Numerical simulation of parabolic trough solar collector: Improvement using counter flow concentric circular heat exchangers

Garcı́a-Valladares, O.; Velázquez, N.

doi:10.1016/j.ijheatmasstransfer.2008.08.004

Cited by 164 publications

(48 citation statements)

References 14 publications

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“…With this, the receiver is assumed to be surrounded by a large enclosure, the sky. The transfer of energy by radiation between the glass cover and the sky is given by the Stefan-Boltzmann law with the sky temperature given by [62] 1.5…”

Section: Other Flow and Thermal Boundary Conditionsmentioning

confidence: 99%

Thermal performance and entropy generation analysis of a high concentration ratio parabolic trough solar collector with Cu-Therminol®VP-1 nanofluid

Mwesigye

Huan

Meyer

2016

Energy Conversion and Management

199

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This paper presents results of a numerical study on the thermal and thermodynamic performance of a high concentration ratio parabolic trough solar collector using Cu- Above a certain Reynolds number, further increase in the Reynolds numbers makes the entropy generation higher than that of a receiver with only the base fluid. Key wordsConcentration ratio, entropy generation, nanofluid, parabolic trough receiver, thermal efficiency. †

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Section: Other Flow and Thermal Boundary Conditionsmentioning

confidence: 99%

Thermal performance and entropy generation analysis of a high concentration ratio parabolic trough solar collector with Cu-Therminol®VP-1 nanofluid

Mwesigye

Huan

Meyer

2016

Energy Conversion and Management

199

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“…Convection heat transfer from the glass cover to the surroundings was modelled by specifying a convection heat transfer coefficient and fluid temperature. The sky temperature is given by T sky = 0.0552T amb 1.5 [35] while the wind heat transfer coefficient is given by h w = Vw 0.58 d go -0.42 [36]. A part from the validation cases where actual experimental conditions were used, the environmental conditions used in this study are shown in Table 1.…”

Section: Boundary Conditionsmentioning

confidence: 99%

Minimum entropy generation due to heat transfer and fluid friction in a parabolic trough receiver with non-uniform heat flux at different rim angles and concentration ratios

Mwesigye

Bello‐Ochende

2014

Energy

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In this paper, Monte Carlo ray-tracing and computational fluid dynamics are used to numerically investigate the minimum entropy generation due to heat transfer and fluid friction in a parabolic trough receiver. The analysis was carried out for rim angles in the range 40 o -120 o , concentration ratios in the range 57-143, Reynolds numbers in the range 1.02×10 4 -1.36 ×10 6 and fluid temperatures in the range 350 -650K. Results show existence of an optimal Reynolds number at any given combination of fluid temperature, concentration ratio and rim angle for which the total entropy generation is a minimum. The total entropy generation was found to increase as the rim angle reduced, concentration ratio increased and fluid temperature reduced. The high entropy generation rates at low rim angles are mainly due to high peak temperatures in the absorber tube at these low rim angles. Keywords:

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“…al. [7] studied by numerical simulation the parabolic trough solar collector using counter flow concentric circular heat exchangers, where for each studied case; the solar radiation, the ambient temperature, and wind speed were kept constant for each case. Ming et.…”

Section: Fig 1: Parabolic Trough Collector Systemmentioning

confidence: 99%

Hourly Simulation of Parabolic Trough Solar Collector with Simultaneous Solar Radiation and Weather Conditions during Sunshine Period in Cairo-Egypt

Kotb¹

2013

IOSRJEN

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Abstract:The present work is an attempt to simulate the single-pass parabolic trough collector from thermal and optical point of view, considering the simultaneous hourly profiles of solar radiation, ambient dry-bulb temperature, and wind speed during the sunshine period for specific geographical location. Also, computer program is constructed and presented as simulator to predict the performance of the parabolic trough collector with varying operating, design, and weather conditions. For the studied case, the results are; the maximum reflected solar radiation from the mirror surface is 20849.0 W/m 2 at hour 12 and distributed as; 65.8 % and 1.53 % absorbed by the absorber, cover tubes respectively while 32.67 % is dissipated as heat loss to the surrounding environment. For 0.001 kg/s of heat transfer fluid, results showed that; the temperature of the absorber tube is 597.0 o C at hour 12, while the heat transfer fluid is 539.0 o C at hour 13.30 and the cover tube is 258.6 o C at hour 11.097. It is noted that; after hour 14.317 and beyond the heat transfer from the absorber tube to the heat transfer fluid reverses its direction, while at the sunshine end, the temperatures are 342.0 o C for heat transfer fluid, 204.0 o C for the absorber tube, and 50.2 o C for the cover tube at the exit section.

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Numerical simulation of parabolic trough solar collector: Improvement using counter flow concentric circular heat exchangers

Cited by 164 publications

References 14 publications

Thermal performance and entropy generation analysis of a high concentration ratio parabolic trough solar collector with Cu-Therminol®VP-1 nanofluid

Thermal performance and entropy generation analysis of a high concentration ratio parabolic trough solar collector with Cu-Therminol®VP-1 nanofluid

Minimum entropy generation due to heat transfer and fluid friction in a parabolic trough receiver with non-uniform heat flux at different rim angles and concentration ratios

Hourly Simulation of Parabolic Trough Solar Collector with Simultaneous Solar Radiation and Weather Conditions during Sunshine Period in Cairo-Egypt

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