Advanced Mechanical and Thermal Systems: Emerging Technologies for Enhanced Energy Efficiency and Heat Management

Abstract

Advanced mechanical and thermal systems form the backbone of modern power generation, industrial processing, and thermal management technologies. This paper presents a review-based and analytical examination of recent developments in thermal power cycles, heat exchanger design, and waste-heat recovery integration aimed at improving overall energy conversion efficiency. Particular attention is given to combined and hybrid thermodynamic cycles, nanofluid-enhanced heat transfer surfaces, organic Rankine cycle (ORC) waste-heat recovery, and phase-change material (PCM) thermal storage. An analytical and review-based methodology is adopted, synthesizing published thermodynamic performance data to compare representative power cycles and heat exchanger configurations on the basis of thermal efficiency, exergy destruction, and heat transfer effectiveness. Findings indicate that combined-cycle configurations integrated with organic Rankine cycle waste-heat recovery achieve substantially higher overall thermal efficiency than conventional Rankine cycles alone, while nanofluid-enhanced microchannel heat exchangers demonstrate markedly improved effectiveness relative to conventional finned-tube designs. The paper discusses the engineering significance of these findings for power generation, automotive waste-heat recovery, and industrial thermal management, identifies limitations related to nanofluid stability and manufacturing cost, and outlines future research directions including additive-manufactured heat exchanger geometries and machine-learning-assisted thermal system optimization.

KEYWORDS: Thermal Systems, Heat Exchangers, Waste Heat Recovery, Organic Rankine Cycle, Nanofluids, Exergy Analysis, Phase-Change Materials,
Mechanical Engineering