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  • Home > Anticorrosion Cleaning > Cleaning Technology

    Central air conditioning system cleaning water treatment technology

    Date: 2019-05-11

     A, the wind pipe cleaning equipment


    (1) Special cleaning robot equipment for wind pipe

    (2) Duct detection robot

    (3) Electric soft shaft cleaning system

    (4) Powerful dust suction fan

    (5) Air pipe gas plugging

    (6) Main control box


    B, the wind pipe cleaning scheme


    With the development of today's society, more and more buildings generally use the central air conditioning system to effectively adjust the temperature, relative humidity, airflow velocity and so on, to meet the requirements of indoor working environment. However, due to the lack of timely cleaning of air conditioning systems caused by air pollution has attracted more and more attention, people in the urgent demand to improve the quality of life at the same time, calls for improving the environmental quality of work, residence, places and other public places (especially air quality) is becoming increasingly urgent, Because it's directly related to their physical and mental health. What does central air conditioning bring to modern life?


    1, to create a comfortable environment, in order to facilitate people's work, study and rest, such as: Shopping malls, hotels, office buildings and other public places gathered by people.


    2, to create a suitable indoor climate, in order to facilitate industrial production and scientific research. Such as: textile industry, precision Instrument manufacturing, printing industry and other industries.


    3, the preservation of precious goods, museum reservoirs, library reservoirs and other creative conditions to facilitate their collection, to protect them from mildew, can be preserved for a long time. Central air conditioning if not timely cleaning will bring to life what drawbacks?


    1, the closed space in the air replacement effect is poor:


    As a result of the air conditioning environment, in order to save energy most of the environment is located in a closed, semi-enclosed space, most of the indoor air is recycled, air cleanliness mostly depends on the air conditioning itself filtration and regular transmission of the appropriate amount of fresh air to maintain, so relative to the freshness of outdoor air is more cloudy.


    2, dust accumulation is serious, easy to breed bacteria:


    Because the central air conditioning is dependent on the airway and outlet will be treated air into the rooms, the airway is confined space, and the outdoor air of various types of suspended particulate matter can not be completely blocked by the central air conditioning filter, so the fine dust into the airway adhesion to the inner wall of the airway, coupled with most small airway, closed cleaning difficulties, A great deal of dust has been formed over the other. And thicker dust is very easy to breed a variety of harmful microorganisms, such as: viruses, bacteria, mycin, fungi, Legionella, coronavirus and so on.


    3, It is easy to become the activity space of parasitic animals and insects in the airway:


    Because the air duct layout is mostly in the building ceiling plate, more hidden, coupled with the air duct in the Four seasons temperature and humidity is more appropriate, so often become germs and insect parasitic activities of the space, such as: mice, cockroaches and so on. (According to Shanghai, a building in Shanghai sweeps the central air conditioning duct to sweep out a total of two tons of rubbish, including a large number of rats, insect carcasses.) ) The working principle of central air conditioning:



    1, a lot of dust accumulation. And thicker dust is very easy to breed a variety of harmful microorganisms, such as: viruses, bacteria, mycin, fungi, Legionella, coronavirus and so on.


    2, It is easy to become the activity space of parasitic animals and insects in the airway:


    Because the air duct layout is mostly in the building ceiling plate, more hidden, coupled with the air duct in the Four seasons temperature and humidity is more appropriate, so often become germs and insect parasitic activities of the space, such as: mice, cockroaches and so on. (According to Shanghai, a building in Shanghai sweeps the central air conditioning duct to sweep out a total of two tons of rubbish, including a large number of rats, insect carcasses.) ) The working principle of central air conditioning:


    1, How the new air system works:


    Outdoor fresh air by the wind processor attracted into the wind cabinet, and after filtration cooling dehumidification by the airway into each room, then the new wind can not meet the indoor hot and humid load, only to meet the indoor needs of the new air volume, with the indoor fan coilWhen dealing with the hot and humid load of indoor air, the excess air is discharged outdoors by means of the opening proportion of the valve, and part of it is returned to the inlet to be recycled again (as shown in the figure:)


    2, the working principle of coil system:


    Indoor fan coil When working to inhale a part of the wind cabinet after the treatment of the new air, and then inhale a part of the indoor untreated air after process treatment, by the air vents can absorb the indoor waste heat residual humidity, so that the indoor temperature and humidity to meet the required standards, so circulating work. (As shown in the figure:)


    3, Reasons for dust accumulation in central air conditioning airway:


    Outdoor air through central air conditioning treatment, because most coarse-effect filter can only filter more than 3um of suspended particulate matter, its fine particles with the wind directly into the airway, and the inner surface of the airway seems smooth, but its actual roughness is much higher than the size of fine particles, therefore, These fine particles with the air rolling and the inner wall of the airway collide with each other to produce electrostatic adsorption accumulation, resulting in more and more roughness of the inner wall of the airway, dust adhesion accelerated, so long years of dust accumulated thicker and eventually formed a thicker dust. (As shown in the figure:)


    4, central air conditioning airway dust caused by the harm:


    A, breeding bacteria, infectious diseases: Because the airway through the air vents, vents and indoor formation of relatively closed space, the wind in the airway (generally invisible to the naked eye) and germs will be blown to all corners of the room with the air conditioning winds, gradually become a source of indoor air pollution; At the same time a certain room of germs is also easy with the air conditioning circulating wind blowing to other rooms to form cross-infection. For example, during the "SARS" period, the Ministry of Health ordered the suspension of all air-conditioned central air conditioners indoors to prevent the spread of the epidemic. In the 1976, a major outbreak of Legionella in Philadelphia, the United States, after the study identified its source of infection is central air conditioning in a venue in the city.


    B, wind resistance increase, loss of energy: air flow in the airway, due to viscosity and the relative movement of the fluid, resulting in internal friction, air in the airway flow process, it is necessary to overcome this resistance and consume energy.


    Friction resistance expression: Pm =Λ*l/4rs *ΡΥ2/2

    In the formula:

    Lambda: Friction resistance coefficient RS: Airway hydraulic RADIUS

    Remapped: Airway length rho: air density

    Ν: Average flow rate of air in the airway


    In the passage of time and the increase in the number of years used by the equipment, its surface will be attached to a large amount of dust (suspended particulate matter). This destroys the boundary layer formed by the edge Wall, which destroys the laminar flow state of the fluid in the airway. And the formation of turbulent state, increase the internal friction force, so that the wind is blocked, the load of the fan increases, the unit capacity decline, for the service life of the equipment will be reduced, increase energy consumption.


    Status of central air conditioning cleaning industry at home and abroad:


    a) The status quo of central air conditioning cleaning industry in developed countries abroad: foreign developed countries have long been the application of a large number of central air-conditioning systems, in view of air quality on personal health hazards, foreign people have a relatively deep understanding (1976 in Philadelphia, the United States Legionella outbreak, Afterwards, the study concluded that the source of infection was central air conditioning in a venue in the city. ), Foreign health agencies in the domestic central air-conditioning environment caused by pollution has a more perfect approach, and has introduced a more stringent central air-conditioning use and cleaning regulations, such as: the United States National Duct Cleaning Association developed the industry Standard "HVAC system evaluation, cleaning and repair standards" (ACR2002 version) And Japan's "Japan Air Duct Cleaning Association technical Standards" (version 1990). At the same time, foreign developed countries have advanced central air-conditioning duct cleaning equipment and more perfect cleaning technology, at present, developed countries have set up a central air-conditioning duct Cleaning Association, and has formed into a complete industry.


    b) Domestic central air conditioning cleaning industry Status quo: According to the introduction of China has more than 5 million types of central air conditioning cleaning and maintenance, some centralized air conditioning has been operating for more than 20 years but has never been cleaned, and the relevant State agencies have not yet issued the relevant cleaning regulations (at present, the China Institute of Standardization and the Ministry of Health has drafted the Discussion paper, which is estimated to have been formally implemented in April 2004). With the development of China's economy, people pay more and more attention to the harm caused by indoor air quality, especially the spread of SARS epidemic in the previous period, which has made people have a considerable understanding of the hidden danger caused by central air conditioning to people, and it is expected that in the coming year with the introduction of national mandatory decrees, Duct cleaning industry will become a new development industry in China.


    Introduction to the flowchart of central air conditioning duct Cleaning work:


    1, before cleaning the preparation work:


    a, air duct survey and scheduled cleaning program:

    Agree on cleaning content, scope, type of duct, size and arrangement, time limit, availability of harmful substances (such as asbestos), etc., scheduled cleaning plan.

    b, detection robot pre-inspection.


    2, central air conditioning duct Cleaning process Flow table:


    Central air conditioning Duct Cleaning time arrangement:


    1, the timing: in principle, duct cleaning work in accordance with the zoning, segmentation gradually, to ensure that it does not affect the normal use of central air conditioning outside the cleaning area, the normal work of customers in the building, while ensuring the smooth implementation of the cleaning process.


    2, cleaning project schedule diagram (according to a single set of equipment cleaning 5000m2 wind pipe calculation) central air conditioning Duct Cleaning Quotation:


    Calculation of airway cleaning and area according to airway expansion area


    Specific project quotation in accordance with the actual situation of the wind pipe layout and time arrangements for your unit to provide a detailed report? 

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