直接吸收式太阳能集热系统研究综述

对直接吸收式太阳能集热系统及其所用集热介质的研究现状进行了综述。用于直接吸收式太阳能集热系统的集热介质主要有黑色液体、气-固或液-固悬浮体系、熔盐及其三者的相互混合物。在直接吸收式太阳能集热系统中，由于集热介质既是吸热材料也是传热材料，因此，要求集热介质应具有吸收率高、稳定性好、热导率高、与容器相容性好等性能，但是目前传统的集热介质都存在较多的不足，难以推广应用。提出了使用纳米流体作为新一代直接吸收式太阳能集热介质，并对其进行了初步实验，得到了较好的效果。

Review of Direct Absorption-type Solar Energy Collection Systems

The research of direct absorption type solar energy collection systems and solarradiation absorbing materials is reviewed in this paper. The black liquids, suspensions, molten salts and their intermixtures are the main solar radiation absorbing materials for direct absorption-type solar energy collection systems. Since the solar radiation absorbing materials are not only the heat absorbing materials but also the heat transferring materials, the properties of high absorptirity, high stability, high heat conductivity and corisistent well with container are required. However the traditional solar radiation absorbing materials have some disadvantages. Using nanofluids as the new solar radiation collec- ting and heat transferring materials for the direct absorption type solar energy collection systems is proposed in this paper. A new direction is given for the development of solar heat utilization .