Exergy analysis of parabolic trough solar collectors using Al2O3/synthetic oil nanofluid

Khakrah, Hamidreza; Shamloo, Amir; Hannani, Siamak Kazemzadeh

doi:10.1016/j.solener.2018.08.064

Cited by 60 publications

(23 citation statements)

References 23 publications

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“…This paper shows how the exergy efficiency of a typical PTC system can vary if receiver tube design and size is varied on different rim angles. Exergetic efficiency is defined as the ratio of exergy gain to the exergy of input solar radiation (Allouhi et al 2018); (Chandra et al 2017); (Khakrah et al 2018). It is represented in the form of an equation below:…”

Section: Exergy Analysismentioning

confidence: 99%

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Thermal and Geometrical Assessment of Parabolic Trough Collector Mounted Double Evacuated Novel Receiver Tube System

Thappa

Chauhan

Anand

et al. 2021

Preprint

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This paper particularly aims to highlight the necessity of optimal geometric design considerations of a parabolic trough collector (PTC) mounted novel receiver tube in view of efficient operation and high-end performance. Many investigations, analysis, and validation have been done in this regard as solar energy based PTC now a commercially mature technology acknowledges a variety of role in the form of power generation and other thermal applications. This article identifies the optimal rim angle corresponding to its tube size as required for high exergetic gains. Almost six receiver tubes, distinct in terms of dimensions and number of covers are compared for their best results to be mounted on adequate geometry with different rim angle (40°, 80°, and 120°). A significant variation of flow rate (i.e. 16 to 216 litre/hr) and inlet fluid temperature (i.e. 323 K, 423 K, 523 K, 623 K, and 723 K) has been extensively detailed about high energy and exergy retrieval from the system. The study reports that all the favorable results are found with the receiver tube having a diameter of 0.027 m and a double envelope, compared to other design considerations. Results show that as the flow rate increases energy efficiency also increases up to some extent along with increasing receiver tube temperature. The highest energy and exergy efficiency as reported to be 79.4% and 47% respectively with 80o being the optimal rim angle for a 5.7 m wide parabolic aperture.

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Section: Exergy Analysismentioning

confidence: 99%

“…standard LS-3 type design because many researchers have investigated PTC systems having almost similar dimensions as stated in this article. Researchers like(Allouhi et al 2018;Khakrah et al 2018;Allouhi et al 2018)(Khakrah et al 2018)(Bellos et al 2017) &(Reddy et al 2012) have studied PTC system with similar dimensions in terms of aperture width and length.…”

mentioning

confidence: 99%

Thermal and Geometrical Assessment of Parabolic Trough Collector Mounted Double Evacuated Novel Receiver Tube System

Thappa

Chauhan

Anand

et al. 2021

Preprint

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“…The performance evaluation criterion (PEC) is utilized for the thermal and fluid performances of solar heat exchanger with nanofluid to estimate the real heat transfer improvement. It is determined employing the calculated friction factor and Nusselt numbers as follows [61,62]:…”

Section: Governing Equationsmentioning

confidence: 99%

“…G k,m = t,m ∇ ⃗ U m + ∇ ⃗ U m T .some useful interested parameters are written as follows. Reynolds number of fluid flow is defined as[61,62]:…”

mentioning

confidence: 99%

Two-phase nanofluid flow simulation with different nanoparticle morphologies in a novel parabolic trough solar collector equipped with acentric absorber tube and insulator roof

Arani

Monfaredi

2020

J Braz. Soc. Mech. Sci. Eng.

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The main objective of the present work is to investigate the morphology effects of Syltherm 800 oil-based γ-AlOOH nanofluid on performance evaluation criterion (PEC) and energy efficiency of a novel parabolic trough solar collector (PTSC) numerically using finite volume method. The other goal is to compare the obtained results of nanofluid simulation in PTSC using single-phase mixture model (SPM) with two-phase mixture model (TPM). In addition, influences of using acentric absorber tube are determined. Consequently, in this step the optimum configuration is introduced and then different nanofluids characteristics such as volume fractions, nanoparticles diameters and shapes on the optimum configuration are investigated. Based on the obtained results, for all studied cases, obtained PEC and energy efficiencies employing the TPM in nanofluid simulation are more than that SPM simulation. Using the novel PTSC leads to the higher average Nusselt number, energy efficiency, PEC and outlet temperature at all Reynolds numbers. For all cases, the PEC and energy efficiency increase by reduction of nanoparticle volume fraction and diameter. As the Reynolds number increases, the energy efficiency of PTSC increases for all studied cases till Reynolds number equal to 5000 and then always reduces. Therefore, the optimum Reynolds number is 5000. The optimum morphology is related to the nanoparticles shape of blade which is followed by the brick, cylinders and platelet, respectively.

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“…Thus, it is given constant and extensive attention in the literature. Many studies were devoted to PTC efficiency improvement [9], both experimentally and numerically [10]. The literature also offers a vast number of results for experimental and theoretical computational testing carried out in the range of optical [11] and thermal parameters of the collectors [12].…”

Section: Introductionmentioning

confidence: 99%

Mathematical Model of a Sun-Tracked Parabolic Trough Collector and Its Verification

2020

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The paper presents a one-dimensional distributed parameter model for simulating the transient-state operation of a parabolic trough collector (PTC). The analyzed solar collector has a module design and is equipped with a two-axis sun-tracking system to increase the solar energy yield. The single module is composed of an evacuated tube and a set of parabolic mirrors acting as reflectors. In each of the collector tubes, two aluminum U-tubes are installed, enabling heat intake by the solar fluid. The collector is intended for household applications, as well as other medium thermal energy demand uses. During the numerical model development, appropriate energy balance differential equations are formulated for the collector individual components. The equations are solved using different schemes. As a result, a time- and space-dependent temperature series for each of the collector components and the working fluid are obtained. To select an appropriate time and spatial steps for the developed model and to verify the reliability of the results received, the collector model is also implemented in ANSYS Fluent. The results of the one-dimensional model calculations and comparisons carried out in ANSYS demonstrate considerable agreement. In particular, the values of the fluid temperature at the collector outlet, calculated using the model developed, show high consistency with the ANSYS Fluent results. Furthermore, a preliminary experimental verification of the proposed model is carried out on a test stand currently under construction. The computed and measured temperature course of the fluid at the collector outlet is compared. In this case, the results are also satisfactory.

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Exergy analysis of parabolic trough solar collectors using Al2O3/synthetic oil nanofluid

Cited by 60 publications

References 23 publications

Thermal and Geometrical Assessment of Parabolic Trough Collector Mounted Double Evacuated Novel Receiver Tube System

Thermal and Geometrical Assessment of Parabolic Trough Collector Mounted Double Evacuated Novel Receiver Tube System

Two-phase nanofluid flow simulation with different nanoparticle morphologies in a novel parabolic trough solar collector equipped with acentric absorber tube and insulator roof

Mathematical Model of a Sun-Tracked Parabolic Trough Collector and Its Verification

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