Scientific life: regular cleaning is conducive to energy-saving central air conditioning – central air conditioning, refrigeration, energy saving – HVAC Industry
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According to incomplete statistics, China has more than 5 million units of various types of central air conditioning use, and is 10% per year rate of increase. However, in the central air conditioning, a considerable part of the run for more than 20 years but never cleaned, inspected more than 90% of bacteria present in the central air conditioning system or dust pollution.
Into 3 months, Beijing's central air cleaning business has been booming carried out again. Some cleaning companies received more than 20 a day to document business. This is clearly last year, Beijing issued "public places, central air-conditioning ventilation system health management practices" brought about change.
Then, Beijing Why make such a mandatory requirement?
Bacteria higher than the standard central air-conditioning
As central air-conditioning the air inside modern buildings dominate the metabolism, is one image of the modern building known as the "lungs." Lobe delicate, vulnerable to evil invasion, it is also known as "Jiao dirty", the same token, central air conditioning can easily be dirt bacterial invasion. Long-run central air conditioning units, ventilation systems vulnerable to pollution, combined with cleaning and other reasons not in time to make the pipeline a lot of dust, sand retention, carbon substances, acid. Once the dust of which is attached to the bacteria, fungi, yeast and other microorganisms, it is easy for people suffering from allergies or respiratory diseases.
Beijing CDC in 2003 to end 2005, has been divided into 4 stages on the central air-conditioning in public places, the health status of sampling, the results show that the place was seized more than 90% are moderate pollution; Similarly, Shandong Provincial Health Authority, and provincial CDC also of Jinan, Zibo, Tai'an City, 30 3, central air conditioning and ventilation systems in public places carried out sampling. The results showed that a moderate pollution, which has nine, there were 21 serious pollution; including a mall excessive use of central air-conditioning as much as 190 times more bacteria.
Duct dust can easily spread germs
Common central air mainly by the air handling units and hot and cold air with the two major components. Air handling unit is responsible for cold and hot air treatment, the treated air is delivered to each room through the duct, due to relatively large duct walls humidity, airborne particulate matter is easily adhere to here, over time the formation of thick dust. Dust into breeding these germs paradise, because there are survival needs of nutrition, proper temperature and humidity, the virus would be happy to live here, reproduction and dissemination.
The World Health Organization statistics show that indoor air pollution than outdoor air pollution burden of disease caused by 5-fold. Research data also supported this argument. Europe and the United States the institution had the central air conditioning system for indoor air pollution caused by numerous studies, the results show that the environment in a central air conditioning, 42% of the pollution comes from it, in all the largest share of pollution sources. In 2006, China's Ministry of Health on the sampling results of the national central air conditioning also confirmed this problem. Send detected by the air conditioning sanitary quality of the most serious problem, the total number of bacteria exceeded the national average of 36.9%, respirable particles exceeded 29.6%.
Favorable cleaning central air-conditioning energy saving
According to the survey, according to international practice, central air cleaning and maintenance each year to a science, otherwise there will be biofouling plug, thus affecting the central air conditioning cooling effect, a waste of energy, increasing maintenance costs. According to Japan's Kurita Water Company information provided by the Health Scale 0.2? 0.5mm thickness, 33% reduction in heat transfer efficiency, energy consumption increased by an average central air conditioning is running about 20%.
Has engaged in the design and manufacture of central air conditioning, central air conditioning are now engaged in cleaning work, said senior engineer Chen Liqing, the present, central air conditioning duct cleaning equipment costs are relatively high, resulting in clean-up costs high, it is At present a number of properties, not timely cleaning of central air system, the main reason.
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