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This review composition aimed to comprehensively present the experimental investigation procedures and thermal performance augmentation techniques of solar air heaters. Various testing standards such as static and dynamic tests, and performance parameters, such as, thermal, thermo-hydraulic, and exergy efficiencies, are incorporated to present the experimental investigation procedures. The present review work deals with testing conditions (indoor and outdoor), instrumentation, various parameters of interest with corresponding optimum values, their uncertainty levels together with SAH orientation, air flow type, thermal energy storage devices, duct modifications and heat transfer surfaces using fins, baffles, and ribs employed to enhance the thermal performance. The authors of this review work believed that the current composition constitutes a summary of details to quickly access the information for analyzing the various experimental investigation procedures and heat transfer augmentation techniques along with the optimum values of flow and geometric parameters. Moreover, economical and efficient solar air-heating systems with low pressure drop and high heat exchange to air are presented and reviewed.

-A 2 m 3 floating dome anaerobic digester has been developed and its performance is compared with that of conventional mild steel dome biogas digester The overall objective of carrying the work is anlalyze the efficiency of biogas production for better performance of the digester tank and to optimize the biogas generation under normal operating conditions. The lab scale experiments are carried out in both the digesters in order to determine the composition of biogas and their efficiency. The gas samples which are collected through gas balloons from the biogas plant are taken to the laboratory for determination of composition of biogas by using gas chromatography. The results reviewed that methane composition is increased from 63.40% to 64.22% which holds good as of performance is considered .The greater methane yields results in better performance of the plant and proves to be more effective when compared to that of mild steel dome digester.

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