Abstract:This paper aims to study the effect of the addition of Al2O3, CuO and ZnO nano particles to R134a on the evaporative heat transfer coefficient. A horizontal copper tube in a tube heat exchanger is designed and constructed here as a part of the experimental test rig. The heating load is provided by hot water passing through an annulus surrounding the inner copper tube. Measurements were carried out using heat flux ranged from 40 to 80 kW/m2 and nano fluid concentrations ranged from 0.25 % to 1.2 % and nano part… Show more
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