Abstract
The analysis of organic regenerative cycles is necessary to verify the possibilities of increasing the work and efficiency of a thermodynamic cycle according to some control parameters. The results obtained from this work can be beneficial in several areas such as solar thermal energy. Simulations of an organic regenerative cycle with up to 4 extractions were carried out in order to analyze the behavior of maximum efficiency and the work generated in the turbine. R134a was used as an organic fluid, used in low temperature cycles. Evaporation temperature data between 60°C and 100°C and superheat temperatures equal to 120°C, 200°C and 300°C were tested for cycle analysis. Thus, it was possible to verify the work behavior and maximum efficiency depending on the number of extractions, superheating temperature and evaporation temperature. The models and simulations were made using the Engineering Equation Solver (EES) software and the results were analyzed in Excel. It was concluded that the maximum efficiency increases with the increase of the evaporation temperature and the number of extractions and decreases with the increase of the superheat temperature. The turbine work grows by increasing the evaporation and superheat temperatures, but decreases with the increase in extractions.
Highlights
The organic Rankine cycle (ORC) is one of the best technologies for converting low or medium temperature energy sources into electricity
The analyses show that there is maximum efficiency for Organic Rankine Cycle (ORC) electrical generation under constant irradiance, evaporation temperature and ambient temperature conditions, varying the regenerative cycle mix heater temperature
The simulations were based on models elaborated in the computer program Engineering Equation Solver (EES), software capable of solving equations in general and used in thermodynamics, with a database of thermophysical properties of fluids
Summary
The organic Rankine cycle (ORC) is one of the best technologies for converting low or medium temperature energy sources into electricity. The thermal efficiency of the ORC system depends on the system components, working fluid, heat source, heat sink and cycle operating conditions [2] To solve these low thermal efficiency problems, different configurations have been introduced in relation to the organic Rankine cycle, including medium preheat organic cycle, regenerative cycle, dual evaporator cycle and ejector cycle [1]. The model was built on the TRNSYS program considering the integration of several submodels: solar collector, single tank thermal storage, auxiliary power system and heat-electricity conversion system With this model, the effects of several important parameters were analyzed: vacuum in the absorber tube, high temperature oil flow, solar radiation intensity and incidence angle. It addresses an approximate way of obtaining a distribution of extractions for the purpose of maximum efficiency
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