Numerical Investigation on Energy Efficiency of a Serial Pipe-Embedded Window System Operated in Summer Considering Water Temperature Change in Pipeline

  • Sihang Jiang
  • Xianting LiEmail author
Conference paper
Part of the Environmental Science and Engineering book series (ESE)


Pipe-embedded window with low-grade energy can significantly reduce the cooling load of buildings. However, previous studies are generally based on the same water temperature for all the pipes, which is equivalent to parallel pipe-embedded window (PPW) and results in a very small temperature difference between inlet and outlet of pipes. A numerical model of serial pipe-embedded window (SPW) is developed, and the load reduction potential and performance of the SPW considering water distribution are studied in this paper. The results show that: (1) the SPW still has a satisfactory load reduction effect which is slightly less than that with the PPW; (2) the COP of the SPW system is far higher than that of the PPW system after considering water distribution; (3) the water temperature affects the indoor load more than the outdoor air temperature, and natural sources with temperature below 38 °C can be utilized effectively by a SPW for energy saving.


Natural energy Pipe-embedded window Numerical simulation Building energy efficiency Space cooling 



The project is supported by the China National Key R&D Program (No. 2016YFC0700302) and the China National Natural Science Foundation (Nos. 51578306 and 51638010).


  1. 1.
    Chow, T.T., Li, C., Lin, Z.: Thermal characteristics of water-flow double-pane window. Int. J. Therm. Sci. 50(2), 140–148 (2011)CrossRefGoogle Scholar
  2. 2.
    Chow, W.K., Hung, W.Y.: Effect of cavity depth on smoke spreading of double-skin façade. Build. Environ. 41(7), 970–979 (2006)CrossRefGoogle Scholar
  3. 3.
    Gratia, E., De, H.A.: Greenhouse effect in double-skin façade. Energy Build. 39(2), 199–211 (2007)CrossRefGoogle Scholar
  4. 4.
    Gray, D.D., Giorgini, A.: The validity of the Boussinesq approximation for liquids and gases. Int. J. Heat Mass Transfer 19(5), 545–551 (1976)CrossRefGoogle Scholar
  5. 5.
    Iyi, D., Hasan, R., Penlington, R., Underwood, C.: Double skin façade: Modelling technique and influence of venetian blinds on the airflow and heat transfer. Appl. Therm. Eng. 71(1), 219–229 (2014)CrossRefGoogle Scholar
  6. 6.
    Manz, H.: Total solar energy transmittance of glass double façades with free convection. Energy Build. 36(2), 127–136 (2004)CrossRefGoogle Scholar
  7. 7.
    Ministry of Housing and Urban-Rural Development: Technical Code for Ground-Source Heat Pump System (GB50366–2005). Beijing, China (2009)Google Scholar
  8. 8.
    Saelens, D., Roels, S., Hens, H.: The inlet temperature as a boundary condition for multiple-skin façade modelling. Energy Build. 36(8), 825–835 (2004)CrossRefGoogle Scholar
  9. 9.
    Shen, C., Li, X.: Solar heat gain reduction of double glazing window with cooling pipes embedded in venetian blinds by utilizing natural cooling. Energy Build. 112, 173–183 (2016)CrossRefGoogle Scholar
  10. 10.
    Shen, C., Li, X., Yan, S.: Numerical study on energy efficiency and economy of a pipe-embedded glass envelope directly utilizing ground-source water for heating in diverse climates. Energy Convers. Manag. 150, 878–889 (2017)CrossRefGoogle Scholar
  11. 11.
    Sierra, P., Hernández, J.A.: Solar heat gain coefficient of water flow glazings. Energy Build. 139, 133–145 (2017)CrossRefGoogle Scholar
  12. 12.
    Zeng, Z., Li, X., Li, C., Zhu, Y.: Modeling ventilation in naturally ventilated double-skin façade with a venetian blind. Build. Environ. 57, 1–6 (2012)CrossRefGoogle Scholar

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© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  1. 1.Department of Building Science, School of ArchitectureTsinghua UniversityBeijingChina

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