On the Markel Equation: Novel e-NTU correlations for indirect evaporative cooler under different Lewis numbers

[+] Author and Article Information
Mohamed Khamis Mansour

Associate Professor at Department of Mechanical Engineering, Faculty of Engineering, Beirut Arab University, Beirut, LebanonDepartment of Mechanical Engineering, Faculty of Engineering, Alexandria University, Alexandria, Egypt - 1999 until 2010

1Corresponding author.

ASME doi:10.1115/1.4036204 History: Received June 01, 2016; Revised February 22, 2017


An innovative relationship between the effectiveness (e) and number of transfer (NTU) was presented in this work for indirect evaporative cooler (IEC). This relationship is featured by its simplicity in use and has non-iterative procedure to be implemented as the traditional one in the literature. The new model can be implemented in sizing and rating design of the IEC at different Lewis numbers with a reasonable accuracy. General integral equation which is similar to that of Markel equation is developed in this model. The new relationship was verified through comparison with experimental and numerical work reported in the available literature for closed or indirect cooling tower (ICT), as an example of IEC. Additionally, the predicted results of the present model were compared to those obtained from the traditional numerical model at different Lewis numbers. The simulated results from the new model show a satisfactory agreement with those obtained from the experimental work of less than 10%. The new correlations can be implemented easily in predicting the thermal design and performance of IEC in any simulation program or in real site.

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