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Study on Thermal Performance and Ventilation Strategy of Tubular Ventilation Roof

  • Jinghua YuEmail author
  • Kangxin Leng
  • Biaobiao Wang
Conference paper
  • 251 Downloads
Part of the Environmental Science and Engineering book series (ESE)

Abstract

For residential building in rural areas of China, precast concrete hollow-core slabs are widely used as building roofs. However, due to the poor thermal insulation performance and simple structure of the slab, a large amount of heat is transferred to room through the roof structure when the outdoor temperature is high, causing an increase in the indoor temperature and energy consumption of air conditioner. In order to improve the thermal performance, tubular ventilation roof is introduced by ventilating the cavity of precast concrete hollow-core slab in summer. A two-dimensional frequency-domain finite-difference model (FDFD model) and a simplified dynamic thermal network model (RC model) of the tubular ventilation roof were developed in this paper. The thermal performance under different ventilation speeds and temperature differences was evaluated. The simulation result also showed that the tubular ventilation roof had the optimum thermal performance at a ventilation speed of 4 m/s during a typical summer day in Wuhan. Compared with non-ventilated conditions, the internal surface peak temperature is reduced by 5.34 °C and the internal surface average temperature is reduced by 2.28 °C, greatly improving the thermal insulation performance of the tubular ventilation roof.

Keywords

Ventilation roof Frequency domain Simplified dynamic thermal network model Finite-difference model Ventilation strategy 

Notes

Acknowledgements

The project is supported by the National Natural Science Foundation of China (Number 51778255) and the Fundamental Research Funds for the Central Universities, HUST (Number 2018KFYYXJJ131).

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Copyright information

© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  1. 1.School of Environmental Science and EngineeringHuazhong University of Science and TechnologyWuhanChina

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