The objective of this research is to explore experimentally the impact of using (Al+Al2O3/distilled water hybrid Nano fluid) as the working fluid on the thermal efficiency of the evacuated tube solar collector with inner cylindrical coil within the vertical tank. The nanoparticles volume fraction was 1,3 and 5 % with the( 50 nm) dimension of nanoparticles. The performance of the evacuated tube solar collector (ETSC) utilizing (Al+Al2O3) hybrid Nano fluid and water was compared to the flow rate within the coil ranged from 15, 30 and 45 l/h.rm2. The results of the current research showed that the highest effectiveness of the solar collector 24.89% for mass flow rate of Nano fluid 45 l/hr.m2 and nanoparticles volume fraction of 5% vol. Findings show that (Al+ Al2O3) hybrid nanofluids could be utilized in an ETSC as working liquids to absorb heat from solar radiation and effectively transform solar energy into thermal energy.
Evaluation and an experimental study of the performance of solar water distillation by using collector box with the aperture area of the water distillation of (1*0.6) m. The obtained results are shown that the amount of distilled water increased with increasing the solar radiation temperature. The highest solar water distillation efficiency was found equal to 11.4% for rainy and partially cloudy day between 8am to 10am for 12/4/2016. Also the second higher efficiency was found equal to 5.155 for a sunny day between 10am to 12 pm for 20/4/2016. The results indicated that the distilled water can be obtained on if even the weather condition very bad and the solar radiation very low as well as the higher amount of distilled water can be obtained at higher values of solar radiation intensity. Experimental results showed the higher ambient temperature lower the condensation, which lowering the amount of distilled water.
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