Centralized air conditioning cleaning and disinfection and effect evaluation
Cleaning of general parts:
In response to air treatment unit inner surface, water retaining plate, condensation water plate and condensation water pipe, fan, exhaust fan, air pipe and coil surface and components of all the components and other pollutant deposition cleaning. For direct cleaning difficult areas can be opened to clean the mouth of the maintenance. A place that can not be cleaned between the heating and cooling coils of an air handling unit can be removed or removed after removal of the coil.
The cleaning method used should ensure that all parts of the ventilation system meet the requirements of visual cleanliness.
The regulating valve, shutter, grille diffuser and other air regulating device for cleaning and removing, should be returned to in situ. The opening of the maintenance port should also meet the needs of cleaning and repair.
When the electric heating coil is cleaned, the power supply of the coil pipe should be disconnected, and the identification of the locking or hanging. For wet cleaning, only the use of non corrosive cleaning agents, coil in re use should be washed off before the chemical preparation and completely dry.
Cleaning of glass fiber components:
The contact type vacuum cleaning equipment with high efficiency filter or other suitable equipment shall be used for cleaning the glass fiber parts thoroughly. The glass fiber is not in the process of cleaning.
The use of the cleaning method does not deal with the damage to the glass fiber parts, and the parts to achieve visual cleaning requirements.
Cleaning of biological contaminants:
Cleaning methods: the surface of the ventilation system should be cleaned by mechanical cleaning methods to remove dust particles, debris, nutrients and surface contamination. After cleaning the surface should meet the requirements of visual cleanliness.
The contaminated porous materials should be replaced as much as possible. The porous material base, which is located under the porous material, should be cleaned before installing the new porous material.
When the contaminated porous material can not be replaced, as a temporary control measures to deal with no replacement of the porous material surface should be cleaned.
4 if the use of paint or sealant surface treatment of contaminated porous materials, only as a temporary control measures, to guarantee the material surface integrity.
The use of pesticides, disinfectants and surface processing should be carried out on the surface after cleaning. Pesticides, disinfectants and coatings should be strictly in accordance with the manufacturer's instructions.
The cleaning of ventilation system: using a special mechanical cleaning equipment to remove all visible pollutants inside the pipe ventilation. Before cleaning, the work should be set to the entrance, cleaning construction units can be used in different parts of the air conditioning system work out of human and machinery, and the corresponding cleaning and inspection work. If necessary, cut the other entrances, and ensure that they are sealed after the construction.
Disinfection method:
Under normal circumstances should be first on the centralized air conditioning systems or components of the cleaning, reached the corresponding health requirements to carry out disinfection, and should be according to the pollution situation of the system specific parts (parts), for disinfection treatment. Disinfection measures should be taken for the whole air conditioning ventilation system during the period of the occurrence and epidemic of air borne infectious diseases.
1, in the transmission of airborne infectious disease occurrence and epidemic period using ventilation, first of all to ensure air safety, should be in the fan room, return air filter placement ozone ultraviolet lamp. When necessary to deal with the whole supply wind equipment and air supply pipeline with 500 ~ 1000 mg / L chlorine disinfectant solution to wipe disinfection, or using peracetic acid or ozone fumigation.
2, for the air conditioning and ventilation system of fresh air room, indoor air (back) air inlet, filter and other key parts of the implementation of regular disinfection.
3, on the air conditioning system of parts surface disinfection can choose a variety of chlorine containing disinfectant, the wind pipe inner wall for disinfection, to ensure its security personnel using peracetic acid or ozone, disinfection method in detail see Table 1.
Table 1 disinfection methods of air conditioning system components
Effect time of disinfection method of disinfection object
The filter of chlorine containing disinfectant (available chlorine 250-500mg/L) for 15-30 min.
Cooling water and condensed water disinfectants (chlorine 36.5mg/L) on 30 min.
Condenser, condensing plate (available chlorine chlorine disinfectant wipe or spray 30 min. 1000-2000mg/L)
The inner wall of the air pipe (1g/m3) was 1 h.
Ozone (20-30mg/m3)
Object surface disinfection, in addition to the use of chlorine containing disinfectants can also be soaked or wet wipe disinfection using 0.2-0.5% Peracetic acid, chlorine dioxide disinfectant (250-500 mg / L), after 15 minutes then rinse.
4, according to the cooling water disinfection, if confirmed it is not pollution or less pollution, use no corrosion or low corrosion disinfectant, such as according to the amount of circulating cooling water, added benzalkonium bromide (new clean Er die) solution, the concentration reached 0.1%; or according to the above method selected chloride selective chlorhexidine (chlorhexidine disinfectant), make the action concentration 0.5%; or added with 5 ~ 10 mg / L chlorine dioxide disinfectant concentration. Function time: generally for 30 minutes, chlorine dioxide disinfection 5 ~ 10 minutes or more can be.
5, in public places, indoor environment, in addition to strengthening natural ventilation, if necessary can use lactic acid and acetic acid peroxide, ozone Yaoxie air and surface disinfection.
The air disinfection method:
Under the circumstances, it is confirmed that the environment has not been contaminated, can be used for the prevention of lactic acid fumigation disinfection, dosage: 2mL/10M2, recommended: 1-2 times a week if necessary. In the case of people not in the use of circulating wind ultraviolet (dynamic) air disinfection for regular disinfection, the effect is ideal.