Microencapsulation of Paraffin with Poly (Urea Methacrylate) Shell for Solar Water Heater

Weiguang Su, Yilin Li, Tongyu Zhou, Jo Darkwa, Georgios Kokogiannakis and Zhao Li
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Weiguang Su: School of Mechanical & Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
Yilin Li: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Tongyu Zhou: Department of Architecture and Built Environment, University of Nottingham Ningbo China, Ningbo 315100, China
Jo Darkwa: Faculty of Engineering, University of Nottingham, Room B20 Lenton Firs, University Park, Nottingham NG7 2RD, UK
Georgios Kokogiannakis: Sustainable Buildings Research Centre, University of Wollongong, Building 237, Squires Way, Fairy Meadow NSW 2519, Australia
Zhao Li: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China

Energies, 2019, vol. 12, issue 18, 1-9

Abstract: Previous research has demonstred that microencapsulated phase change materials (MEPCMs) could significantly increase the energy storage density of solar thermal energy storage (TES) systems. Compared with traditional phase change materials (PCMs), MEPCMs have many advantages since they can limit their exposure to the surrounding environment, enlarge the heat transfer area, and maintain the volume as the phase change occurs. In this study, a new MEPCM for solar TES systems is developed by encapsulation of paraffin wax with poly (urea formaldehyde) (PUF). The experimental results revealed that agglomeration of MEPCM particles occurred during the encapsulation process which affected the uniformity of the particle size distribution profile when sodium dodecyl sulfate was used as an emulsifier. The differential scanning calorimetric (DSC) analysis results showed that the melting temperatures were slightly increased by 0.14–0.72 °C after encapsulation. A thermogravimetric (TG) test showed that the sample weight decreased while the weight loss starting temperature was slightly increased after encapsulation. Overall, the sample UF-2, fabricated with the binary emulsifiers of Brij 35 and Brij 30 and 5% nucleating agent, resulted in good particle dispersion and shell integrity, higher core material content and encapsulation efficiency, as well as improved thermal stability.

Keywords: solar energy; thermal energy storage; microencapsulation; phase change material; poly (urea formaldehyde) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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