Theoretical analysis of the thermal performance of a plate heat exchanger at various chevron angles using lithium bromide solution with nanofluid

摘要

Nanofluids technology has been rapidly developing over the last two decades. In this paper, the performance of a lithium bromide (LiBr) solution with and without nanoparticles in plate heat exchanger (PHE) for various chevron angles and mass flow rates was investigated. As a result, the heat transfer rate and the overall heat transfer coefficient in 60 degrees/60 degrees PHE is over 100% higher than that of 30 degrees/30 degrees PHE, and the effectiveness of the PHE in 60 degrees/60 degrees PHE is about 70% higher than that of 30 degrees/30 degrees PHE. By using nanoparticle in the working fluid, the heat transfer performance can increase significantly. The heat transfer rate of 3 vol.% nanofluids increased about 3-8% compare to that of LiBr solution for all chevron PHEs. Besides, the 60 degrees/60 degrees PHE using 3 vol.% nanofluids produced the largest heat transfer rate and heat exchange effectiveness under given operating conditions. (C) 2014 Elsevier Ltd and IIR. All rights reserved.