Exergy Analysis of a Solar Heating System

Li, Geng; Çengel, Yunus A.; Turner, R. H.

doi:10.1115/1.2847815

Cited by 20 publications

(7 citation statements)

References 1 publication

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“…Besides this, it is essential to optimize the solar system design and its operation. The solar air heating system has been studied comprehensively, considering different pivotal parameters such as their exergy, exergetic efficiency, and entropy generation …”

Section: Introductionmentioning

confidence: 99%

Exergy analysis of single‐flow solar air collectors with different configurations of absorber plates

Khalil

Obaid

Dawood

2019

Heat Trans. Asian Res.

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In the current study, an experimental analysis of exergy performance for different absorber plates is done. Three types of absorber plates are supplied with different fin arrangements with a variable air mass flow rate. The exergy analysis to evaluate the exergy performance of the solar air heaters uses experimental data for conventional and finned solar air collectors with different arrangements of fins. The main aim of the current study is to compare the exergy performance of the conventional solar air collector with those equipped with fins. The introducing of the fins in different arrangements enhances the absorber surface area, which leads to increased heat transfer. Also, fins induce air turbulence in the flow field, which improves the exergy performance of solar air collector. It is found that the exergy reduces and exergy efficiency enhances with increasing the airflow rate. The traditional flat absorber plate has undesirable exergy loss and exergy efficiency for all ranges of airflow rates. Thus, the flat plate collector presents the most substantial irreversibility, for which the exergy efficiency is the least. However, the results show that the exergy efficiency of inclined staggered turbulators is higher than that of in-line and staggered turbulators. The optimal value of exergy

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Section: Introductionmentioning

confidence: 99%

Exergy analysis of single‐flow solar air collectors with different configurations of absorber plates

Khalil

Obaid

Dawood

2019

Heat Trans. Asian Res.

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“…Solar collectors have been examined in terms of their exergy, exergy efficiency, and entropy generation [4][5][6]. Bejan et al conducted an exergy analysis of a solar collector and found that the amount of exergy delivered by solar collector systems is affected by heat transfer irreversibilities [7].…”

Section: Introductionmentioning

confidence: 99%

Exergy Analysis of Flat Plate Solar Collectors

Wang

et al. 2014

Entropy

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This study proposes the concept of the local heat loss coefficient and examines the calculation method for the average heat loss coefficient and the average absorber plate temperature. It also presents an exergy analysis model of flat plate collectors, considering non-uniformity in temperature distribution along the absorber plate. The computation results agree well with experimental data. The effects of ambient temperature, solar irradiance, fluid inlet temperature, and fluid mass flow rate on useful heat rate, useful exergy rate, and exergy loss rate are examined. An optimal fluid inlet temperature exists for obtaining the maximum useful exergy rate. The calculated optimal fluid inlet temperature is 69 °C, and the maximum useful exergy rate is 101.6 W. Exergy rate distribution is analyzed when ambient temperature, solar irradiance, fluid mass flow rate, and fluid inlet temperature are set to 20 °C, 800 W/m 2 , 0.05 kg/s, and 50 °C, respectively. The exergy efficiency is 5.96%, and the largest exergy loss is caused by the temperature difference between the absorber plate surface and the sun, accounting for 72.86% of the total exergy rate.

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“…However, the energy equalizing does not consider many internal and conversion losses factors. High thermal effectiveness does not maintain the operation high performance [15]. The article [13] presents the theoretical model of the flat solar collectors' energy and exergy analyses, through which we can study the influence of all designed parameters at the operating characteristics.…”

Section: Introductionmentioning

confidence: 99%

Exergy Analysis of Double-Circuit Flat Solar Collector With Thermosyphon Circulation

Wójcik

Kalimoldayev

Amirgaliyev

et al. 2019

IAPGOS

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In the present work, an exergy analysis was done of two-circuit flat solar collector with thermosiphon circulation. The article presents a mathematical model of energy and exergic analysis of flat solar collectors, as well as calculations of solar radiation efficiency, temperature, flow rate of the fluid, exergy rates and exergy loss rates are done. The significance of the results achieved is high, since experimental studies can detect inefficient components of the solar heating system. The exergetic efficiency of a dual-circuit flat solar collector with a thermosiphon circulation describes irreversibility of the process according to thermodynamic parameters. This is caused by a large the degree of overheating achieved at the end of the processes of compression and evaporation, which leads to large differences in heat exchange temperature based on the heat pump cycle. The exergy efficiency value for the entire system is 70. Maximum values energy efficiency and exergy at noon, 32.5% and 2.23%, respectively. The efficiency of exergy is 4%, and the highest the loss of exergy is the difference between the absorber plates and the sun, accounting for 52.86% of the total exergy rate.

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Exergy Analysis of a Solar Heating System

Cited by 20 publications

References 1 publication

Exergy analysis of single‐flow solar air collectors with different configurations of absorber plates

Exergy analysis of single‐flow solar air collectors with different configurations of absorber plates

Exergy Analysis of Flat Plate Solar Collectors

Exergy Analysis of Double-Circuit Flat Solar Collector With Thermosyphon Circulation

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