Theoretical Investigation of a Solar Air Heater Roughened by Ribs and Grooves

Yıldırım, Cihan

doi:10.18186/journal-of-thermal-engineering.365713

Cited by 13 publications

(8 citation statements)

References 19 publications

(21 reference statements)

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“…Reynolds-averaged Navier-Stokes (RANS) equations have been used to analyze the thermal performance of the receiver in FVM in the present study. Those are time averaged equations of turbulent flow for the conservation of mass, momentum, and energy given in Mwesigye et al [16,52]. Reynolds stresses have been calculated by using realizable eddy viscosity model.…”

Section: Governing Equationsmentioning

confidence: 99%

Performance Evaluation of Parabolic Trough Collector With Receiver Position Error

Donga

Kumar

2021

Journal of Thermal Engineering

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In the present study, the effect of receiver position error on the optical and thermal performance of a parabolic trough collector (PTC) has been studied. Optical analysis of the PTC has been carried out by using Monte Carlo ray tracing (MCRT) method. The solar heat flux profile obtained from the optical analysis is coupled with the finite volume method (FVM) to study the thermal performance of the PTC. Simulations have been done for experimental SEGS LS2 solar collector used in Sandia National Laboratories. Syltherm 800 has been considered as heat transfer fluid (HTF). Receiver position errors in two directions i.e. along optical axis and lateral direction, have been taken. Results show that the receiver position error substantially influences the solar heat flux distribution and hence the temperature distribution on the absorber tube. The maximum circumferential temperature difference over the absorber tube increases up to by 199.7 K with receiver dislocation along the optical axis. The effects of the receiver position error on the optical efficiency and collector efficiency have also been studied. A maximum drop of 32% in the optical efficiency is observed when the receiver is displaced from the focus by 1.63% of focal length of the collector in both directions. The collector efficiency decreases by up to 14% when the receiver is offset by 1.63% of focal length of the collector along optical axis (away from the trough).

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Section: Governing Equationsmentioning

confidence: 99%

Performance Evaluation of Parabolic Trough Collector With Receiver Position Error

Donga

Kumar

2021

Journal of Thermal Engineering

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“…Solar energy is one of the most abundant renewable energy sources in the world. It is a solar radiation that can be used in several fields, the most important of which are: electricity production and charge the batteries [3][4][5][6][7], air conditioning [8][9][10][11], heat swimming pools [12], air heating [13][14][15], water heating [16][17][18], nanofluids applications [19,20], solar irrigation [21,22], cook food [23,24], desalination [25,26], drying [27,28] and process heat applications [29,30]. For good use and more efficient use of solar energy, there are many techniques for solar collectors that can be used, including the compound parabolic collectors (CPCs) [31,32], the evacuated tube collectors (ETCs), the Flat-plate collectors (FPCs) [33][34][35], the Heliostat field collectors (HFCs) [36], the linear Fresnel reflectors (LFRs) [37][38][39], the parabolic dish reflector (PDRs) [40,41] and the parabolic trough collectors (PTCs) [42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Optical Numerical Investigation of a Solar Power Plant of Parabolic Trough Collectors

Ghodbane¹,

Boumeddane²,

Hussein³

et al. 2021

Journal of Thermal Engineering

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“…Yildirim et al [42] made the use of absorber plate with rib-groove geometry on absorber plate in solar air heater. Theoretical analysis was done by using energy balance equation and various parameters relative roughness height and roughness pitch and pitch to groove positions were investigated in the Reynolds number range between3000 to 21000.Results were compared with those of flat plate solar air heater.…”

Section: Introductionmentioning

confidence: 99%

Exergetic and Energetic Evaluation of an Innovative Solar Air Heating System Coated With Graphene and Copper Oxide Nano-Particles

Kumar

Verma

2021

Journal of Thermal Engineering

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In the 21 th century, renewable energy has to play very important role in socioeconomic and industrial development. This paper evaluates the exergy-energy analysis, which is based on the second law of thermodynamics. The triangular solar heater is developed to determine the heat transfer rate, thermal efficiency, exergy efficiency and Bejan number. In addition, we have examined the effects of entropy generation with respect to solar radiation and ambient temperature of air. Absorber plates coated with graphene and copper oxide nano-particles by the different percentages (0.1%, 0.2%, 0.3% & 0.4%) doped into black paint which increases the absorption of heat. The Reynolds number (4500 ≤ ≤ 22700) varies for the fixed selective coating on absorber plate and mass flow rate. The experimental observations were performed for constant mass flow rate of air ranging from 0.0035kg/s to 0.018 kg/s. The experimental result gives the average thermal efficiency enhancement of 3.58% for 0.3% graphene/CuO-black paint. Entropy generation is more for 0.1% and minimum for 0.3% graphene/CuO-black paint coating. The entropy generation analysis concludes that the entropy generation increases with increasing the mass flow rate. Exergy efficiency enhancement can be found 0.169%for 0.3% with respect to 0.1% graphene/CuO-black paint.

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Theoretical Investigation of a Solar Air Heater Roughened by Ribs and Grooves

Cited by 13 publications

References 19 publications

Performance Evaluation of Parabolic Trough Collector With Receiver Position Error

Performance Evaluation of Parabolic Trough Collector With Receiver Position Error

Optical Numerical Investigation of a Solar Power Plant of Parabolic Trough Collectors

Exergetic and Energetic Evaluation of an Innovative Solar Air Heating System Coated With Graphene and Copper Oxide Nano-Particles

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