Review of Heat Pipe Heat Exchangers in HVAC and R Systems

Abstract

The domain of Waste Heat Recovery is particularly crucial for countries facing energy consumption deficiencies. Stringent environmental regulations act as a catalyst, propelling the evolution of innovative technologies and equipment. Striking a balance between economically viable, technically feasible, and environmentally sound waste heat recovery methods is imperative, extending beyond Air Conditioners to encompass various processes. Swift advancements are required to effectively recover waste heat from diverse processes. HVAC systems, like many engineering systems, generate waste heat that holds the potential for recovery and reuse in alternative applications. This study focuses on exploring noble recovery methods, utilizing hot air reclaimed from the condenser of an HVAC system, determined through mass and energy balance considerations. Numerous experimental and theoretical investigations have been undertaken on High-Performance Heat Exchangers (HPHE) since Akachi first proposed them in 1990. However, due to the intricate interplay of hydrodynamics and thermodynamics, the operational mechanism of HPHE remains highly complex and not entirely elucidated. With high expectations for HPHE applications in the HVAC and Refrigeration (R) sector, this paper undertakes a comprehensive review of its development. It systematically summarizes the latest findings from both experimental and theoretical studies, with a specific focus on the HVAC and R field. Additionally, the paper highlights promising and innovative applications of HPHE. The intention is to furnish a foundational reference for future research endeavors in this evolving field.