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In this study the thermal performance of three different wickless heat pipe solar collectors were investigated by using pure water, watersurfactant and CNT-water nanofluid for different coolant mass flow rates and tilt angles (20 0 , 31.5 0 , 40 0 , 50 0 and 60 0 ). First collector uses only pure water, the second one utilizes CNT nanoparticle of diameter 10-12 nm and 0.1-10 μm length with water as a base fluid. While the third collector uses water with 150 ppm 2-ethyl-hexanol as coolant fordoi:10.5098/fhp.v4.1.3002 fatcat:znxuxw24wrbabo32itewwp5ub4