Performance Analysis of High-Efficiency Motor and Variable Speed Drive in Black Tea Processing Machinery
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Online ISSN 2234-1862 Print ISSN 1738-1266
ORIGINAL ARTICLE
Performance Analysis of High-Efficiency Motor and Variable Speed Drive in Black Tea Processing Machinery G. Abhiram 1,2
&
M. M. K. D. Manathunga 2 & K. Raveendran 3 & N. S. Withanage 2
Received: 6 August 2020 / Revised: 17 October 2020 / Accepted: 1 November 2020 # The Korean Society for Agricultural Machinery 2020
Abstract Purpose The present old standard efficiency motors (SEM) in black tea processing machinery consume large amount of electricity, thus increases the cost of production. Technologically improved high-efficiency motors (HEM) or HEM coupled with variable speed drive (VSD) could be useful to achieve high-energy efficiency. Therefore, a study was conducted with the focus to determine the feasibility of introducing HEM and VSD in withering and rolling machinery of black tea manufacturing. Methods A withering trough and two different capacity rotorvane rollers were selected for the study, and the energy consumption of different treatments was measured, and specific energy consumption, annual bill savings, simple payback period, and potential carbon dioxide emission reduction were calculated. Results The results showed that introducing HEM or HEM coupled with VSD saves the energy compared to SEM (p < 0.05). The corresponding potential annual bill savings was estimated as Sri Lankan Rupee (SLR) 13,219 to 66,096, carbon dioxide emission reduction was 467 to 2336 kg CO2 per year, and payback period was 0.06 to 0.11 years for a factory handling 8000 kg green leaves a day. Conclusions This study found that replacing existing SEM with HEM or HEM with VSD is economically viable. Keywords High-efficient motor . Rotorvane rolling . Specific energy consumption . Variable speed drive . Withering
Introduction The tea industry plays an essential role in the Sri Lankan economy as it serves as the second biggest foreign exchange earner and employment provider. The contribution of the tea industry to the country’s GDP is around 2.6% (Central Bank of Sri Lanka 2015). Concurrently, it is one of the largest electricity consumers in the country (Sri Lanka Sustainable Energy Authority 2011). Tea manufacturing is a highenergy-consuming process in which withering, rolling, and drying consume significant portion, 48.9%, 21.3%, and
* G. Abhiram
1
School of Agriculture & Environment, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand
2
Department of Export Agriculture, Faculty of Animal Science and Export Agriculture, Uva Wellassa University, Badulla, Sri Lanka
3
Process Technology Division, Tea Research Institute, Thalawakelle, Sri Lanka
7.4%, respectively (De Silva 1994). This high-energy consumption attributed to the use of high-capacity SEM and they are too old, rewound, and oversized (De Silva 1994). As a result, the total electricity consumption of the tea industry in Sri Lanka increased up to 2.45% of the country’s total production (Sri Lanka Sustainable Energy Authority 2011). This high-energy consumption of tea industry decre
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