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一、问题的提出生产代替盐水瓶的一种塑料袋是上海达达塑料厂的主要产品。用这种袋子盛装血液和盐水在战场上使用极其方便。由于生产这种袋子的特定工艺和特殊要求,所以对车间内环境气候要求比较典型。除了对空气的温湿度和洁净度有要求之外,还有压力和局部排风要求。按照设计,室内应当有1～2mmH_2O的正压,而实际情况是室内无正压,有时还会出现负压,这样,室外脏空气就会通过门窗的缝隙进入室内,从而影响到室内空气洁净度,使产品合格率降低。设计人员是严格按照传统的方法来计算新风量的,即按照正压要求,局部排风和
I. Proposal of the problem The production of a plastic bag instead of a salt water bottle is the main product of Shanghai Dada Plastics Factory. It is extremely convenient to use this kind of bag for blood and salt water on the battlefield. Due to the specific processes and special requirements for producing such bags, the environmental climate requirements in the workshop are typical. In addition to the air temperature and humidity and cleanliness requirements, there are pressure and local exhaust requirements. According to the design, the room should have a positive pressure of 1 ~ 2mmH2O, and the actual situation is no positive pressure indoors, and sometimes negative pressure, so that outdoor dirty air will enter the room through the gap in the doors and windows, thus affecting the indoor air cleanliness , to reduce the product pass rate. The designer is calculating the fresh air volume in strict accordance with the traditional method, that is, according to the positive pressure requirements, the local exhaust air and