Exergy based performance evaluation of solar air heater with arc-shaped wire roughened absorber plate

Sahu, Mukesh Kumar; Prasad, Radha Krishna

doi:10.1016/j.renene.2016.04.083

Cited by 106 publications

(35 citation statements)

References 21 publications

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“…To evaluate the top loss coefficient, U t , an approximate initial mean plate temperature is assumed and proceeded to find approximate values of U L , F R and Q u [5].…”

Section: Evaluation Of Thermal Efficiencymentioning

confidence: 99%

“…where Nu ab−f is the Nusselt number for smooth plate solar air heater duct for Re ≥ 2300 given by [5] Nu ab−f = 0.024(Re)…”

Section: Entropy Generation Analysis Of Solar Collectormentioning

confidence: 99%

“…Several roughness elements with different geometries have been employed by the investigators in order to enhance the heat transfer rate and thereby to have improved overall thermal performance of such solar air heaters (SAH). The evaluation of thermal efficiency is an incomplete measure of performance because it does not take into account all the factors required for evaluation of overall performance of a solar collector [4,5]. Thermal efficiency only accounts for quantity of energy transferred, and can be ambiguous where heat is recovered at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Entropy generation and thermodynamic analysis of solar air heaters with artificial roughness on absorber plate

Prasad

Sahu

2017

Archives of Thermodynamics

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This paper presents mathematical modelling and numerical analysis to evaluate entropy generation analysis (EGA) by considering pressure drop and second law efficiency based on thermodynamics for forced convection heat transfer in rectangular duct of a solar air heater with wire as artificial roughness in the form of arc shape geometry on the absorber plate. The investigation includes evaluations of entropy generation, entropy generation number, Bejan number and irreversibilities of roughened as well as smooth absorber plate solar air heaters to compare the relative performances. Furthermore, effects of various roughness parameters and operating parameters on entropy generation have also been investigated. Entropy generation and irreversibilities (exergy destroyed) has its minimum value at relative roughness height of 0.0422 and relative angle of attack of 0.33, which leads to the maximum exergetic efficiency. Entropy generation and exergy based analyses can be adopted for the evaluation of the overall performance of solar air heaters.

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“…To evaluate the top loss coefficient, U t , an approximate initial mean plate temperature is assumed and proceeded to find approximate values of U L , F R and Q u [5].…”

Section: Evaluation Of Thermal Efficiencymentioning

confidence: 99%

“…where Nu ab−f is the Nusselt number for smooth plate solar air heater duct for Re ≥ 2300 given by [5] Nu ab−f = 0.024(Re)…”

Section: Entropy Generation Analysis Of Solar Collectormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Entropy generation and thermodynamic analysis of solar air heaters with artificial roughness on absorber plate

Prasad

Sahu

2017

Archives of Thermodynamics

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“…The effect of geometrical parameters of SAH and Re numbers was studied with regard to energy and exergy efficiencies by Bahrehmand et al 11 The results showed that parameters such as collector length and channel depth for different Re numbers are critical to SAH design. Energy and exergy performance for wavy fins attached to the back of the absorber plate were examined numerically by Priyam et al, 12 and the exergy performance of SAH with arc‐shaped wire rib was evaluated analytically by Sahu and Prasad 13 . It was observed that the exergy efficiency of the roughened absorber plate was 56% greater than that of the smooth absorber plate.…”

Section: Introductionmentioning

confidence: 99%

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

2020

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In this experimental study, an exergetic analysis is presented for solar air heaters (SAHs) that have absorber plates equipped with different fin arrangements. The following two types of fins were used: solid fins (conventional) and metal foam fins. Longitudinal, staggered, and corrugated fin arrangements in SAHs were investigated under the weather conditions experienced in Baghdad, Iraq in February to April 2018. The exergy efficiency and exergy loss of the SAHs were evaluated for five air mass flow rates ranging from 0.011 to 0.059 kg/s. Based on the exergy analysis, SAHs with metal foam fins are more efficient than those with solid fins. In addition, corrugated metal foam fins introduce more turbulent flow than the other fin configurations. It was found that the exergy loss and the exergy efficiency were directly proportional to the values of solar irradiance and air mass flow rates. At solar noon, the maximum values for exergy change were 127 and 89 W/m2 for air mass flow rates of 0.011 and 0.059 kg/s, respectively.

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“…Hedayatizadeh et al [15] carried out and investigated the exergy loss-based efficiency optimisation of a double pass v-corrugated plate solar air heater. Sahu and Prasad [16] carried out an exergetic analysis of SAH having arc-shaped, wireroughened absorber plates.…”

Section: Introductionmentioning

confidence: 99%

Exergetic Performance Prediction of a Roughened Solar Air Heater Using Artificial Neural Network

2018

SV-JME

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Energy plays an essential role in the economic growth of a nation. Fossil fuels are limited and are becoming exhausted day-by-day, so it is necessary to develop alternative sources of energy. Among various types of renewable sources of energy, solar energy is one of the most abundant and clean sources. There are two ways of solar energy utilization: active and passive. A solar air heater (SAH) is in the category of active solar energy utilization. In the solar air heating system, the solar collector or absorber plate is the main component, which collects the solar radiation in the form of heat and transfers it to air flowing across it. Due to the lower value of heat capacity and low thermal conductivity of air, the convective heat transfer coefficient between the absorber plate and the air passing through it is low; thus, the major issue is to enhance the value of the heat transfer coefficient. One of the best techniques for enhancement of heat transfer coefficient is to use artificial roughness on the airflow side of the absorber plate. The use of roughness creates turbulence near the surface of absorber plate, which increases the heat transfer coefficient. Researchers (Bhushan and Singh) have studied the performance enhancement of SAHs by using artificial roughness on the absorber plate.The actual performance of SAH can be evaluated by the implementation of both energy and exergy analyses. The energy analysis alone does not give the direction of the process implementation and the information about the quality of various kinds of energies involved in the system. It also does not indicate the various internal irreversibilities. These problems are overcome by using exergy analysis [5] to [8]. In view of this, in the present investigation, the exergy analysis of roughened SAH has been carried out.Recently 0.99584, 0.99997, 0.99517, 0.99997 and 0.99983

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Exergy based performance evaluation of solar air heater with arc-shaped wire roughened absorber plate

Cited by 106 publications

References 21 publications

Entropy generation and thermodynamic analysis of solar air heaters with artificial roughness on absorber plate

Entropy generation and thermodynamic analysis of solar air heaters with artificial roughness on absorber plate

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

Exergetic Performance Prediction of a Roughened Solar Air Heater Using Artificial Neural Network

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