ملخص البحث :

AbstractIn this study, experimental investigations and exergy analysis on shell and helically coiled tube heat exchanger are carried out forfree convection heat transfer. The measured data are totally optimised utilizing thermodynamics rules in which exergy study isperformed to investigate the thermal performance of the helical system under different operating conditions. The experimentalset-up of apparatus are designed and made for cold water and hot water as a working fluid of both the shell side and helical coilside, respectively. The effects of several parameters such as geometry and operational conditions on the exergy destruction anddimensionless exergy destruction are investigated. The counter flow direction is considered under the steady state flow condition,and the critical Reynolds number was more than 4000 in this study. The main objective of this work was to clarify the effect of thevolume flow rates and inlet temperatures of hot water and cold water in the shell and helical coil on exergy efficiency and pressuredrop. Results showed that the exergy destruction and dimensionless exergy destruction decrease with the increase of coil pitchand Dean number. In contrast, the exergy destruction and dimensionless exergy destruction are obviously increased with the hotwater flow rates or cold water flow rates. These exergy characteristics are also augmented with the values of hot water inlettemperatures and cold water inlet temperatures. The pressure drop is considerably increased with the increase of Dean numberand reduced with the increase of coil diameter. While, the exergy efficiency steadily increases with the decrease of the cold waterflow rates and with the increase of Dean number (2) (PDF) Exergy analysis of Shell and helical coil heat exchanger and design optimization. Available from: https://www.researchgate.net/publication/346515986_Exergy_analysis_of_Shell_and_helical_coil_heat_exchanger_and_design_optimization [accessed Mar 29 2023].