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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| Published in: | Energy conversion and management Vol. 138; pp. 286 - 298 |
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| Main Authors: | , , |
| Format: | Journal Article |
| Language: | English |
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15-04-2017
Elsevier Science Ltd |
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| Abstract | •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/s.
Modified coaxial heat pipes have been designed and manufactured to improve the thermal performance of the glass evacuated solar collectors. Heat pipes were made up of two concentric copper tubes so that the annulus volume space between the concentric tubes was charged with refrigerant. In addition, the air as the working fluid at four different mass flow rates 0.0051, 0.0062, 0.007 and 0.009kg/s flows through the inner tube of the heat pipe to the flow through the annulus between the heat pipe and glass evacuated solar tubes. The effect ofthe tilt angleofthe evacuated tube on thermal performance of the evacuated solar tube collector was examined to obtain the optimum tilt angle during the experiments period. The influence of filling ratio for the two types of refrigerant R22 and R 134a on the thermal efficiency of the coaxial heat pipe solar collector at filing ratio range from 30% to 60% was conducted experimentally. Results show that the maximum increased in the thermal efficiency reached 67% corresponding to without heat pipes at mass flow rate 0.009kg/s. The experiment results showed similarity between the two refrigerants. |
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| AbstractList | Modified coaxial heat pipes have been designed and manufactured to improve the thermal performance of the glass evacuated solar collectors. Heat pipes were made up of two concentric copper tubes so that the annulus volume space between the concentric tubes was charged with refrigerant. In addition, the air as the working fluid at four different mass flow rates 0.0051, 0.0062, 0.007 and 0.009 kg/s flows through the inner tube of the heat pipe to the flow through the annulus between the heat pipe and glass evacuated solar tubes. The effect of the tilt angle of the evacuated tube on thermal performance of the evacuated solar tube collector was examined to obtain the optimum tilt angle during the experiments period. The influence of filling ratio for the two types of refrigerant R22 and R 134a on the thermal efficiency of the coaxial heat pipe solar collector at filing ratio range from 30% to 60% was conducted experimentally. Results show that the maximum increased in the thermal efficiency reached 67% corresponding to without heat pipes at mass flow rate 0.009 kg/s. The experiment results showed similarity between the two refrigerants. •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/s. Modified coaxial heat pipes have been designed and manufactured to improve the thermal performance of the glass evacuated solar collectors. Heat pipes were made up of two concentric copper tubes so that the annulus volume space between the concentric tubes was charged with refrigerant. In addition, the air as the working fluid at four different mass flow rates 0.0051, 0.0062, 0.007 and 0.009kg/s flows through the inner tube of the heat pipe to the flow through the annulus between the heat pipe and glass evacuated solar tubes. The effect ofthe tilt angleofthe evacuated tube on thermal performance of the evacuated solar tube collector was examined to obtain the optimum tilt angle during the experiments period. The influence of filling ratio for the two types of refrigerant R22 and R 134a on the thermal efficiency of the coaxial heat pipe solar collector at filing ratio range from 30% to 60% was conducted experimentally. Results show that the maximum increased in the thermal efficiency reached 67% corresponding to without heat pipes at mass flow rate 0.009kg/s. The experiment results showed similarity between the two refrigerants. |
| Author | Kabeel, A.E. Khairat Dawood, Mohamed M. Shehata, Ali I. |
| Author_xml | – sequence: 1 givenname: A.E. surname: Kabeel fullname: Kabeel, A.E. email: kabeel6@hotmail.com organization: Mechanical Power Engineering Department, Faculty of Engineering, Tanta University, Tanta, Egypt – sequence: 2 givenname: Mohamed M. surname: Khairat Dawood fullname: Khairat Dawood, Mohamed M. organization: Mechanical Engineering Department, Faculty of Engineering, Suez Canal University, Ismailia, Egypt – sequence: 3 givenname: Ali I. surname: Shehata fullname: Shehata, Ali I. organization: Mechanical Engineering Department, Arab Academy for Science, Technology and Maritime, Egypt |
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| Snippet | •An inclusive experimental model of modified coaxial heat pipe inserted inside evacuated glass was designed and analyzed.•The optimum filling ratio was... Modified coaxial heat pipes have been designed and manufactured to improve the thermal performance of the glass evacuated solar collectors. Heat pipes were... |
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| SubjectTerms | 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 |
| Title | Augmentation of thermal efficiency of the glass evacuated solar tube collector with coaxial heat pipe with different refrigerants and filling ratio |
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