Thermal and Pressure Drop Analysis of Solar Air Heater with and Without Wavy Fin (original) (raw)
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Effect of Collector Aspect Ratio on the Thermal Performance of Wavy Finned Absorber Solar Air Heater
World Academy of Science, Engineering and Technology, International Journal of Electrical, Computer, Energetic, Electronic and Communication Engineering, 2016
A theoretical investigation on the effect of collector aspect ratio on the thermal performance of wavy finned absorber solar air heaters has been performed. For the constant collector area, the various performance parameters have been calculated for plane and wavy finned solar air heaters. It has been found that the performance of wavy finned solar air heater improved with the increase in the collector aspect ratio. The performance of wavy finned solar air heater has been found 30 percent higher than those of plane solar air heater. The obtained results for wavy fin solar air heaters are compared with the available experimental data of most common type solar air heaters.
IJERT-Thermal Performance Comparison of Solar Air Heater Having Wavy Fin and Longitudinal Fin
International Journal of Engineering Research and Technology (IJERT), 2015
https://www.ijert.org/thermal-performance-comparison-of-solar-air-heater-having-wavy-fin-and-longitudinal-fin https://www.ijert.org/research/thermal-performance-comparison-of-solar-air-heater-having-wavy-fin-and-longitudinal-fin-IJERTV4IS090190.pdf The thermal performance of a solar air heater with wavy fins attached were investigated theoretically. The fluid channel has been formed by using wavy fins parallel to fluid flow below the absorber plate. The effects of mass flow rate and fin spacing on the thermal performance and rise in temperature were studied. The indicated results show that fin spacing of 1 cm yields maximum thermal efficiency and the maximum enhancement of 1.29 times in thermal efficiency has been obtained with the use of wavy fins as compared to longitudinal fins. Also, a maximum enhancement in temperature rise has been found as 1.25 times as compared to longitudinal fins at lower mass flow rate of 0.0134kg/s. Nomenclature Wavelength of wavy fin (mm) Density of air (kg/m 3) Stefan-Boltzmann Constant ()e Effective transmittance absorptance product m Mass flow rate (kg/s) Ac Collector area (m 2) Amp Amplitude of wavy fin (mm) Ap Area of absorber plate (m 2) Ar Total heat transfer area (m 2) Dh Hydraulic diameter (m) G Mass velocity (kg/s/m 2) hr Radiative heat transfer coefficient (W/m 2 K)
Influence Of Channel Depth On The Performance Of Wavy Fin Absorber Solar Air Heater
2017
Channel depth is an important design parameter to be fixed in designing a solar air heater. In this paper, a mathematical model has been developed to study the influence of channel duct on the thermal performance of solar air heaters. The channel depth has been varied from 1.5 cm to 3.5 cm for the mass flow range 0.01 to 0.11 kg/s. Based on first law of thermodynamics, the channel depth of 1.5 cm shows better thermal performance for all the mass flow range. Also, better thermohydraulic performance has been found up to 0.05 kg/s, and beyond this, thermohydraulic efficiency starts decreasing. It has been seen that, with the increase in the mass flow rate, the difference between thermal and thermohydraulic efficiency increases because of the increase in pressure drop. At lower mass flow rate, 0.01 kg/s, the thermal and thermohydraulic efficiencies for respective channel depth remain the same.
A B S T R A C T The thermal performance of a single pass solar air heater with five fins attached was investigated experimentally. Longitudinal fins were used inferior the absorber plate to increase the heat exchange and render the flow fluid in the channel uniform. The effect of mass flow rate of air on the outlet temperature, the heat transfer in the thickness of the solar collector, and the thermal efficiency were studied. Experiments were performed for two air mass flow rates of 0.012 and 0.016 kg s À1. Moreover, the maximum efficiency values obtained for the 0.012 and 0.016 kg s À1 with and without fins were 40.02%, 51.50% and 34.92%, 43.94%, respectively. A comparison of the results of the mass flow rates by solar collector with and without fins shows a substantial enhancement in the thermal efficiency.
Effect of Complex Geometry of Wavy Fin on the Performance of Wavy fin Equipped Solar Air Heater
2016
In this paper, an attempt has been made to analyze the effect of system parameters on the thermal and thermohydraulic efficiency of a wavy finned solar air heater. The performance of the wavy finned solar air heater depends on the complex geometry of wavy fin, such as fin spacing ratio(FP/2A), flow length ratio(Ld/L) and flow cross section aspect ratio(FP/Fh). An analytical investigation on the various complex geometries showed that the maximum thermal efficiency of 80.18%, 79.59% and 79.6% and the maximum thermohydraulic efficiency of 72.6%, 76.4% and 73.2% has been found for the FP/2A=1, FP/Fh=0.4 and Ld/L=10 respectively. Furthermore, wavy fin solar air heater resulted higher thermal efficiency of the order of 2.8 times and thermohydraulic efficiency of the order of 2.6 times as compared to plane solar air heater. Overall, both thermal efficiency and thermohydraulic efficiency of wavy finned solar air heater is superior. Index Term-fin spacing ratio; flow length ratio; aspect rat...
Assessment of Performance Characteristic of Solar Air Heater with Assorted Geometries -A Review
Artificial roughness is an efficient way for increasing the heat transfer rate in solar air heater with the corresponding improvement in its thermal performance. A viscous sub-layer is responsible for the low heat transfer coefficient between absorber plate and flowing air. Repeated ribs in form of artificial roughness are an effective way to increase the heat transfer rate and improving the performance of solar air heater. Artificial roughness of the absorber plate is much economical and effective way to improve the thermal performance of solar air heater. Several investigators have done various investigations to improve heat transfer coefficient with little penalty of friction factor. They have also developed different correlation for heat transfer coefficient and friction factor. The correlations developed for heat transfer and friction factor by various investigators have been reviewed and presented.
A Review of Experimental study of Solar Air Heater with different Parameter
Solar energy is an inexhaustible resource. The sun produces vast amounts of renewable solar energy that can be collected and converted into heat and electricity. In the application of solar energy to the heating of dwellings and other uses, the primary element in the heating system is the ‘‘Collector’’. Most collectors employed a black-painted, flat absorber plate with heat-transfer passages built within, above or below it and with one or more glass covers on the top. The heat transfer in solar collector takes place by simultaneous radiation, convection, and conduction.