A Study on Thermal Effectiveness of Multi-Stages Evaporative Air Cooling


  • Alaa R. Al-Badri Mechanical Engineering Department, Wasit University, Wasit, Iraq
  • Zahraa Mohsin Farhan Mechanical Engineering Department, Wasit University, Wasit, Iraq




Direct evaporative cooling, indirect evaporative cooling; multi-stages.


The air conditioning system performance is significantly affected by temperature rise which causes continuous increase in electricity consumption and pollution problems to environment. Evaporative cooling systems are characterized by their low energy consumption so that they represent successful potential alternatives to traditional vapor compression air conditioning systems. This study investigates the performance of multi-stages evaporative cooling systems experimentally and theoretically. The experimental set-up is mainly composed of two parts: indirect unit to decrease the air temperature and direct unit to moisturize the air. The system is installed and equipped with temperatures, humidity, and air velocity sensors. The experimental tests were run continuously to monitor the system performance at various weather conditions between  to  in June and July months. A mathematical model for the system components was developed and implemented in the Engineering Equation Solver (EES) program to simulate the performance of multi-stages evaporative cooling systems. The results showed that the heat flux  increases with the increase in the Reynolds number Re of inlet air, velocity fraction  extracted air for sensible cooling, air temperature at the product-in , air velocity at the product-in , and the adiabatic efficiency . But, it is decreasing with increasing the spacing between the heat exchanger plates  and the relative humidity at the product-in . Optimum performance was obtained with very small space between plates which was bout 5mm. Good agreement have been shown between experimental and predicted data, where the  results. Uncertainty of experimental data was within the range 4.14 to 6.15.


Download data is not yet available.


Metrics Loading ...


Franco A, Valera DL, Madueno A, Pena A, (2010). Influence of water and air flow on the performance of cellulose evaporative cooling pads used in Mediterranean greenhouse. Trans. ASABE; 53 (2): 565-576.

Rogdakis, E. D., Koronaki, I. P., & Tertipis, D. N. (2013). Estimation of the Water Temperature Influence on Direct Evaporative Cooler Operation. Thermodynamics (IJOT), 16 (4): 172-178.

Ambade, A. P. (2015). Study, Design and Analysis of Two Stages Evaporative Cooling System. International Journal for Scientific Research & Development, 3 (01): 2321-061.

Duan, Z., Zhan, C., Zhao, X., & Dong, X. (2016). Experimental study of a counter-flow regenerative evaporative cooler. Building and Environment, 104: 47-58.

Chen, Yi, Hongxing Yang, and Yimo Luo, (2016). Parameter sensitivity analysis of indirect evaporative cooler (IEC) with condensation from primary air. Energy Procedia, 88: 498–504.

Duan, Z., Zhao, X., Zhan, C., Dong, X., & Chen, H. (2017). Energy saving potential of a counter-flow regenerative evaporative cooler for various climates of China: experiment-based evaluation. Energy and Buildings, 148: 199–210.

Kabeel, A. E., Bassuoni, M. M., & Abdelgaied, M. (2017). Experimental study of a novel integrated system of indirect evaporative cooler with internal baffles and evaporative condenser. Energy Conversion and Management, 138: 518–525.

Sharma A, Darokar H, (2018). Two Stage Indirect/Direct Evaporative Cooling, International Journal on Theoretical and Applied Research in Mechanical Engineering, 7(1): 41-46.

Lee, Joohyun, BongSu Choi, and Dae-Young Lee, (2013). Comparison of configurations for a compact regenerative evaporative cooler. Int. J. Heat Mass Transf., 65: 192-198.

Witt, IncoperaDe, (1981). Fundamentals of Heat Transfer. John Wiley & Sons, New York.




How to Cite

Al-Badri, A. R. ., & Mohsin Farhan, Z. . (2020). A Study on Thermal Effectiveness of Multi-Stages Evaporative Air Cooling. Wasit Journal of Engineering Sciences, 8(2), 1–14. https://doi.org/10.31185/ejuow.Vol8.Iss2.163



Mechanical Engineering