Thermal Performance of Two Phase Thermosyphon Flat-Plate Solar Collectors Using Nanofluid

Abstract

A solar heat pipe collector was designed and fabricated to study its performance of the outdoor test condition. The thermal performance of the wickless heat pipe solar collector was investigated for pure water and nanofluid with varied range of CNT nanofluid concentration (0.15%, 0.45%, 0.60%, and 1% by volume) and various tilt angles (20 deg, 32 deg, 40 deg, 50 deg, and 60 deg). CNT nanoparticles with diameter 10–12 nm and 0.1–10 μm length are used in the present experimental investigation. The optimal value of CNT nanofluid concentration for better performance is obtained from the investigation. The thermal performance of the heat pipe solar collector with CNT nanofluid is compared to that of pure water.

Thermal Performance of Automobile Radiator Using Carbon Nanotube-Water Nanofluid—Experimental Study

“…The morphological characterization for CNT was obtained by using scanning electron microscopy (FESEM, Carl Zeiss Microscopy, Germany) and is shown in Fig. 1 [2,18]. In this study, we used two different treatment methods in order to prepare stable nanofluids for the investigation.…”

“…FCNT nanofluids with a different nanoparticle concentration (u ¼ 0.15%, 0.45%, 0.60%, and 1%) were prepared by the functionalization acid treatment method [2,[18][19][20][21][22]. According to this method, simple acid treatment provides good stability in water to carbon nanotubes suspension.…”

“…Because of excellent thermal properties, CNT nanofluids reported enormous enhancement in heat transfer [2,[11][12][13][14][15][16][17]. In view of this, an attempt has been made to study the heat transfer performance of CNT-water nanofluid with and without surfactant as coolant for automobile radiator.…”

“…The fluids that contain nanometer size particles are termed as nanofluids. Nanofluids are used in various applications such as: automobile, solar energy conversion, manufacturing, and micro-electronics because of their improved thermal properties [2][3][4][5][6][7][8][9].…”

Comparative Study on Heat Transfer Enhancement of Low Volume Concentration of Al2O3–Water and Carbon Nanotube–Water Nanofluids in Laminar Regime Using Helical Screw Tape Inserts

“…The acid treatment method essentially introduces hydroxyl group at the surface of CNT leading to conversion of the CNT surface from hydrophobic to hydrophilic. Initially, CNTs were initially immersed in a mixture of H 2 SO 4 /HNO 3 (3:1) at room temperature to break up the winding state [21][22][23][24][25][26][27][28][29]. Later on, CNTs were treated in an ultrasound bath (USBT-9.0L Ultrasonic Cleanser, 200 W, Rico Scientific Industries, India) for 2 h and upheld for 15 h. Further, this solution was neutralized by using ammonium hydroxide and filtered with a 0.22 mm cellulose acetate membrane.…”