Performance analysis of double pass solar air heater with packed bed porous media in Rajshahi

Roy, Amit; Hoque, Md. Emdadul

doi:10.1063/1.4984639

Cited by 12 publications

(10 citation statements)

References 19 publications

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“…A solar air collector is a device that utilizes solar energy for heating air which acts as a heat exchanger converts solar energy into thermal energy in the transport medium [1]. Collectors are typically commonly used for drying agricultural products such as fruit, vegetables, seeds, industrial processes, and space heating.…”

Section: Introductionmentioning

confidence: 99%

Thermal Investigations of Double Pass Solar Air Heater with Two Types of Porous Media of Different Thermal Conductivity

Jalil¹,

Ali

2021

ETJ

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This study describes an experimental investigation of the thermal efficiency of stainless steel mesh and steel wool as a porous medium in the lower channel of a double pass solar air heater. An experimental setup was planned and developed. Various types of porous media with high thermal conductivity and with different porosities have been tested. The effects of the porosity of wire mesh, the thermal conductivity of porous media, mass flow rate, and the intensity of radiation have been studied. Experimental results show that thermal efficiency with using porous media is greater than without using porous media. When used steel wool as a porous medium, the thermal efficiency reached 79.82 percent while it can be achieved 76. The percent by using stainless mesh as porous material. The reduction in porosity increasing thermal efficiency. The thermal efficiency of multi-pass solar air collector when used steel wool as porous media is 6, 12.6 and31.7percent higher than without porous media at porosity 98.75, 97.5, and 96.25percent. While it can increase 8.1 and 28.5 percent at porosity 97.875 and 95.75 percent when using stainless steel as porous media.

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Section: Introductionmentioning

confidence: 99%

Thermal Investigations of Double Pass Solar Air Heater with Two Types of Porous Media of Different Thermal Conductivity

Jalil¹,

Ali

2021

ETJ

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“…Roy and Hoque [34] have studied experimentally the effect of mass flow rate on the thermal performance of counter flow DPSAH and found that the thermal efficiency increases as the mass flow rate of air increases and the maximum thermal efficiency observed to be 82. In Double pass counter flow arrangement the air is first introduced below the absorber plate and after extracting the heat energy at lower side of absorber plate it is redirected in the opposite direction above the absorber plate.…”

Section: Double Pass Sahmentioning

confidence: 99%

“…Roy and Hoque [34] have studied experimentally the effect of mass flow rate on the thermal performance of counter flow DPSAH and found that the thermal efficiency increases as the mass flow rate of air increases and the maximum thermal efficiency observed to be 82.2% for mass flow rate of 0.0251 kg/s, however no investigation is carried out on the THP of SAH. Sopian et al [46] developed a theoretical model of a counter flow DPSAH using steel wool as porous absorbing material and reported that the thermal efficiency of collector increases with the increase in insolation and is higher as compared to conventional SPSAH.…”

Section: Double Pass Sahmentioning

confidence: 99%

“…The thermal energy transfer rate can be enhanced by promoting turbulence in the heat transfer region. This disturbance can be accomplished by using various packing elements such as granular carbon and desert sand [10], hollow spheres [11], crushed glass [12], iron and aluminum chips [13], pebbles [14] and the wire screens [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

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A Critical Review on Thermo-Hydraulic Performance of Wire Screen Matrix Packed Solar Air Heaters

Verma

Saxena²,

Varshney

2021

DGAEJ

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Solar air heaters (SAHs) have an important role in applications such as space heating and industrial drying worldwide. The packing of SAH bed not only increases the heat transfer area but also increases the pumping power losses thereby limiting the thermo-hydraulic performance. In the present study, efforts have been made for a critical assessment of the literature dealing with the impact of collector bed and operating parameters over thermal and thermo-hydraulic performance for different configurations of wire screen matrix packed SAH. The porosity of bed and mass flow rate of the air have a major influence on the thermo-hydraulic performance of wire screen matrix packed SAH. It is found that the enhancement in the volumetric heat transfer coefficient due to a decrease in bed porosity is obtained at the expense of increase in pumping power which ultimately affects the thermo-hydraulic performance of wire screen matrix packed SAH. In general it is observed that porosity is an important parameter that affects the thermo-hydraulic performance. It is seen that matrix having porosity 0.937 yields thermo-hydraulic performance of 68% at mass flow rate 0.023 kg/s where as for the same mass flow rate porosity of 0.887 results thermo-hydraulic performance of only 42%.

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“…Numerous techniques have so far been used to improve the heat transfer rate and the thermal efficiency of SAH. Initially, packed bed techniques were used by researchers [1]. Thereafter, fins were applied in SAH to improve the performance [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Correlation for Nusselt Number and Friction Factor for Solar Air Heater Having Absorber Roughened by Chamfered-square Elements

Azad¹

2019

IJFMTS

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The idea of introducing artificial roughness on absorber plate to improve the thermal performance of a solar air heater is very common now days. The technique uses the concept of providing artificial roughness by imbedded element in the absorber plate of the heater. Diagonally chamfered cuboids have been used as roughness element in the current study. A numerical study is performed to investigate the enhancement of the thermo-hydraulic performance of the heater for the various affecting parameters such as Relative Roughness Pitch (Transverse and Longitudinal) of 6 to 14, cross section of cuboids from 8 mm to 14 mm and relative roughness height of 0.44 to 0.088. The range of Reynolds number used in this study was 5000 to 22500. During the study a constant heat flux of 1000 W/m 2 on the absorber plate was considered. The standard k-ε turbulence model with enhanced wall treatment of the ANSYS FLUENT software has been used for numerical computation and to handle the flow turbulence. The Nusselt number and the average friction factor are determined for different values of relative roughness pitch and cross sectional areas of the roughness element. Using calculated computational data correlations for Nusselt number as well as friction factor have been developed as a function of flow and roughness parameters for solar air heaters. The predicted and computational values of Nusselt number and friction factor show a good agreement.

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Performance analysis of double pass solar air heater with packed bed porous media in Rajshahi

Cited by 12 publications

References 19 publications

Thermal Investigations of Double Pass Solar Air Heater with Two Types of Porous Media of Different Thermal Conductivity

Thermal Investigations of Double Pass Solar Air Heater with Two Types of Porous Media of Different Thermal Conductivity

A Critical Review on Thermo-Hydraulic Performance of Wire Screen Matrix Packed Solar Air Heaters

Correlation for Nusselt Number and Friction Factor for Solar Air Heater Having Absorber Roughened by Chamfered-square Elements

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