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High solar cell temperature has always been a major concern when designing a concentrated solar power (CSP) system. Exceeding the operational cell temperature will result shorter cell life and even cell damage under extreme solar concentration. Currently, active cooling methods such as using water circulating devices are applied to control the elevated cell temperature. However, power parasite and risks of mechanical failure are always associated with these cooling devices.

Passive cooling methods are simpler and reliable than active cooling but not very effective for high solar concentrating applications. Many research works have been conducted on improving passive cooling performance in the past decades but the outcomes are insignificant. The main problem faces by passive cooling methods is the natural cooling rate is very dependent on the ambient conditions. Low wind speed and high ambient temperature will significantly affect the cooling performance of any passive devices. In this regards, phase change material thermal storage (PCMTS) is implemented to improve the existing passive cooling limitations.