基于旋转强化的漂浮式太阳能界面蒸发器研究

Abstract Heat-driven air-conditioning systems powered by renewable energy are vital for achieving energy saving and emission reduction of buildings. However, the development of these systems is currently constrained with low efficiency due to high thermal loss in regenerating working medium. To improve, the solar-driven interfacial evaporation (SDIE) method has been proposed to enhance the efficiency by localizing heat at the regeneration surface and reducing energy wasted in heating the whole solution bulk. Though much higher efficiency achieved with floating SDIE device, further improvement can be made by intensifying the convective mass transfer of evaporation at the surface. On this thought, this study proposes an improved SDIE method incorporating with three different intensified modes, including rotating regenerator, regenerator with a blade rotating at surface and regenerator with a blade rotating above surface. The performance of these modes has been analyzed with experimental comparison. The results show that the efficiency of the mode with a blade rotating above surface was the highest, reaching 94.08%. It was 90.98% higher than that of the traditional SDIE method. CaCl 2 solution was found as the most suitable desiccant. Given the low manufacturing cost, wide applicable concentration, flexible installation and high thermal efficiency, the SDIE regenerator based on the rotation intensified modes show great potential for future application.