Thermodynamic analysis of solar power organic Rankine cycle based on experimental data (original) (raw)
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Organic Rankine cycle technology is suitable for electricity production from low-grade heat sources: solar, geothermal, waste heat. The thermal efficiency of the organic Rankine cycle is influenced the value of the minimum temperature of the cycle, which is the temperature of condensation. The paper analyzes the influence of the condensing temperature on the efficiency of the solar power systems using organic Rankine cycles. Is performed the calculus of thermal efficiency of ORC for condensing temperature in the range 25-10°C. The analyze was done for two different working fluids: R600a and R134a. The results show that the thermal efficiency and amount of electricity produced by a solar ORC system can be increased by lowering the condensing temperature.
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International Journal of Low-Carbon Technologies, 2015
Recently, distributed power systems especially with renewable sources have shown an increasing demand all over the world and have been a technical viable solution to demand growth for electricity. Among these, solar-thermal power plants show a trustworthy source for electricity generation especially for rural areas where small-scale plants are needed. Organic Rankine cycle (ORC) is a suitable power cycle for electricity generation from low-grade heat and has shown a good compatibility with parabolic trough solar collectors (PTCs). In this study, a PTC integrated with an ORC is being studied thermodynamically and economically for small-scale electricity generation up to 100 kW electricity. Four schematics of the cycle including the recuperation and superheating are examined. Effect of superheating and recuperating was investigated on the thermal efficiency and costs of the system. A parametric study shows the effect of key parameters such as turbine inlet temperature and pressure on the characteristics of the system such as net work, thermal efficiency, oil temperature, overall heat transfer coefficient and heat transfer area of shell-and-tube heat exchangers and also on costs of the system. Results show the dependence of the system efficiency and system costs on the operating pressure of heat exchangers. Existence of the Recuperator seems quite effective on increasing the cycle efficiency and, in some cases, lowering the total costs due to lowering the condenser load. A comparison of different working fluids including benzene, butane, pentane, isopentane, R123 and R245fa have been done to cover a wide range of operating pressures and temperatures. Results show that benzene has the best thermodynamic performance among other fluids followed by pentane, isopentane, R123, R245fa and butane. Also, benzene has the highest total cost among other fluids followed by pentane, isopentane, butane, R123 and R245fa. This paper helps to evaluate a solar ORC power plant both thermodynamically and economically.
Design of Organic Rankine Cycle (ORC) Power Plant Systems by Using Flat-Plate Solar Collector
International Journal of Marine Engineering Innovation and Research, 2019
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This paper communicates detailed energy and exergy analysis of low-grade energy resource of solar powered ORC integrated with both the internal heat exchanger and open feed water heater, ORC incorporated with the internal heat exchanger, with open feed water heater and basic ORC respectively. Results highest first law (11.9 %) and exergetic efficiency (51.88%) and lowest exergy destruction (1749kW) of ORC integrated with both the internal heat exchanger and regenerator among other considered ORCs. Moreover, zeotropic mixture (butane/R1234yf) shows better first law and exergetic efficiency and lower exergy destruction than pure fluid.
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SOLAR THERMAL ORGANIC RANKINE CYCLE AS A RENEWABLE ENERGY OPTION
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The objective of the paper is to study the feasibility of an Organic Rankine Cycle (ORC) driven by solar thermal energy as a renewable energy option for small and medium sized commercial usage, power generation of less than 10MW. ORC is principally a conventional Rankine Cycle that uses organic compound as the working fluid instead of water and it is particularly suitable for low temperature applications. Appropriate organic compound includes refrigerants and azeotropes. The ORC and the solar collector are sized according to the solar flux distribution in Malaysia. According to Malaysia Metrological Department, Kota Kinabalu has the highest yearly average of solar radiation in the country for year 2003, for this reason it is chosen for the location of study. The power generation system consists of two cycles, the solar thermal cycle that harness solar energy and the power cycle, which is the ORC that generates electricity. The solar thermal cycle circulates heat transfer fluid (HTF) in the cycle and harness thermal energy from the sun and transfers it to the organic compound in the ORC via a heat exchanger. Components in the power cycle or ORC include an ORC turbine for power generation, a condenser for heat rejection, a pump to increase the pressure and a heat exchanger. The HTF selected in this analysis is Therminol VP3, which is currently used for commercial solar thermal applications. For this research, 2 organic compounds were analyzed, R123 and isobutane. These two compounds are optimized for selection.
Comparative Analysis of Small-Scale Organic Rankine Cycle Systems for Solar Energy Utilisation
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Small-scale organic Rankine cycle (ORC) systems driven by solar energy are compared in this paper, which aims to explore the potential of power generation for domestic utilisation. A solar thermal collector was used as the heat source for a hot water storage tank. Thermal performance was then evaluated in terms of both the conventional ORC and an ORC using thermal driven pump (TDP). It is established that the solar ORC using TDP has a superior performance to the conventional ORC under most working conditions. Results demonstrate that power output of the ORC using TDP ranges from 72 W to 82 W with the increase of evaporating temperature, which shows an improvement of up to 3.3% at a 100 °C evaporating temperature when compared with the power output of the conventional ORC. Energy and exergy efficiencies of the ORC using TDP increase from 11.3% to 12.6% and from 45.8% to 51.3% when the evaporating temperature increases from 75 °C to 100 °C. The efficiency of the ORC using TDP is impro...
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.