Transient thermal study of recuperative tube in tube heat exchanger operating in refrigeration system using experimental test and mathematical simulation

Saberimoghaddam, A.; Bahri Rasht Abadi, M. M

Document Type : Full article

Authors

Department of Chemistry and Chemical Engineering, Faculty of Chemical Engineering, Malek Ashtar University of Technology (MUT), Lavizan 158751774, Tehran, Iran

Abstract

Joule-Thomson cooling systems are used in refrigeration and liquefaction processes. There are extensive studies on Joule-Thomson cryogenic systems, but most of them coverage steady state conditions or lack from experimental data. In the present work, transient thermal behavior of Joule-Thomson cooling system including counter current helically coiled tube in tube heat exchanger, expansion valve, and collector was studied by experimental tests and simulations. The experiments were carried out by small gas liquefier and nitrogen gas as working fluid. The recuperative heat exchanger was thermally analyzed by experimental data obtained from gas liquefier. In addition, the simulations were performed by an innovative method using experimental data as variable boundary conditions. A comparison was done between presented and conventional methods. The effect of collector mass and convection heat transfer coefficient was also studied using temperature profiles along the heat exchanger. The higher convection heat transfer coefficient in low-pressure gas leads to increase in exchanging energy between two streams and faster cooling of heat exchanger materials, but the higher convection heat transfer coefficient in high-pressure gas does not influence on cool-down process.

Keywords

20.1001.1.17355397.2017.14.3.1.5

Main Subjects

References

[1] Damle, R. and Atrey, M., “The cool-down behaviour of a miniature Joule-Thomson (J-T) cryocooler with distributed J-T effect and finite reservoir capacity”, Cryogenics, 71, 47 (2015).

[2] Pacio, J. C. and Dorao, C. A., “A review on heat exchanger thermal hydraulic models for cryogenic applications”, Cryogenics, 51 (7), 366 (2011).

[3] Aminuddin, M. and Zubair, S. M., “Characterization of various losses in a cryogenic counterflow heat exchanger”, Cryogenics, 64, 77 (2014).

[4] Krishna, V. et al., “Effect of longitudinal wall conduction on the performance of a three-fluid cryogenic heat exchanger with three thermal communications”, International Journal of Heat and Mass Transfer, 62, 567 (2013).

[5] Gupta, P. K., Kush, P. and Tiwari, A., “Second law analysis of counter flow cryogenic heat exchangers in presence of ambient heat-in-leak and longitudinal conduction through wall”, International Journal of Heat and Mass Transfer, 50 (23), 4754 (2007).

[6] Nellis, G., “A heat exchanger model that includes axial conduction, parasitic heat loads, and property variations”, Cryogenics, 43 (9), 523 (2003).

[7] Narayanan, S. P. and Venkatarathnam, G., “Performance of a counterflow heat exchanger with heat loss through the wall at the cold end”, Cryogenics, 39 (1), 43 (1999).

[8] Ranganayakulu, C., Seetharamu, K. and Sreevatsan, K., “The effects of longitudinal heat conduction in compact plate-fin and tube-fin heat exchangers using a finite element method”, International Journal of Heat and Mass Transfer, 40 (6), 1261 (1997).

[9] Chou, F. C. et al., “Preliminary experimental and numerical study of transient characteristics for a Joule-Thomson cryocooler”, Cryogenics, 35 (5), 311 (1995).

[10] Tzabar, N. and Kaplansky, A., “A numerical cool-down analysis for Dewar-detector assemblies cooled with Joule-Thomson cryocoolers”, International Journal of Refrigeration, 44, 56 (2014).

[11] Hong, Y. J. et al., “The cool-down characteristics of a miniature Joule-Thomson refrigerator”, Cryogenics, 46 (5), 391 (2006).

[12] Maytal, B., “Cool-down periods similarity for a fast Joule-Thomson cryocooler”, Cryogenics, 32 (7), 653 (1992).

[13] Chien, S. B., Chen, L. T. and Chou, F.C., “A study on the transient characteristics of a self-regulating Joule-Thomson cryocooler”, Cryogenics, 36 (12), 979 (1996).

[14] Xin, R. and Ebadian, M., “The effects of Prandtl numbers on local and average convective heat transfer characteristics in helical pipes”, Journal of Heat Transfer, 119 (3), 467 (1997).

[15] Saberimoghaddam, A. and Bahri Rasht Abadi, M. M., “Influence of tube wall longitudinal heat conduction on temperature measurement of cryogenic gas with low mass flow rates”, Measurement, 83, 20 (2016).

Iranian Journal of Chemical Engineering(IJChE)

Transient thermal study of recuperative tube in tube heat exchanger operating in refrigeration system using experimental test and mathematical simulation

References

References

Volume 14, Issue 3
Summer 2017
Pages 3-18

Transient thermal study of recuperative tube in tube heat exchanger operating in refrigeration system using experimental test and mathematical simulation

References

References

Volume 14, Issue 3Summer 2017Pages 3-18

Volume 14, Issue 3
Summer 2017
Pages 3-18