Performance analysis of using CuO-Methanol nanofluid in a hybrid system with concentrated air collector and vacuum tube heat pipe

Kaya, Metin O.; Gürel, Ali Etem; Ağbulut, Ümit; Ceylan, İlhan; Çelik, Selim; Ergün, Alper; Acar, Bahadır

doi:10.1016/j.enconman.2019.111936

Cited by 71 publications

(24 citation statements)

References 28 publications

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“…The increase in the nanofluid concentration provided more radiation absorption in OHP. [98] 2019 CuO-methanol Thermal properties have increased and better performance has been achieved. [99] 2019 CuO-H2O Copper oxide nanofluid and deionized water increased the productivity of the collector.…”

Section: Nanofluid Applications In Heat Pipe Solar Collectorsmentioning

confidence: 99%

“…OHPs containing nanofluids had very high thermal conductivity, and thus a serious improvement in the system was detected. Kaya et al [98] conducted studies on the energetic and exergetic analysis of a concentrated air collector with evacuated tube heat pipe at different air rates. For this purpose, CuO-methanol nanofluid was used in the study.…”

Section: Nanofluid Applications In Heat Pipe Solar Collectorsmentioning

confidence: 99%

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Güneş Kolektörlerinde Nanoakışkanların Kullanılmasının Etkileri

Ünvar

Menlik

2021

Politeknik Dergisi

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The importance of using solar energy, one of the renewable energy sources, has started to be understood more recently. The negative environmental effects and limited amounts of fossil fuels have led to increased demand for renewable energy sources worldwide and the production of various models and devices has accelerated to take advantage of solar energy, which is the basis of all energy sources. Using solar collectors as a way to benefit from solar energy has been used for many years. Although solar collectors are generally divided into 4 types as flat plate (FPSC), evacuated tube (ETSC), parabolic (PSC) and heat pipe (HPSC), these types can also be divided into separate types with many different features. The most commonly used solar collector type in the world is Flat Plate Solar Collector. The most important reasons for this are being cheap, easily produced and applied in various ways. Yet, the thermal productivity of FPSCs decreases below 40% in non-ideal climate conditions with low surrounding temperature. The existence of such disadvantages of FPSCs led to the production of Evacuated Tube Solar Collectors. With the advancing technology, the utilization of heat pipes in collectors has come to the agenda and as a result of the studies conducted, it has been determined that the use of heat pipe improves efficiency. In addition, the use of nanofluids in solar collectors and heat pipes has become quite common, and many studies have been carried out especially on this subject recently. The primary objective is always to improve the performance of the system and achieve efficiency. In this way, solar energy will be used in the most effective way and world energy supply demand will be met by using renewable resources.

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Section: Nanofluid Applications In Heat Pipe Solar Collectorsmentioning

confidence: 99%

Section: Nanofluid Applications In Heat Pipe Solar Collectorsmentioning

confidence: 99%

Güneş Kolektörlerinde Nanoakışkanların Kullanılmasının Etkileri

Ünvar

Menlik

2021

Politeknik Dergisi

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“…The Al 2 O 3 -water and TiO 2 -water nanofluids were prepared using the two-step method. In this regard, the particles with the size of 20 nm were dispersed in distilled water and placed in the ultrasonic bath (vCLEAN-L27, 500 W, Backer Viera Trading Company, Iran) about 4 h at 40 kHz frequency to be stabilized properly [34,35]. All the suspensions were poured into test containers and allowed to deposit for a few days.…”

Section: Nanofluid Preparationmentioning

confidence: 99%

Experimental investigation of heat transfer and pressure drop in a minichannel heat sink using Al2O3 and TiO2–water nanofluids

Moghanlou

Noorzadeh

Ataei

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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Nanofluids are known as a new generation of coolants. These fluids have attracted more attention in cooling applications, like electrical, optical, and solar systems recently, because of their unique rheological and thermal properties. In the present study, to evaluate the thermal behavior of the nanofluids, Al 2 O 3 and TiO 2 nanoparticles with the size of 20 nm were completely dispersed in distilled water and circulated in a minichannel heat sink. The heat sink consists of 10 minichannels that have designed to cool thermoelectric generators. The results showed that by only dispersion of 0.5 vol% Al 2 O 3 nanoparticles a 9.30% heat transfer enhancement observed. It was also obtained that the TiO 2-water sample showed a 4.56% heat transfer enhancement. The highest efficiency was obtained by utilizing the Al 2 O 3-water nanofluid. This was attributed to the higher thermal conductivity of Al 2 O 3 compared to TiO 2. Using both nanofluids resulted in higher pressure drop compared to the based fluid. At the Reynolds number of 1000, the pressure drop for Al 2 O 3 and TiO 2 nanofluids increased as 3.33% and 3.88%, respectively. The increased pressure drop was attributed to higher density and viscosity of nanofluids. The classical theories are not available to justify the remarkable heat transfer enhancement obtained by adding a negligible amount of mentioned nanoparticles. It seems that new mechanisms such as the random motion of nanoparticles and generated microconvections by nanoparticle motion in the base fluid are responsible for considerable heat transfer enhancement.

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“…The area ratio was calculated by dividing the top area of the concentrator by the bottom area of the concentrator, which is the same as the PV module surface area. 33,34 AR =…”

Section: Fares and Bicer 26mentioning

confidence: 99%

Performance assessment of a novel design concentrated photovoltaic system coupled with self‐cleaning and cooling processes

Acar

Gürel

Ergün

et al. 2020

Env Prog and Sustain Energy

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The generation of electrical energy with photovoltaic modules is a highly useful and environmentally friendly method. For this reason, studies to increase the electrical energy production from photovoltaic (PV) modules have gained great importance. Concentrated PV systems constitute a significant part of these studies. The major problems with the concentrated PV systems are the risks of lowering the efficiency of the cells (i.e., concentration process increases PV cell temperature) and the thermal damage that can occur with sudden temperature increases. In order to avoid these risks, various applications are used to cool concentrated PV modules. In this study, an active system, which was developed for cleaning and cooling PV modules, was tested. The aim of the present study was to ensure that the surfaces were clean and free of external, contaminating factors such as dust and dirt, and that the PV cells were cooled. During the experiments, two different systems were compared: the system with the cleaning‐cooling processes and the one without these processes. Prior to starting experiments, a hydrophobic liquid onto the surfaces of the PV modules was applied to facilitate the cleaning process. The results of the experiments revealed that the temperature of the PV module was 50°C in the cleaning‐cooling process and 67°C in the system without the cleaning‐cooling process. On the other hand, it was observed that the proposed design increased the power output of PV module up to 40%.

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Performance analysis of using CuO-Methanol nanofluid in a hybrid system with concentrated air collector and vacuum tube heat pipe

Cited by 71 publications

References 28 publications

Güneş Kolektörlerinde Nanoakışkanların Kullanılmasının Etkileri

Güneş Kolektörlerinde Nanoakışkanların Kullanılmasının Etkileri

Experimental investigation of heat transfer and pressure drop in a minichannel heat sink using Al2O3 and TiO2–water nanofluids

Performance assessment of a novel design concentrated photovoltaic system coupled with self‐cleaning and cooling processes

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