Air Conditioning Unit 16x25x1 Hepa Filter
Air Conditioning Unit 16x25x1 Hepa Filter The installation position of the fan section and the filter section of the clean room air conditioning box is mostly like this: primary filter, medium filter, cold coil, hot coil (electric heating), humidifier, fan, high efficiency filter.The fan is set at the suction end (most of the ones I have encountered are like this). I personally think that the advantage is that the inhaled wind is relatively uniform. For clean air conditioning, the fan has a partial temperature rise, which relatively reduces the reheat. The disadvantage is that the drainage of condensed water has higher requirements for the condensed water trap. Perhaps the pressure bearing problem of each functional section is also considered.
The medium (high and medium efficiency) air filters should be concentrated in the positive pressure section of the air conditioning system. The process of most functional sections of the air conditioning box is the same as above. Compared with the recommendations in the specification, it will increase the scrapping of high efficiency. There is rust in the fan section. Although this is inseparable from the usual maintenance and equipment selection, similar problems often exist in practice. Primary filter, medium filter.
----------------------------Installation method of high-efficiency filter----------------------------
Make a mounting frame, and use the pressure plate nails to press the bag type and plate type on the front, and there is also a side-drawing type. Pressing type: There is space in the air-conditioning box; side-drawing type: The space in the length direction of the air-conditioning box is limited, and it is also necessary to consider whether there is space after the extraction, that is, the filter should be smaller. There are also purchased filters with installation frames (with flanges), which are simpler and more convenient. hpa200 filters are mainly used to capture dust particles below 0.5um and various suspended matter. Ultra-fine glass fiber paper is used as filter material, offset paper, aluminum film and other materials are used as partitions, and they are glued with wooden frames and aluminum alloys. Each unit has been tested by the nano-flame method and has the characteristics of high filtration efficiency, low resistance, and large dust holding capacity. hepa cartridge filter can be widely used in the air supply of air conditioners at the end of dust-free purification workshops in optical electronics, LCD liquid crystal manufacturing, biomedicine, precision instruments, beverages and foods, PCB printing and other industries. High-efficiency and ultra-high-efficiency filters are both used at the end of clean rooms, and can be divided into: high-efficiency with partitions, high-efficiency without partitions, high-efficiency with large air volume, and ultra-high-efficiency filters according to their structural forms.
The air filter is the core equipment of the air conditioning purification system. The hepa filter ventilation forms resistance to the air. As the dust on the filter increases, the resistance of the filter will increase. When the filter has too much dust and the resistance is too high, the air volume passing through the filter will be reduced, or the filter will be partially penetrated. Therefore, when the filter resistance increases to a certain specified value, the filter will be scrapped. Therefore, when using the filter, it is necessary to grasp the appropriate use cycle. In the case of no damage to the filter, the service life is generally determined by the resistance.
----------------------------Types of filter (high efficiency) efficiency marking----------------------------
Sodium flame method, mainly used by some domestic manufacturers, some small self-employed individuals may also mark this efficiency value without testing equipment. Generally, the efficiency value of high efficiency marking is greater than 99.99%. The prospect of this method: The test accuracy of the sodium flame method determines that this method can only complete the general high efficiency test. The test efficiency is the comprehensive efficiency of the filter, and the efficiency of specific particles cannot be reflected. Although the country is revising this standard, I personally think that if a filter manufacturer only has this test method, it will definitely be difficult to meet the increasingly diverse and high standards of customers.
DOP method, with a history of more than 50 years. It was once the most commonly used marking method in the world. I believe that it may be gradually replaced abroad.
MPPS method, which has gradually become popular in the world, is also called the most penetrating efficiency method. It is considered to be the most stringent method for testing best buy hepa filter. Penetration rate Penetration rate indicates the degree to which dust particles can still pass through the filter. K= (1-et) times 100% Resistance filter forms resistance to airflow. The resistance of the filter is mainly composed of two parts, the resistance of the filter material and the resistance of the filter structure. According to experience, when the filter material performance is determined, the resistance of the filter is closely related to the structure of the filter, and the impact caused by this may be around 50P. The resistance of the filter increases with the accumulation of heat. When the resistance increases to a certain specified value, the filter is scrapped. The resistance of a new filter is called the initial resistance; the resistance value corresponding to the scrapping of the hepa filter 440003905 is called the final resistance. When designing, a representative resistance value is often required to calculate the design air volume of the system. This resistance value is called the design resistance. The usual method is to take the average value of the initial resistance and the final resistance.
----------------------------Dust holding capacity----------------------------
Simply put: the ability of the filter to hold dust. The dust holding capacity of the filter is directly related to the service life of the filter. It usually refers to the dust collection capacity of the filter as the standard dust holding capacity of the filter when the final resistance of the filter in operation reaches one times its initial resistance, or when the efficiency drops below 85% of the initial efficiency. If the h12 hepa filter works with an air volume exceeding the rated air volume, its resistance will increase faster as the dust collection increases. In the process of collecting dust to reach the dust holding capacity, low-efficiency filters tend to show the characteristics of increasing efficiency first and then decreasing. Low-efficiency filters collect large and large dust, and the filter material is sparse. Dust particles easily penetrate the filter material and peel off due to the increase in resistance, causing secondary pollution. During the use of high-efficiency filters, as the dust accumulation increases, the efficiency generally increases. When the air volume is 1000m3h, the dust holding capacity of a general folded non-woven filter is around 100g, the glass fiber filter is 250-300g, and the high-efficiency filter is around 400-500g. If the size of the same filter is different, the dust holding capacity will also be different.
----------------------------Relevant knowledge of high-efficiency air filters in clean air conditioning units----------------------------
Select charcoal hepa filter with high enough efficiency (pre-filtration):
Select filters with large filtration area
High-efficiency air filters must be tested one by one
Under the same air volume, select filters with small initial resistance
Select filters of universal size Common knowledge of h11 hepa filter in clean air conditioning units Filtration.
----------------------------Principle----------------------------
1. Intercept dust particles in the air, move with the airflow inertial motion or irregular Brownian motion or under the action of some field force. When the particles move and hit other objects, the van der Waals force between objects (the force between molecules and molecules, molecular clusters and molecular clusters) makes the particles stick to the fiber surface. Dust entering the h14 hepa filter medium has more opportunities to hit the medium, and will be stuck when it hits the medium. Smaller dust particles collide with each other and stick to each other to form larger particles and settle. The particle concentration of dust in the air is relatively stable. The fading of indoor and wall is due to this reason. It is wrong to treat fiber filters like sieves.
2. Inertia and diffusion Particles of dust move inertially in the airflow. When they encounter randomly arranged fibers, the airflow changes direction, and the particles deviate from the direction due to inertia, hit the fibers and become bonded. The larger the particles, the easier it is to hit, and the better the effect. Small particles of dust move irregularly. The smaller the particles, the more irregular the movement, the more opportunities they have to hit obstacles, and the better the filtering effect. Particles smaller than 0.1 microns in the air mainly move Brownian motion, and the smaller the particles, the better the filtering effect. Particles larger than 0.3 microns mainly move inertially, and the larger the particles, the higher the efficiency. Particles with neither obvious diffusion nor inertia are the most difficult to filter out. When measuring the performance of ac4825dlx high-efficiency filters, people often stipulate the efficiency value of the dust that is most difficult to measure.
3. Electrostatic effect For some reason, fibers and particles may be charged, resulting in electrostatic effects. The filtering effect of filter materials with static electricity can be significantly improved. Reason: Static electricity causes dust to change its trajectory and hit obstacles, and static electricity makes dust stick more firmly to the medium. Materials that can carry static electricity for a long time are also called electret materials. After the material is charged with static electricity, the resistance remains unchanged, and the filtering effect will be significantly improved. Static electricity does not play a decisive role in the filtering effect, but only plays an auxiliary role.
4. Chemical filtration Chemical filters mainly selectively adsorb harmful gas molecules. There are a large number of invisible micropores in the activated carbon material, which have a large adsorption area. In the activated carbon the size of a rice grain, the area inside the micropore is more than ten square meters. After the free molecules contact the activated carbon, they condense into liquid in the micropores and stay in the micropores due to the capillary principle. Some of them are integrated with the material. Adsorption without obvious chemical reaction is called physical adsorption. Some activated carbon is treated, and the adsorbed particles react with the material to generate solid substances or harmless gases, which is called chemical adsorption. The adsorption capacity of the activated carbon material is continuously weakened during use. When it is weakened to a certain extent, the filter will be scrapped. If it is only physical adsorption, heating or steam fumigation can separate the harmful gas from the activated carbon and regenerate the activated carbon. Common knowledge of hepa filter for office in clean air conditioning units China classification General ventilation filter classification For general ventilation filters, two national standards divide filters into five and four grades according to the new c535 filter counting efficiency. These two standards have played a good role in regulating the filter market. They ended the situation of each department fighting for itself and added a high- and medium-efficiency level to the previous medium-efficiency range to meet people's requirements for improving the performance of clean room pre-filters at that time.
----------------------------Specific process----------------------------
1. Determine the efficiency of the final filter according to the cleanliness requirements
2. Select the protection filter of the final filter. If necessary, select the pre-protection filter of the intermediate filter. The filter that usually plays a protective role is called a pre-filter
3. The selection of the pre-filter should be determined after comprehensive consideration of the use environment, spare parts cost, operating energy consumption (currently domestic users are not very concerned about energy consumption), maintenance and supply and other factors;
4. Special attention issues: The h13 air filter at the end of the clean room needs to be protected by a filter with an efficiency not lower than F8 (mainly for the treatment of fresh air), and the air conditioning system also needs the protection of the air filter;
5. Key points for determining the filter: The performance of the final filter should be reliable, the efficiency specification of the pre-filter should be reasonable, and it should be easy to maintain. According to experience, the typical configuration of various occasions: Place Main Filter Efficiency Common Filter Element Special Requirements Function Ordinary Central Air Conditioner Main Filter F5-F7 Bag Type, No Partition Combination Efficiency Reasonable, Easy to Maintain Sanitation, Protect Interior Decoration, Protect Air Conditioner Ordinary Central Air Conditioner Main Pre-Filter G3-F5 Cheap, Easy to Maintain High Dust Holding Capacity, Guaranteed Supply Protect Air Conditioning System, Protect Lower Level Filter High-end Place square hepa filter Structures are Divided into Partitionless and Partitioned. Partitionless mainly uses hot melt as the filter element separator, which is convenient for mechanized production. In addition, it has the advantages of small size, light weight, easy installation, stable efficiency, and uniform wind speed. At present, the large number of filters required for clean workshops mostly adopt the partitionless structure.
Partition with high efficiency, mostly use aluminum foil and paper to make folded shape as filter element separator to form air channel. The partition is made of high-quality kraft paper, hot rolling forming or offset paper as the partition. At present, double-sided coated paper is mostly used as the partition, the main purpose is to prevent the partition from shrinking due to the influence of cold, heat, dryness and wetness, thereby emitting particles.
The non-partition filter for ventilation can avoid the use of metal parts, is easy to dispose of, and meets the increasingly stringent environmental protection requirements. Except for some special occasions with high temperature resistance and high safety requirements, the non-partition filter can replace the partition filter. Filter parameters 3-1 surface velocity and filtration rate The surface velocity and filtration rate can reflect the filter's ability to pass air volume. The surface velocity refers to the air flow velocity on the filter cross section, generally expressed in ms, V=QF*3600, and the surface wind speed is an important parameter reflecting the structural characteristics of the filter. The filtration rate refers to the speed of the air flow passing through the filter area, generally expressed in or cms. The filtration rate reflects the passing capacity of the filter material and reflects the filtration performance of the filter material. Low filtration rate generally can obtain higher efficiency. The filtration rate allowed to pass is low, and the resistance of the filter material is large.
----------------------------Why use air filters----------------------------
Ventilation air conditioning systems need the protection of best cooling fan with hepa filter. Air conditioning maintenance personnel usually find the following problems after the air conditioning system has been used for a long time:
1. The fan heat exchanger, air valve, pipes and other components are seriously dusty and have odors.
2. After the system has been running for several years, the air volume and cold and heat treatment volume are low, and it is difficult to meet the original design requirements.
3. Black stains appear around the air outlet of the comfort air conditioner.
4. Indoor staff complain about dirty air and physical discomfort.
5. The resistance of the Air Conditioning Unit 16x25x1 Hepa Filter in the clean room system increases too fast, and even needs to be replaced every 1-2 years.
6. For the metal nylon mesh and chemical fiber non-woven fabrics currently used in air conditioners, even if they are not cleaned, the resistance will not continue to rise; the main cause of these problems is dust, and the so-called hepa 3000 filter has limited dust blocking. In addition to stopping the air conditioning system for cleaning or replacing expensive system components, a more effective measure is to add air filters with high enough efficiency. To achieve a certain level of cleanliness, a high-efficiency air filter must be installed to filter the air entering the room. The selection of filters should be based on the use requirements of the site. The efficiency of filters at all levels should be reasonably determined. Perhaps I have less contact with it.
----------------------------What is the best arrangement order of each functional section----------------------------
1. The combined air conditioning unit must comply with the following regulations under the specified test conditions: The air flow in the unit should flow evenly through the filter, heat exchanger and muffler to give full play to the role of these devices. The wind speed uniformity on the cross section of the unit should be greater than 80%. According to the process provided above, the pressure of each section of the unit is relatively smooth, and the gradient change is not large, which is conducive to uniform wind speed.
2. The higher the grade of the filter, the closer it should be to the air supply end of the clean system. At the same time, when there is an electrically heated heat coil, it should be arranged on the high-efficiency upwind side, and fire safety measures should be taken. When the primary filter, medium-efficiency filter and best portable air conditioner with holmes hapf30at air filter are all present, the order listed above is more appropriate.
3. In a relatively closed environment where all air parameters are not conducive to the corrosion resistance of the fan section, it seems difficult to avoid metal electrochemical corrosion. Considering the reduction of the corrosion range, whether the motor can be placed outside the unit, the closed treatment of the clean unit should be a key point. I have undertaken several purification projects. The air conditioning units should generally be as follows: primary efficiency, medium efficiency, surface cooling, fan, heating (+ humidification). High efficiency or sub-high efficiency is generally not in the unit, but at the end of the air duct. Small units also have high efficiency on the equipment, but rarely.
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