Performance evaluation of a triple-effect evaporator with forward feed using exergy analysis

Balkan F. , COLAK N. , HEPBASLI A.

INTERNATIONAL JOURNAL OF ENERGY RESEARCH, vol.29, no.5, pp.455-470, 2005 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 29 Issue: 5
  • Publication Date: 2005
  • Doi Number: 10.1002/er.1074
  • Page Numbers: pp.455-470
  • Keywords: evaporator, exergy analysis, exergy efficiency, orange juice concentrate, performance evaluation, triple-effect evaporator, ENERGY


The present study evaluates the performance of a triple-effect evaporator with forward feed (TEEFF) system by using exergy analysis based on actual operational data. The orange juice with a capacity of about 1.222 kgs(-1) is concentrated from a dry matter (DM) content of 12 to 65% in this TEEFF, which is situated in an orange juice concentrate line installed in a factory, located in Denizli, Turkey. A Visual Basic 6.0 program was also developed to show how the exergetic performance characteristics of the system vary with the feed flow rates ranging from 1.222 to 1.667 kg s(-1). The total exergy efficiency of the TEEEFF is found to be on average 0.85. The largest exergy destruction occurs in the first-effect of the TEEFF system with 48.2% of total, followed by the third and second effects with 32.04 and 19.76% of that. Evaporator performance is also rated on the basis of steam economy, which is obtained to be in the range of 2.05-2.14 under the operation conditions. It is expected that the analysis presented here should provide a designer with a better, quantitative grasp of the inefficiencies and their relative magnitudes in the design, simulation and operation of multiple-effect evaporators. Copyright (c) 2005 John Wiley & Sons, Ltd.