Augmentation of thermal efficiency of the glass evacuated solar tube collector with coaxial heat pipe with different refrigerants and filling ratio

•An inclusive experimental model of modified coaxial heat pipe inserted inside evacuated glass was designed and analyzed.•The optimum filling ratio was investigated at the four mass flow rates.•The maximum thermal efficiency was achieved at filling ratio 30% for mass flow rate m⁰=0.0051 and 0.0062kg...

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Bibliographic Details
Published in:	Energy conversion and management Vol. 138; pp. 286 - 298
Main Authors:	Kabeel, A.E., Khairat Dawood, Mohamed M., Shehata, Ali I.
Format:	Journal Article
Language:	English
Published:	Oxford Elsevier Ltd 15-04-2017 Elsevier Science Ltd
Subjects:	Annuli Evacuation Flow rates Glass evacuated solar collector Heat Heat pipe Heat pipes Mass flow rate Pipes Refrigerants Refrigeration Solar collectors Solar energy Thermal efficiency Thermodynamic efficiency Tilt angle Tubes Working fluids Glass evacuated solar collector Tilt angle Thermal efficiency Heat pipe
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