A Case Study: Distribution of Bacterial and Fungal Aerosols in Air-Conditioning Systems in Shaanxi History Museum

In order to investigate the bacteria and fungi aerosol characteristic distribution in HVAC-system and its components at Shaanxi History Museum.Measurements were performed to probe the bacteria and fungi aerosol in HVAC systems,located at Xi'an city,China.The results showed that there was fungi growth inside the ventilation ducts,fungi contamination was worse than bacteria,and both of them were distributed into occu-pied space with the air supply ducts.The dominating genera of fungi was found to be Penicillium spp. and As-Pergillus spp.,which was respectively 46.1%and 20.7% in settling fungi, and the dominating genera of fungi in dust were Cladosporium spp.and Penicillium spp., which was 41.8%and 30.1%respectively.It suggests that available measures to improve and control the performance of HVAC-systems such as the maintenance,management and cleaning should be taken to prevent this pollution and to develop strategies to keep this pollution away.     

空气热湿处理的不可逆热力学分析及Le研究

对空调中典型工况下空气处理过程进行了不可逆热动力学分析；在此基础上，建立能反映实际传递不可逆热动力学５的理论模型；利用实验测出的空气和水膜温度沿板长方向的分布，导出基本方程组中所需的状态参数和相关热力参数，通过对理论模型的数值积分，得到Ｌｅｗｉｓ数取值在０．１－１．５范围内对热湿交换过程计算精度的影响。     

Evaporative Condensers in Comfortable Air Conditioning System

The operating theory of an evaporative condenser was expatiated.The difference between an e-vaporative condensing refrigeration system and a general refrigeration system was analyzed.Compared with the air-cooled and the water-cooled,the virtues of energy-conservation and water-conservation of evaporative con-densers were analyzed.Some questions existing in the application of evaporative condensers were pointed out,the corresponding solving methods were analyzed accordingly,and the development trend of evaporative con-densing technique in mechanical refrigeration system field and the applied foreground of evaporative condensers in comfortable air conditioning were prospected.