Central air conditioning chiller water system and ventilation system cleaning method

Central air conditioning chiller water system and ventilation system cleaning method

The central air-conditioning ventilation system mainly includes air ducts, fresh air ducts, central air-conditioning wind cabinets, air supply outlets, air-sealing outlets, air handling units, and fan coils. During the long-term operation of the air-conditioning system, dust deposition and blockage are prone to occur, causing problems such as the growth of microorganisms, the obstructed wind, the decrease of unit capacity and the increase of compressor power consumption. The fundamental way to solve these problems is to thoroughly clean the air conditioning and ventilation system. However, if the cleaning is not performed in accordance with the standard technical requirements, the dust, bacteria and microorganisms in the ventilation ducts will cause great harm to the surrounding environment, cleaning personnel, air-conditioning users and air-conditioning equipment.

　　 Air conditioning water system cleaning

　　 Because the inner surface of the air-conditioning water pipe is mainly composed of Ca2, Mg2, Fe2 and other compounds, that is, scale, which is neutral. Use 8‰~10‰ neutral detergent, corrosion inhibitor, and coating water solution to clean three times. The first cycle is continuous for 12 hours, the second cycle is continuous for 6 hours, and the third cycle is continuous for 1 hour, and timely detection of water quality and water pipe surface conditions. Generally, it can be cleaned after three times of cleaning. For the air-conditioning water pipes that have not been cleaned for a long time, the cleaning time should be extended appropriately when cleaning the third time.

　　 Cooling water system cleaning

Because most of the cooling water system is an open circulation system, the cooling water is in contact with the air for a long time, and the CO2, SO2, NO2, O2 and other gases in the air will dissolve in the cooling water and show acidity and strong oxidization (such as the impeller of the cooling water pump) Cavitation occurs). Over time, the cooling water pipe, the surface of the packing, and the water collecting pan form a kind of pathogenic microorganism attachments containing Legionella pneumophila, b-hemolytic streptococcus, algae, O2, etc., which seriously corrodes the water pipe and pollutes Environment (acid rain near the cooling tower). Therefore, use an acidic cleaning agent, 5‰ weak acid scale remover, corrosion inhibitor, and coating water solution for three times. The cleaning procedure is the same as above.

　　 ventilation duct system cleaning

　　 The cleaning of the ventilation duct system is a key difficulty in the cleaning work, because the ventilation ducts are generally in the ceiling, even if they are not in the ceiling, because the air pipes are sealed, it is difficult to clean. Mechanical cleaning methods are often used. The common cleaning method now is to place the detection robot or pneumatic robot in the ventilation duct from the soft connection of the canvas of the unit, and control the cleaning robot in the ventilation duct through the robot control box outside the duct. For duct systems with more dust A duct dust collector must be used to thoroughly collect the garbage in the pipeline to prevent secondary pollution.

　　 Surface cooling, heating, humidifier surface, inner surface of condensate pan, and cleaning of air outlet

　　The cleaning of the surface cooling, heating, humidifier, and return air outlet can not only improve the air quality, but also have a strong energy-saving effect. The commonly used cleaning method is to use air spray cleaning agent, and then use high-pressure water or air to purge, so that the dirt is quickly dissolved and blown away, and then rinse with low-pressure water. The contaminants attached to the outer surface of the surface cooler contain pathogenic microorganisms such as hemolytic streptococcus. After the fins are cleaned, most of them flow into the condensate water tray. Long-term accumulation will cause secondary pollution of the water tray and accompanied by peculiar smell. Therefore, the condensate pan cleaning cannot be ignored. The common way to clean the condensate pan is to spray detergent on the condensate pan and then rinse it with clean water.

　　 The above is an introduction to the cleaning method of the central air-conditioning chiller water system and ventilation system. Only by paying attention to the management of the central air-conditioning system and timely cleaning and maintenance can we ensure that the performance of the central air-conditioning equipment is intact, increase the life of various equipment and facilities, and ensure the normal and safe operation of the equipment.