EXERGOECONOMIC EVALUATION OF REAL PROCESSES FOR COFFEE ROASTING

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Goran D. VUČKOVIĆ Mladen M. STOJILJKOVIĆ Gordana M. VASILJEVIĆ

Abstract

Exergoeconomic methods provide an effective approach for identifying, evaluating and reducing thermodynamic inefficiencies and costs in an energy system. The aim of this paper is to show the potential for cost reduction on the demand side, using the exergoeconomic method in the example of real processes for coffee roasting. More than 6.5·109 kg of coffee beans is roasted worldwide annually, mostly in batch roasters. Near the end of the roast, roasting coffee emits volatile organic compounds, carbon monoxide and other pollutants, which in many industrialized countries have to be oxidized in afterburners. Afterburners release exhaust gases with a temperature of 250-450 °C, depending on the roasting process and the method of exhaust gas cleaning. The aim of this paper is to use exergy analysis and exergoeconomic performance evaluation to determine the energy use for coffee roasting and the afterburning process, and evaluate the way to utilize waste heat and reduce costs in the factory. For roasters with the capacity of up to 4 tons of green coffee beans per hour, the potential of heat recovery is 1.1 MW and the possibility to save money is around 60,000 € per year. This case study is similar to many others worldwide, and the results of this analysis could lead to more general conclusions.

Article Details

How to Cite
VUČKOVIĆ, Goran D.; STOJILJKOVIĆ, Mladen M.; VASILJEVIĆ, Gordana M.. EXERGOECONOMIC EVALUATION OF REAL PROCESSES FOR COFFEE ROASTING. Thermal Science, [S.l.], v. 20, p. S1271-S1283, feb. 2017. ISSN 2334-7163. Available at: <http://thermal-science.tech/journal/index.php/thsci/article/view/1649>. Date accessed: 29 june 2017. doi: https://doi.org/10.2298/TSCI16S5271V.
Section
Articles
Received 2017-02-07
Accepted 2017-02-07
Published 2017-02-07

References

[1] ****, Blog to Save Energy, https://www.ase.org/, accessed Feb., 25, 2016
[2] Fabbri, A., et al., Numerical Modeling of Heat and Mass Transfer during Coffee Roasting Process, J. of Food Eng., 105 (2011), 2, pp. 264-269
[3] Eggers, R., Pietsch, A., Roasting, in: Coffee: Recent Developments (Eds. R. J. Clark, O. G. Vitzhnem), pp. 90-107, Blackwell Science, London, 2001
[4] Severini, C., et al., Influence of Heating Rate on some Physical Physico-Chemical Properties of Coffee Beans, Proceedings, 14th Int. Sci. Colloquium on Coffee, 1992, ASIC, San Francisco, Cal., USA, pp. 641-648
[5] Schwartzberg, H., Batch Coffee Roasting; Roasting Energy Use; Reducing that Use, in: Advanced in Food Process Engineering Research and Applications, (Eds. Yanniotis, S., et al.), Food Engineering Series, Springer Science+Business Media, New York, USA, pp. 173-195, 2013
[6] Monte, D. M., et al., Waste Heat Recovery in a Coffee Roasting Plant, Applied Thermal Engineering, 23 (2003), 8, pp. 1033-1044
[7] Vučković, G., Examination of Energy Efficiency of a Complex Energy Plant by Applying the Method of Exergoeconomics (in Serbian), Ph. D. thesis, Faculty of Mechanical Engineering, Nis, Serbia, 2013
[8] Korenous, J. C., et al., Exergy Analysis of a 300 MW Lignite Thermoelectric Power Plant, Energy, 75 (2014), Oct., pp. 304-311
[9] Gungor, A., et al., Advanced Exergoeconomic Analysis of a Gas Engine Heat Pump (GEHP) for Food Drying Processes, Energy Conv. and Manage., 91 (2015), Feb., pp. 132-139
[10] Erbay, Z., Hepbasli, A., Application of Conventional and Advanced Exergy Analyses to Evaluate the Performance of a Ground-Source Heat Pump (GSHP) Dryer Used in Food Drying, Energy Conv. and Manage., 78 (2014), Feb., pp. 499-507
[11] Tsatsaronis, G., et al., Understanding the Thermodynamic Inefficiencies in Combustion Processes, Energy, 62 (2013), Dec., pp. 3-11
[12] Vučković, G., et al., Advanced Exergy Analysis and Exergoeconomic Performance Evaluation of Thermal Processes in an Existing Industrial Plant, Energy Conv. and Manage., 85 (2014), Sep., pp. 655-662
[13] Guertuerk, M., et al., Comparison of Exergoeconomic Analysis of Two Different Perlite Expansion Furnaces, Energy, 80 (2015), Feb., pp. 589-598
[14] Sayadi, S., et al., Exergoeconomic Analysis of Vehicular PEM (Proton Exchange Membrane) Fuel Cell Systems with and without Expander, Energy, 77 (2014), Dec., pp. 608-622
[15] Atmaca, A., Yurmrutaş, R., Thermodynamic and Exergoeconomic Analysis of a Cement Plant: Part I – Methodology, Energy Conv. and Manage., 79 (2014), Mar., pp. 790-798
[16] Petrakopoulou, F., et al., Conventional Exergetic and Exergoeconomic Analysis of a Power Plant with Chemical Looping Combustion for CO2 Capture, Int. J. of Thermodynamics, 13 (2010), 3, pp. 77-86
[17] Tumen Ozdil, N. F., Tantekin, A., Exergoeconomic Analysis of a FBCC Steam Power Plant, Thermal Science, on line first, DOI:10.2298/TSCI151210056T
[18] ****, Engineering Equation Solver, http://www.fchart.com/, accessed May, 25, 2015
[19] Szargut, J., et al., Exergy Analysis of Thermal, Chemical, and Metallurgical Processes, Hemisphere Publ. Corp., New York, USA, 1988
[20] Bejan, A., et al., Thermal Design & Optimization, John Wiley & Sons, Inc., New York, USA, 1996
[21] Kotas, T. J., The Exergy Method of Thermal Plant Analysis, Butterworths, London, 1985
[22] Moran, M., Shapiro, H., Fundamentals of Engineering Thermodynamics, John Wiley & Sons, Ltd., West Sussex, England, 2006