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TECHNICAL PAPERS

A Model-Based Feed-Forward Controller Scheme for Accurate Chilled Water Temperature Control of Inlet Guide Vane Centrifugal Chillers

[+] Author and Article Information
Yongzhong Jia, T. Agami Reddy

Department of Mechanical Engineering and Mechanics, 3141 Chestnut St., Drexel University, Philadelphia, PA 19104

J. Sol. Energy Eng 127(1), 47-52 (Feb 07, 2005) (6 pages) doi:10.1115/1.1775225 History: Received November 04, 2003; Revised April 07, 2004; Online February 07, 2005
Copyright © 2004 by ASME
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References

Figures

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Simplified sketch of a flooded evaporator with chilled water flowing inside the tube
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Interpolated values of Tchi and Tcho in (°C) over time (interpolated to 1 s time intervals)
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Comparison of measured and model predicted values of Tcho(°C) based on 12,000 sets of data
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Control diagram of the traditional chiller feedback control strategy
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Variation of Tchi (upper plot) and Tcho (lower plot) with time under the traditional control strategy with control bands set at ±0.3°C and a control step of 0.33°C
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Variation of control accuracy with control band setting under the traditional control strategy
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Variation of Tchi (upper plot) and Tcho (lower plot) with time under the traditional control strategy with control bands set at ±0.01°C and a control step 0.33°C
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The control diagram of the proposed chiller feed-forward control strategy
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Variation of Tchi (upper plot) and Tcho (lower plot) with time under the proposed feed-forward control strategy for the control band set at ±0.3°C and a control step 0.33°C
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Variation of control accuracy with control band under proposed feed-forward control strategy
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Variation of Tchi (upper plot) and Tcho (lower plot) with time under the proposed feed-forward control strategy for the control band set at 0°C and a control step 0.33°C

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