This paper presents a dynamic method for detecting the actual occupancy in indoor spaces by measuring the carbon dioxide concentration of the return air and the outdoor air flow rate. The accuracy and response speed are tested and compared with the steady-state detection method. An on-line outdoor air flow control strategy using the dynamic detection method and the validation of the strategy are presented. The indoor air quality and energy performance of the demanded ventilation using this strategy, two CO2-based demanded control strategies and the strategy of constant outdoor air flow, are compared and evaluated under various occupancy and outdoor weather conditions in simu lation.
Kusuda T.: Control of Ventilation to Conserve Energy while Maintaining Acceptable Indoor Air Quality. ASHRAE Trans., V82, Pt1, ASHRAE, 1976.
2.
Ashrae: ASHRAE Standard 62-1989, Ventilation for Acceptable Indoor Air Quality, 1989.
3.
Haghighat F. , Donnini G.: IAQ and energy management by demand controlled ventilation. Environ Technol1992;13:351-359.
4.
Norell L.: Demand controlled ventilation in a school. Proc 12th AIVC Conf, AIVC, 1992.
5.
Warren BF, Harper NC: Demand controlled ventilation by room carbon dioxide concentration: A comparison of simulated energy savings in an auditorium space. Energy Building1991; 17:87-96.
6.
Barthez M., France, Soupalt O: Control of ventilation rate in building using H2O or CO 2 content. CEC Energy Savings Building Int Symp, Netherlands, 1983.
7.
Ruud SH, Fahlen P., Andersson H.: Demand controlled ventilation - full scale tests in a conference room . Proc 12th AIVC Conf, AIVC , 1992.
8.
Bearg DW: Second Generation Demand-Controlled VentilationSystem. IAQ'94, ASHRAE, 1994.
9.
Emmerich SJ, Mitchell JW, Beckman WA: Demand-controlled ventilation in a multi-zone office building. Indoor Environ1994;3:331-340.
Ashrae: ASHRAE Standard 62-1989R, Ventilation for Acceptable Indoor Quality (Public Review Draft) . ASHRAE, August, 1996.
12.
Klein SA, et al: TRNSYS: A Transient Simulation Program, Version 13.1. Madison, University of Wisconsin, 1990.
13.
Lebrun J., Ding X., Eppe JP, Wasacz: Cooling coil models to be used in transient and/or wet regimes - theoretical analysis and experimental validation. Proc System Simulation in Buildings'90, Belgium, 1990.
14.
Wang SW: Dynamic simulation of a building central chilling system and evaluation of EMCS on-line control strategies. Building Environ1997;32(2).
15.
Park C., Clark DR, Kelly GE: HVACSIM+ Building Systems and Equipment Simulation Program: Building Loads Calculation. Gaitherberg, National Institute of Standards and Technology, 1986.
16.
Skistad H.: Displacement Ventilation. Letchworth, Research Studies Press, 1994.
17.
Holmes M.: Room Air Movement with Ceiling Mounted Diffusers. BSRIA, 2/75.
18.
Schlichting H. : Boundary-Layer Theory, New York, McGraw-Hill, 1979.
