eliminate contaminants.  The activated carbon is the process of changing contaminants from the gas phase to the solid phase, where contaminants may be disturbed or aggravated regenerated in indoor air sources . Activated charcoal may be used at room temperature and has a long history of commercial use. It is generally used in conjunction with other filter technology, especially with HEPA. Other materials can also absorb chemicals, but with higher costs.

    Polarized-Media Electronic Air Filters actively using electronic media improved to incorporate elements of crossover both mechanical and electronic air cleaners. Most Polarized-Media Electronic Air Filters convert the DC 24-volt safety voltage to create an electric field polarized. Suspended particles are polarized as they pass through an electric field and adhere to the fiber media pad wear. Ultra-fine particles (UFPS) were not collected on their initial pass through the buffer polarized media and other particles clumping, odor and VOC molecules and collected the next trajectory. Media-polarized efficiency electronic air filters increases as the load, ensure high efficiency filtration with air resistance is generally at or below the crossover. Polarized media technology is non-ionizing which means no Ozone is produced.

    Photocatalytic oxidation (PCO) is a new technology in the HVAC industry.  In addition to the prospect of Indoor Air Quality (IAQ) benefits, has added the ability to limit the entry of unconditioned air into the building, thus offering the possibility of energy savings compared to previous prescriptive models. In May 2009,   no concerns raised by more questionable data Lawrence Berkeley National Laboratory that PCO may significantly increase the amount of formaldehyde in real indoor environments.  Like other technologies, the principles of good governance that will be used by the designer for HVAC ensure the proper application of technology. Photocatalytic oxidation system can completely oxidize and degrade organic contaminants. For example, volatile organic compounds, low concentrations of a few hundred ppmv or less are more likely to actually oxidized.  (PCO) used for short-wave ultraviolet light (UV-C), commonly used for sterilization, to feed the catalyst (usually titanium dioxide (TiO2) [9]) and oxidizing bacteria and viruses . BCP led units can be mounted to a forced air system HVAC. BCP is not filtering technology, because it does not trap or remove particles. It is sometimes associated with other filtering technologies for air purification. UV sterilization lamp should be replaced once a year, manufacturers may require periodic replacement as the warranty conditions. Photocatalytic oxidation systems often have high commercial costs.

    Ionizer purifiers use electrical or charged surfaces of the needles of generating air or electrically charged gas ions. Ions attach to airborne particles are then electrostatically attracted to a charged collector plates. This mechanism produces trace amounts of ozone and other oxidants as by-products  Most ionizers produce less than 0.05 ppm ozone, industrial safety standards .. There are two major subdivisions: the fanless ionizer fan-based ionizer. Ionizers are noiseless and use little energy fan, but the air purification less effective. Fan-based ionizers clean and distribute air more quickly. Permanently installed in the house and industrial purifier called electrostatic dust.

    Ozone generators produce ozone, and is sometimes sold as any air purifier home. Unlike ionizers, ozone generators are designed to produce large amounts of ozone, a strong oxidant gas which can oxidize other chemicals. Use only shielded from ozone generator in unoccupied rooms, using a shock treatment "" commercial ozone generators that produce over 3000 mg of ozone per hour. Restoration contractors use this type ozone generators to remove smoke odors after fire damage, musty smells after flooding, mold (including toxic molds), and odors caused by decaying flesh which can not be removed by bleach or anything else except for ozone. However, it is not healthy to breathe ozone gas, and should be cautious when buying an air purifier that also produces ozone.

    Titanium dioxide (TiO2) technology - TiO2 nanoparticles and the calcium carbonate to neutralize the acid gas that can be absorbed in the mixed paint a little porous. Photocatalysis initiate decomposition of the contaminants of the air at the surface