About the Journal :
Experimental and Theoretical NANOTECHNOLOGY (ETN) is a multidisciplinary peer-reviewed international journal published three issues a year. It includes specialized research papers, short communications, reviews and selected conference papers in special issues on the characterization, synthesis, processing, structure and properties of different principles and applications of NANOTECHNOLOGY; with focus on advantageous achievements and applications for the specialists in engineering, chemistry, physics and materials science.
ETN covers and publishes all aspects of fundamental and applied researches of experimental and theoretical nanoscale technology dealing with materials synthesis, processing, nanofabrication, nanoprobes, spectroscopy, properties, biological systems, nanostructures, nanoelectronics, nano-optics, nano-mechanics, nanodevices, nanobiotechnology, nanomedicine, nanotoxicology within the scope of the journal. ETN aims to acquire the recent and outstanding researches for the benefit of the human being.
The aim of this work is to enhance the photovoltaic / thermal system performance by dissipating the high heat stored inside the PV panels. A new design of front and back cooling systems have been made based on spraying water on the front surface and circulation of a Nanofluid (AL2O3 – H2O) in the back cooper pipes with a small heat exchanger. Deionized water and Nanopowder AL2O3 are mixed homogenously to be the working fluid and used as a cooling fluid in the back closed system .Concentration ratios of Nanopowder are (0.1,0.2, 0.3,0.4,and 0.5) % with a different mass flow rates of water are applied . The thermal and electrical performance of PV/T was recorded as a function of solar irradiation intensity and temperature on the PV panel surface. The temperature of PV panel dropped from 76℃ to 64℃ with front and back cooling by water. This dropping in temperature led to increase the average electrical PV efficiency to (7.5) % at an optimum flow rate of (2L/min.). When using Nanofluid (AL2O3 − H2O), the temperature dropped significantly to (45℃) at a concentration ratio of (0.3%) causing an increment in the PV efficiency of (10.9) %.
Keywords: PV performance; PV cooling; Nanofluids applications; Water pumping system.