Experimental Investigation Of Parabolic Dish Solar Collector Using Nanofluids For Steam Cooking

Abstract

Renewable Energy Sources Play An Important Role In Heating Applications. Among The Renewable Sources Of Energy, Solar Energy Is Considered The Most Abundant And Viable Option For Thermal Energy Applications. Cooking Is One Of The Most Essential Human Activities In Everyday Life. The Energy Demand For Cooking Is Fulfilled By Conventional Energy Sources Like Biofuels, Fossil Fuels And Electricity. Environmental Degradation, Harmful Gas Emissions, And The Increase In Prices Of Fuel And Electricity Are The Main Driving Forces Behind The Need For More Effective Utilization Of Renewable Energy. Parabolic Dish Solar Collector Is A Device Collects Solar Radiation And Converts Into Thermal Energy To The Fluid. To Improve The Performance Of A Collector A High Heat Transfer Fluid Is Used. Sol-Gel and Precipitation Methods Are Used to Synthesis Aluminum Oxide and Zinc Oxide Nano particles, Respectively. In This Study, Nano fluids Are Used To Enhance The Heat Transfer Due To Their High Thermal Conductivity Compared With The Base Fluid. Two-Step And Single-Step Methods Are Techniques For The Preparation Of Nano fluid. In This Thesis, A Two-Step Method Was Used. The Performance Analysis Of Parabolic Dish Solar Collector With And Without Nan of luids Was Studied. The Result Obtained Showed That The Collector Efficiency For 1% Of Volume Fraction Of Nano particles For Aluminum Oxide And Zinc Oxide As Htf Is 69.13% And 65.5% Respectively. Similarly, The Thermal Efficiency Of The Collector For A Volume Fraction Of 2% Of Al2o3 And Zno Nano fluids Was 71.63% And 67.99% Respectively. The Efficiency Of Parabolic Dish Solar Collector Using Water As Working Fluid Obtained Was Obtained 61.6%. The Outlet Temperature For Volume Fraction 1% For Aluminum Oxide And Zinc Oxide Nanofluid As Htf Is 456 And 452 K Respectively. Similarly, The Outlet Temperature For A Volume Fraction Of 2% Of Aluminum Oxide And Zinc Oxide Nano fluid Was 459.6 And 454.7 K Respectively. The Maximum Average Outlet Temperature Of The Water As A Working Fluid Was 439.4 K. No Load Test Established The Cooking Ability Of The Cooker, Water Boiling Test And Actual Load Test Is Performed. The Actual Load Was Pasta And The Time Taken To Cook Was 33 Min. The Experimental Result Of Latent Heat Storage Using Mgcl2.6h2o Showed That Time It Takes And Amount Of Sensible, Latent And Total Energy Stored/Released During The Charging/Discharging Processes Are Found To Be 125 Min, 1.92, 1.436 And 3.35 Mj And 161 Min, 1.57, 1.35 And 2.92 Mj Respectively. From The Result Obtained The Aluminum Oxide Nanofluids Have Good Heat Transfer Than Zinc Oxide. The Performance Test Revealed That The Maximum Amount Of The First Figure Of Merits (F1) Obtained Was 0.31 K 2/W And The Second Figure Of Merits (F2) For The Cooker Was Evaluated From The Water Boiling Test And Found To Be 0.42 K M2/W.