Operation Optimization and Performance Study of Solar Powered Organic Rankine Power Plant with Regenerator (original) (raw)
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Review and Preliminary Analysis of Organic Rankine Cycle based on Turbine Inlet Temperature
Evergreen, 2018
A comprehensive review of various applications is done with an emphasis on power generation using Organic Rankine Cycle (ORC). The effect of working fluids and different configuration is analysed with varying Turbine Inlet Temperature (TIT). A parametric study for first law efficiency analysis is also done to get a better insight of the ORC. The results obtained suggest the reheat and recuperated cycle as most reasonable option for low temperature power generation. The maximum first law efficiency attained, at turbine inlet temperature of 150°C, are 8.99%, 9.68%, 9.79%, 10.39%, 10.83% and 11.48% for R-254fa, R-236fa, R-236fa, R-227ea, R-134a and R-152a respectively. The results also show that the reheat cycle should not be applied to low temperature applications.
Performance Analysis of a Solar-Powered Organic Rankine Cycle Engine
Journal of the Air & Waste Management Association, 2011
This paper presents the performance analysis of a power plant with the Organic Rankine Cycle (ORC). The power plant is supplied by thermal energy utilized from a solar energy collector. R245fa was the working fluid in the thermodynamic cycle. The organic cycle with heat regeneration was built and tested experimentally. The ORC with a heat regenerator obtained the maximum thermodynamic efficiency of approximately 9%.
International Journal of Electrical, Energy and Power System Engineering, 2021
New and renewable energy sources such as solar, geothermal, and waste heat are energy sources that can be used as a source of energy for Organic Rankine cycle system because the organic Rankine cycle (ORC) requires heat at low temperatures to be used as energy source. The experimental of Organic Rankine Cycle (ORC) systems with solar energy as a heat source was conduct to investigate a small-scale ORC system with R134a as a working fluid by varying the heat source at temperature 75⁰C-95⁰C. The experiment resulted a maximum efficiency, power of system is 4.30%, and 185.9 Watt, where the temperature of heat source is 95⁰C, the pressure and temperature of steam inlet turbine is 1.38 MPa and 67.9oC respectively. Solar energy as the main energy source in the ORC system can reduce energy use up to 49.9% or 4080.8 kJ where the temperature of the water as the heat source in the evaporator is 51°C.
Mechanics & Industry, 2017
In current study, a low temperature organic Rankine cycle (ORC) based on flat plate solar collectors with storage tank is considered. Due to low cost applications, water at ambient pressure is used in both the tank and collectors. Also, the cooling is done by water in ambient temperature. Energy and exergy analysis is used to evaluate the performance of the system under various conditions to find the main sources of exergy destruction and the potential to improve them. Some parameters including exergetic efficiency, thermal efficiency, exergy destruction rate, fuel depletion ratio and irreversibility ratio are investigated. Exergy efficiency and exergy destruction ratio are calculated for the overall system according to the second law of thermodynamics based on daily efficiency. Exergy analysis of each subsystem leads to the choice of the optimum physical parameters for minimum local exergy destruction ratios. Four different working fluids are considered including R245fa, R134a, pentane and toluene to evaluate the system. Results show that the solar collector, thermal storage tank and the vapor generator are the main sources of exergy destruction respectively. Also a parametric study shows that there is an optimum daily exergy efficiency based on turbine inlet temperature. Under the same load, pentane has the best performance followed by R245fa, toluene and R134a. The corresponding daily exergy efficiencies are 24.08%, 22.53%, 22.09% and 21.76%.
Operation optimization of an organic rankine cycle (ORC) heat recovery power plant
Applied Thermal Engineering, 2011
This paper presents a detailed analysis of an organic rankine cycle (ORC) heat recovery power plant using R134a as working fluid. Mathematical models for the expander, evaporator, air cooled condenser and pump are developed to evaluate and optimize the plant performance. Computer programs are developed based on proposed models and algorithms. The effects of controlled variables, including working fluid mass flow rate, air cooled condenser fan air mass flow rate, and expander inlet pressure, on the system thermal efficiency and system net power generation have been investigated. ROSENB optimization algorithm combining with penalty function method is proposed to search the optimal set of operating variables to maximize either the system net power generation or the system thermal efficiency. The optimization results reveal that the relationships between controlled variables (optimal relative working fluid mass flow rate, the optimal relative condenser fan air mass flow rate) and uncontrolled variables (the heat source temperature and the ambient dry bulb temperature) are near liner function for maximizing system net power generation and quadratic function for maximizing the system thermal efficiency.
Organic Rankine cycles (ORCs), are promising technologies for generating power from low and medium grade of heat resources such as geothermal fluids or the synthetic gas from biomass gasification, that have received lots of attention during past twenty years. In this study, thermodynamic evaluations were used based on the first and second laws of thermodynamics to compare different organic fluids and different configuration of Rankine cycles. Energy and Exergy analysis of different configurations of ORCs including basic ORC, basic ORC with Internal Heat Exchanger (IHE), Regenerative ORC and Regenerative ORC with IHE for four dry organic fluids including R113, RC318, iso-pentane and n-hexane, in various ambient temperatures, were simulated using Engineering Equation Solver (EES). In addition, environmental performances were evaluated using the sustainability index method which was resulted from Exergy analysis. The results indicated that the Regenerative ORC with IHE has the best thermodynamic performance with thermal and second law efficiency of 0.217 and 0.642, respectively. It was concluded that the n-hexane which has the highest boiling point and critical temperature is the most efficient working fluid for the cycle. The results indicated that a reduction in ambient temperature causes an increment in both thermal and second law efficiencies and makes the system more sustainable due to an increment in the sustainability index.
Technical-economic Analysis of the Organic Rankine Cycle with Different Energy Sources
Journal of Solar Energy Research, 2020
In this study, the thermodynamic and economical design of an organic Rankine cycle with different energy sources in Arak is investigated. R245fa, Isobutane, R114, R123, Isobutene and Toluene are considered as working fluid. The effects of organic fluids and pinch temperatures on the Rankine cycle performance were examined. The use of other energy sources such as solar energy, biomass, heat recovery from microturbine was Discussed and the cost of power generation was calculated. Isobutene has been selected as the operating fluid of the cycle for further investigation. According to the heat required by the Rankin cycle, the solar tower has been designed and estimated. The output power of the organic Rankine cycle using microturbine is increased by about 20%. The results show over 70% of the solar tower cost is related to mirrors. The highest cost of power generation is the use of microturbine, solar energy, biomass and hot water, respectively.
A study of organic working fluids of an organic Rankine cycle for solar concentrating power plant
Applied Solar Energy, 2014
This work is a comparative study between four different configurations of an organic Rankine cycle (ORC) in order to find the configuration that gives the best performances. This study also made a com parison between seven organic fluids used as working fluids in the four ORC configurations. These fluids are all hydrocarbons. Then we made a parametric analysis of the results obtained in this first part. In a second part, we developed the binary mixtures of the seven pure hydrocarbons with the NIST software REFPROP 9 and we used them in our four ORC configurations. The obtained results are given and discussed.
A REVIEW ON ORGANIC RANKINE CYCLE WITH RESPECT TO POWER PLANT ENGINEERING
www.anveshanaindia.com Abstract New energy conversion technologies required in order to insure the production of electricity without generating the environmental pollution. An important number of new solutions have been proposed to generate electricity from alternative heat source. Waste heat recovery is one of the most important development fields for the organic Rankine cycle (ORC). It can be applied to heat and power plants (for example a small scale cogeneration plant on a domestic water heater) , or to industrial and farming processes such as organic products fermentation, hot exhausts from ovens or furnaces (e.g. lime and cement kilns), flue-gas condensation, exhaust gases from vehicles, inter cooling of a compressor, condenser of a power cycle, etc. Biomass is available all over the world and can be used for the production of electricity on small to medium size scaled power plants. The problem of high specific investment costs for machinery such as steam boilers are overcome due to the low working pressures in ORC power plants. Another advantage is the long operational life of the machine due to the characteristics of the working fluid, that unlike steam is non eroding and non corroding for valve seats tubing and turbine blades. The ORC process also helps to overcome the relatively small amount of input fuel available in many regions because an efficient ORC power plant is possible for smaller sized plants.