Abstract
In a typical house with a mechanical ventilation system, a ventilation duct with a certain installation length is placed along the exterior walls or in the ceiling shed space. To effectively use this ventilation duct, we aimed to develop a novel ventilation duct system with sensible heat exchange and passive air purification mechanisms. The proposed ventilation duct comprises multiple layers of a counterflow heat recovery ventilator (HRV). Baffles were installed in the middle of the flow channel to collect particles in the outdoor air by forming a circulating flow associated with the separation flow and gravitational settling in a local domain in the flow channel. To optimize the design of this new ventilation duct concept in terms of particle removal and heat exchange efficiencies, we conducted a computational fluid and particle dynamics analysis as a function of design parameters such as airflow rate, particle size, and air temperature. Through a series of numerical analyses, differences in the heat exchange efficiency and effectiveness of particle removal corresponding to different baffle designs were quantitatively evaluated, and finally, the optimal design for the air channel as an HRV was determined.
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