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Research on the Inter-zonal Heat Transfer Coefficient in Thermally Stratified Environment of Floor-Level Air-Supply System

  • Xinqi Yang
  • Haidong WangEmail author
  • Yuantao Xue
Conference paper
  • 265 Downloads
Part of the Environmental Science and Engineering book series (ESE)

Abstract

Stratum ventilation with air supply terminal located on the floor level near side-wall is typical for large space building, consequentially resulting in vertical thermal stratification. Heat accumulation in the upper part of unoccupied zone will have significant effect on the cooling load of occupied zone. In order to accurately predict the indoor thermal environment and load characteristics of large space building, and to calculate the heat migration occurring in the thermally stratified environment, the determination of inter-zonal heat transfer coefficient Cb is critical. This paper discusses the method to calculate inter-zonal heat transfer coefficient to represent a large space building. In a scaled laboratory, five experiment cases with different exhaust air flow ratios, heat source powers are studied. CFD simulations of the same cases are performed. The vertical temperature distribution and detailed cooling load results of the entire system and occupied zone are verified based on the experiment results. By dividing the whole space vertically into two and five zones, inter-zonal heat transfer coefficient Cb under different heat source heights is calculated from the CFD numerical simulation results. The results show that the area division method, airflow pattern, airflow state of occupied zone and the heat source affect Cb value.

Keywords

Stratum ventilation Thermal stratification CFD simulation Heat migration Inter-zonal heat transfer coefficient 

Notes

Acknowledgements

The project is supported by National Natural Science Foundation (Number 51508326).

References

  1. 1.
    Gorton, L., Sassi, M.M.: Determination of temperature profiles and loads in a thermally stratified, air-conditioned system: part II-program description and comparison of computed and measured results. Build. Eng. 88(2), 33–49 (1982)Google Scholar
  2. 2.
    Yang, D.: Numerical simulation of convective heat transfer in large space stratified air conditioning. Southwest Jiaotong University (2007)Google Scholar
  3. 3.
    Togari, S., et al.: A simplified model for predicting vertical temperature distribution in a large space. ASHRAE Trans. 99(1), 84–90 (1993)Google Scholar
  4. 4.
    Gao: Thermal space stratification theory and application research of building space. Harbin Institute of Technology (2008)Google Scholar
  5. 5.
    Lu, Y.: Practical Heating and Air Conditioning Design Manual, 2nd edn. Building Industry Press, China (2008)Google Scholar
  6. 6.
    Wang, H., et al.: On the calculation of heat migration in thermally stratified environment of large space building with sidewall nozzle air-supply. Build. Environ. 147, 221–230 (2019)CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  1. 1.School of Environment and ArchitectureUniversity of Shanghai for Science and TechnologyShanghaiChina
  2. 2.ZhongLiang Holdings GroupBeijingChina

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