Spent Coffee Grounds Biochar Composite Phase Change Material Design Challenges in a Lab-Scale Solar Water Heater System for Thermal Energy Storage


Raphael Angelo Mondragon(1), Sasipa Boonyubol(2), Shuo Cheng(3), Jeffrey Scott Cross(4*)

(1) Department of Transdisciplinary Science and Engineering, School of Environment and Society, Tokyo Institute of Technology, 2-12-1 S6-10 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
(2) Department of Transdisciplinary Science and Engineering, School of Environment and Society, Tokyo Institute of Technology, 2-12-1 S6-10 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
(3) Department of Transdisciplinary Science and Engineering, School of Environment and Society, Tokyo Institute of Technology, 2-12-1 S6-10 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
(4) Department of Transdisciplinary Science and Engineering, School of Environment and Society, Tokyo Institute of Technology, 2-12-1 S6-10 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
(*) Corresponding Author


Thermal energy storage systems that use composite phase change materials (CPCM), such as paraffin wax and nonbiodegradable high-density polyethylene, are gaining attention in recent years due to the effort to resolve energy issues. There is a need to undertake research and development on how to prepare durable CPCMs from thermo-chemically treated biowastes, a renewable resource. Raw spent coffee grounds (SCG) have been experimented on previously, but more research needs to be conducted on CPCMs prepared from pyrolyzed SCG-biochar (SCGB) for use in a water tank. This research investigated a biodegradable CPCM made from SCGB and carnauba wax in a lab-scale solar water heater system. The carnauba wax loading of 60% was chosen due to the minimized thermal wax leakage from the PCM. Thermal characterization results revealed that the latent heat of SCGB CPCM is 88.47 J/g which was found to be competitive compared to other biodegradable CPCMs reported earlier. The results also show further potential for using SCGB and carnauba wax as a CPCM in a thermal energy storage system.


Biochar; Phase Change Material; Spent Coffee Grounds; Carnauba Wax; Solar Water-Heater; Thermal Energy Storage

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DOI: https://doi.org/10.22146/ajche.80081

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