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Energy-saving retrofits of prefabricated house roof in severe cold area

Author

Listed:
  • Jiang, Wei
  • Zhang, Kuan
  • Ma, Lingyong
  • Liu, Bo
  • Li, Qing
  • Li, Dong
  • Qi, Hanbing
  • Liu, Yang

Abstract

The roof is the most significant in the energy consumption of building envelopes in severe cold area. The poor thermal performance of the prefabricated house roof leads to the increase in heating energy consumption and an uncomfortable indoor thermal environment. The purpose of this study is to explore the energy-saving retrofit technology of prefabricated house roof from the perspective of structure, energy-saving and economic feasibility. It is the innovation to put forward the capping form of prefabricated house roof and compare the thermoeconomy of various roof forms and thermal insulation materials. Using EnergyPlus software, the energy consumption of a typical prefabricated house with flat, slope and capping roof with insulation ceiling in severe cold area is simulated. The life cycle cost of these retrofit cases is estimated. The three-level comparisons between flat roof and slope roof, capping roofs at different angles and thermal insulation ceiling are quantitatively analyzed. The results show that the capping roof is the most energy-saving, the flat roof is the second, and the sloping roof is the worst. The capping roof 10° double slope +200 mm RW ceiling insulation is the optimal retrofit scheme, and the energy-saving rate reaches 19.38%. It significantly reduces heating energy consumption, operating costs, carbon emission, and improves the indoor temperature during the heating period and stabilizes the indoor temperature fluctuation. The roof retrofit measures of prefabricated houses have full energy-saving potential and practicability.

Suggested Citation

  • Jiang, Wei & Zhang, Kuan & Ma, Lingyong & Liu, Bo & Li, Qing & Li, Dong & Qi, Hanbing & Liu, Yang, 2022. "Energy-saving retrofits of prefabricated house roof in severe cold area," Energy, Elsevier, vol. 254(PC).
    • Handle: RePEc:eee:energy:v:254:y:2022:i:pc:s0360544222013585
    DOI: 10.1016/j.energy.2022.124455
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    References listed on IDEAS

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    Cited by:

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    2. Ke, Wei & Ji, Jie & Zhang, Chengyan & Xie, Hao & Tang, Yayun & Wang, Chuyao, 2023. "Effects of the PCM layer position on the comprehensive performance of a built-middle PV-Trombe wall system for building application in the heating season," Energy, Elsevier, vol. 267(C).
    3. Kotarela, Faidra & Kyritsis, Anastasios & Agathokleous, Rafaela & Papanikolaou, Nick, 2023. "On the exploitation of dynamic simulations for the design of buildings energy systems," Energy, Elsevier, vol. 271(C).
    4. Lei Cheng & Chunlong Zhuang & Shengbo Li & Guangqin Huang & Hongyu Zhang & Fei Gan & Ningge Xu & Shanshan Hou, 2023. "Thermal Performance Optimization Simulation Study of a Passive Solar House with a Light Steel Structure and Phase Change Walls," Energies, MDPI, vol. 16(9), pages 1-15, April.

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