An Experimental Measurement on Transient Thermal Response in a PI-Controlled VAV System

  • Kim, Seo-Young (Thermal/Flow Control Center, Korea Institute of Science and Technology) ;
  • Moon, Jeong-Woo (Thermal/Flow Control Center, Korea Institute of Science and Technology) ;
  • Kim, Won-Nyun (Thermal/Flow Control Center, Korea Institute of Science and Technology)
  • Published : 2003.03.01


The present study performs an experimental measurement on transient thermal response of an air-conditioned space by a variable air volume (VAV) system with a PI(pro-portional-integral) control logic. A thermal chamber with a PI controlled VAV unit is constructed to verify the previously suggested stratified multi-zone model. The effects of thermal parameters and control parameters such as supply air temperature and PI control factor are investigated by implementing the thermal chamber test. The experimental results obtained show that transient behavior of the air-conditioned space-temperature is in good accordance with the simulation results of the stratified thermal model.



  1. Kim, W. N., Kim, S. Y., Kang, B. H. and Hyun, J M., 1998, A numerical simulation on room temperature measurement method or VAV system control, Proceedings of the SAREK'99 Summer Annual Conference, pp.379-383
  2. Lu, W., Howarth, A. T., Adams, N. and Riffat, S. B., 1999, CFD modeling and measurement of aerosol particle distributions in ventilated multi-zone rooms, ASHRAE Transaction, Vol. 106, pp.116-127
  3. Zaheer-Uddin, M., 1993, Energy start-stop and fluid flow regulated control of multizone HVAC systems, Energy, Vol. 18, pp. 289-302
  4. Zhang, Z. and Nelson, R. M., 1992, Parametric analysis of a building space conditioned by a VAV system, ASHRAE Transaction, Vol. 98, pp. 43-48
  5. Moon, J. W., Kim, S. Y., Kim, W. N. and Cho, H. H., 2000, Simulation of supply aircontrol in a VAV system using a stratified lumped thermal model, Journal of SAREK, Vol. 12, pp. 632-641
  6. Mills, A. F., 1995, Basic Heat and MassTransfer, 1st ed., Richard D. Irwin, Inc., pp. 274-279