Review on the Performance Evaluation of Thermal Exchangers using Different Baffle Designs

Ajeet Kumar Mishra ,Prof Shamir Daniel ,Prof Amit Kumar Asthana

doi:10.24113/ijoscience.v7i12.437

Abstract

The thermal performance of a heat exchanger depends upon various parameters like inlet temperature of hot fluid, type of hot fluid, type of cold fluid, the shape of baffles, the material of baffles, baffles angle, and property of ribs. Basically fluid flow and heat transfer characteristics largely depend upon the Reynolds number (Re). Reynolds number is basically the ratio of inertia force to viscous force. Re is only the factor by which we can decide whether the fluid is laminar or turbulent in shell and tube type of heat exchanger. The heat exchanger is an adiabatic device in which heat is transferred from one fluid to another fluid across a plate surface. In this paper, we have introduced some special types of triangular baffles with rectangular channels. The purpose of this apparatus is to enhance the performance of the heat exchanger. Heat exchangers, nowadays, are one of the most important heat & mass transfer apparatuses in industries like oil refining; heat treatment plants, electric power generation, etc. are long service life.

Highlights

The diagram shown above are of (a) Shell and tube heat exchangers with segmented baffles (STHX-SG), (b) shell and tube heat exchangers with continuous helical baffles (STHX CH) and (c) the shell and tube heat exchangers with staggered baffles (STHX-ST).The shell and tube heat exchanger (STHX) is one of the most widely used heat exchangers owing to its versatile usability, convenient maintenance, high-pressure resistance, and high-temperature resistance
Applications of the inclined baffles may be in the large land based modern gas turbines, in which it has become a growing trend to increase the temperature of the combustion product to increase the specific thrust and to reduce the specific fuel consumption
Liquid additives usually depress the surface tension of liquids for boiling system. It has been found through the review that some special types of baffles with channels can be used for enhancing the thermal performance of heat exchanger

Summary

INTRODUCTION

The diagram shown above are of (a) Shell and tube heat exchangers with segmented baffles (STHX-SG), (b) shell and tube heat exchangers with continuous helical baffles (STHX CH) and (c) the shell and tube heat exchangers with staggered baffles (STHX-ST).The shell and tube heat exchanger (STHX) is one of the most widely used heat exchangers owing to its versatile usability, convenient maintenance, high-pressure resistance, and high-temperature resistance. Repeated ribs or turbulators have been used as the promoters of turbulence to enhance the heat transfer to the flow of coolants in a channel. In spite of turbine blade internal cooling has been widely considered in the past studies, there are other applications such as heat exchangers, electronic equipment and nuclear reactors and may use the results of enhanced internal cooling in channels with one, two or four rib-roughened walls. Ribs, and other heat transfer enhancement techniques, insertion of baffles in heat transfer devices is popular to promote better mixing of the coolant and increase cooling performance [2]. Applications of the inclined baffles may be in the large land based modern gas turbines, in which it has become a growing trend to increase the temperature of the combustion product to increase the specific thrust and to reduce the specific fuel consumption. Shell and tube heat exchangers (STHX) have piqued the investigators' interest because they are used during 35–40% of chemical reaction industries throughout the world[3]

LITERATURE REVIEW

CONCLUSION