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
Appears in Collections:	Bài báo của ĐHQGHN trong Web of Science