Abstract
Heat pipe solar collectors (HPSCs) are heat exchangers that carry heat based on the phase change of the heat pipe working fluid. It is aimed to increase the operating temperature range of solar collectors by changing the phase of the working fluid in the heat pipe at low temperature. For this reason, it has become widespread to use nanofluids obtained by mixing nanosized metal oxides with the base fluid in certain proportions in order to increase both the thermal conductivity of the heat pipe working fluids and to increase the specific heat closures. The main purpose of this study, which was conducted to evaluate the performance of HPSCs, is to increase performance, and an experimental study has been conducted in this direction. For this purpose, an HPSC designed and manufactured was used. Al2O3-water and TiO2-water nanofluids containing 2% nanoparticles were used in order to increase performance in the study. HPSC used in the study consists of 8 heat pipes with a length of 100 cm. The experiments were carried out for pure water and nanofluids, and their efficiency and strength were compared. The highest value of instantaneous efficiency was calculated as 48% when pure water was used as the working fluid, 58% for Al2O3-water nanofluid, and 64% for TiO2-water nanofluid. The instantaneous power obtained using pure water was determined as 135.66 W, 167.96 W for Al2O3-water nanofluid, and 184.03 W for TiO2-water nanofluid. The improvement in efficiency was determined as 20.8% for Al2O3-water nanofluid and 33.3% for TiO2-water nanofluid. Improvement in powers was found to be 23.8% for Al2O3-water nanofluid and 35.6% for TiO2-water nanofluid.
Highlights
Turkey is a rich country in the diversity of renewable energy sources and its current potential
Measurements in which experimental performances of heat pipe solar collectors were tested using pure water, Al2O3water, and TiO2-water nanofluid are given in Figures 8, 9, and 10
The results obtained from the experiments are given follows: (i) In the comparison of thermal performances based on the data obtained, the maximum performance was obtained from TiO2-water nanofluid followed by Al2O3-water nanofluid and pure water, respectively
Summary
Turkey is a rich country in the diversity of renewable energy sources and its current potential. Dehaj and Mohiabadi used magnesium oxide (MgO) and deionized water nanofluids as working fluids in the heat pipe solar collector They experimentally examined the effects of these nanofluids on the performance they prepared in different concentrations. Daghigh and Zandi conducted an experimental study on the use of nanofluids in heat pipe solar collectors In their study, they used water as the main fluid and CuO, TiO2, and MWCNT as nanoparticles. Çiftçi et al conducted experimental studies to determine the effect of using a nanofluid containing TiO2 in heat pipes on system improvement For this purpose, the nanoparticle used in the experiments was mixed with 2% pure water and a nanofluid was prepared by the two-step method. The performances of Al2O3-water and TiO2-water nanofluids were compared with that of pure water
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
