Author(s):
1. Saša Pavlović, Faculty of Mechanical Engineering in Niš, Serbia
2. Velimir Stefanovic, Faculty of Mechanical Engineering in Niš, Serbia
3. Bellos Evangelos, National Technical University of Athens, Zografou, Heroon Polytechniou , Greece
4. Christos Tzivanidis, National Technical University of Athens, Zografou, Heroon Polytechniou , Greece

Abstract:
The objective of this work is to examine experimentally and numerically a solar dish collector and to examine the impact of possible improvements in its performance. The examined solar dish collector has a spiral absorber and it is lightweight, fact that makes the system to have low cost and to be sustainable. The experimental results are compared with a developed numerical model in EES (Engineering Equation Solver) and accordance between the results is observed. The validated numerical model is used for further investigation of the solar collector for operation with Therminol VP1. In the first part of the investigation, the impact of flow rate on the thermal and exergetic performance is examined, and finally 200 l/h was found as the best solution. The next part is the optical investigation of the collector and greater optical efficiencies are tested. It is found that optical performance of 75% leads to maximum exergetic efficiency of 22.49%, three times greater than 7.49% which corresponds to the present situation of 35% optical efficiency. In the last part of this study, the selective absorber is compared to the non-selective of the real system and it is found that the use of the first is vital for achieving high operating temperature levels. The results of this study can be used as guidelines for the future improvement of the present facility.

Key words:
Solar dish collector,thermal analysis,exergy analysis,parametric analysis

Thematic field:
Energetics and Thermal Engineering

Date of abstract submission:
01.02.2017.

Conference:
13th International Conference on Accomplishments in Mechanical and Industrial Engineering

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