Analytical model for the design of volumetric solar flow receivers

Veeraragavan, Ananthanarayanan; Lenert, Andrej; Yilbaş, Bekir Sami; Al‐Dini, Salem A.; Wang, Evelyn N.

doi:10.1016/j.ijheatmasstransfer.2011.11.001

Cited by 105 publications

(76 citation statements)

References 12 publications

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“…Thus, the analysis is not applicable to high-temperature NDASCs. However, we note that for temperatures less than 750 K radiative emission constitutes a small fraction of the total radiative heat loss [34].…”

Section: Introductionmentioning

confidence: 73%

“…Thus, reduced models are typically used to study the qualitative behaviour of NDASCs. Veeraragavan et al [34] derived an analytical solution via the method of eigenfunction expansions by excluding the effect of scattering due to the nanoparticles. In addition, they assumed constant nanoparticle optical properties and a non-absorbing base fluid.…”

Section: Introductionmentioning

confidence: 99%

“…Firstly, as in the case of previous studies [25,31,33,34], we presume a constant fluid velocity profile in the collector. We examine low particle volume fractions because if the particles are packed too close together, dependent and multiple scattering effects must be considered.…”

Section: Introductionmentioning

confidence: 99%

“…The system parameters, and in particular the nanoparticle volume fraction, are then varied in the model to study their influence on collector performance. The main advantage of our method is that, unlike previous analytical studies [17,34], all of the wavelength-dependent optical properties are retained in the integral. Assuming constant optical properties is not always valid.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Modelling the efficiency of a nanofluid direct absorption solar collector

Cregan

Myers

2015

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modelling the efficiency of a nanofluid direct absorption solar collector

Cregan

Myers

2015

International Journal of Heat and Mass Transfer

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“…Firstly, in conventional flat-plate collectors, nanofluid improves thermo-physical properties of fluid which is investigated in many studies (Moraveji and Razvarz, 2012;Mahmoodi and Hashemi, 2012;Ghadimi et al, 2011;Peyghambarzadeh et al, 2011;Ramesh and KotekarPrabhu, 2011;Roy et al, 2012). Secondly, in direct absorption solar collectors, which solar energy is directly absorbed with in the fluid volume, nanofluid enhances solar incident absorption drastically (Khullar et al, 2013;Lenert and Wang, 2012;Veeraragavan et al, 2012;Taylor et al, 2012). Tiwari et al (2013) theoretically demonstrated the enhancement of collector efficiency by using nanofluid as working fluid in flat-plate collector and the potential of reducing 31% in CO 2 emission in comparison with the conventional models.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Nanoparticle Shape Effect on a Nanofluid Based Flat-Plate Solar Collector Efficiency

Amin

Ghasempour

Fatemeh

et al. 2015

Energy Exploration & Exploitation

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Solar thermal energy is a very convenient source of heating which is environmentally benign. Solar collectors convert solar radiation into heat and transfer the heat to a medium. Flat-plate solar collectors are the most common and cost effective devices for exploiting solar energy. However, these systems have relatively low efficiency due to the poor thermo-physical properties of working fluid. Dispersing of nanometer sized particles into the base fluid is proposed as an efficient method to improve heat transfer properties of the working fluid. In order to evaluate the thermal performance of nanofluid in a solar collector, firstly, it is essential to understand the thermo-physical variations of base fluid through addition of nanoparticles. Thermo-physical properties of base fluid vary with parameters such as particle concentration, particle diameter, and particle shape. In this study the effect of these parameters are explored on thermal performance of a flat-plate solar collector theoretically. Investigating shape effect of particles on collector efficiency is a highlight in this study. It is observed that increasing nanoparticles volumetric concentration leads to enhancenement in flat-plate collector efficiency. Reversely, particle size enhancement reduces the efficiency. In addition, particle shape affects collector efficiency. For different shapes of particles, including spherical, brick, cylinders, platelets, and blades, the blade shape particles relatively have the highest efficiency.

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Thermal characteristics of a volumetric solar absorption system

Siddiqui

Yilbaş

2013

Int. J. Energy Res.

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SUMMARYSolar volumetric heating is one of the alternative clean energy applications, and the improvement of thermal storage capacity of the system is necessary for the efficient applications. Consequently, volumetric solar absorption flow system incorporating the absorber plate in the channel was investigated for different Reynolds numbers and solar concentrations. The influence of the location of the absorbing plate on the heat transfer and hydrodynamic losses was also examined in the channel. In order to increase the thermal storage capacity of the working fluid, phase change materials of 7% concentration was incorporated in the analysis. Lauric acid was used as phase change materials, and water was considered as the carrier fluid in the channel. The performance and pump power loss parameters were introduced to assess the thermal performance of the volumetric solar absorption system. It is found that the performance parameter attained the highest value for the absorber plate location at the top of the channel, which was about 10% higher than those corresponding to the other locations. This was more pronounced with increasing Reynolds number and solar concentration. The pump power loss parameter was the highest for the absorber plate location at the mid-height of the channel.

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Analytical model for the design of volumetric solar flow receivers

Cited by 105 publications

References 12 publications

Modelling the efficiency of a nanofluid direct absorption solar collector

Modelling the efficiency of a nanofluid direct absorption solar collector

Evaluation of Nanoparticle Shape Effect on a Nanofluid Based Flat-Plate Solar Collector Efficiency

Thermal characteristics of a volumetric solar absorption system

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