INFLUENCE OF THE ENHANCED TUBES FOR STEAM CONDENSATION ON HORIZONTAL TUBE BUNDLE IN THE ABSORPTION CHILLER

Öz

This work presents the numerically analyses for condensation of steam outside the horizontal tube bundle in the absorption chiller. The objective of this paper was to numerically compare the effect of three different types of horizontal tube bundle on different heat transfer parameters of absorption chiller. For this purpose, three types of tubes including simple tube, tube with external fin, and tube with internal groove were analyzed. Two-equation turbulence models have been used to simulate the flow field and heat transfer and the finite volume method was applied for numerical analyses using CFX software. The results showed that adding the external fin or inner groove to the tube, increased the heat transfer coefficient of tube bundle in absorption chiller. Due to the increase of heat transfer in condenser equipped with finned and grooved tubes, it was shown that the rate of steam condensation in these heat exchangers would be higher. The percentage of outlet condensate in the condenser with finned and grooved tubes were about 4.8 times of the heat exchanger with a simple tube. In conclusion, the overall findings indicated the increased performance of the condenser for the horizontal oriented tube bundles with external fin and internal groove. This work is a numerical part of a comprehensive research and its experimental part will be presented in the future work.

Anahtar Kelimeler

• Heat Exchanger
• Horizontally Oriented Condensers
• Computational Fluid Dynamics
• Simple Tube
• Tube with External Fin
• Tube with Internal Groove.

Kaynakça

1. Bonneau, C., Popov, D., Gebauer, T., Kleiner, T., Chen, J., Saleh, E. A., et al. (2019). Comprehensive review of pure vapour condensation outside of horizontal smooth tubes. Nuclear Engineering and Design, 349, 92–108. https://doi.org/10.1016/j.nucengdes.2019.04.005
2. Cavallini, A., Col, D., Del Col, D., Longo, G. A., & Rossetto, L. (2003). Condensation inside and outside smooth and enhanced tubes: A review of recent research. International Journal of Refrigeration, 26(4), 373–392. https://doi.org/10.1016/S0140-7007(02)00150-0
3. Chen, J., Sun, Z., Zhang, X., & Yan, W. (2019). Precision determination of film condensation row effect of R134a condensation on an array of horizontal plain tubes. Experimental Thermal and Fluid Science, 109, 109849. https://doi.org/10.1016/j.expthermflusci.2019.109849
4. Dalkilic, A. S., & Wongwises, S. (2009). Intensive literature review of condensation inside smooth and enhanced tubes. International Journal of Heat and Mass Transfer, 52(15–16), 3409–3426. https://doi.org/10.1016/j.ijheatmasstransfer.2009.01.011
5. Dobson, M. K., & Chato, J. C. (1998). Condensation in smooth horizontal tubes. Journal of Heat Transfer, 120(1), 193–213. https://doi.org/10.1115/1.2830043
6. García-Valladares, O. (2003). Review of in-tube condensation heat transfer correlations for smooth and microfin tubes. Heat Transfer Engineering, 24(4), 6–24. https://doi.org/10.1080/01457630304036
7. Gebauer, T., Korn, T., & Ziegler, F. (2013). Condensation heat transfer on single horizontal smooth and finned tubes and tube bundles for R134a and propane. International Journal of Heat and Mass Transfer, 56(1–2), 516–524. https://doi.org/10.1016/j.ijheatmasstransfer.2012.09.049
8. Ghedira, A., Saada, R., Soualmia, A., & Baccar, M. (2025). Numerical simulation of incompressible two-phase flows with phase change process in porous media. Results in Engineering, 25, 103706. https://doi.org/10.1016/j.rineng.2024.103706

9. Infante Ferreira, C. A., Bandarra Filho, E. P., & Pires, R. (2003). R404A condensing under forced flow conditions inside smooth, microfin and cross-hatched horizontal tubes. International Journal of Refrigeration, 26(4), 433–441. https://doi.org/10.1016/S0140-7007(02)00156-1
10. Kharangate, C. R., & Mudawar, I. (2017). Review of computational studies on boiling and condensation. International Journal of Heat and Mass Transfer, 108, 1164–1196. https://doi.org/10.1016/j.ijheatmasstransfer.2016.12.065
11. Kleiner, T., Gebauer, T., & Ziegler, F. (2019). CFD model and simulation of pure substance condensation on horizontal tubes using the volume of fluid method. International Journal of Heat and Mass Transfer, 138, 420–431. https://doi.org/10.1016/j.ijheatmasstransfer.2019.04.054
12. Popov, D., Kuznetsov, G., & Strizhak, P. (2019). Cryogenic heat exchangers for process cooling and renewable energy storage: A review. Applied Thermal Engineering, 153, 275–290. https://doi.org/10.1016/j.applthermaleng.2019.02.106
13. Rifert, V., & Sereda, V. (2015). Condensation inside smooth horizontal tubes: Part 1. Survey of the methods of heat-exchange prediction. Thermal Science, 19(5), 1769–1789. https://doi.org/10.2298/TSCI140522036R
14. Saleh, E. A., & Ormiston, S. J. (2016). A sharp-interface elliptic two-phase numerical model of laminar film condensation on a horizontal tube. International Journal of Heat and Mass Transfer, 102, 1169–1179. https://doi.org/10.1016/j.ijheatmasstransfer.2016.07.013
15. Wongwises, S., & Polsongkram, M. (2006). Condensation heat transfer and pressure drop of HFC-134a in a helically coiled concentric tube-in-tube heat exchanger. International Journal of Heat and Mass Transfer, 49(23–24), 4386–4398. https://doi.org/10.1016/j.ijheatmasstransfer.2006.05.010
16. Yang, L., & Shen, S. (2008). Experimental study of falling film evaporation heat transfer outside horizontal tubes. Desalination, 220(1–3), 654–660. https://doi.org/10.1016/j.desal.2007.02.046
17. Yang, Z., Li, D., Liang, Y., & Chen, H. (2008). Numerical and experimental investigation of two-phase flow during boiling in a coiled tube. International Journal of Heat and Mass Transfer, 51(5–6), 1003–1016. https://doi.org/10.1016/j.ijheatmasstransfer.2007.05.025
18. Zhang, J., Liu, Y., Wu, H., & Chen, X. (2025). Condensation heat transfer efficiency analysis of horizontal double-sided enhanced tubes. Energies, 18(9), 2390. https://doi.org/10.3390/en18092390