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Operating strategies for economizer control in an air conditioning system


Operating strategies for economizer control in an air conditioning system

Zhao, Feng (1998) Operating strategies for economizer control in an air conditioning system. Masters thesis, Concordia University.



A typical economizer in an air conditioning system is investigated in this paper. New operating strategies of the economizer are proposed. An economizer consists of three coupled dampers--an outdoor air, a recirculation, and a discharge damper--controlled so that the amount of outdoor air may be varied from a minimum to 100% of the supply air. Traditionally the three dampers are coupled. In a new strategy only the outdoor and recirculation dampers are coupled and the discharge damper is always fully open during operation. An additional strategy involves linearizing the damper area as a function of the control signal by means of a software algorithm. Fan energy requirements for the new strategies are compared to those for the traditional strategy. The amount of fresh air may be controlled by heating and cooling considerations or by indoor air quality considerations. Carbon dioxide (CO$\sb2$) concentration is an indication of indoor air quality. The objectives of the investigation were to determine the best strategy to minimize fan energy consumption, and to control ventilation by demand as indicated by room CO$\sb2$ concentration. (Abstract shortened by UMI.)

Divisions:Concordia University > Faculty of Engineering and Computer Science > Mechanical and Industrial Engineering
Item Type:Thesis (Masters)
Authors:Zhao, Feng
Pagination:xiii, 116 leaves : ill. ; 29 cm.
Institution:Concordia University
Degree Name:Theses (M.A.Sc.)
Program:Mechanical and Industrial Engineering
Thesis Supervisor(s):Krakow, K. I
ID Code:682
Deposited By: Concordia University Libraries
Deposited On:27 Aug 2009 17:13
Last Modified:08 Dec 2010 15:16
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