Analysis of Fouling in HVAC Heat Exchangers by CFD

Document Type: Research Article

Authors

1 Research Institute of Petroleum Industry (RIPI), Tehran, I.R. IRAN

2 Department of Chemical Engineering, Islamic Azad University, Science and Research Branch, Tehran, I.R. IRAN

Abstract

The purpose of this study is to identify parameters influence on the particle deposition within fin and tube heat exchanger of air-conditioning systems by CFD analysis. First the basic sketch of periodic geometry drawn and meshing operation including boundary conditions was performed. Then the gas side properties and flow parameters were solved by ANSYS Fluent 14.5 software. Lagrangian equations used for modeling dispersed phase and effect of injecting various particle sizes evaluated by Rosin-Rammler model. Moreover turbulence effect was investigated using discrete random walk model. Consequently it is observed that deposition rate is highly affected by particles diameter in which leads to 90% deposition for particles over 30 µm in diameter.

Keywords


[1] Siegel J.A., “Particulate Fouling of HVAC Heat Exchangers”, University of California, Berkeley, (2002).

[2] Jafari Nasr M.R., “Heat Exchanger Fouling”, Research Institute of Petroleum Industry (RIPI) Publications Center, Iran (2011).

[3] Sun Y., Zhang Y., Baker D, Experimental Evaluation of Air-Side Particulate Fouling Performance Heat Exchanger, ASHRAE Transactions: 2-4 (2012).

[4] Siegel J.A., Nazaroff W.W., Predicting Particle Deposition on HVAC Heat Exchangers, Elsevier Ltd.: 2-4 (2003).

[5] McDowall R., “Fundamentals of HVAC Systems” Butterworth-Heinemann publications:19-23 (2006).

[6] Chuan Wang C., Recent Advances in Fin-and-Tube Heat Exchanger, World Scientific. J. Air Conditioning & Refrigeration; 3(2011).

[7] Laohalertdecha S., Dalkilic A.S., Wonfwises S., A Review on the Heat Transfer Performance and Pressure Drop Characteristics of Various Enhanced Tubes, World Scientific. J. Air Conditioning & Refrigeration: 5 (2012).

[8] Shah R.K., Sekulic D.P., “Fundamentals of Heat Exchanger design”, John Wiley & Sons, Canada (2003).

[9] Gosman A.D., Developments in Industrial Computational Fluid Dynamics, Trans. IChemE, (1998).

[10] Lawler S.D., “Computational Study of Particle Deposition within a HVAC Heat Exchanger”, Collage of Engineering and Computing of South California: 10-80 (2008).

[11] Jones J.W., Crawford R.H., Krishnan V., Vliet G.C., Wood, K.L., "Functional Model and Second Law Analysis Method for Energy Efficient Process Design: Applications in HVAC Systems Design", Vigain Harutunian Publications, The university of Texas at Austin: 6-10 (2003).

[12] Chow J.C., Watson J.G., “Guideline on Speculated Particulate Monitoring", Office of Air Quality Planning and Standards: 49 (1998).

[13] Fluent 6.3.26, User Guide, “Discrete Phase Models: CHP. 19 (2006) & “Overview and Limitations of the Discrete Phase Method”: CHP 23(2006).