Gas Exhaust Heat Exchanger CFD Study of Heat Recovery in a Gas-Fired Power Plant

Abstract

The availability of affordable, reliable energy sources is crucial to a thriving economy. However, the current energy sources are
being used up at an alarming pace. Therefore, new methods of energy conservation must be implemented. This is an effort to market a
ceramic heat exchanger with novel cross sections.Inadequate mass distribution, thermal stresses due to inhomogeneous heating and cooling,
etc. are only some of the many process intensification challenges that early heat exchangers helped pave the way for. Ceramic materials have
been presented as a replacement for traditional materials as a means of overcoming the aforementioned challenges. Given that ceramic
materials are advantageous in many ways, including their resistance to corrosion and high temperature. Ceramic heat exchangers' specially
designed surfaces ensure that incoming fluxes are distributed uniformly.
Computational fluid dynamics (CFD) was used to model a variety of ceramic heat exchanger tube configurations for this study.The physical
model of the complex, multi-shaped construction was brought into Fluent 18.2. To measure how efficient and effective heat transmission is,
engineers developed the ceramic monolith heat exchanger. The whole domain, including the fluid area on the exhaust gas side, the ceramic
core, and the fluid region on the air side, was computed numerically. Different duct cross sections (rectangular, elliptical, and cylindrical)
with air and exhaust flowing in opposite directions were used to calculate the total system. When the predicted heat transfer rate is compared
between theoretical calculation and numerical computing, the latter is shown to be 15% higher.