Journal
INTERNATIONAL JOURNAL OF SUSTAINABLE ENERGY
Volume 37, Issue 2, Pages 193-208Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786451.2016.1256886
Keywords
Solar energy; renewable energy; evacuated tube collector; collector efficiency; absorption chiller; solar fraction; solar cooling
Categories
Funding
- Public Authority for Applied Education and Training (PAAET), Kuwait
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Evacuating the space connecting cover and absorber significantly improves evacuated tube collector (ETC) performance. So, ETCs are progressively utilised all over the world. The main goal of current study is to explore ETC thermal efficiency in hot and severe climate like Kuwait weather conditions. A collector test facility was installed to record ETC thermal performance for one-year period. An extensively developed model for ETCs is presented, employing complete optical and thermal assessment. This study analyses separately optics and heat transfer in the evacuated tubes, allowing the analysis to be extended to different configurations. The predictions obtained are in agreement with experimental. The optimum collector parameters (collector tube length and diameter, mass flow rate and collector tilt angle) are determined. The present results indicate that the optimum tube length is 1.5 m, as at this length a significant improvement is achieved in efficiency for different tube diameters studied. Finally, the heat generated from ETCs is used for solar cooling of a house. Results of the simulation of cooling system indicate that an ETC of area 54 m(2), tilt angle of 25 degrees and storage tank volume of 2.1 m(3) provides 80% of air-conditioning demand in a house located in Kuwait.
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