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초임계 이산화탄소 브레이튼 사이클의 예비냉각기를 위한 직관형 PCHE의 열전달 특성
박주현(Joo Hyun Park),권진규(Jin Gyu Kwon),김무환(Moo Hwan Kim),차재은(Jae Eun Cha),조항진(HangJin Jo) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
A printed circuit heat exchanger (PCHE) take an attention as a new type of heat exchanger for a high pressure system. The PCHE is fabricated by the photochemical etching and diffusion bonding process. The PCHE has micro-channels with complex geometries due to photochemical etching that provide high heat transfer performance and can operate at high pressure and high temperature due to diffusion bonding. In order to attain these advantages, PCHE was considered as a heat exchanger of supercritical CO₂ (sCO₂) Brayton cycle. The sCO₂ Brayton cycle is operated at high pressure and high temperature in order to operating at supercritical region. In this study, the heat transfers of a straight PCHE for a sCO₂ cooling with water were measured experimentally. To verify effect of properties near the critical point of CO₂, experiments with different operating condition was conducted. It can be explained about better heat transfer performance near the critical point.
초임계 이산화탄소 브레이튼 사이클의 예비냉각기를 위한 지그재그 PCHE의 열전달 특성
박주현(Joo Hyun Park),김태호(Tae Ho Kim),권진규(Jin Gyu Kwon),차재은(Jae Eun Cha),김무환(Moo Hwan Kim) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Heat exchanger of supercritical CO₂ (sCO₂) Brayton cycle is operated at high pressure and high temperature in order to operating at supercritical region. To attain compactness of the whole sCO₂ system and withstand high pressure and high temperature, a printed circuit heat exchanger (PCHE) is applied to the sCO₂ Brayton cycle. The PCHE is fabricated by the photochemical etching and diffusion bonding process. The PCHE has micro-channels with complex geometries due to photochemical etching that provide high heat transfer performance and can operate at high pressure and high temperature due to diffusion bonding. In this study, the heat transfers of a zigzag PCHE for a sCO₂ cooling with water were measured experimentally.