Abstract
Fresh air age is an important index to evaluate indoor environment. The conventional method for measuring or calculating fresh air age is only suitable for simple ventilation systems and not for central ventilation systems. In this paper, an algorithm for calculating fresh air age in central ventilation system is presented, which is based on the analysis of air flow in duct and air mixing. An example is given to illustrate the algorithm. The fresh air age in every ventilated room and duct can be acquired after all rooms and duct are directly calculated in turn without iteration. The algorithm is suitable for different central ventilation systems.
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References
Zhu, N., Wang, K. H., Tian, Z., Characteristic analysis of air conditioning systems in sick buildings, HV&AC (in Chinese), 1999, 29(2): 11–15.
Ma, R. M., International development in research of indoor air quality in non-industrial buildings, HV&AC (in Chinese), 1999, 20(2): 38–41.
Li, X. T., Yang, J. R., Wang, X., Status and development of indoor air quality research, HV&AC (in Chinese), 2000, 39(3): 36–40.
Dorgan, C. E., Productivity link to the indoor environment estimated relative to ASHRAE 62-1989, in Proceedings of Health Buildings’94, Budapest, 1994, 461–472.
ASHRAE STANDARD 62-89: Ventilation for Acceptable Indoor Air Quality, 1989.
David, W. B., Indoor Air Quality and HVAC Systems, Berlin: Lewis Pub., 1993, 12–20.
CIBSE Guide: Installation and Equipment Data, London: CIBSE, 1986.
Sandberg, M., Sjoberg, M., The use of moments for assessing air quality in ventilated rooms, Building and Environment, 1983, 18(4): 181–197.
Li, X. T., Wang, X., Li, X. F. et al. Investigation on air age in a ventilated room with tracer gas technique. HV&AC (in Chinese), 2001, 31(4): 79–81.
Koskela, H. K., Rolin, I. E., Norell, L. O., Comparison between forced displacement and mixing ventilation in a garage, ASHRAE Transactions, IN-91, 18(7): 1119–1126.
Li, X. T., Wang, X., Li, X. F., Investigation on the relationship between flow pattern and air age, in Sixth International IBPSA Conference-Building Simulation ’99, Kyoto, Japan, 1999, 423–429.
Li, X. T., Jiang, Y., Calculating air age in a ventilated room with CFD method, Journal of Tsinghua University (Sci. & Tech.) (in Chinese), 1998, 38(5): 28–31.
Li, X. T., Li, X. F., Zhu, Y. X., The mathematical modeling of air age, in International Symposium on Air Conditioning in High Rise Buildings’97. Sept. 9–12, 1997, Shanghai, 241–246.
Li, X. T., Wang, X., Li, Y. Numerical method for air age calculation in ventilated room. Building Energy & Environment (in Chinese), 1999, 18(1): 2–5.
Yuan, X. X., Chen, Q. Y., Glicksman, L. R., Performance evaluation and development of design guidelines for displacement ventilation, Final Report to ASHRAE TC5.3-Room Air Distribution on ASHRAE Research Project-RP-949.
Yang Jia, Wu **angsheng, The research of the numerical simulation of the age-of-air., in Proceeding of the 4th International Conference on Indoor Air Quality, Ventilation & Energy Conservation in Buildings, Hong Kong: City University of Hong Kong, 2001, 339–345.
Awbi, H. B., Karimipanah, T., A comparison between three methods of low-level air supplies, in Proceeding of the 4th International Conference on Indoor Air Quality, Ventilation & Energy Conservation in Buildings, Hong Kong: City University of Hong Kong, 2001, 311–316.
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Li, X., Li, D. & Dou, C. An algorithm for calculating fresh air age in central ventilation system. Sci. China Ser. E-Technol. Sci. 46, 182–190 (2003). https://doi.org/10.1007/BF03039577
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DOI: https://doi.org/10.1007/BF03039577