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Moisture effects on building energy consumption in hot and humid climates in China.

Number: pap. n. 182

Author(s) : ZHU Z., QIN M. H., LEI C. R., et al.

Summary

Moisture transfer in building envelope is important not only for the characterization of behavior in connection with durability, waterproofing, degradation of appearance and thermal performance, but also for improving the building energy efficiency and indoor comfort. However, in most building energy analysis, the calculation of heat conduction through walls usually neglects the transport and storage of moisture in porous building materials and the interaction between hygro-thermal transfer and air inside the building. With the fast development of computing technology, more detailed whole-building hygro-thermal simulation becomes reality. In the paper, a detailed model for predicting moisture effects on building energy consumption and indoor comfort is presented. Non-isothermal moisture sorption and desorption processes in building envelopes are calculated. The model is applied to investigate the moisture transfer effect on indoor air humidity and building energy consumption in the Middle & Lower Yangtze Region in Southeast China, where the monthly average outdoor Relative Humidity is higher than 75%. This region is the most developed area in China (including Shanghai, Nanjing, Hangzhou etc.) and has a fast growth in energy demand in the building sector. The paper presents an analysis and comparison of heating/cooling energy consumption with and without considering the moisture transfer through the building envelope. The results show that not accounting for hygro-thermal effects in modeling will result in an overestimation of energy costs for hot and humid climates and possible over-sizing of plants, leading to inefficient operation.

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Pages: 10 p.

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Details

  • Original title: Moisture effects on building energy consumption in hot and humid climates in China.
  • Record ID : 30008766
  • Languages: English
  • Source: Clima 2013. 11th REHVA World Congress and 8th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings.
  • Publication date: 2013/06/16

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