Thermos Hydraulic Analysis On A Double Pipe Heat Exchanger With A Corrugated Tubes
Author(s):
Avvaru Sreekanth, P. Mallikarjuna
Keywords:
DPHE
Abstract
Heat Exchangers play an important role in the development of refrigeration systems. However, the effectiveness of the heat exchangers depends on the geometry, working fluids, type and arrangement of the flow through heat exchangers. Various researchers around the world are working upon the enhancement of effectiveness through the identification of various working fluids. Further, the flow pattern through the heat exchangers has been given attention to enhance the wetting area of the fluid with solid components of the heat exchanger. In addition, micro-heat exchangers developed till date employ twisted tape inserts, baffles and fins to increase the surface area of the heat exchangers still keeping the effective dimensions of the heat exchangers to be low. In the present work, a double pipe heat exchanger with corrugated pipes is proposed to enhance the thermohydraulic performance of the heat exchangers. The inner corrugated pipe carries the hot fluid and the annulus region carries the cold fluid. As the surface area of contact is increased, the heat transfer rate is expected to be increased. An investigation is done in the present work to find the pressure drop and heat transfer in the double pipe heat exchanger (DPHE) using Computational Fluid Dynamics (CFD). A commercial computational code namely ANSYS is used for the purpose of solving the general governing equations using finite volume method. Mass flow rates considered for the analysis are according to the practical conditions employed in industrial refrigeration systems. The operating temperatures of the DPHE considered in the present work are matching with the practical conditions. Various case studies were done in the present work to optimize the mass flow rate of the refrigerant through the DPHE. Further, due to the corrugations in the pipes, the rise in pressure drop expected. This pressure drop in the DPHE would contribute to the performance of the compressor in the refrigeration system thereby reducing the Coefficient of Performance (COP) of the system. Friction factors and Nusselt Numbers applicable to corrugated Double Pipe Heat Exchangers (DPHE) are investigated.
Article Details
Unique Paper ID: 144688

Publication Volume & Issue: Volume 4, Issue 2

Page(s): 126 - 135
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