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International Heat Transfer Conference 15

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Maximal Velocity Ratio Design Method for Shell-and-Tube Heat Exchangers with Continuous Helical Baffles

Jian-Feng Yang
Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China

Min Zeng
Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China

Gui-Dong Chen
MOE Key Laboratory of Thermo-Fluid Science and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China

Qiu-Wang Wang
Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, P.R. China

DOI: 10.1615/IHTC15.hex.009093
pages 3699-3714


KEY WORDS: shell-and-tube heat exchanger, continuous helical baffles, maximal velocity ratio, design method

Abstract

In industries, the tube bundle and baffle arrangements of shell-and-tube heat exchangers sometime need to be redesigned or replaced of failure or improvement in their heat transfer efficiency. “Shell-and-tube heat exchangers with continuous helical baffles (CH-STHXs)” is one of the new technologies to improve the performance of common shell-and-tube heat exchangers with segmental baffles (SG-STHXs). In present paper, an approach named maximal velocity ratio design method for shell-and-tube heat exchangers with continuous helical baffles (CH-STHXs) has been developed based on the widely used Bell-Delaware method for shell-and-tube heat exchangers with segmental baffles (SG-STHXs). The data of heat transfer coefficient on the shell side for different mass flow rate obtained from the experiments and simulations including different helix angle and working fluid are used to fit correlation between Nusselt number and Reynolds number. Then both a curve and its mathematical expression which relate the maximal velocity ratio to the heat transfer coefficient on the shell side are developed. There are two core steps in this method: first, design a SG-STHX by Bell-Delaware method which could meet the requirements of heat loads and allowable pressure drop; second, design a CH-STHX by the above curve and its mathematical expression. Then the detailed procedures of the method are depicted in the present paper. Finally, three cases are provided to validate the proposed method.

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