The study of a novel light concentration and direct heating solar distillation device embedded underground

A novel light concentration and direct heating solar distillation device embedded underground is proposed in this paper. The device is placed under the transparent pavement, which can resist typhoon and doesn't occupy any area of land surface. A method of light path simulation for solving light reception rate is developed. As the result, the reception rate is >95% when the light incidence angle is <25°. A theoretical model of heat and mass transfer is established. Calculation results show that the theoretical efficiency could reach 57%. An experimental device is developed and tested in Nanning city (longitude 108°, latitude 23°), China. The water yield and temperature curves are obtained in actual weather. Experiment results show that the daily water yield of the device on a sunny day reaches 2.95 kg/m2 per unit aperture solar collector area and the water production efficiency is 28.3%, while the effective evaporation efficiency could reach 42.1%.