Abstract
In the 21th century, renewable energy has to play very important role in socio-economic and industrial development. This paper evaluates the exergy- energy analysis, which is based on the second law of thermodynamics. The triangular solar heater is developed to determine the heat transfer rate, thermal efficiency, exergy efficiency and Bejan number. In addition, we have examined the effects of entropy generation with respect to solar radiation and ambient temperature of air. Absorber plates coated with graphene and copper oxide nano-particles by the different percentages (0.1%, 0.2%, 0.3% & 0.4%) doped into black paint which increases the absorption of heat. The Reynolds number (4500≤R_e≤22700) varies for the fixed selective coating on absorber plate and mass flow rate. The experimental observations were performed for constant mass flow rate of air ranging from 0.0035kg/s to 0.018 kg/s. The experimental result gives the average thermal efficiency enhancement of 3.58% for 0.3% graphene/CuO-black paint. Entropy generation is more for 0.1% and minimum for 0.3% graphene/CuO-black paint coating. The entropy generation analysis concludes that the entropy generation increases with increasing the mass flow rate. Exergy efficiency enhancement can be found 0.169%for 0.3% with respect to 0.1% graphene/CuO-black paint.
Highlights
The solar air heating systems are highly effective and promising in absorption of solar energy
The aim of the paper is to investigate the thermal efficiency, exergy efficiency, entropy generation and Bejan number by the use of graphene/CuO nano-particles embedded into black paint coating on absorber surface
RESULT AND DISCUSSION we have investigated the effect of absorber plate coating of different percentage graphene and copper oxide nano-particles on the thermal efficiency and exergy analysis
Summary
The solar air heating systems are highly effective and promising in absorption of solar energy. The solar thermal system gives the hot air in the output This hot air can be used for space heating or drying purposes. These systems can produce thermal energy in the form of warm air at the output with the help of absorb solar radiation from the sun. This form of energy production, which is safe, clean, environmental friendly and it cannot produce any harmful effect on the environment. TSAH's main applications include space heating, crop drying, textiles and solar dryers These are cost effective devices and easy to manufacture, require less maintenance cost. The amount of useful energy calculated by TSAH can be increased by increasing the velocity of flowing fluid as air through the inside passage of the TSAH [2]
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