The EAHE offers promise as an approach to balance environmental considerations with indoor air quality optimization. In exploring this technology, attention is directed towards fundamental heat transfer equations, offering insights into the geometry of EAHE systems during initial design phases. Techniques such as the Enhanced Uniform Temperature (EUT) calculation method and updated correlations for Nusselt number and friction factor contribute to precise heat transfer calculations. Various configurations, including hybrid systems, are investigated, demonstrating the adaptability of EAHE in different contexts. A deeper understanding of the system's simultaneous mass and heat transfer dynamics is provided by numerical models. Experimental endeavours utilize cost-effective materials to assess the viability of EAHE in real-world scenarios, revealing its capacity to effectively cool despite resource constraints. Integrations with solar air heating ducts and water spray channels showcase the potential for enhanced heating capacities and increased energy efficiency. Economic analyses, like payback periods and net present value assessments, underscore the financial viability of hybrid arrangements. Diverse investigations delve into the optimization of tube spacing, depth, diameter, and airflow rates, emphasizing their pivotal roles in maximizing EAHE performance. The integration of EAHE with photovoltaic systems and agricultural greenhouse temperature control further expands the spectrum of potential applications. Innovative approaches involving annular phase change material and flat rectangular cross-sections contribute to the ongoing evolution of EAHE technologies, demonstrating their adaptability and efficiency in diverse settings. These findings collectively underscore the potential of EAHE as a sustainable and energy-efficient solution for indoor climate control.
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