Performance Investigation of Evacuated Tube Collector using Different Nano fluids Applied to Winter Climatic Conditions in Egypt

Abstract

In this paper, the performance of the evacuated tube solar collector is investigated theoretically by the TRNSYS program. The simulation is conducted during the winter of 14th February-2019 in Cairo – Egypt. In this simulation, water and Nanofluids are
working fluids. The types of Nanofluids are CeO2/water, WO3/water and AL2O3/water. The simulation is conducted at0.015%,
0.025%, 0.035% and 0.045% (volume concentrations).The mass flux rate and tilt angle are 0.017 kg/s.m2and 45o; respectively.
The results show that the collector has the highest performance using nanofluids at studied concentrations. At 12:00 PM, the
highest useful energy gain can be obtained from CeO2/water Nanofluid at 0.045% concentration, while thermal efficiency is
higher by 34.2% than water. The nanofluidWO3/water presents low performance than that of CeO2/water and AL2O3/water. The thermal efficiencies ofAL2O3/ water and WO3/ water Nanofluids are higher than water by 28.4% and 12.5%; respectively, at
concentration of 0.045% and 12:00PM