TY - JOUR
TI - Entropy generation analysis for forced convection boiling in absorber tubes of linear fresnel reflector solar thermal system
AU - Thomas Sanju
AU - G Ajith Kumar
AU - Sahoo Sudhansu S
AU - Varghese Shinu M
JN - Thermal Science
PY - 2020
VL - 24
IS - 2
SP - 735
EP - 743
PT - Article
AB - A methodology has been presented related to entropy generation due to forced  convection boiling in long absorber tubes used in linear Fresnel reflector  (LFR) solar thermal system. Variable heat flux has been applied on the tube  which replicates the scenario for above-mentioned tubes and local entropy  generation has been obtained for various parameters. Mathematical modeling  has been made separately for single phase and two phase regions in flow  boiling conditions encountered in LFR tubes. Entropy generation in two phase  region has been formulated using Homogeneous Equilibrium Model (HEM). The  entropy generation at varying mass flux and heat flux cases are calculated.  The entropy generation due to heat transfer is found to be more than that of  pressure drop. Still, entropy generation due to pressure drop in two phase  region plays a major role of increasing nature of it. Present approach will  help researchers and industry to optimize the solar thermal systems where  flow related phase change occurs and measures can be taken accordingly to  increase energy efficiency of those systems.