Oil cost: 1 â¬/lt. - Increase rate of energy cost: 10%. Simple payback time is 7 years. Solar system: parabolic trough collectors, steam generator, thermal oil storage.
TECHNICAL ASSESSMENT OF A CONCENTRATING SOLAR THERMAL SYSTEM FOR INDUSTRIAL PROCESS STEAM Panagiotis Tsekouras1, Rosie Christodoulaki and Vassiliki Drosou1 1 CRES-
Centre for Renewable Energy Sources and Saving, Athens (Greece)
At a glance Solar system: parabolic trough collectors, steam generator, thermal oil storage
Analysis of potential hydraulic configurations of the system
Selection and evaluation of crucial system parameters
Definition and evaluation of the system performance indicators
System simulation (Greenius)
Parametric analysis, modifying important system variables
Technical and economic conclusions
Solar system configuration
Indirect steam production via parabolic trough collectors with liquid thermal fluid with storage
Storage volume Tank material Insulation material Insulation thickness / density
6.4 m3 Stainless steel Mineral wool 100kg/m3 50 cm
Parametric analysis
Effect of the orientation at the system energy solar field heat (Efield) production and the solar field efficiency (nfield)
Effect of the solar aperture area at the system solar fraction (SF)
Simulation results
Effect of the Outlet temperature from the solar collectors with constant inlet temperature of 200oC at the system energy solar field heat (Efield) production and the solar field efficiency (nfield)
Economic figures Summary of energy simulation results
Direct Normal Irradiation Maximum solar collector heat Solar collectors efficiency Useful solar heat Solar Fraction Oil saving Reduction of CO2 emissions
Overall system budget is 573 k€, with the solar collectors absorbing the highest percentage. Main assumptions: - Efficiency system reduction: 1% / year - Operation and Maintenance cost: 4% - Conventional system efficiency: 75% - Oil cost: 1 €/lt - Increase rate of energy cost: 10% Simple payback time is 7 years
