Modelling and experimental validation for off-design performance of the helical heat exchanger with LMTD correction taken into account

http://repository.vnu.edu.vn/handle/VNU_123/27338



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.

Title: 


Modelling and experimental validation for off-design performance of the helical heat exchanger with LMTD correction taken into account
Authors: Nguyen, Minh Phu
Nguyen, Thi Minh Trinh
Keywords: Effectiveness-NTU
Pressure drop
Off-design
Helical heat exchanger
Experimental validation
Issue Date: 2016
Publisher: H. : ĐHQGHN
Citation: ISIKNOWLEDGE
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.
Description: JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Volume: 30 Issue: 7 Pages: 3357-3364 ; TNS06420
URI: http://repository.vnu.edu.vn/handle/VNU_123/27338
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