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Comprehensive thermodynamic investigation of three cogeneration systems including GT-HRSG/RORC as the base system, intermediate system and solar hybridized system

Mahdavi, Navid, Khalilarya, Shahram
Energy 2019 v.181 pp. 1252-1272
clean energy, cogeneration systems, combustion, energy efficiency, energy use and consumption, environmental factors, exergy, fossil fuels, greenhouse gas emissions, oils, solar collectors, temperature
In this study, GT-HRSG/RORC cogeneration system is hybridized with a parabolic trough solar collectors field. Due to limited operating temperature range of commercial oils flowing in solar receiver, such improvement requires some changes to profit this clean energy. Three cogeneration systems are compared thermodynamically, which include the following base, intermediate and hybrid systems. Results reveal that although the base system has the maximum energy efficiency than that of the intermediate and solar hybridized systems (84.37%, 61.55%and 75.94%, respectively), solar hybridized cogeneration system proposed in this study is a favorable and promising design in terms of fossil fuel consumption and environmental factors (emission of greenhouse gases). The use of fuel and also the release of CO2for solar hybridized system are reduced around 16.67%and 13.85%, respectively. The more the solar collectors field domain, the better the performance of solar system. Meanwhile, some parameters such as initial investment and temperature range of working fluid in the receiver restrict the domain. Intermediate system (i.e. hybrid system without solar collectors field) produces more net output power than the other cogeneration systems. Moreover, the biggest share of exergy destruction rate belongs to the combustion chamber among all devices for the whole considered systems.