Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : entropy generation


Numerical Study of Entropy Generation in a Vertical Square Channel Packed with Saturated Porous Media

Abdulhassan A. Karamallah; Wahid S. Mohammad; Wissam Hashim Khalil

Engineering and Technology Journal, 2011, Volume 29, Issue 9, Pages 1721-1736

Entropy generation in a vertical square channel packed with saturated porous
media, and subjected to differentially heated isothermal walls has been
numerically investigated.
The effect of Darcy, Reynolds, and Eckert numbers on Entropy generation was
studied. The entropy generation was found to be inversely proportional to both
Reynolds and Darcy number, while it was directly proportional with the Eckert
number.
It was shown that as Darcy and Reynolds numbers were increasing, the Bejan
number decreases, i.e., the irreversibility due fluid friction is dominated, while as
the Eckert increases, theirreversibility due to heat transfer increases

Performance of a Plate Fin and Tube Dehumidifying Coil Using Entropy GenerationMethod

Alaa Ruhma Kazim; Eaman Hassan Muhammed

Engineering and Technology Journal, 2009, Volume 27, Issue 16, Pages 3112-3128

The objective of the present work is to apply the concept of entropy generation method to evaluate the performance of a plate fin and tube dehumidifying coil. The present study provides an analytical method to model the working and performance of this coil as an independent part from the system without modeling the other parts that the system consisted of under wet and dry surface conditions for variable operating parameters. A comparison was made between the traditional effectiveness of the coil and the entropy generation model
to evaluate the performance of the coil for variable conditions. The study found that the entropy generation algorithm is more efficient and more sensitive to parameters change than traditional effectiveness to describe the performance of a dehumidifying coil depending on
the design and operating parameters. The combination of operating parameters of the coil such as air velocity, air wet bulb temperature, air dry bulb temperature, air relative humidity and heat load capacity affected the performance of the coil and the variable operating
parameters lead to variable performance, so the air velocity should be varied according to the state of entering air and the total space load during operation time to compensate the loss in performance and to save power consumed.