With the growing concerns about energy shortage and demand supply imbalance, demand side
management (DSM) activities has found its way into the mining industry. This study analyzes
the potential to save energy and energy-costs in underground mine ventilation networks, by
application of DSM techniques. Energy saving is achieved by optimally adjusting the speed
of the main fan to match the time-varying flow demand in the network, which is known as
ventilation on demand (VOD). Further cost saving is achieved by shifting load to off-peak
or standard times according to a time of use (TOU) tariff, i.e. finding the optimal mining
schedule.
The network is modelled using graph theory and Kirchhoff’s laws; which is used to form a
non-linear, constrained, optimization problem. The objective of this problem is formulated
to minimize the energy cost; and hence it is directly given as a function of the fan speed,
which is the control variable. As such, the operating point is found for every change in the
fan speed, by incorporating the fan laws and the system curve.
The problem is solved using the fmincon solver in Matlab’s optimization toolbox. The
model is analyzed for different scenarios, including varying the flow rate requirements and tariff structure. Although the results are preliminary and very case specific, the study suggests
that significant energy and energy-cost saving can be achieved in a financially viable
manner. / Dissertation (MEng)--University of Pretoria, 2014. / tm2015 / Electrical, Electronic and Computer Engineering / MEng / Unrestricted
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:up/oai:repository.up.ac.za:2263/45900 |
| Date | January 2014 |
| Creators | Chatterjee, Arnab |
| Contributors | Xia, Xiaohua |
| Publisher | University of Pretoria |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Dissertation |
| Rights | © 2015 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
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