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A Numerical Rating Model for Thermal Design of Air Cooled Condensers in the Industrial Applications

American Journal of Mathematical and Computational Sciences
Vol.1 , No. 1, Publication Date: May 13, 2016, Page: 18-28

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Authors

[1]	Ali Hussain Tarrad, Private Consultant, Thermal Engineering Specialist, Copenhagen, Denmark.
[2]	Ali F. Altameemi, Mechanical Engineering, Adhwa Alshamal Contracting and General Trading, Baghdad, Iraq.
[3]	Deyaa M. Mahmood, Technical Training Department, Technical Institute, the Foundation of Technical Institutes, Baghdad, Iraq.

Abstract

The thermal assessment of a water chiller air cooled condenser is outlined in the present work. The steady state experimental data of a water chiller unit was implemented to build a tube by tube model to investigate the louvered finned tube air cooled condenser performance. The refrigerants selected for this object were R-22, R-134a, R-404A and R-407C for the ambient dry bulb temperature range of (24 – 46)°C. The validation of the present numerical model for pure and zeotropic mixtures showed a reasonable agreement between experimental and those predicted values. The maximum scatter between experimental and predicted condenser duty was within (±8)% for R-22, R-134a and R-407C refrigerants. The predicted condenser exit air temperature showed a lower scatter for these refrigerants to be within (±4)%. The model prediction for R-404A refrigerant underestimated the heat duty and exit air dry bulb temperature by (30)% and (15)% respectively.

Keywords

Condensation, Heat Exchangers, Air Cooled, Modeling, Refrigeration, Numerical

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