Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/222678
Title: EXPERIMENTAL INVESTIGATIONS ON MICROENCAPSULATED N-OCTADECANE FOR PASSIVE COOLING OF CEMENT-BASED MATERIAL
Authors: TAN ZHAO XING CHERYL
Keywords: Building
PFM
Project and Facilities Management
2019/2020 PFM
Microencapsulation
Cement Composite
Thermal Energy Storage
Shah Kwok Wei
Phase Change Materials
Singapore
N-octadecane
Polystyrene
Suspension polymerization
Issue Date: 5-Jun-2020
Citation: TAN ZHAO XING CHERYL (2020-06-05). EXPERIMENTAL INVESTIGATIONS ON MICROENCAPSULATED N-OCTADECANE FOR PASSIVE COOLING OF CEMENT-BASED MATERIAL. ScholarBank@NUS Repository.
Abstract: The rising global warming phenomenon contributed by the increase in energy consumption is evident from Singapore Energy Statics (2019) with a 33.2% increase in total energy input from 2005 to 2018. In order to effectively lower power consumption in Singapore, the adoption of phase change materials (PCM) as thermal energy storage (TES) systems are further explored. With low thermal conductivities and high thermal capacity, it is ideal for PCMs to be integrated into cement-based materials to improve building thermal performance. However, PCMs must be microencapsulated to prevent leakages and any significant variations in volume during phase change. In this study, n-octadecane with a melting point of 28°C to 30°C, was microencapsulated with polystyrene (PS) shell and synthesized successfully using suspension polymerization method. Encapsulation ratio and efficiency obtained was 64.7% and 64.2% respectively, with freezing enthalpy of 145.5 J/g and melting enthalpy of 143.69 J/g. It has thermal stability of up to 170 °C. Compared to other shell materials like calcium chloride and methyl methacrylate, PS shells yield the highest encapsulation efficiency. The microencapsulated PCM (MPCM) was further integrated into cement composite to analyze the effectiveness of MPCM cement composite (MPCM-CC) in building applications. During thermal cycling, MPCM-CC30 showed a drop of 9.8 °C and 6.2 °C for the inner surface temperature and air temperature of the chamber during the heating process. This is significantly higher than the integration of graphite modified MPCM into cement mortar. Therefore, the incorporation of MPCM into cement is proven to be able to improve building thermal performance.
URI: https://scholarbank.nus.edu.sg/handle/10635/222678
Appears in Collections:Bachelor's Theses

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