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Experimental study on unsteady air terminal

S.F. Sun, R.Y. Ding, R.Y. Zhao, W.Q. Xu, 2003
air velocity | components | cooling | diffusion
Bibliographic info: Healthy Buildings 2003 - Proceedings 7th International Conference (7th-11th December 2003) - National University of Singapore - Vol. 2, pp 465-470, 9 Fig., 1 Tab., 5 Ref.
Languages: English

This paper describes the unsteady terminal and presents its characteristics gained fromexperiment. The experimental results showed that the fan-coil unit tested in the experimentwas able to provide fluctuating airflow and the velocity curve of supply airflow wasconsistent with the control signal very well. The spectrum of supply airflow is similar to thespectrum of natural wind if the control signal simulating natural wind provided. The supplyair temperature is changed when the airflow is changed. Owing to the unsteady air supply,both the airflow rate and the cooling capacity of the unit are decreased up to 3% in the case ofdry coil. The airflow rate from the outlet was measured and the turbulence coefficient wasfound to be 0.097. The distribution of the velocities at a height 1.1 m above the floor wasmeasured. It is found that in the air velocity distribution, the area covered by the high-speedairflow was relatively small, which needs be improved.

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