DOI: https://doi.org/10.36719/2663-4619/127/277-284
Shukur Nasirov 
Azerbaijan State Oil and Industry University
Baku, Azerbaijan
Doctor of Technical Sciences
https://orcid.org/0000-0001-6421-7549
shukur.nasirov@asoiu.edu.az
Senan Neymatov
Azerbaijan State Oil and Industry University
Baku, Azerbaijan
nemetovsenan89@gmail.com
Nicat Verdiyev
Azerbaijan State Oil and Industry University
Baku, Azerbaijan
PhD student
nicat.verdiyev.2020@gmail.com
Thermal Performance of Heat Exchangers Supplied by Solar Collector Heated Water in Hybrid Solar Energy Systems
Abstract
This research presents a comprehensive simulation-based evaluation of heat exchanger performance in a hybrid solar energy system integrating photovoltaic modules and solar thermal collectors. The proposed configuration employs solar collector preheated water to increase the inlet temperature of a counter-flow heat exchanger, thereby intensifying the thermal driving force between hot and cold streams. A steady-state numerical model incorporating energy balance equations, Reynolds number analysis, and convective heat transfer correlations was developed to quantify system behavior. Parametric simulations were performed for collector outlet temperatures ranging from 50 °C to 90 °C and mass flow rates between 0.1 and 0.3 kg/s. The results demonstrate that solar preheating increases the heat transfer rate by up to 45%, enhances the overall heat transfer coefficient by approximately 30%, and improves thermal efficiency by 25–35% compared to conventional systems without solar assistance. The findings confirm that solar-assisted heat exchange significantly strengthens thermal performance and provides a practical pathway for sustainable energy integration.
Keywords: Hybrid solar energy system, solar thermal collector, heat exchanger analysis, temperature difference, thermal efficiency