Staff Members - Benha University
Experimental Investigation for Flow Boiling Heat Transfer Enhancement on R134a Using Nanorefrigerants
ENGINEERING RESEARCH JOURNAL (ERJ) • 2019
Publication Information
Authors
S. A. Elsayed, H. E. Abdelrahman, A. A. Eltohamy, R.Y. Sakr
Keywords
Heat Transfer – Flow Boiling – Nanofluids – Vapor Compression
Journal
ENGINEERING RESEARCH JOURNAL (ERJ)
Publisher
Journal Homepage: www.feng.bu.edu.eg
Volume
Vol. 1, No. 40 April 2019
Issue
Not Available
Pages
pp.48-56
publication.type
Local
Paper Link
Not Available
Supplementary Materials
Not Available
Abstract
Experimental study exploring the heat transfer increase in double tube evaporator of vapor compression unit using
nanorefrigerants is investigated. Aluminum oxide Al₂O₃ and copper oxide CuO nanoparticles are dispersed into
refrigerants R134a, to form nanorefrigerant. Aluminum oxide nanorefrigerant void fraction is ranged from 0.1% to 0.70%
whereas copper oxide nanorefrigerant void fraction is ranged from 0.06% to 0.16%. Nanorefrigerant absorbs its latent
heat of evaporation from hot water flowing in the annular space of the evaporator.
The effect of nanorefrigerant void fraction, heat flux, and the hot water flow rate and its temperature at the evaporator
inlet on flow boiling heat transfer is illustrated. The results showed that higher values of heat transfer coefficient (h.t.c)
are attained in case of using R134a. Also, a maximum value of the htc at void fraction of 0.09% CuO nanoparticle and
0.5% of Al2O3 nanoparticles for R134a is noticed. Empirical correlation equations for the htc in terms of the operating
parameter are obtained.
nanorefrigerants is investigated. Aluminum oxide Al₂O₃ and copper oxide CuO nanoparticles are dispersed into
refrigerants R134a, to form nanorefrigerant. Aluminum oxide nanorefrigerant void fraction is ranged from 0.1% to 0.70%
whereas copper oxide nanorefrigerant void fraction is ranged from 0.06% to 0.16%. Nanorefrigerant absorbs its latent
heat of evaporation from hot water flowing in the annular space of the evaporator.
The effect of nanorefrigerant void fraction, heat flux, and the hot water flow rate and its temperature at the evaporator
inlet on flow boiling heat transfer is illustrated. The results showed that higher values of heat transfer coefficient (h.t.c)
are attained in case of using R134a. Also, a maximum value of the htc at void fraction of 0.09% CuO nanoparticle and
0.5% of Al2O3 nanoparticles for R134a is noticed. Empirical correlation equations for the htc in terms of the operating
parameter are obtained.