G. Prakash Narayana, Karan H. Mistrya, Mostafa H. Sharqawya, Syed M. Zubairb, John H. Lienhard Va,†
Frontiers in Heat and Mass Transfer, Vol.1, No.2, pp. 1-13, 2010, DOI:10.5098/hmt.v1.2.3001
Abstract Simultaneous heat and mass exchange devices such as cooling towers, humidifiers and dehumidifiers are widely used in the power generation,
desalination, air conditioning, and refrigeration industries. For design and rating of these components it is useful to define their performance by an
effectiveness. In this paper, several different effectiveness definitions that have been used in literature are critically reviewed and an energy based
effectiveness which can be applied to all types of heat and mass exchangers is defined. The validity and the limitations of the various effectiveness
definitions are demonstrated by way of several examples including direct and indirect contact,… More >
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