Abstract
The thermal performance of an evacuated tube solar air collector is experimentally investigated at different air flow rates. Air is used as a working fluid in experimental setup and tested in Indian climatic conditions. The evacuated tube solar air collector consists of fifteen evacuated tubes and manifold channel. The manifold channel consists of a hollow pipe (square pipe) in centre through which air flows. The temperature difference and efficiency are studied with different air flow rates. The reflectors are used to enhance the performance of evacuated tubes solar air collector. It is observed that in case of reflector evacuated tube solar air collector gives higher outlet temperature and temperature difference and has better thermal performance as compared to the case without reflector. The maximum outlet temperature and temperature difference of air are found to be 97.4°C and 74.4°C at a flow rate of 6.70 kg/hr.
Highlights
Nowadays the demand of conventional resources of energy is very high, so these resources are continuously depleting day by day
The results showed that the function relation of the heat loss coefficient of the glass evacuated tube solar collector with temperature difference between the absorbing coating surface and the ambient air was nonlinear
The outlet temperature and temperature difference of air in evacuated tube collector depend upon solar intensity and air flow rate
Summary
Nowadays the demand of conventional resources of energy is very high, so these resources are continuously depleting day by day. The development of renewable energy technology is important for the future to balance global energy resources. For many years the evacuated tube has been used to heat the water but it has never been used for the generation of hot air. One-ended glass evacuated tubes are widely used and are widely popular in the world because evacuated tubes have better performance. The performance of flat plate collectors is lower than evacuated tube solar collectors for high temperature operation. The evacuated tube consisting of two concentric tubes is used to heat the fluid flowing inside the inner tube. The outer portion of the inner glass tube is coated with an absorbing material to absorb heat
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