Analysis of exergetic performance for a solar air heater with metal foam fins

Farhan, Ammar A.; Obaid, Zain Alabdeen Hussein; Hussien, Sally Q.

doi:10.1002/htj.21769

Cited by 11 publications

(8 citation statements)

References 31 publications

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“…Experimental parameter data such as usable obtained thermal energy (Q), heat transfer coefficient (h), mass airflow rate (ṁ), and thermal energy efficiency (η%) were matched to anticipated experimental uncertainties (Un) of different solar air collectors. They are calculated with approved error analysis and energy balance using the following equations [15][16][17][18][19][20][21][22][23][24] :…”

Section: Experimental Setup and Measurement Techniquesmentioning

confidence: 99%

“…Several experiments were also conducted in the various works of literature to investigate the thermal efficiency of single‐pass SAHs 24 . These strategies are based on the use of turbulators, 25–27 roughened surfaces, 28 compressed bed materials, and porous media 29,30 .…”

Section: Introductionmentioning

confidence: 99%

“…Several experiments were also conducted in the various works of literature to investigate the thermal efficiency of single-pass SAHs. 24 These strategies are based on the use of turbulators, [25][26][27] roughened surfaces, 28 compressed bed materials, and porous media. 29,30 Moreover, it has been shown that using circular absorbers in single-pass solar heaters reached high efficiency of around 80% compared to 48% and 64% for semi-circular and half-circle shapes, respectively.…”

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confidence: 99%

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The experimental study of energy features for solar air heaters with different turbulator configurations

2022

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To assess the thermal performance in the climate conditions of western and central Iraq, the advantages of using a solar air collector with various turbulator absorber plates are experimentally explored. Four distinct kinds of absorber plates are provided flat plate (F), triangular (T), rectangular (R), and circular (C) turbulators at different air mass flow rates. The collector's economic properties and overall thermal performance are compared to the conventional flat plate turbulator heating systems. The main findings suggest that delta turbulators improve collector economics and overall thermal performance by generating vortex and dampening the formation of the thermal boundary layer in the direction of airflow. Furthermore, when the mass flow rate increases, the thermal performance improves, and the efficiency increases for all mass flow rates, resulting in good thermal performance for the rectangular plate collector when compared to other collectors. When compared to other types of configurations, the daily average efficiency of solar air collectors for flat plate (F), triangular (T), rectangular (R), and circular (C) turbulators are 28%, 67%, 39%, and 48%, respectively, at 50° tilt angle while at 90° tilt angle they are 44%, 76%, 54%, and 63%, respectively, as ṁ = 0.0377 kg/s. The maximum daily average efficiency fitted with rectangular turbulators have about 86% at the largest ṁ = 0.1 kg/s. This study will also give a unique direction to the work trend in the western and central parts of Iraq throughout the winter months.

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Section: Experimental Setup and Measurement Techniquesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The experimental study of energy features for solar air heaters with different turbulator configurations

2022

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“…Nanofluids are suspensions of nanometer-size particles, generally smaller than 100 nm average particle size, suspended in base fluids such as water, ethylene glycol, propylene glycol and oil. With increasing energy demand of the modern society, nanofluid research has received great attention due to the thermal energy efficiency, resulting from the enhanced thermal characteristics of nanofluids with heat exchangers, heat sinks and solar collectors (Farhan et al, 2020) etc. Nguyen and Menn (2009) had numerically studied the problem of a forced laminar flow and heat transfer of Al2O3-water nanofluid, with two different particle sizes, 36nm and 47 nm, inside a two-dimensional flat microchannel.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Nusselt Number for Nanofluids Flow in an Inclined Cylinder

Azeez¹,

Saleem²,

Obaid³

2021

Frontiers in Heat and Mass Transfer

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Numerical investigation is performed for the determination of Nusselt number of ZnO, TiO2 and SiO2 nanoparticles dispersed in 60% ethylene glycol and 40% water inside inclined cylinder for adiabatic and isothermal process. The present study was conducted for both the constant heat flux (10,000 W/m 2 ) and constant wall temperature (313.15 K) boundary conditions. At the inlet, the uniform axial velocity and initial temperature (293 K) were assumed. The results show the change of average Nusselt number at Reynolds number (400), Rayleigh number (10 6 ) and volume fraction percentage (2%). From results for adiabatic process when increasing the slop up to (45 o ), the Nusselt number augments, while Nusselt number is reduced by further tube inclination. As it is clearly seen, the highest value of Nusselt number is corresponded to (45 o ) and for isothermal process it is shown that the value of Nusselt number in horizontal position is higher than the vertical position. The values of Nusselt number ratio were evaluated to be (45%, 31%, 25%) for the three Nano fluids (ZnO, TiO2 and SiO2) respectively, with the insulation (adiabatic) and (36%, 27%, 22%) without insulation (isothermal).

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“…Hybrid configuration could be used for enhancing the performance of collector [15]. Various passive techniques were used such as fins [16], turbulators [17], and reflectors [18], to enhance heat absorption by solar collectors. A SWH is a device which capture the solar insolation to heat the water which can be used for various purposes.…”

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confidence: 99%

Experimental determination for optimal position of reflector in solar water heater

Gaurav,

Verma

2024

Eng. Res. Express

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An experimental investigation was carried out on novel solar water heater that utilizes a flat reflector positioned underneath the absorber tubes. Experiments were conducted at National Institute of Technology Patna, India, having latitude 25.61°N and longitude 85.14°E and constant insolation of 1000 W⁄m^2 . The experimental data were collected for different reflector positions i.e. δ = 0 mm, 15 mm, 30 mm, 45 mm, and 60 mm and six mass flow rates of working fluid i.e. 0.0056 kg/s, 0.0097 kg/s, 0.0138 kg/s, 0.0207 kg/s, 0.0277 kg/s, and 0.0346 kg/s. The obtained experimental results exhibited that the location of the reflector relative to the absorber tubes significantly affects the thermal performance of the system. The effect of the mass flow rate on the outlet temperature, thermal performance, and overall performance has also been studied. For the present system under energy and exergy analysis, the optimal position of the reflector was found of δ = 30 mm. The results showed that the solar water heater with an optimally positioned reflector has a 23% increase in thermal efficiency compared to the solar water heater without a reflector. The novelty of using a flat reflector underneath absorber tube is to provide heat to rear side of the absorber tubes after reflecting the insolation falling on the reflector and hence improvement in the thermal performance of the solar water heater. The scope of present system includes providing an eco-friendly and energy-efficient solution for residential and commercial hot water needs. Limitations of the present study are requirement of sufficient roof space and direct sunlight. The use of reflectors has implications for energy savings, more efficient system designs, and enhanced thermal performance.

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Analysis of exergetic performance for a solar air heater with metal foam fins

Cited by 11 publications

References 31 publications

The experimental study of energy features for solar air heaters with different turbulator configurations

The experimental study of energy features for solar air heaters with different turbulator configurations

Numerical Investigation of Nusselt Number for Nanofluids Flow in an Inclined Cylinder

Experimental determination for optimal position of reflector in solar water heater

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