Browsing by Author "Gurbuz, Emine Yagiz"

Now showing 1 - 2 of 2

A Comprehensive Survey on Utilization of Hybrid Nanofluid in Plate Heat Exchanger with Various Number of Plates
(Emerald Group Publishing Ltd, 2022) Afshari, Faraz; Tuncer, Azim Dogus; Sozen, Adnan; Variyenli, Halil Ibrahim; Khanlari, Ataollah; Gurbuz, Emine Yagiz
Purpose Using suspended nanoparticles in the base fluid is known as one of the most efficient ways for heat transfer augmentation and improving the thermal efficiency of various heat exchangers. Different types of nanofluids are available and used in different applications. The main purpose of this study is to investigate the effects of using hybrid nanofluid and number of plates on the performance of plate heat exchanger. In this study, TiO2/water single nanofluid and TiO2-Al2O3/water hybrid nanofluid with 1% particle weight ratio have been used to prepare hybrid nanofluid to use in plate type heat exchangers with three various number of plates including 8, 12 and 16. Design/methodology/approach The experiments have been conducted with the aim of examining the impact of plates number and used nanofluids on heat transfer enhancement. The performance tests have been done at 40 degrees C, 45 degrees C, 50 degrees C and 55 degrees C set outlet temperatures and in five various Reynolds numbers between 1,600 and 3,800. Also, numerical simulation has been applied to verify the heat and flow behavior inside the heat exchangers. Findings The results indicated that using both nanofluids raised the thermal performance of all tested exchangers which have a various number of plates. While the major outcomes of this study showed that TiO2-Al2O3/water hybrid nanofluid has priority when compared to TiO2/water single type nanofluid. Utilization of TiO2-Al2O3/water nanofluid led to obtaining an average improvement of 7.5%, 9.6% and 12.3% in heat transfer of heat exchangers with 8, 12 and 16 plates, respectively. Originality/value In the present work, experimental and numerical analyzes have been conducted to investigate the influence of using TiO2-Al2O3/water hybrid nanofluid in various plate heat exchangers. The attained findings showed successful utilization of TiO2-Al2O3/water nanofluid. Based on the obtained results increasing the number of plates in the heat exchanger caused to obtain more increment by using both types of nanofluids.
Numerical and Experimental Analysis of Longitudinal Tubular Solar Air Heaters Made from Plastic and Metal Waste Materials
(Begell House Inc, 2021) Khanlari, Ataollah; Sozen, Adnan; Tuncer, Azim Dogus; Afshari, Faraz; Gurbuz, Emine Yagiz; Bilge, Yasar Can
Recycling and reusing waste materials not only reduces environmental pollution but also contributes to the reduction of health problems and economic gain. In this study, plastic and metal materials reused in fabricating solar air heaters (SAHs) are considered. Accordingly, two tubular solar air heaters have been designed, fabricated, and experimented. The major objective of this work is to demonstrate the importance of utilizing waste materials in renewable energy-based technologies and their applicability in thermal energy production. In the first step of the analysis, the applicability of tubular-type SAHs has been studied numerically. The experiments have been conducted at two tilt angles including 90 degrees and 32 degrees and also at three flow rates including 0.012, 0.010, and 0.008 kg/s. The experimental findings showed that the efficiency of metal SAH and plastic SAH varied in the range of 36.33-50.96% and 31.60-47.06%, respectively. Also, enviro-economic costs for metal and plastic SAH were achieved as 8.02 and 7.55 $/year. Besides, the experimental results were predicted with ANN and SVM algorithms. The prediction success of the algorithms is discussed with four metrics (R-2, MAPE, RMSE, and MBE). The outcomes clearly demonstrate the successful application of this simple and cost-effective tubular-type SAH manufactured from waste materials.