微尺度通道平板集热器的实验研究与数值模拟

Experimental and numerical investigation of a flat-plate solar collector with a micro-channel

将太阳能平板集热器流道设计为间距为0.7 mm的平行微尺度通道,这种微尺度通道集热器的特点是吸热板和底板之间距离较小,流体与吸热板间的传热系数较大,水的质量流率低,热容小,可使水温快速提升。通过对微尺度太阳能集热器与传统尺度太阳能集热器传热性能的分析对比,可看出微尺度集热器在水的升温速率和对流传热系数方面有显著的优越性,为太阳能集热器用于海水淡化提供了一条高效应用的途径。

The flow channel of flat-plate solar collector is changed to micro-channel. The distance between two parallel plates is designed to be 0. 7 ram. The flat-plate solar collector with a micro-channel is characterized by a smaller distance between the absorber plate and the bottom plate. It has high coefficient of heat transfer between the fluid and the heat absorbing plate, low mass flow rate and small heat capacity. So the flat-plate solar collector can make the water temperature increasing rapidly. Compared with the traditional flat collector, the flat-plate solar collector with a micro- channel has obvious superiority in coefficient of heat transfer and the heating rate. It provides an efficient way of application for seawater desalination.