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Technical Briefs

Enhance the Thermal Storage of Cement-Based Composites With Phase Change Materials and Carbon Nanotubes

[+] Author and Article Information
Baoguo Han

Department of Mechanical and Energy Engineering,
University of North Texas,
Denton, TX 76203;
School of Civil Engineering, Dalian University of Technology,
Dalian 116024, China

Kun Zhang

Department of Mechanical and Energy Engineering,
University of North Texas,
Denton, TX 76203;
School of Civil and Safety Engineering,
Dalian Jiaotong University,
Dalian 116028, China

Xun Yu

Department of Mechanical and Energy Engineering,
University of North Texas,
Denton, TX 76203
e-mail: xun.yu@unt.edu

Contributed by the Solar Energy Division of ASME for publication in the Journal of Solar Energy Engineering. Manuscript received April 4, 2012; final manuscript received November 19, 2012; published online January 25, 2013. Assoc. Editor: Rainer Tamme.

J. Sol. Energy Eng 135(2), 024505 (Jan 25, 2013) (5 pages) Paper No: SOL-12-1003; doi: 10.1115/1.4023181 History: Received January 04, 2012; Revised November 19, 2012

Phase change materials (PCM) have been incorporated with cementitious construction materials to store thermal energy and control interior climate in buildings, which can reduce the energy consumption and improve thermal comfort. However, addition of PCM is found to decrease strength and thermal conductivity of the cement-based composite. Carbon nanotubes (CNT) are integrated into cementitious construction materials with microencapsulated PCM to improve their thermal-conductive and mechanical performances. Results of lab and outdoor tests show the modified cement mortar containing both PCM and CNT exhibits better heat insulation properties than plain cement mortar. A temperature difference up to 6.8 °C was observed between interiors of two same size scale-down building models (one made of plain cement mortar, the other one made of cement mortar with PCM and CNT). This indicates that the modified cement mortar can effectively enhance the thermal storage property of cement-based building materials.

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Figures

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Fig. 1

Photographs of Micronal® DS 5000X [4]

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Fig. 2

SEM photographs of PCM/cement mortars with/without CNT: (a) with 5% PCM, (b) with 5% PCM and 1% CNT

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Fig. 3

Structure of building models and lab and outdoor experiment setups

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Fig. 4

Designed time-varying temperature curve to control the interior temperature of the environmental test charmer

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Fig. 5

Measured temperature time-histories and interior temperature difference of two building models in the lab test

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Fig. 6

Measured temperature time-histories and interior temperature difference of two building models in the outdoor test

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