라멜라 열교환기에서 채널 유로 폭과 채널 간격이 열전달 특성에 미치는 영향

초록

To effectively utilize waste heat generated in steel industry processes, this study analyzed the efficiency and pressure-enhancing characteristics of a lamellar heat exchanger capable of recovering approximately 20 kW of heat from high-temperature gas (600°C or higher) as part of an effort to efficiently recover heat for use in low-temperature processes. The results confirmed that heat transfer efficiency decreased as the air Reynolds number increased. While the pressure drop between the air inlet and outlet increased, the pressure drop between the high-temperature gas inlet and outlet decreased. It was confirmed that as the Reynolds number of the high-temperature gas increased, the heat exchange efficiency increased; the pressure drop between the inlet and outlet of the air increased, and the pressure drop between the inlet and outlet of the high-temperature gas also increased. In this case, it was found that as the channel width decreased, the spacing between channels increased, slowing the flow velocity of the high-temperature gas and increasing the residence time, which in turn increased the heat exchange rate and ultimately improved heat exchange efficiency; however, the pressure drop on the air side also increased. Conversely, it was found that as the spacing.

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