کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7047868 | 1457125 | 2016 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
HFOs as substitute for R-134a as working fluids in ORC power plants: A thermodynamic assessment and thermal stability analysis
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In this paper we investigate the potential replacement of HFC-134a in ORC applications by two low-GWP refrigerant fluids, namely HFO-1234yf and HFO-1234ze(E). After revising and discussing their main thermo-physical properties, we adopted in our calculations the Peng Robinson EOS available in Aspen Plus v7.3, integrated with literature data. By assuming as reference a geothermal plant operated with HFC-134a, we first consider the direct replacement of the original fluid by the two refrigerants. Results of such off-design simulations show a decrease of the net power of about 13% in case of HFO-1234yf and 1% in case of HFO-1234ze(E). Then, in case of heat recovery from a hot water source, from a comparison among the three refrigerants, with the hypothesis of a completely new design simulation, it turns out that the turbine power results lower than HFC-134a of about 20% and 28% for the cycles using HFO-1234yf and HFO-1234ze(E) respectively. We also show that in case of HFO-1234ze(E) the recuperative heat exchanger could be removed without tangible effects on the useful power and on the cycle efficiency. Finally we assess through an experimental thermal stability analysis that 200-250 °C could be a feasible working temperature limit for HFO-1234yf.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 103, 25 June 2016, Pages 790-797
Journal: Applied Thermal Engineering - Volume 103, 25 June 2016, Pages 790-797
نویسندگان
Costante M. Invernizzi, Paolo Iora, Markus PreiÃinger, Giampaolo Manzolini,