라멜라 열교환기 내에 딤플 배열이 열전달 특성에 미치는 영향

초록

High-temperature waste heat can cause complex issues, such as environmental pollution and energy loss. This study aimed to address these issues by designing a lamellar recuperator, a waste heat recovery device that can recycle energy and reduce thermal loads. Performance was evaluated by varying the dimple arrangement and mass flow rate, using two indicators: heat exchanger efficiency and pressure drop between the inlet and outlet. The results showed that, for a given dimple arrangement, heat exchanger efficiency decreased with an increased air mass flow rate, while the pressure drop between the air inlet and outlet increased, and the pressure drop between the gas inlet and outlet decreased. Additionally, an increased mass flow rate of flue gas improved the heat exchanger efficiency and increased both the air and gas pressure drops. Therefore, when designing the lamellar recuperator, it is important to consider the variations in efficiency and pressure drop resulting from changes in mass flow rate and dimple arrangement.

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