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Perceived control of stratum ventilation.

Author(s) : LIN Z., CHOW T. T., TSANG C. F.

Summary

Current control strategies for central air conditioning typically adopt a machine-centred, energy-consuming approach that focuses on creating constant, uniform neutrality-conditions which might actually be perceived by some occupants as thermal monotony or sensory deprivation. There are needs for more sophisticated and responsive environmental control strategies, enhanced levels of thermal comfort and acceptability among occupants. Stratum ventilation, a new ventilation mode proposed recently by the authors, has the potential to strike a balance between fully automated controls at the system side and manual controls that the users are able to alter. Stratum ventilation should be integrated with specific control strategies for various applications and varieties of control option available to occupants. A working example using CFD simulations is given to illustrate the performance of the proposed new system. Fresher air is directly introduced to breathing zone hence air age of the air layer should be younger. Air temperature gradient is low in the occupied zone. Because less fresh air bypasses occupants, fresh airflow rate may be reduced. The air supply temperature is usually high for stratum ventilation. The evaporating temperature of the refrigerating plant can also be lifted, which results in higher COP.

Details

  • Original title: Perceived control of stratum ventilation.
  • Record ID : 2008-2644
  • Languages: English
  • Source: Clima 2007. WellBeing Indoors. Proceedings of the 9th REHVA World Congress [CD-ROM + Abstract book].
  • Publication date: 2007/06/10

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