The present invention relates to a performance analyzing method for a solar thermal system. To be more specifically, the performance analyzing method for a solar thermal system can conveniently identify the efficiency of the solar thermal system in advance by inputting information of a solar thermal system according to a list set in a program and then executing the program in order to analyze performance of the solar thermal system through a calculation formula set in the program. In addition, the performance analyzing method for a solar thermal system can save hours and costs through simulation prior to the installation of the solar thermal system by analyzing performance according to installation position and conditions of the solar thermal system.
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