Daily performance of a solar dish collector

Pavlović, Saša; Stefanovic, P Velimir; Janković, Marko; Bellos, Evangelos; Vasiljevic, M Darko

doi:10.2298/tsci180124098p

Cited by 3 publications

(3 citation statements)

References 23 publications

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“…It was found that this addition reduced the thermal losses to the surroundings because of the decrease in Nusselt number. Daily performance of solar dish collector under different inlet temperature levels was studied by Pavlović et al [12 ]. Collector thermal efficiency decreased between 67.36% and 54.65% with rise in temperature from 823-523 K. In contrast to individual Brayton or Rankine cycle, the combined cycles have received great attention because of their higher thermal efficiency in the design of power plants.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of solar assisted multigenerational system using therminol VP1 based nanofluids: A comparative study

et al. 2020

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The application of the nanofluids is suggested to enhance and improve the efficiency of solar thermal power system. In the present study, three different nanofluids (Fe2O3/therminol VP1, SiO2/therminol VP1, and Cu/therminol VP1) are numerically investigated in parabolic dish solar collector that is further integrated to a combined cycle for power and hydrogen production. Heat rejects from the power cycle is also utilized to drive a single effect absorption (LiBr-water) system. Furthermore, a comprehensive energy, exergy and exergo-environmental analysis are carried out by varying several input parameters and their influence on overall energetic and exergetic efficiencies, network output and rate of hydrogen generation is assessed. The engineering equation solver is employed to conduct the parametric study. Outcomes of the study demonstrate that the SiO2/VP1 has the better characteristics among the investigated nanofluids. The overall energetic efficiency of the SiO2/VP1, Fe2O3/VP1, and Cu/VP1 is almost 38.79%, 38.74%, and 37.53%, while overall exergetic efficiency is 41.72%, 41.66%, and 40.36%, respectively at 1000 Wm-2. The exergoenvironmental impact coefficient and impact index are noticed to be reduced for all the three nanofluids as mass-flow rate increases. The hy-drogen production rate for SiO2/VP1 is maximum and has observed to be increased by increasing the ambient temperature. Increase in nanoparticles concentration also rises the exergetic efficiency but reduces the thermal conductivity of the nanofluids. Coefficient of performance is noticed to be increased with rise in evaporator temperature, whereas, it is reduced by increasing the generator temperature.

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Section: Introductionmentioning

confidence: 99%

Performance analysis of solar assisted multigenerational system using therminol VP1 based nanofluids: A comparative study

et al. 2020

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“…There are many studies which investigate alternative cavities. Daabo et al (2016) compared cylindrical, conical and spherical receivers (Pavlović et al 2019). According to their results, the conical receiver is the best case among the examined.…”

Section: Introductionmentioning

confidence: 99%

Optimizing solar dish performance using analytical flux distribution in focal region

Santoso

Antoko

Ichsani

2020

Int. J. Renew. Energy Dev.

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In this paper, thermal performance analysis of 4 m2 solar dish collector is presented.The focal image characteristics of the solar dish are determined to propose the suitable design of a receiver. A flat plate was used for the receiver to measure flux distribution in the focal region. The measurement had been done in the midday. Intercept factor based on this distribution had been calculated and was obtained to calculate thermal efficiency after total heat loss was described. From the experiment, total heat loss was formed by conductive and radiative in the receiver. The results showed that the increase in total heat loss followed the increase in receiver temperature and it caused a decrease in thermal efficiency. On the peak of the measurement or in midday, receiver temperature can achieve 138°C and it gave around 1200-Watt heat loss and it was dominated by radiative heat loss for around 80%. The thermal efficiency of the system due to flux distribution measurement in the focal region was above 70% and it was classified as high average but we needed to cover this flux up so it did not lose a lot of heat. Cavity aperture would keep around 20% total heat loss and it minimized radiative heat loss from the flux. The design of cavity aperture was the next discussion to insulate thermal heat reflection of the parabolic dish system from high radiative heat loss.©2020. CBIORE-IJRED. All rights reserved

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“…The effects of various nanofluids and geometrical parameters on the exergy efficiency of solar parabolic collectors were comprehensively discussed. The daily performance of a solar dish collector was investigated for various inlet temperatures [10]. They noted that the thermal and the exergy efficiencies were approximately constant during the daily operation.…”

Section: Introductionmentioning

confidence: 99%

Su ısıtma uygulaması için güneşi takip eden parabolik çanak toplayıcısının kullanılması.

Devecioğlu¹,

Hatipoğlu²,

Oruç³

2020

DÜMF Mühendislik Dergisi

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In this study, it is aimed to obtain hot water through a parabolic dish mirror tracking the sun in two axes in climatic conditions of Diyarbakır, Turkey. A heat exchanger with copper spiral element was designed as an absorber on the focus point of the system. Water coming from network exits from the system by heated in the absorber. The experimental data was acquired from 10:00 a.m. to 16:30 p.m. o'clock. The effect of mass flow rate on efficiency was studied considering three cases of 0.00187, 0.00217 and 0.00345 kg/s. The results indicated that the highest useful heat amount and thermal efficiency were obtained at 0.00345 kg/s. The thermal efficiency values were determined as 32 to 39%. The exergy efficiency of the system was also evaluated as 5.7 to 6.3% according to the experimental data.

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Daily performance of a solar dish collector

Cited by 3 publications

References 23 publications

Performance analysis of solar assisted multigenerational system using therminol VP1 based nanofluids: A comparative study

Performance analysis of solar assisted multigenerational system using therminol VP1 based nanofluids: A comparative study

Optimizing solar dish performance using analytical flux distribution in focal region

Su ısıtma uygulaması için güneşi takip eden parabolik çanak toplayıcısının kullanılması.

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