채널 간극 및 개수에 따른 판형 응축기의 열전달면적 및 압력강하 분석
Analysis of heat transfer area and pressure drop of a plate-type condenser based on channel distance and number of channels
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
최근 화석연료의 대체방안으로 유기랭킨사이클을 이용한 발전기술이 주목받고 있다. 판형 열교환기를 사용하는 것은 유기랭킨사이클의 소형화에 있어 효과적이다. 판형 열교환기의 채널 간극과 채널 개수는 열전달면적 및 압력강하에직접적인 영향을 미치는 변수이다. 압력강하는 사이클의 효율을 감소시키는 요소이므로 열역학적 사이클의 설계단계에서 정확하게 예측하는 것이 중요하다. 본 연구에서는 유기랭킨사이클용 판형 응축기에 대한 적합한 열전달 및 압력강하모델을 선정하고, 열전달 및 압력강하를 동시에 연산할 수 있는 알고리즘을 개발하였다. 개발된 알고리즘은 참고문헌의연구결과를 기준으로 검증하였다. 검증결과는 개발된 알고리즘이 충분한 신뢰성을 갖는 것으로 나타내었다. 검증을 마친알고리즘을 이용하여, Kim 등의 실험용 판형 응축기의 압력강하 개선을 위한 연구를 수행하였다. 그 결과, 채널 간극이1.6mm 이상, 채널 개수가 93개 이상에서 응축기의 입구압력 대비 3% 이내의 압력강하를 기대할 수 있었다.
Abstract
Recently, power generation technology using an organic Rankine cycle has attracted attention as an alternative method of fossil fuels. Using a plate heat exchanger is effective at miniaturizing the organic Rankine cycle. The channel distance and number of channels in the plate heat exchanger are variables that directly affect the heat transfer area and pressure drop. Accurate prediction during the design step of the thermodynamic cycle is crucial because the pressure drop is a factor that reduces the efficiency of the cycle. In this study, suitable heat transfer and pressure drop models for a plate-type condenser of an organic Rankine cycle were selected and an algorithm was developed to simultaneously calculate heat transfer and pressure drop. The developed algorithm was verified based on the results of the reference literature. Verification results indicated that the developed algorithm has sufficient reliability. Using the validated algorithm, a study was then conducted to improve the pressure drop of an experimental plate-type condenser of Kim et al. Results revealed a pressure drop of less than 3% to the inlet pressure of the condenser could be expected when the channel distance was 1.6mm or more and the number of channels was 93 or more.
참고문헌 (11)
- Y. A. Cengel, "Heat and Mass Transfer" (2014), McGraw-Hill
- W. S. Janna, "Design of Fluid Thermal Systems" (2015), CENGAGE Learning
- T. W. Lim, "Design of plate heat exchangers for use in medium temperature organic Rankine cycles", Heat Mass Transfer, 55(1), pp.165~174 (2019)
- J. S. Kim, "Experiment on radial inflow turbines and performance prediction using deep neural network for the organic Rankine cycle", Applied Thermal Engineering, 149, pp.633~643 (2019)
- Y. A. Cengel, "Thermodynamics: An Engineering Approach" (2014), McGraw-Hill
- D. Hu, "Preliminary design and off-design performance analysis of an Organic Rankine Cycle for geothermal sources", Energy Conversion and Management, 96, pp.175~187 (2015)
- "Matlab Manual" (2016), Mathworks
- J. R. García-Cascales, "Assessment of boiling and condensation heat transfer correlations in the modelling of plate heat exchangers", International Journal of Refrigeration, 30(6), pp.1029~1041 (2007)
- G. F. Hewitt, "Heat exchanger design handbook" (2008), Begell House
- Y. Y. Yan, "Condensation heat transfer and pressure drop of refrigerant R-134a in a plate heat exchanger", International Journal of Heat and Mass Transfer, 42(6), pp.993~1006 (1999)
- W. S. Kuo, "Condensation heat transfer and pressure drop of refrigerant R-410A flow in a vertical plate heat exchanger", International Journal of Heat and Mass Transfer, 48(25–26), pp.5205~5220 (2005)