Clean room B zone efficiently filter the application of air conditioning unit
At present, the company is planning to build new clean workshop, for key area B district, consultancy advice combined air conditioning unit adopts two units, each have their own fresh air system, the normal operation of the two units each 50% air operation, if the units need to repair or malfunction, another 100% immediately open running mode, delivery to ensure a clean area.
You can run a 100%, and the other one not at ordinary times, but they are connected to the same main duct, water pipe, why to 50% per run, the level of air conditioning fan need to run 24 hours a day, out of the failure probability is very small, now the company the level of the fan motor used for ten years is no problem, standby if the fan has not used, not worry suddenly when using a lot of pieces.
Cases of pharmaceutical factory layout, clean air conditioning system is discussed in each room differential pressure control, the new air volume and its handling, the different airflow organization form of the room.Especially the local laminar flow air supply condole to strengthen supply measures, critical areas in the pharmaceutical technology form uniflow type air distribution so as to improve the air cleanliness of key areas, make the air conditioning system in creating indoor climate with high degree of cleanliness, reduce system energy consumption at the same time.
Standard and related specifications /
【 abstract 】 at present, the air filter in the application of air conditioning and ventilation system more and more, the service life is people care about when choosing air filter of one of the indicators.But in practice it is difficult to predict the service life of air filter, so often let dust is used to evaluate it.
Dust can only qualitative rather than quantitative reflect the actual hold the weight of the dust of air filters, at the same time only test conditions and methods at the same time, can according to the capacity of dust amount of data to evaluate the length of life of different filters.
Due to various reasons, in the past ten years, all across the country, professional laboratory and filter manufacturers seldom let dust test experiment was carried out.The JG/T22-1999 "general ventilation air filter performance test method, the industry standard is revised, should the amount of dust is one of the important content of the revised test method.Combining with JG/T22-1999, the United States ANSI/ASHRAE52.1-1992, the European EN779:2002, Japan JIS B9908:2001 in four air filter performance test methods such as comparison of representative standard definition of should the amount of dust and the test methods are introduced and comparative analysis, to help Yu Guobiao revision work.
1 national standard of the amount of dust is introduced
In JG/T22-1999 for the amount of dust is defined as: a filter in the reach test of termination conditions were intercepted before the artificial total dust, it by artificial dust dust total quality x subjects to the filter efficiency of average weight calculated;Let dust test method is: through the hair send a certain amount of artificial dust to dust device equipped with subjects filters and filter (hepa filter) normally at the end of the standard test duct, until send after artificial dust, remove the subjects filters and filter at the end, weighing respectively, it is concluded that the quality variation, calculated with the filter efficiency, repeat the above steps until a filter to achieve the end resistance value, then the average weight of the whole test process efficiency, and finally by average weight efficiency by the total amount of dust capacity of filter dust capacity.
EN779:2002 to let the amount of dust and let dust test method and the definition of JG/T22-1999 almost unanimously, ANSI/ASHRAE52.1-1992 only in terms of let dust test terminated with JG/T22-1999 is different, other content is consistent;And JIS B9908:2001 in addition to let dust test termination conditions and calculation method is not the same, other also and JG/T22-1999 the contents of the same.So let dust capacity of each standard test method is primarily the termination conditions and calculation method has some difference.Table 1 lists the various standards for dust test termination conditions and calculation method.
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