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Wall-Attached Night Ventilation Combined with Phase Change Material Wallboard in Hot Summer: An Experimental Study on the Thermal Performance

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Abstract

Night ventilation is regarded as a promising cooling strategy by storing night cooling in the thermal mass of the building. However, night ventilation performance in hot summer is restricted by the climatic limits. In this paper, we propose a new solution as the integration of wall-attached night ventilation (WANV) and phase change material wallboard (PCMW). The principle of the proposed system is to utilize the wall-attached jet ventilation to achieve forced convection and to adopt latent energy storage of PCMW to enlarge the energy storage density capabilities, and the coupling method is expected to improve the night ventilation performance. Comparative experiments were conducted to evaluate the thermal performance of the hybrid system by evaluating indoor temperature history, thermal comfort time and cooling efficiency. Due to the high thermal energy storage density capability of PCMW, it was found that the presence of PCMW has a negative influence on night cooling efficiency but still has a positive influence on the overall cooling effect. The proposed WANV combined with the PCMW system significantly increased the temperature decrease of room air and west wall inside surface during one hour’s night ventilation by 94.97% and 67.74%, respectively, and reached an extension of 38.42% of indoor thermal comfort time. The results highlight the potential of WANV integration of PCMW to improve the thermal performance of night ventilation.

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Abbreviations

c :

specific heat/kJ·°C−1

d :

thickness/m

T :

temperature/°C

\({\bar T_{{\rm{surface}}}}\) :

average wall structure temperature/°C

λ :

thermal conductivity/W·(m·°C)−1

ε :

emissivity

η :

night cooling efficiency

ρ :

density/kg·m−3

in:

inside surface

inlet:

inlet air

outlet:

outlet air

out:

outside surface

room:

room air

west:

west wall

BW:

brick wall

CCP:

climatic cooling potential

PCM:

phase change materials

PCMW:

phase change material wallboard

RH:

relative humidity

WANV:

wall-mounted attached night ventilation

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Acknowledgements

The authors wish to thank the financial support of the National Key Research and Development Program of China (Grant No. 2018YFC0705306), National Natural Science Foundation of China (No. 52108096), Fundamental Research Funds for the Central Universities (No. 2682020CX28), and project from Key Lab. of Marine Power Engineering and Tech. authorized by MOT (No. KLMPET2020-04).

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Authors and Affiliations

  1. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu, 610031, China

    Wenhui Ji, Yanping Yuan, Yajun Li & Min Yu

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  1. Wenhui Ji
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  2. Yanping Yuan
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  4. Min Yu
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Correspondence to Yanping Yuan.

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Ji, W., Yuan, Y., Li, Y. et al. Wall-Attached Night Ventilation Combined with Phase Change Material Wallboard in Hot Summer: An Experimental Study on the Thermal Performance. J. Therm. Sci. 31, 318–331 (2022). https://doi.org/10.1007/s11630-022-1577-x

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  • DOI: https://doi.org/10.1007/s11630-022-1577-x

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