The Studies on Microbiological Contamination of Air Conditioning Systems.

（1）空调建筑物微生物污染状况：3所医院和4所办公楼在使用状态下空气中细菌和真菌颗粒物的浓度、变化、粒径分布。许多关于污染影响的数据都来自空调系统。（2）研究了空调系统污染的机理及其对室内环境的影响：空调系统微生物污染状况、气溶胶产生的种类、数量及空调设备的气溶胶产生模式。在运行期间，系统的启动、停止或打开检查口等干扰会增加系统中微生物颗粒的产生，一般来说，在稳态运行时其速率较低。室内空气中细菌颗粒物的浓度主要取决于室内人员的活动，而真菌颗粒物的浓度主要取决于空调系统的产生。（3）评价方法：获得了空气微生物粒子收集器的基本性能指标。针对大粒径颗粒对沉降板计数值影响较大的问题，研制了8级Andersen生物颗粒采样器。（4）空调系统微生物污染的评价：沿着稳态和扰动状态下的微生物测量，非生物颗粒物的散射光式颗粒计数器测量是很有必要的。要实现这一目标，还需要许多其他科学技术的发展。

(1)The Status of microbiogical contamination of air-conditioned buildings: the concentration, its variation, size distribution of airborne bacterial and fungal particles in 3 hospitals and 4 office buildings in occupied state. Many data on the effects of contamination originated from the air-conditioning systems.(2)The mechanisms and the influences to the indoor environment of contamination of the air-conditioning systems: state of microbiological contamination, species, quanitities of aerosol generation, and its patterns of air-conditioning apparatus were investigated. The generation of microbiological particles from the systems are increased by the disturbances such as starting, stopping of the system, or opening the inspection port during the operation, its rate is generally speaking low at the steady state operation. The concentration of bacterial particles are determined by the activity of occupants and that of fungal particle might be by the generation from the air-conditiong systems.(3)Method of evaluation: the basilc dharacteristics of collection apparatus of airborne microbiological particles were obtained. The larger size particles were found to have grave influences on the values of settle plate counts, we developed a 8 stage type Andersen sampler for biological particles.(4)Evaluation of miocrobiological contamination of air-condioting systems: along with the microbiological measurement at steady state and disturbed state, nonbiological particle measurements using scattered light type particle counters are desirble. Many other scientific and technical developements are required to acomplish this target.