Parametric investigation on thermo-hydraulic performance of wire screen matrix packed solar air heater

Verma, Prashant; Varshney, Lokesh

doi:10.1016/j.seta.2015.02.002

Cited by 17 publications

(10 citation statements)

References 27 publications

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“…The effect of air mass flow rates and bed porosity on the thermal and thermo-hydraulic efficiencies of the counter and parallel flow packed bed solar air heaters are investigated. Verma and Varshney [30] developed a mathematical model to investigate the effect of system and operating parameters on the thermal and thermo-hydraulic performance of wire screen packed bed solar air heater for high (0.887-0.958) and low (0.599-0.729) porosity range.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of optically semi-transparent material packed-bed solar air heater

Chouksey

Sharma

2017

International Journal of Thermodynamics

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This paper deals with theoretical analysis of performance of solar air collector having its duct packed with optically semitransparent materials. The heat transfer equations for two dimensional fully developed fluid flows under quasisteady state conditions have been developed in order to analyze the thermal, thermo-hydraulic and exergy performance and to study the effect of system and operating parameters. A computer programme is developed in C ++ language to estimate the temperature rise of entering air for evaluation of performance by solving the governing equations numerically using relevant correlations for heat transfer coefficient for packed bed systems. Results of air temperature rise and thermal efficiency obtained from the analysis have been compared with available experimental results and results are found fairly in closed agreement. It has been found that there is considerable enhancement in thermal efficiency with packed bed collector. Effect of total bed depth on efficiency show that there is an upper limiting value of total bed depth beyond which the thermal efficiency begins to fall again and this type of characteristics behavior is observed at all mass flow rate. It is also noticed that there exists an optimal value of effective and exergy efficiencies for a given mass flow rate.

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Section: Introductionmentioning

confidence: 99%

Performance analysis of optically semi-transparent material packed-bed solar air heater

Chouksey

Sharma

2017

International Journal of Thermodynamics

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“…Verma and Varshney [31] have also analyzed the effect of system specifications on THP of a WMPSAH through a mathematical model developed in C++ for estimation of effective efficiency and it has been observed that optimum THP of WMPSAH is obtained for a certain value of system conditions and there exists a particular value of duct length, width and depth corresponding to air mass flow rate and for the range of solar radiation 500-1000 W/m 2 THP is high for greater values of insolation at different airflow rates because of the increase in heat energy capture in comparison to heat energy loss.…”

Section: Effect Of Operating Parameters On Thermal Performance Of Wmpsahmentioning

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%

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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“…Verma and Varshney [15] investigated the parameters on thermo-hydraulic performance of wire screen matrix packed solar air heater. The effective efficiency was evaluated by C++ computer programming using solving the governing equations numerically.…”

Section: Introductionmentioning

confidence: 99%

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

Yıldırım¹

2017

Journal of Thermal Engineering

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In this study, thermal and thermohydraulic efficiencies of a solar air collector having a roughened absorber with rib-grooved artificial roughness elements have been investigated and compared with the flat plate solar air collectors. The system has been theoretically investigated for different geometrical roughness parameters by help of energy balance equations between the elements of collector. Geometrical roughness parameters such as ratio of the relative roughness height (RRH), relative roughness pitch (RRP), and groove positions to pitch (GP/PR) are examined for Reynolds number range from 3000 to 21,000.

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Parametric investigation on thermo-hydraulic performance of wire screen matrix packed solar air heater

Cited by 17 publications

References 27 publications

Performance analysis of optically semi-transparent material packed-bed solar air heater

Performance analysis of optically semi-transparent material packed-bed solar air heater

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

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

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