Heat recovery optimization of a shell and tube bundle heat exchanger with continuous helical baffles for air ventilation systems

Bari MA, Münsch M, Schöneberger B, Schlagbauer B, Tiu AA, Wierschem A (2024)

Publication Type: Journal article

Publication year: 2024

Journal

International Journal of Air-Conditioning and Refrigeration World Scientific

Book Volume: 32

Article Number: 2

Journal Issue: 1

DOI: 10.1007/s44189-023-00046-4

Abstract

We report a numerical evaluation of the impact of continuous helical baffle on the heat recovery efficiency of counterflow tube bundle heat exchangers. The baffle inclination angle has been varied from 11 ∘ to 22 ∘ . Since the fluid flows over the tube bundle at an angle due to helical flow inside the shell, the heat exchanger operates in cross counter mode. Fluent simulations with the k- ω transition shear stress transport turbulence model have been performed to investigate the thermal-hydraulic parameters of the system in terms of heat recovery efficiency, pressure loss, and overall heat transfer rate. Outside air temperature has been varied to mimic cold and warm weather. Pressure loss has been constrained to be less than 250 Pa, conforming to EU guidelines for energy labeling of residential ventilation units. At the maximum volume flow rate of 40 m 3 /h, the device performed with over 80 % heat recovery efficiency for the considered temperature difference. Continuous helical baffles helped to improve convective heat transfer by reducing cross flow area and increasing velocity. Smaller angles result in greater pressure loss while having no discernible effect on heat recovery efficiency for the considered geometry. The analysis demonstrates the potential of a compact counterflowing recuperative heat exchanger with continuous helical baffles for decentralized ventilation systems and serves as a basis for further optimization.

Authors with CRIS profile

Md Ashfaqul Bari Professur für Hochdruckthermofluiddynamik und Rheologie Manuel Münsch Lehrstuhl für Strömungsmechanik (LSTM) Bastian Schöneberger Lehrstuhl für Strömungsmechanik (LSTM) Bernhard Schlagbauer Lehrstuhl für Strömungsmechanik (LSTM) Andreas Wierschem Professur für Hochdruckthermofluiddynamik und Rheologie

How to cite

APA:

Bari, M.A., Münsch, M., Schöneberger, B., Schlagbauer, B., Tiu, A.A., & Wierschem, A. (2024). Heat recovery optimization of a shell and tube bundle heat exchanger with continuous helical baffles for air ventilation systems. International Journal of Air-Conditioning and Refrigeration, 32(1). https://doi.org/10.1007/s44189-023-00046-4

MLA:

Bari, Md Ashfaqul, et al. "Heat recovery optimization of a shell and tube bundle heat exchanger with continuous helical baffles for air ventilation systems." International Journal of Air-Conditioning and Refrigeration 32.1 (2024).

BibTeX: Download