Title: Experimental study on the effect of freezing medium temperature on exergy efficiency

Authors: Armansyah H. Tambunan; Togi E. Sihaloho; Dianta M. Kamal; Johnner P. Sitompul

Addresses: Faculty of Agricultural Technology, Department of Mechanical and Biosystem Engineering, Bogor Agricultural University, Darmaga Campus, P.O. Box 220 Bogor 16002, Indonesia ' Faculty of Agricultural Technology, Department of Mechanical and Biosystem Engineering, Bogor Agricultural University, Darmaga Campus, P.O. Box 220 Bogor 16002, Indonesia ' Faculty of Agricultural Technology, Department of Mechanical and Biosystem Engineering, Bogor Agricultural University, Darmaga Campus, P.O. Box 220 Bogor 16002, Indonesia ' Department of Chemical Engineering, Faculty of Industrial Technology, Institute of Technology Bandung, Jl. Ganesha 10, Bandung, 40132, Indonesia

Abstract: This paper evaluates the effect of variable temperatures of a freezing medium on exergy efficiency, based on experimental data. The experiments were conducted with variable temperatures at the first, second, and third stages of the freezing course. The results show that the third stage was the most reversible stage. Irreversibility of the first stage was affected by freezing temperature of both the first and second stage. The study implies that scheduling of the freezing temperature is important for reducing the total irreversibility of the process, and the temperature has to be determined consecutively from the third to the first stage.

Keywords: exergy efficiency; irreversibility; temperature scenario; coefficient of performance; multi-evaporator freezing; food products; freezing rate.

DOI: 10.1504/IJEX.2012.046813

International Journal of Exergy, 2012 Vol.10 No.3, pp.321 - 331

Received: 16 Feb 2011
Accepted: 24 Jul 2011
Published online: 10 May 2012 *

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