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针对复合抛物面集热器(compound parabolic collector,CPC)作为二级反射器和单层玻璃盖板的反射式线性菲涅尔中高温集热系统(linear Fresnel reflector concentrator,LFRC)的集热性能,基于稳态传热平衡原理,建立了集热系统稳态传热模型。系统地研究了风速、温度、太阳辐照度、聚光比、传热工质流速和流体进口温度等参数对接收器集热性能的影响,并给出了沿接收器管长的温度和能量分布情况。数值模拟结果表明:对于该集热系统,太阳辐照度、聚光比和工质进口温度是影响集热性能的关键影响因素,最高可达到72%,风速和环境温度对集热效率影响较小。因此增加接收器的长度能够很好地提高集热温度。
The heat collecting performance of a linear reflective linear Fresnel reflector concentrator (LFRC) for a compound parabolic collector (CPC) as a secondary reflector and a single-glazed glass cover is based on Steady-state heat transfer and balance principle, established steady-state heat transfer system heat transfer model. The effects of wind speed, temperature, solar irradiance, concentration ratio, flow rate of heat transfer medium and inlet temperature of fluid on the heat collecting performance of the receiver are systematically studied. The temperature and energy along the length of the receiver are also given. Distribution. Numerical simulation results show that the solar irradiance, the concentration ratio and the inlet temperature of working fluid are the key factors that affect the heat collecting performance of this system, up to 72%. The wind speed and ambient temperature have little effect on the heat collecting efficiency . Therefore, increasing the length of the receiver can improve the collector temperature.