Utilization of paraffin wax as phase change material for solar thermal energy storage

Paper ID: 
Energy technologies and sustainability
Published under CEST2021
Proceedings ISBN: 978-618-86292-1-9
Proceedings ISSN: 2944-9820
(Corresponding) Shalaby S., Kabeel A., Fleafl A.
In this work, a thermal energy storage system based paraffin wax as phase change material (PCM) was designed, constructed and tested when it was integrated with a solar water heater (SWH). For the purpose of comparison, the SWH was also tested when water was used as a storage medium. The system was tested for successive days at different mass flow rates of the heat transfer fluid varied from 0.08 to 0.16 kg/s. The maximum energy stored in 110 kg of water used as storage material is 15.9 MJ/day, compared to 11.9 MJ when 50 kg of paraffin wax was used as storage material. This means that the PW not only capable of store 75% of the energy stored in water per day but also it achieves a 50% reduction in the storage volume. The low storage temperature gives also more superiority to the wax as storage material especially in the domestic application where just warm temperature is needed.
solar water heater, PCM, paraffin wax, energy storage