COMPARISON BETWEEN HEAT TRANSFER CHARACTERISTICS OF TiO2/DEIONIZED WATER AND KAOLIN/DEIONIZED WATER NANOFLUIDS IN THE PLATE HEAT EXCHANGER

Khanları, Ataollah; Sözen, Adnan; Variyenli, Halil İbrahim; Gürü, Metin

doi:10.1615/heattransres.2018026288

Cited by 41 publications

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“…Obtained heat transfer rate in this research varied in the range of 7102-19.532 W. In a study done by Ozdemir and Ergun [5], Al 2 O 3 /water nanofluid was experimentally tested in PHE with 16 plates and achieved heat transfer rate between 3000 and 14,000 W. In another study conducted by Variyenli [3], the performance of using fly ash nanofluid in PHE with 16 plates was analyzed and heat transfer rate obtained was 2500-10,800 W. Also, Khanlari et al [2] experimentally tested TiO 2 /water and Kaolin/ water nanofluids in PHE and found heat transfer rate in the range of 5000-20,000 W. Figure 7 demonstrates the variation in OHTC with respect to Reynolds number in PHE with eight plates. Hybrid nanofluid utilization in this HE increased the OHTC averagely as 10.5%.…”

Section: Experimental Findingsmentioning

confidence: 99%

“…The obtained effectiveness of PHE in this study varied in the range of 0.69-0.92. Khanlari et al [2] experimentally tested TiO 2 /water and kaolin/water nanofluids and found effectiveness between 0.7 and 0.91. Bhattad et al [30] conducted a study on a PHE with Al 2 O 3 + MWCNT/water and obtained effectiveness between 0.45 and 0.75.…”

Section: Experimental Findingsmentioning

confidence: 99%

“…Plate shape, plate thickness and channel geometry are the major parameters that affect the efficiency of PHE [1]. There are lots of studies available that analyzed the effects of various factors on thermal behavior of PHE [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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A comparative study on utilizing hybrid-type nanofluid in plate heat exchangers with different number of plates

Gürbüz

Sözen

Variyenli

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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Different methods have been utilized to enhance the thermal efficiency of the heat exchangers (HEs). A widely used method to upgrade the thermal efficiency of HEs is upgrading the thermal properties of working fluid by utilizing nanoparticles. In this study, Al 2 O 3 and CuO have been utilized to prepare Al 2 O 3-CuO/water hybrid nanofluid. Accordingly, Al 2 O 3 and CuO nanoparticles have been mixed into the water with 1% (50:50) weight concentration. The main objective of this work is testing the prepared hybrid nanofluid in plate-type HEs (PHEs) with 8, 12 and 16 plates to determine the influence of number of plates on heat transfer improvement by hybrid nanofluid. Experimental findings of the present study demonstrated that utilizing Al 2 O 3-CuO/water hybrid-type nanofluid in the PHE enhanced thermal efficiency notably in comparison with singletype nanofluids. Using this hybrid nanofluid increased the thermal performance in all PHEs with different number of plates. However, it is observed that increasing number of plates led to more increment in thermal performance by utilizing hybrid nanofluid. The highest increment in overall heat transfer coefficient was obtained as 12%, 19% and 20% in PHEs with eight, 12 and 16 plates, respectively. In addition, the highest enhancement in effectiveness was achieved as 10%, 11.7% and 16% in PHEs with eight, 12 and 16 plates, respectively. Keywords Plate heat exchanger • Hybrid nanofluid • Al 2 O 3-CuO/water • Performance List of symbols A Total heat transfer area (m 2) C Heat capacity rate (W/K) c p Specific heat capacity (J/kg K) D h Hydraulic diameter (m) f Friction factor

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Section: Experimental Findingsmentioning

confidence: 99%

Section: Experimental Findingsmentioning

confidence: 99%

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A comparative study on utilizing hybrid-type nanofluid in plate heat exchangers with different number of plates

Gürbüz

Sözen

Variyenli

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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“…Kumar et al 25 experimentally and numerically found that the heat transfer coefficient increases when there is an increase in the nanoparticle volume fractions in applications such as plate heat exchangers. Khanlari et al 26 carried out an experimental work using TiO 2 /deionized water and kaolin/deionized water nanofluids as working fluids in the plate heat exchanger. The obtained results showed that a kaolin/deionized water nanofluid had higher thermal performance than TiO 2 /deionized water nanofluid.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of photovoltaic panels using two types of nanofluids

2020

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One of the main problems that limit the extensive use of photovoltaic (PV) systems is the increase in the temperature of PV panels. Overheating of a PV module decreases the performance of the output power by 0.4% to 0.5% per 1°C over its rated temperature that in most cases is 25°C. An effective way of improving electrical performance (power output and efficiency) and reducing the rate of thermal degradation of a PV module is to reduce the operating temperature of the PV surface by a cooling medium. To achieve this, nanofluids can be considered as a potentially effective solution for cooling. In this study, two types of nanofluids, namely Al2O3 and TiO2 water‐based mixture of different volume flow rates and concentrations (0.01%, 0.05%, and 0.1%) by weight, were used. Also, three PV panels were cooled simultaneously using nanofluids, water, and natural air, respectively. Results showed that nanofluids for cooling enhanced heat transfer rate much better than water and natural air. Best results were achieved for TiO2 nanofluids at the considered concentration (0.1 wt%). Nanofluid cooling of turbulent flows for such an application has not been investigated before. These results represent the first application of nanofluid cooling in the turbulent flow regimes and in outdoor conditions including real solar irradiation.

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“…In the literature different methods were used to enhance the thermal performance of energy systems like combi boilers. Some researcher used nanofluid to improve thermal efficiency of energy systems like combi boilers and heat pipes [5][6][7][8]. Also, some researchers used turbulator in the heat exchanger with the aim of increasing thermal efficiency [9].…”

Section: Introductionmentioning

confidence: 99%

Analyzing the Environmental Effects of Conventional and Condensing Combi Boilers Using Natural Gas

Variyenli

Khanları

2020

Politeknik Dergisi

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COMPARISON BETWEEN HEAT TRANSFER CHARACTERISTICS OF TiO2/DEIONIZED WATER AND KAOLIN/DEIONIZED WATER NANOFLUIDS IN THE PLATE HEAT EXCHANGER

Cited by 41 publications

References 0 publications

A comparative study on utilizing hybrid-type nanofluid in plate heat exchangers with different number of plates

A comparative study on utilizing hybrid-type nanofluid in plate heat exchangers with different number of plates

Performance enhancement of photovoltaic panels using two types of nanofluids

Analyzing the Environmental Effects of Conventional and Condensing Combi Boilers Using Natural Gas

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