Solar-thermal conversion and thermal energy storage of different phase change materials

In the present study, various phase change materials (PCMs) in combination with thermoelectric device were evaluated to storage solar energy and generate electricity. The PCMs were Rubitherm 35HC and Rubitherm 42, as industrial PCMs, along with margarine, sheep fat oil, and coconut oil, as edible PCMs. The main aim was to improve energy storage and cost-effective continuity of electricity generation in the absence of radiation by PCM with a longer shelf life. The results showed that energy storage materials can significantly impact electricity generation, particularly in the absence of radiation. Also, the storage efficiencies of different PCMs varied significantly when honeycomb fins were used. As a result, Rubitherm 35HC achieved the best performance with a storage efficiency of 71%, while sheep fat oil had the worst performance with a storage efficiency of 27%. Also, Coconut oil, margarine, and Rubitherm 42 recorded the storage efficiencies of 36%, 29%, and 47%, respectively. Rubitherm 35 not only significantly enhanced the energy storage efficiency but also resulted in a notable augmentation of voltage production by over 200%, compared to the circumstance when no PCM is used. Furthermore, the incorporation of honeycomb fins further amplifies this percentage to 222%.