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NTIS 바로가기한국산학기술학회논문지 = Journal of the Korea Academia-Industrial cooperation Society, v.19 no.6, 2018년, pp.27 - 36
A significant amount of studies were performed on evaporation heat transfer and pressure drop in microfin tubes. Most studies, however, focused on the refrigerants used in air-conditioners or heat pumps, and very limited information is available on R-404A, which is used in low temperature refrigerat...
핵심어 | 질문 | 논문에서 추출한 답변 |
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마이크로핀관이 평활관에 비해 갖는 장점은 무엇인가? | 마이크로핀관은 가정용 에어컨이나 히트 펌프의 증발기나 응축기에 널리 사용되고 있다[1,2]. 마이크로핀관은 평활관에 비하여 압력손실 대비 전열 촉진 효과가 우수한 것으로 알려져 있다. 마이크로핀관의 증발 열전달 촉진 메카니즘으로는 전열면적의 증가, 핀에 의한 난류유발, 핀 사이에서의 핵 형성 촉진, 성층류에서 환형류로의 조기 천이 등이 있다[3]. | |
마이크로핀관은 무엇에 사용되고 있는가? | 마이크로핀관은 가정용 에어컨이나 히트 펌프의 증발기나 응축기에 널리 사용되고 있다[1,2]. 마이크로핀관은 평활관에 비하여 압력손실 대비 전열 촉진 효과가 우수한 것으로 알려져 있다. | |
평활관에서 증발 열전달계수를 측정할 때 높은 질량유속에서 건도가 증가할수록 열전달계수가 증가하나 낮은 질량유속에서 건도가 증가할수록 열전달계수가 감소하는 이유는 무엇인가? | 또한 높은 질량유속에서는(G = 200 kg/m2s) 건도가 증가할수록 열전달계수가 증가하나 낮은 질량유속에서는 (G ≤ 100 kg/m2s) 건도가 증가할수록 열전달계수가 감소한다. 이는 낮은 건도에서는 열유속이 지배적이고 건도가 높아질수록 대류 열전달의 영향이 커지는 관 내 증발 열전달의 특성 때문이다[1]. 즉, 높은 질량유속에서는 건도가 증가할수록 대류 열전달의 영향이 상대적으로 크게 나타나 증발 열전달계수가 증가하나 낮은 질량유속에서는 대류 열전달의 영향이 상대적으로 미미하여 증발 열전달계수가 감소한다. |
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