Numerical Study on Energy-Saving Performance of a New Type of Phase Change Material Room

Rongda Ye, Xiaoming Fang and Zhengguo Zhang
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Rongda Ye: School of Chemistry and Chemical Engineering, ZhongKai University of Agriculture and Engineering, Guangzhou 510225, China
Xiaoming Fang: Key Laboratory of Enhanced Heat Transfer and Energy Conservation, The Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
Zhengguo Zhang: Key Laboratory of Enhanced Heat Transfer and Energy Conservation, The Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China

Energies, 2021, vol. 14, issue 13, 1-18

Abstract: The thermal performance of a phase change energy storage building envelope with the ventilated cavity was evaluated. CaCl 2 ·6H 2 O-Mg(NO 3 ) 2 ·6H 2 O/expanded graphite (EG) was employed to combined with the building for year-round management. The energy consumption caused by the building under different influence parameters was evaluated numerically. The results indicated that CaCl 2 ·6H 2 O-8wt %Mg(NO 3 ) 2 ·6H 2 O/EG should be installed on the south wall for the heating season, while CaCl 2 ·6H 2 O-2wt %Mg(NO 3 ) 2 ·6H 2 O/EG should be integrated on the roof for the cooling season. When the air layer was ventilated and the south wall was coated with the solar absorbing coating, the room could save approximately 30% of energy consumption. Moreover, the energy consumption increased with an increase in the air layer thickness, and the air layers played a different role in the building envelope. The optimal value of the flow rate between air layer 2, air layer 3, and the room was 0.09 m 3 /s. To reduce the energy consumption, the phase change materials (PCMs) with large and small thermal conductivity should be installed in the south wall and roof, respectively. In general, the phase change energy storage building envelope with the ventilated cavity can save energy during the heating and cooling seasons.

Keywords: phase change material; inorganic hydrated salt; ventilated air layer; building energy conservation; numerical simulation (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: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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