Performance evaluation of a VAV system using air flow rate signal to control the variable-speed supply air fan

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Performance evaluation of a VAV system using air flow rate signal to control the variable-speed supply air fan

 

Author: Tung, Siu Lok Dennis
Title: Performance evaluation of a VAV system using air flow rate signal to control the variable-speed supply air fan
Degree: M.Sc.
Year: 1996
Subject: Variable air volume systems (Air conditioning)
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Pages: vi, 131 leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1219792
URI: http://theses.lib.polyu.edu.hk/handle/200/4952
Abstract: A field experimental study on the performance of a VAV system having a variable speed drive for fan motor under reduced static pressure control has been carried out in two adjacent floors of an office building. Field retrofit for the VAV air conditioning system from constant static pressure control to reduced static pressure control was performed. Direct-digital-control VAV boxes and network communication technology were applied in the project. The supply fan speed was adjusted to its lowest possible level using summation of air flow passing through each VAV box as the control signal. Experimental tests were carried out to evaluate the operational performance and fan energy saving of the VAV system under reduced static pressure control algorithms as compared to the traditional constant static pressure control. The experimental results confirmed that additional fan energy saving can be achieved if duct static pressure is allowed to be further lowered as compared to constant static pressure control algorithms. The results also indicated that greater saving in fan energy consumption is achieved when a VAV system is operated in lighter load condition under reduced static pressure control algorithms. Simple payback calculation using the results from this project suggested that adopting the reduced static pressure control in VAV air conditioning systems will make the total life cycle cost much lower. The results are expected to find wide application for local air conditioned buildings.

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