Numerical model of a cross-flow heat exchanger with non-uniform flow of media
Abstract
Typical thermodynamic analysis of a heat exchanger is realized taking into account some simplifying assumptions. One of them is uniform flow of media through the device. However, this assumption is rarely fulfilled in reality and an influence of a non-uniform flow of media could be significant for heat exchanger performance. Deterioration of the heat exchanger efficiency could be up to 18% (according to results of numerical and experimental investigations realized in the Institute of Thermal Technology of the Silesian University of Technology). Therefore, in some particular analyses the non-uniformity of media flow should be taken into account.The first numerical model of a cross-flow finned heat exchanger was elaborated at the ITT SUT ten years ago. This is simplified model based on the finite differences method. The model was next implemented into fast running computer code HEWES. Experimental validation of this code has shown some important discrepancies. One of possible reasons of such situation are some simplifications in geometry of numerical model. This problem can be solved by applying the CFD modeling methodology. Building a model of the whole finned heat exchanger is very time consuming and such model would need very powerful computer to run. Considering this the authors postulate a possibility of using some simplified 3D models of recurrent segments of heat exchanger in order to consider the non-uniform flow of media and simulate the work of the whole device. The methodology of creating these models, running calculations and results of very initial experimental validation will be presented in the paper.References
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[3] R. Pi ˛ atek, Thermal analysis of plate fin and tube heat exchanger with unequal inlet of media, Ph.D. thesis, Sielsian University of Technology, Institute of Thermal Technology, Gliwice, Poland (2003).
[4] K. Ranganayakulu, Ch.and Seetharamu, K. Sreevatsan, The eects of inlet fluid flow nonuniformity on thermal performance and pressure drops in crossflow plate-fin compact heat exchangers, International Journal of Heat and Mass Transfer 40 (1) (1996) 27–38.
[5] M. Andrecovich, R. Clarke, Simple modeling of flow maldistribution in plate-fin exchangers, in: Proceedings of the 21st IIR International Congress of Refrigeration, Paper ICR0639, Washington DC, USA, 2003.
[6] S. Nair, S. Verma, S. Dhingra, Rotary heat exchanger performance with axial heat dispersion, International Journal of Heat and Mass TransferInternational Journal of Heat and Mass Transfer 41 (18) (1998) 2857–2864.
[7] K. Lee, S. Oh, Optimal shape of the multi-passage branching system in a single-phase parallel-flow heat exchanger, International Journal of Refrigeration 27 (1) (2004) 82–88.
[8] A. Mueller, Eects of some types of maldistribution on the performance of heat exchanger, Heat Transfer Engineering 8 (2) (1987) 75–86.
[9] S. Lalot, P. Florent, S. Lang, A. Bergles, Flow maldistribution in heat exchangers, Applied Thermal Engineering 19 (8) (1999) 847–863.
[10] X. Luo, W. Roetzel, U. Lüdersen, The single-blow transient technique considering longtitudinal core conduction and fluid dispersion, International Journal of Heat and Mass Transfer 44 (1) (2001) 121–129.
[11] R. Berryman, C. Russell, The eect of maldistribution of air flow on aircooled heat exchanger performance, Maldistribution of flow and its eect on heat exchanger performance, J.B. Kitto, J.M. Robertson ASME Htd 75 (1987) 19–23.
[12] C. Meyer, D. Kröger, Plenum chamber flow losses in forced draught air-cooled heat exchangers, Applied Thermal Engineering 18 (9-10) (1998) 875–893.
[13] N. Srihari, B. Rao, B. Sunden, S. K. Das, Transient response of plate heat exchangers considering eect of flow maldistribution, International Journal of Heat and Mass Transfer 48 (15) (2005) 3231–3243.
[14] N. Srihari, S. K. Das, Transient response of multi-pass plate heat exchangers considering the eect of flow maldistribution, Chemical Engineering and Processing: Process Intensification 47 (4) (2008) 695–707.
[15] B. Rao, B. Sunden, S. K. Das, An experimental investigation of the port flow maldistribution in small and large plate package heat exchangers, Applied Thermal Engineering 26 (16) (2006) 1919–1926.
[16] K. Shaji, S. Das, The eect of flow maldistribution on the evaluation of axial dispersion and thermal performance during the single-blow testing of plate heat exchangers, International Journal of Heat and Mass Transfer 53 (7-8) (2010) 1591–1602.
[17] T. Bury, J. Składzie´n, R. Pi ˛ atek, Validation and sensitivity analysis of the mathematical model of a cross-flow heat exchanger with non-uniform flow of agents, Systems - Journal of Transdisciplinary Systems Science 13 (1) (2008) 19–27.
[18] D. Taler, A. Cebula, Numerical modeling of the heat transfer in the lamel type heat exchangers, in: Proceedings of the 12th Symposium on Heat and Mass Transfer, Vol. 2, Kraków, Poland, 2004, pp. 827–836.
[19] D. Taler, A. Sury, Mathematical models of pipe type cross-flow heat exchangers and application for regulation of media outlet temperature, Cracow University of Technology, MonographCracow University of Technology, Monograph, Mechanics series (437).
[20] K. Futyma, M. Wołowicz, J. Milewski, W. Bujalski, J. Lewandowski, Utilization of flue gas low temperature heat from the power unit, Rynek Energii 96 (2011) 74–79.
Published
2013-12-03
How to Cite
HANUSZKIEWICZ-DRAPAŁA, Małgorzata Joanna; BURY, Tomasz; WIDZIEWICZ, Katarzyna.
Numerical model of a cross-flow heat exchanger with non-uniform flow of media.
Journal of Power Technologies, [S.l.], v. 93, n. 5, p. 295--302, dec. 2013.
ISSN 2083-4195.
Available at: <https://papers.itc.pw.edu.pl/index.php/JPT/article/view/491>. Date accessed: 21 nov. 2024.
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Section
RDPE 2013 Conference
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