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Title: A study on the energy saving of converting a VAV System from inlet guide vane to variable fan speed control
Authors: Yee, KF
Yik, WHF
Chan, CWH
Chan, HYT
Keywords: Variable air volume system
Inlet guide-vane
Variable speed control
Fan energy use
Issue Date: 2002
Publisher: Hong Kong Institution of Engineers
Source: HKIE transactions, 2002, v. 9, no. 2, p. 18-24 How to cite?
Journal: HKIE transactions 
Abstract: The paper describes a study on the energy saving that could be achieved by converting a variable air volume (VAV) system from using Inlet guide vane to variable fan speed control, which was meant to inform the decision on whether to retrofit all the VAV systems in an office building. The study Involved retrofitting one Of the 54 VAV air-handling units (AHUs) in the building as a pilot installation. Measurement was conducted to obtain the characteristics of the system followed by a short term monitoring of the frequency of power supply to the AHU and the outdoor temperature. A simplified model was established from the measured results for predicting the fan energy use of the system. The feasible annual energy saving was estimated using the model, based on the monthly operating hours and the monthly mean outdoor temperatures determined from the records logged by the building management system. The pilot study concluded that the conversion would be viable, as the payback period would be less than four years. Fan speed control retrofit for all the VAVAHUs in the building commenced In March 1999 and was completed in June 2000. The electricity consumption Of the AHUs during the past year has been determined from metered energy use records and found to be reasonably close to the predictions of the model established in the pilot study. The procedures adopted in the pilot study may be applied in other buildings for determining whether or not to retrofit VAV systems with conventional inlet guide vane control to variable fan speed control.
ISSN: 1023-697X
EISSN: 2326-3733
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