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Experimental and numerical study of an evaporatively-cooled condenser of air-conditioning systems

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  • Islam, M.R.
  • Jahangeer, K.A.
  • Chua, K.J.

Abstract

The performance of an air-conditioning unit with evaporately-cooled condenser coil is studied experimentally and numerically. An experimental setup is fabricated by retrofitting a commercially available air-conditioning unit and installing comprehensive measuring sensors and controllers. Experimental result shows that the COP (Coefficient of Performance) of the evaporately-cooled air-conditioning unit increases by about 28% compared to the conventional air cooled air-conditioning unit. To analyze the heat and mass transfer processes involved in the evaporately-cooled condenser, a detailed theoretical model has been developed based on the fluid flow characteristics of the falling film and the thermodynamic aspect of the evaporation process. Simulated results agree well with experimental data. The numerical model provides new insights into the intrinsic links between operating variables and heat transfer characteristics of water film in evaluating the performance of evaporatively-cooled condenser system. Two heat transfer coefficients, namely, wall to bulk and bulk to interface are introduced and computed from the simulation results under different operating conditions. Finally, the overall heat transfer coefficient for the water film is computed and presented as a function of dimensionless variables which can conveniently be employed by engineers to design and analyze high performance evaporatively-cooled heat exchangers.

Suggested Citation

  • Islam, M.R. & Jahangeer, K.A. & Chua, K.J., 2015. "Experimental and numerical study of an evaporatively-cooled condenser of air-conditioning systems," Energy, Elsevier, vol. 87(C), pages 390-399.
    • Handle: RePEc:eee:energy:v:87:y:2015:i:c:p:390-399
    DOI: 10.1016/j.energy.2015.05.005
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    References listed on IDEAS

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    1. Kim, Min-Hwi & Jeong, Jae-Weon, 2013. "Cooling performance of a 100% outdoor air system integrated with indirect and direct evaporative coolers," Energy, Elsevier, vol. 52(C), pages 245-257.
    2. Nasr, M.M. & Hassan, M. Salah, 2009. "Experimental and theoretical investigation of an innovative evaporative condenser for residential refrigerator," Renewable Energy, Elsevier, vol. 34(11), pages 2447-2454.
    3. Anisimov, Sergey & Pandelidis, Demis & Danielewicz, Jan, 2015. "Numerical study and optimization of the combined indirect evaporative air cooler for air-conditioning systems," Energy, Elsevier, vol. 80(C), pages 452-464.
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    Cited by:

    1. Cui, X. & Islam, M.R. & Mohan, B. & Chua, K.J., 2016. "Theoretical analysis of a liquid desiccant based indirect evaporative cooling system," Energy, Elsevier, vol. 95(C), pages 303-312.
    2. Harby, K. & Gebaly, Doaa R. & Koura, Nader S. & Hassan, Mohamed S., 2016. "Performance improvement of vapor compression cooling systems using evaporative condenser: An overview," Renewable and Sustainable Energy Reviews, Elsevier, vol. 58(C), pages 347-360.
    3. Xin Cui & Le Sun & Sicong Zhang & Liwen Jin, 2019. "On the Study of a Hybrid Indirect Evaporative Pre-Cooling System for Various Climates," Energies, MDPI, vol. 12(23), pages 1-16, November.

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