• Vol 7, No 2 (2016)
  • Mechanical Engineering

Optimization of the Friction Factor and Frictional Pressure Drop of R22 and R290

Normah Ghazali, Qais Abid Yousif, Agus S. Pamitran, Sentot Novianto, Robiah Ahmad


Published at : 29 Feb 2016
IJtech : IJtech Vol 7, No 2 (2016)
DOI : https://doi.org/10.14716/ijtech.v7i2.2989

Cite this article as:

Ghazali, N., Yousif, Q.A., Pamitran, A.S., Novianto, S., Ahmad, R., 2016. Optimization of the Friction Factor and Frictional Pressure Drop of R22 and R290. International Journal of Technology. Volume 7(2), pp.227-234

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Normah Ghazali Faculty of Mechanical Engineering, Universiti Teknologi Malaysia 81310 Skudai, Johor, Malaysia
Qais Abid Yousif Faculty of Mechanical Engineering, Universiti Teknologi Malaysia 81310 Skudai, Johor, Malaysia
Agus S. Pamitran Department of Mechanical Engineering, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia
Sentot Novianto Department of Mechanical Engineering, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia
Robiah Ahmad UTM Razak School of Engineering and Advanced Technology, Universiti Teknologi Malaysia 54100 JalanSemarak, Kuala Lumpur, Malaysia
Email to Corresponding Author

Abstract
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Today, the air-conditioning and refrigeration industry is still searching for environmentally friendly refrigerants that could replace hazardous, ozone-depleting coolants – refrigerants that behave similarly, if not better, than the present ones. The present study examines optimization of the frictional pressure drop of R22 and R290 using genetic algorithm. Outcomes are compared against the measured pressure drop obtained from a horizontal 7.6 mm channel with a length of 1.07 meters. Three equations have been used for calculating the Darcy friction factor and two-phase flow pressure drop for both laminar and turbulent flow regimes in smooth and rough tubes. The effects of the different correlations for the friction factor and pressure drop utilized are demonstrated. The results illustrate that the differences between values of the Darcy friction factor are very small for the two refrigerants examined, with the frictional pressure of R-290 higher than R-22. Use of a smaller channel induced a much higher frictional pressure drop, as well.

Darcy friction factor, Genetic algorithm, Optimization, Pressure drop

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