Document Type : Technical Note


Department of Mechanical Engineering, School of Mechanical and Industrial Engineering, Institute of Technology, University of Gondar, Gondar, Ethiopia


The main aim of this study is to use waste heat for cooling effect production from cement rotary kiln shell by applying vapor absorption refrigeration system. The plant has performance to manufacture 2000 tons of clinker per day. Energy and exergy analysis has been performed to assess first and second law efficiencies and rotary kiln is used as a control volume on dry type cement plant. Result shows that about 4.3MW energy is lost from kiln shell. From the analysis, 31.13% total exergy is wasted to the surrounding in case of pre-calcining and pre-heating of raw material. The overall result for exergy analysis of kiln indicates 59.46% of irreversibility and also the first and the second law efficiency of the rotary kiln is 53.39% and 40.54%, respectively. By using convective mode of heat transfer about 11% of energy is extracted by the generator for production of cooling effect which is wasted from kiln shell. About 300kW cooling effect is produced in the evaporator by applying absorption cycle with system performance 0.67 and exergetic efficiency 87%. From heat recovery there is direct savings by reducing fuel consumption and indirect savings by decreasing environmental impact. Hence, use of waste heat results in reduction of thermal pollution and energy consumption in auxiliary equipment.


1. Parmar, M., Solanki, D. and Vegada, B., 2016. Energy and Exergy analysis of cement rotary kiln. International Journal of Advanced Engineering and Research Development. 3(4): 284–293.
2. Kol, S. and Chaube, A., 2013. Exergy analysis of Birla cement plant Satna: A case study. International Journal of Scientific & Engineering Research, 4(10): 312–320.
3. Jijesh V P, Shifin Yohannan, Jithin K Jose, Rahul C R, Jeshin Joy P, L. A. J., 2015. Energy and Exergy Analysis in a Cement Plant, International Journal of Science, Engineering and Technology Research. 4(4): 677– 679.
4. Peray, K. E., 1979. Cement manufacturer’s handbook. Chemical Pub. Co., United states.
5. Patil, R.K., Khond, M.P. and Navale, L. G., 2013. Thermal Energy Assessment of Indian Cement Plant Specially Relates to Rotary Kiln. Journal of Mechanical and Civil Engineering, 23–31.
6. Engin, T. and Ari, V., 2005. Energy auditing and recovery for dry type cement rotary kiln systems––A case study. Energy Conversion and Management. 46(4): 551–562.
7. Moran, M.J., Shapiro, H.N., Boettner, D.D. and Bailey, M. B., 2010. Fundamentals of engineering thermodynamics. John Wiley & Sons.
8. Rahim, N.A., Islam, M.R. and Hossian, M. S., 2012. An exergy analysis for cement industries: an overview. Renewable and Sustainable Energy Reviews. 16(1): 921–932.
9. Koroneos, C., Roumbas, G. and Moussiopoulos, N., 2005. Exergy analysis of cement production. International Journal of Exergy, 2(1): 55– 68.
10. Gürtürk, M. and Oztop, H. F., 2014. Energy and exergy analysis of a rotary kiln used for plaster production. Applied Thermal Engineering. 67(1–2): 554–565.
11. Kotas, T. J., 2013. The exergy method of thermal plant analysis, Elsevier.
12. Atmaca, A. and Yumrutaş, R., 2014. Analysis of the parameters affecting energy consumption of a rotary kiln in cement industry. Applied Thermal Engineering. 66(1–2): 435–444.
13. Karellas, S., Leontaritis, A.D., Panousis, G., Bellos, E. and Kakaras, E., 2013. Energetic and exergetic analysis of waste heat recovery systems in the cement industry. Energy. 58: 147–156.