Validation of a Model for Predicting the Performance of Evacuated Tube Solar Collectors Based on Internal Parameters of Heat Pipes

A research has been conducted on solar collectors using heat pipe, investigating the various factors influencing their operational efficiency. Initially, the prevailing belief was centered around two key determinants impacting the functionality of the heat pipe: the internal liquid composition and internal structure. However, a novel heat pipe was developed and conducted comprehensive experiments varying both liquid compositions and structural configurations were conducted. Employing mathematical analysis, they sought to ascertain the influence of these variables on the efficiency of the heat pipes. Disappointingly, the initial results did not align with expectations, prompting a reconsideration of the governing factors. An alternative hypothesis emerged, suggesting that the boiling point temperature of the liquid might hold precedence over its other inherent properties concerning the performance of the heat pipes. Subsequently, an additional mathematical analysis was undertaken, yielding promising outcomes. The resultant mathematical model exhibited exceptional accuracy, boasting an R2 value of 0.98 and a mere 1.1% average error. This high degree of accuracy indicates that the model is proficient in predicting the operational efficiency of a heat pipe, even when encountering differing structural shapes or liquids with distinct boiling temperatures.