Abstract
Today the helical coil heat exchanger is being employed widely due to its dominant advantages. In this study, a mathematical model was established to predict off-design works of the helical heat exchanger. The model was based on the LMTD and e-NTU methods, where a LMTD correction factor was taken into account to increase accuracy. An experimental apparatus was set-up to validate the model. Results showed that errors of thermal duty, outlet hot fluid temperature, outlet cold fluid temperature, shell-side pressure drop, and tube-side pressure drop were respectively ±5%, ±1%, ±1%, ±5% and ±2%. Diagrams of dimensionless operating parameters and a regression function were also presented as design-maps, a fast calculator for usage in design and operation of the exchanger. The study is expected to be a good tool to estimate off-design conditions of the single-phase helical heat exchangers.
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Recommended by Associate Editor Ji Hwan Jeong
Nguyen Minh Phu received B.E. in 2006, and M.E. in 2009 from Ho Chi Minh city University of Technology (HCMUT), Vietnam, and Ph.D. from University of Ulsan, Korea in 2012. He had been with the Arizona State University at Tempe during the summer 2014 as exchange visitor. He has been a lecturer of Mechanical Engineering Faculty in HCMUT since 2006. His research interests include the design of thermal systems and the applied renewable energy.
Nguyen Thi Minh Trinh received B.E. in 2002, and M.E. in 2009 from Ho Chi Minh city University of Technology (HCMUT), Vietnam. She is a lecturer of Mechanical Engineering Faculty in HCMUT. At the same time, she is a lecturer of Energy management and Energy audit training project, organized by Japan International Cooperation Agency (JICA) in Vietnam through the Ministry of Industry and Trade of Vietnam. Her research interests include energy efficiency and economics, heat exchanger, refrigeration and air conditioning engineering.
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Phu, N.M., Trinh, N.T.M. Modelling and experimental validation for off-design performance of the helical heat exchanger with LMTD correction taken into account. J Mech Sci Technol 30, 3357–3364 (2016). https://doi.org/10.1007/s12206-016-0645-0
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DOI: https://doi.org/10.1007/s12206-016-0645-0