Pris: 29,-

Abstrakt

In the future the implementation of low power office equipment will make thermal plumes generated by occupants one of the dominant flows affecting the air distribution in spaces. Advanced air distribution methods, such as personalized ventilation, are expected to become widely used in practice. In this study the impact of locally applied airflow on the thermal plume generated by a sitting human body was investigated.
The experiment was performed in a climate chamber ventilated with an upward piston flow. A thermal manikin simulating an occupant was sitting on a computer chair behind a table. The air speed and temperature were measured across the plume 0.7 m above the manikin head when airflow of 10 l/s was supplied first against its face and then upward from the front edge of the desk. The use of the flow, against the face or upward tangentially to the chest, disturbed significantly the free convection boundary layer enveloping the body and caused scattering in the measured values of air speed and temperature excess in the plume. In comparison with the case without airflow, the integral characteristics including volume flux, momentum flux, buoyancy force density and enthalpy flux were greater when the flow was supplied upward tangentially to the chest and lower when it was supplied against the face.

Referanser

Cermak, R. (2004) Design strategies for personalized ventilation, Ph.D. thesis, MEK-I-Ph.D.04-02, International Centre for Indoor Environment and Energy, Technical University of Denmark, Lyngby, Denmark, ISBN 87 7475 318 5

Cermak, R. and Melikov, A. (2007) Protection of occupants from exhaled infectious agents and floor material emissions in rooms with personalized and underfloor ventilation, HVAC&R Research, Volume 13, No. 1, 23-38

Kaczmarczyk, J., Melikov, A. and Fanger, P.O (2004) Human response to personalized ventilation and mixing ventilation, Indoor Air, Volume 14 (suppl.8), 17-29

Kaczmarczyk, J., Melikov, A., Bolashikov, Z., Nikolaev, L. and Fanger P.O. (2006) Human response to five designs of personalized ventilation, HVAC&R Research, Volume 12, No.2, 367-384

Melikov, A. and Kaczmarczyk, J. (2008) Impact of air movement on perceived air quality at different pollution level and temperature, Proceedings of the 11th International Conference on Indoor Air Quality and Climate – Indoor Air 2008, August 2008, Copenhagen, Denmark, Paper 1033

Schiavon, S., Melikov, A. and Sekhar, C. (2010) Energy analysis of the personalized ventilation system in hot and humid climates, Energy and Buildings, Volume 42, Issue 5, 699–707

Skwarczynski, M.A., Melikov, A.K., Kaczmarczyk, J. and Lyubenova, V. (2010) Impact of individually controlled facially applied air movement on perceived air quality at high humidity, Building and Environment, Volume 45, Issue 10, 2170-2176

Zukowska, D., Popiolek, Z. and Melikov, A. (2007a) Impact of personal factors and furniture arrangement on the thermal plume above a human body, Proceedings of the 10th International Conference on Air Distribution in Rooms – Roomvent 2007, June 2007, Helsinki, Finland, Vol. 3, p. 137-144

Zukowska, D., Melikov, A. and Popiolek, Z. (2007b) Thermal plume above a simulated sitting person with different complexity of body geometry, Proceedings of the 10th International Conference on Air Distribution in Rooms – Roomvent 2007, June 2007, Helsinki, Finland, Vol. 3, p. 191-198

Zukowska, D., Popiolek, Z. and Melikov, A. (2008) New method for calculation of integral characteristics of thermal plumes, Proceedings of the 11th International Conference on Indoor Air Quality and Climate – Indoor Air 2008, August 2008, Copenhagen, Denmark, Paper 725

Zukowska, D., Popiolek, Z. and Melikov, A. (2010a) Impact of boundary conditions on the development of the thermal plume above a sitting human body, Proceedings of the 10th REHVA World Congress “Sustainable Energy Use in Buildings” – Clima 2010, May 2010, Antalya, Turkey, Paper 1002

Zukowska, D., Popiolek, Z. and Melikov, A. (2010b) Determination of the integral characteristics of an asymmetrical thermal plume from air speed/velocity and temperature measurements, Experimental Thermal and Fluid Science, Volume 34, 1205-1216

Zukowska, D., Popiolek, Z. and Melikov, A. (2011) Impact of breathing on the thermal plume above a human body, Proceedings of the 12th International Conference on Air Distribution in Rooms – Roomvent 2011, June 2011, Trondheim, Norway (in press)





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