The solar tower power plant (STPP) is one of the most renowned technologies for large-scale renewable electricity production. The solar field of STPP is made up of several hundreds of mirrors, known as heliostats. The orientation of each heliostat is time dependent and follows the actual sunpath in two-dimensions and focuses the solar flux to the receiver. There is a strong relationship between the solar geometrical factors and the amount of solar flux reflected from the mirror to the receiver. The present paper aims to evaluate critically the time-variant performance of inclined heliostat solar field and examines the performance in reference to the distinctive positions of sun-earth geometry (solar solstices and equinoxes) and solar geometrical factors. The analysis encompasses the criticality of the investigations in terms of cosine efficiency, shadow and blocking efficiency, field optical efficiency, intercept efficiency, flux distribution on the receiver, etc. It is observed that the average field efficiency is the highest at equinox with 76% followed by winter solstice (73%) and summer solstice (68%). It is observed that in the morning and evening time when the zenith angle is high during winter solstice and equinox, the field optical efficiency of the inclined surface solar field increases 12–13% and 1%, respectively, in comparison to the flat surface solar field. The average total shadow-blocking-intercept efficiency of inclined surface solar field is found to be 11.28%, 4.66%, and 6.23% higher than flat surface solar field during the winter solstice, summer solstice, and equinox, respectively. In the present analysis, atmospheric attenuation efficiency is found to be 0.2% higher for the inclined surface.

太阳塔发电厂（STPP）是大规模生产可再生电力的最著名技术之一。STPP的太阳场由数百面镜子组成，称为定日镜。每个定日镜的方向是时间相关的，并且按照实际的二维路径行进，并将太阳通量聚焦到接收器上。太阳几何因素与从反射镜反射到接收器的太阳通量之间存在很强的关系。本文旨在严格评估倾斜定日镜太阳场的时变性能，并根据太阳地球几何体（太阳溶胶和春分点）的独特位置和太阳几何因素来检查其性能。该分析涵盖了余弦效率方面调查的重要性，阴影和阻挡效率，场光学效率，拦截效率，接收器上的通量分布等。观察到，在春分时平均场效率最高，为76％，其次是冬至（73％）和夏至（68％）。 ）。观察到，在冬至和春分期间，在天顶角较高的早晨和傍晚时分，与平面太阳光相比，倾斜表面太阳光的场光学效率分别提高了12–13％和1％。领域。在冬至，夏至和春分期间，倾斜表面太阳场的平均总遮挡拦截效率分别比平坦表面太阳场高11.28％，4.66％和6.23％。在本分析中，发现大气衰减效率为0。