Many efforts have been focused on enhancing the vapor generation in bi-layer solar steam generation systems for obtaining as much pure water as possible. However, the methods to enhance the vapor temperature is seldom studied although the high-temperature vapor has a wide use in medical sterilization and electricity generation. In this work, to probe the high-temperature vapor system, an improved macroscopic heat and mass transfer model was proposed. Then, using the finite element method to solve the model, the influences of some main factors on the evaporation efficiency and vapor temperature were discussed, including effects of the vapor transport conditions and the heat dissipation conditions. The results show that the high-temperature vapor could not be obtained by enhancing the heat-insulating property of the bi-layer systems but by applying the optimal porosity and proper absorbers. This paper is expected to provide some information for designing a bi-layered system to produce high-temperature vapor.

许多努力集中在增强双层太阳能蒸汽发生系统中的蒸汽产生上，以获得尽可能多的纯净水。然而，尽管高温蒸气在医学消毒和发电中具有广泛的用途，但是很少研究提高蒸气温度的方法。在这项工作中，为探究高温蒸汽系统，提出了一种改进的宏观传热传质模型。然后，利用有限元方法对该模型进行了求解，讨论了影响蒸发效率和蒸汽温度的一些主要因素，包括蒸汽传输条件和散热条件的影响。结果表明，不能通过提高双层体系的隔热性能来获得高温蒸气，而要通过应用最佳孔隙率和合适的吸收剂来获得高温蒸气。预期本文将为设计双层系统以产生高温蒸气提供一些信息。