技术中心

摘 要 ：水侧的热质传递是热湿处理过程的关键环节。利用火用分析方法阐明了水的两相平衡参数变化的内在联系，提出了适合热湿传递过程分析的水火用表达式，并在此基础上对几种热湿处理过程中水侧的火用传递情况进行了分析，通过实例计算了蒸发水的火用效。结果表明从火用分析得到的饱和水蒸汽分压力方程和克劳修斯-克拉柏龙方程等价；随水温变化，汽化潜热火用和饱和水蒸汽火用变化趋势相反，而水火用却几乎不变；水火用的构成要素在不同的热湿处理过程中的传递和转换关系都不同；直接蒸发冷却过程的火用效最大为23.9%，间接蒸发冷却过程的火用效最大为34％。该研究有助于深化对水侧热质传递过程的认识。 关键词： 火用分析；热质传递；克劳修斯-克拉柏龙方程；火用效 Exergy analysis of heat and mass transfer process of water side Wang Li LI Nian-Ping (College of Civil Engineering, Hunan University, Changsha 410082) Abstract: The heat and mass transfer process of water side is a key factor in temperature and humidity control process. The relationships between phase equilibrium parameters of water are obtained from exergy analysis and the equation of water exergy suitable for analyzing temperature and humidity control process is put forward, then the exergy transfer in several temperature-humidity control processes is analyzed, followed by a case study for exergy efficiency of evaporation water. The results showed that the saturation vapor pressure formula from exergy analysis is equivalent to. The warm exergies of phase change heat and saturation vapor have opposite tendencies with water temperature, but the exergy of water almost remains constant. The exergy transformations between components of water exergy are deferent in temperature and humidity control processes. The maximum exergy efficiency in direct and indirect evaporative cooling process is 23.9% and 34% respectively. This study can help to further the understanding of heat and mass transfer process of water side. Keywords : exergy analsysis, heat and mass transfer, Clausius-Clapeyron equation, exergy efficiency