本文提出了评估固定式低压微喷头的射流蒸发量及其对顺风范围内小气候影响的计算机模型方程与修正方法。该模型对Crowe等人(1977年)建立的PSI单元模型作了改进,它考虑到了气相(周围的空气)和液相(射流水滴)之间的质量、动量和热能三者的结合问题。至于模型的评定与应用则由其姊妹篇来阐述。 In this paper, computer model equations and correction methods to evaluate the jet evaporation of fixed low-pressure micro-jet heads and their effects on the microclimate in the downwind region are proposed. The model improves on the PSI cell model set up by Crowe et al. (1977) that takes into account the combination of mass, momentum and thermal energy between the gas phase (ambient air) and the liquid phase (jet water droplets). As for the evaluation and application of the model by its sister chapter to elaborate.