Parabolic-trough solar collectors and their applications

Fernández-García, Aranzazú; Zarza, Eduardo; Valenzuela, Loreto; García, Manuel Pérez

doi:10.1016/j.rser.2010.03.012

Cited by 933 publications

(321 citation statements)

References 88 publications

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“…Two commercial PTC are selected, recommended for applications up to 250 • C [24], for whom the numerical data given in Table 3 were employed. For the glass and tube properties, in both cases, the following values have been used: α gls = 0.02, [26] function on pipe interior wall temperature T pi .…”

Section: Parabolic Trough Collectormentioning

confidence: 99%

Maximum Exergetic Efficiency Operation of a Solar Powered H2O-LiBr Absorption Cooling System

Stanciu

Gheorghian

et al. 2017

Entropy

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Abstract:A solar driven cooling system consisting of a single effect H 2 O-LiBr absorbtion cooling module (ACS), a parabolic trough collector (PTC), and a storage tank (ST) module is analyzed during one full day operation. The pressurized water is used to transfer heat from PTC to ST and to feed the ACS desorber. The system is constrained to operate at the maximum ACS exergetic efficiency, under a time dependent cooling load computed on 15 July for a one storey house located near Bucharest, Romania. To set up the solar assembly, two commercial PTCs were selected, namely PT1-IST and PTC 1800 Solitem, and a single unit ST was initially considered. The mathematical model, relying on the energy balance equations, was coded under Engineering Equation Solver (EES) environment. The solar data were obtained from the Meteonorm database. The numerical simulations proved that the system cannot cover the imposed cooling load all day long, due to the large variation of water temperature inside the ST. By splitting the ST into two units, the results revealed that the PT1-IST collector only drives the ACS between 9 am and 4:30 pm, while the PTC 1800 one covers the entire cooling period (9 am-6 pm) for optimum ST capacities of 90 kg/90 kg and 90 kg/140 kg, respectively.

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Section: Parabolic Trough Collectormentioning

confidence: 99%

Maximum Exergetic Efficiency Operation of a Solar Powered H2O-LiBr Absorption Cooling System

Stanciu

Gheorghian

et al. 2017

Entropy

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“…The outer surface of the solar receiver tube is coated with solar selective materials to absorb that concentrated sunlight and also any sunlight that falls directly on the tube itself. All the collected radiation is then converted into thermal energy [2,3]. One important task is the development of a solar selective absorber to achieve high solar absorptance (α) or low reflectance (R) over the whole range of the solar spectrum (300-2500 nm) and low emittance (ε) of long wavelength infrared (IR) radiation at 2.5-20 μm [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Influence of Ni–Al coating thickness on spectral selectivity and thermal performance of parabolic trough collector

Suriwong

Bunmephiphit

Wamae

et al. 2018

Mater Renew Sustain Energy

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This study investigates the influence of Ni-Al coating thickness on the spectral selectivity and thermal performance of a parabolic trough collector (PTC). Three thicknesses of Ni-Al coating for use as solar absorber material were successfully prepared on the outer surface of a stainless steel 316L (SS) tube by flame spray. The phase, morphology, and reflectance (R) of the Ni-Al coatings were characterized using several techniques. The PTC and solar receiver tube were specially designed and constructed for observing the collector thermal performance by following ASHRAE . Looking at the results, the actual average thicknesses of the three Ni-Al coatings turn out to be 195, 215, and 299 μm. The morphology and chemical composition of all three thicknesses are similar. The chemical composition in the cross-sectional view exhibits non-uniform distribution. The three thicknesses of the coating are composed of NiO and Al 2 O 3 phases, which also corresponded to the results of SEM-EDX mapping. The differences in a solar absorptance (α) of the three thicknesses of Ni-Al coating are not statistically significant, with an average α value of 0.74-0.75. However, there are differences in thermal efficiency of the PTC depending on the thickness of the Ni-Al coating. Of the three samples, the thickest one (299 µm) demonstrates the highest ability to convert solar radiation into thermal energy.

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“…Spain's experience highlights that appropriate site locations are important to get the maximum performance out of CST technology. CSP plants works with high efficiency in arid to semi-arid region where direct normal irradiance (DNI), is typically above 2000 kWh/m 2 [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

An investigation on factors influencing dust accumulation on CSP mirrors

Pennetta¹,

Yu²,

Borghesani³

et al. 2016

AIP Conference Proceedings

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Abstract..The profitability of a CSP plant is highly affected by the efficiency of the solar field: it is essential to maintain mirrors' reflectivity at high level to avoid thermal power loss. Dust fouling is the main cause of reflectivity loss and cleaning of mirrors is a crucial activity to restore economical level of reflectivity. However, the high cost of cleaning operations requires the study and identification of a balanced plan for the dust removal. The dust generation and transport to the plant site is the first mechanism that needs to be modelled to identify the optimal schedule for cleaning operations and it is highly dependent on weather conditions. Several studies have suggested a dependency of reflectors performance with humidity level, frequency of rainfalls, wind and mirrors' tilting angle, however rarely quantitative correlation studies have been performed to validate these hypotheses. The aim of this research is to provide an in-depth insight on interaction between the main parameters and airborne dust concentration, providing quantitative information for the development of future mirror dusting models. Outcomes evidence the crucial role of high winds responsible of dust concentration in conjunction with higher wind direction frequencies in the range 60-120°. Actually, in this scenario a perfectly monotonic increase of dust accumulation in the air has been observed with high correspondence of wind direction. A very low effect is provided by the ambient temperature as the contribution of the barometric pressure.

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Parabolic-trough solar collectors and their applications

Cited by 933 publications

References 88 publications

Maximum Exergetic Efficiency Operation of a Solar Powered H2O-LiBr Absorption Cooling System

Maximum Exergetic Efficiency Operation of a Solar Powered H2O-LiBr Absorption Cooling System

Influence of Ni–Al coating thickness on spectral selectivity and thermal performance of parabolic trough collector

An investigation on factors influencing dust accumulation on CSP mirrors

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