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Electricity Energy Saving Assessment for Induction Motors towards Sustainable Energy Practice in Indonesian Small and Medium Industry

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Applied Mechanics and Materials
Authors:
Yusak Tanoto at Petra Christian University
Yusak Tanoto
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Abstract

This paper presents energy saving assessment on induction motors which are particularly being utilized in the small and medium industry. A walk-through motor energy audit is carried out in a typical type of industry in Indonesia to collect some important data. Strategy for annual motor energy saving is assessed involving energy efficient motor, variable speed drive, and capacitor bank. In addition, analysis is carried out to find impact on energy efficiency indicator as well as CO2 emission due to energy saving. It is revealed that the combination on selected motor saving strategy may lead to reduce electricity energy by around 10%, equal to around 38% CO2 emission mitigation. Besides, energy efficiency indicators are found to be improved. Hence environment emission is significantly reduced by applying appropriate motor energy saving for small and medium industry.
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Electricity Energy Saving Assessment for Induction Motors towards
Sustainable Energy Practice in Indonesian Small and Medium Industry
Yusak Tanoto
Electrical Engineering Department, Petra Christian University, Surabaya 60236, Indonesia
tanyusak@petra.ac.id
Keywords: Energy Efficiency Indicators, Small and Medium Industry, Environmental Emission
Reduction, Induction Motors.
Abstract. This paper presents energy saving assessment on induction motors which are particularly
being utilized in the small and medium industry. A walk-through motor energy audit is carried out in
a typical type of industry in Indonesia to collect some important data. Strategy for annual motor
energy saving is assessed involving energy efficient motor, variable speed drive, and capacitor bank.
In addition, analysis is carried out to find impact on energy efficiency indicator as well as CO
2
emission due to energy saving. It is revealed that the combination on selected motor saving strategy
may lead to reduce electricity energy by around 10%, equal to around 38% CO
2
emission mitigation.
Besides, energy efficiency indicators are found to be improved. Hence environment emission is
significantly reduced by applying appropriate motor energy saving for small and medium industry.
Introduction
As one of industrial scale, Small and Medium Industry (hereafter “SMI’s”) create a significant local
pollution and other environmental problems due to the nature of these industries with their inefficient
use of energy and other resources. Implementation of few options at little or no cost in the industrial
sector could reduce carbon dioxide emissions by 10–30% of GHG emissions, while if improved
technologies and financing mechanisms such as Clean Development Mechanism introduced by the
Kyoto Protocol are adopted, further reduction may be achieved [1]. More than half of the total
electricity energy used in industry consumed by motor driven systems [2]. Thus, industrial motors
account for a major segment of electricity energy used in industry. Several energy saving strategies
commonly available may or may not be fit with respect to several factors associated to the industry
scale and their inherent characteristics.
This paper proposes a technical approach to increase energy performance of SMI in Indonesia in
terms of specific energy consumption (SEC) and energy intensity (EI) as well as CO
2
emission
reduction by conducting induction motors energy saving assessment. Three possible strategies are
considered to reduce motor energy consumption. Energy saving potential is then analyzed with
respect to their economic payback.
Methodology
Motor energy can be saved through the usage of high energy efficient motors (EEM) as well as
utilization of technology in which controlling motor speed uses a variable speed drive (VSD) [3].
Another option is installation of capacitor bank. This paper analyses the feasibility of using EEM,
VSD, and capacitor bank for improving motor energy efficiency in the selected SMI facility.
Energy Saving Calculation. Analysis on annual energy saving (AES) by replacing standard motor
with EEM can be estimated using:
AES = HP x L x 0.746 x h x (1/E
std
– 1/E
eem
(1)) x 100.
where: AES is annual energy saving (kWh); HP is motor rated horse power; L is load factor (%); h is
operating hour; E
std
is standard motor efficiency rating (%); E
eem
is energy efficient motor efficiency
rating (%). Annual bill saving associated with the energy saving can be calculated by multiplying AES
Applied Mechanics and Materials Online: 2012-11-29
ISSN: 1662-7482, Vols. 229-231, pp 1090-1094
doi:10.4028/www.scientific.net/AMM.229-231.1090
© 2012 Trans Tech Publications Ltd, All Rights Reserved
All rights reserved. No part of contents of this paper may be reproduced or transmitted in any form or by any means without the written permission of Trans
Tech Publications Ltd, www.scientific.net. (Research Gate for subscription journals-04/03/25,06:12:23)
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