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دانلود رایکان مقاله انگلیسی ISI با موضوع تحلیل اکسرژی جمع کننده های (کلکتورهای) خورشیدی تشتک سهمی شکل یکپارچه شده با چرخه های رانکین

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تحلیل اکسرژی جمع کننده های (کلکتورهای) خورشیدی تشتک سهمی شکل یکپارچه شده با چرخه های رانکین آلی و بخار ترکیبی

عنوان انگلیسی مقاله:

Exergy analysis of parabolic trough solar collectors integrated with combined steam and organic Rankine cycles

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4. Results and discussion

In designing a solar thermal power plant, the main variable to examine is the variation of solar irradiation on the plant performance. To assess its effect on power plant exergetic performance, variation of the steam turbine inlet pressure is another key variable. Furthermore, investigating the effect of varying the net electrical power output, which in turn affect the solar field size, is another key variable in the exergetic performance of the system. The variation of the net electrical power output in the steam Rankine cycle is attained through varying the mass flow rate of the steam. Therefore, the effects of these three variables on the exergetic performance of the systems considered were examined. The exergetic performance of the systems considered were evaluated, in detail, under solar irradiation intensity – Gb = 0.8 kW/m2 – as an average peak value in which the thermal power plant is operated. Furthermore, the effect of the solar irradiation during daytime on the systems considered was examined, and a wide range of solar intensity was considered, Gb = 0.5–0.9 kW/m2 . The thermodynamic properties under the baseline conditions for the solar irradiation intensity Gb = 0.8 kW/m2 case for the three systems are listed in Tables 3–5. As discussed before, the results are presented for three cases, in which all are integrated with the PTSC. These cases are the steam Rankine cycle under vacuum condensing pressure (SRC-V), the steam Rankine cycle under atmospheric condensing pressure (SRC-A), and the combined cycle operated through steam and a refrigerant in which the exit pressure of the steam turbine is atmospheric pressure for the reasons discussed before. For the combined cycles, seven refrigerants were investigated.