Thermodynamic Optimization of the Organic Rankine Cycle in a Concentrating Photovoltaic/Thermal Power Generation System

2013 ◽  
Vol 448-453 ◽  
pp. 1514-1518 ◽  
Author(s):  
Guo Chang Zhao ◽  
Li Ping Song ◽  
Xiao Chen Hou ◽  
Yong Wang
Keyword(s):  
Thermal Power ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Solar Photovoltaic ◽  
Solar Panels ◽  
Generation System ◽  
Evaporation Temperature ◽  
Cycle System ◽  
Power Generation System

The selection criteria of working fluids for solar thermal organic Rankine cycle and the features of R245fa as a working fluid are analyzed. A thermodynamic analysis of photovoltaic / thermal organic Rankine cycle system and the influence of evaporation temperature of working fluid in the evaporator coupled with solar panels are conducted. The results show that the performance of the solar photovoltaic/thermal organic Rankine cycle can be improved by optimizing the evaporation temperature, and 130°C is an appropriate evaporation temperature.

Exergy Analysis of Solar Photovoltaic/Thermal Organic Rankine Cycle

2013 ◽  
Vol 448-453 ◽  
pp. 1509-1513 ◽  
Author(s):  
Guo Chang Zhao ◽  
Li Ping Song ◽  
Yong Wang ◽  
Xiao Chen Hou
Keyword(s):  
Exergy Analysis ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Exergy Efficiency ◽  
Solar Thermal ◽  
Working Fluid ◽  
Solar Photovoltaic ◽  
Generation System ◽  
Cycle System ◽  
Power Generation System

A solar thermal organic Rankine cycle (ORC) power generation system model established using R245fa as the working fluid and coupled with a solar photovoltaic generator is introduced. Thermal efficiency and exergy efficiency of the model both with and without a heat regenerator are calculated and compared. Results show the solar organic Rankine cycle system with a heat regenerator has higher thermal and exergy efficiency than the system without a heat regenerator, providing better performance in practice. This result provides a basis for further application and improvement of solar photovoltaic and the solar thermal organic Rankine cycle.

Experimental Study of the Influence of Light Intensity on Solar Organic Rankine Cycle Power Generation System

2016 ◽  
Vol 138 (4) ◽  
Author(s):  
Yuping Wang ◽  
Lei Tang ◽  
Yiwu Weng
Keyword(s):  
Power Generation ◽  
Fluid Flow ◽  
Light Intensity ◽  
Turning Point ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Experimental Facility ◽  
Generation System ◽  
Power Generation System

A low-temperature (<120 °C) solar organic Rankine cycle (ORC) power generation experimental facility is designed and built. The influence of light intensity on the system performance is investigated using the experimental facility. The results indicate that the system efficiency can reach 2.2%. The temperature of heat transfer fluid (HTF) decreases linearly with light intensity (I). However, both system efficiency and thermoelectric efficiency first decrease linearly and then drop sharply as I decreases at working fluid flow rates (Vwf) of 200 and 160 L/hr, while they only decrease slightly with I at Vwf of 120 L/hr. The light intensity of the turning point is 824 W/m2 at Vwf of 200 L/hr, which corresponds to an HTF temperature of 75 °C. In addition, it is found that the influence of light intensity on the performance of ORC becomes stronger for higher working fluid flow rate. Moreover, the light intensity and HTF temperature at the turning point increase with working fluid flow rate. The experimental results are of great significance for the design and operation of low-temperature solar ORC power generation system.

Analysis and Optimization of ORC for Low-Temperature Waste Heat Power Generation

2011 ◽  
Vol 383-390 ◽  
pp. 6614-6620
Author(s):  
Xin Ling Ma ◽  
Xiang Rui Meng ◽  
Xin Li Wei ◽  
Jia Chang ◽  
Hui Li
Keyword(s):  
Power Generation ◽  
Low Temperature ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Inlet Temperature ◽  
Heat Power ◽  
Generation System ◽  
Power Generation System

This paper presents energy analysis, thermodynamic calculation and exergy analysis for waste heat power generation system of Organic Rankine Cycle based on the first and second laws of thermodynamics. In order to improve system performance, for low-temperature waste heat of 120°C and R245fa organic working fluid, using Aspen Plus software conducted simulation, optimization and improvement. Results from these analyses show that decreasing the expander inlet temperature, increasing inlet pressure of the expander, and adding regenerative heater can increase thermal and exergy efficiencies, at the same time reduce system irreversibility.

High-Efficiency Solar Dynamic Space Power Generation System

1991 ◽  
Vol 113 (3) ◽  
pp. 131-137 ◽  
Author(s):  
Aristide Massardo
Keyword(s):  
Power Generation ◽  
Power Systems ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Combined Cycle ◽  
Working Fluid ◽  
Brayton Cycle ◽  
Generation System ◽  
Dynamic Power ◽  
Power Generation System

Space power technologies have undergone significant advances over the past few years, and great emphasis is being placed on the development of dynamic power systems at this time. A design study has been conducted to evaluate the applicability of a combined cycle concept—closed Brayton cycle and organic Rankine cycle coupling—for solar dynamic space power generation systems. In the concept presented here (solar dynamic combined cycle), the waste heat rejected by the closed Brayton cycle working fluid is utilized to heat the organic working fluid of an organic Rankine cycle system. This allows the solar dynamic combined cycle efficiency to be increased compared to the efficiencies of two subsystems (closed Brayton cycle and organic fluid cycle). Also, for small-size space power systems (up to 50 kW), the efficiency of the solar dynamic combined cycle can be comparable with Stirling engine performance. The closed Brayton cycle and organic Rankine cycle designs are based on a great deal of maturity assessed in much previous work on terrestrial and solar dynamic power systems. This is not yet true for the Stirling cycles. The purpose of this paper is to analyze the performance of the new space power generation system (solar dynamic combined cycle). The significant benefits of the solar dynamic combined cycle concept such as efficiency increase, mass reduction, specific area—collector and radiator—reduction, are presented and discussed for a low earth orbit space station application.

scholarly journals Experimental Study of a Lab-Scale Organic Rankine Cycle System for Heat and Water Recovery from Flue Gas in Thermal Power Plants

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4328
Author(s):  
Young-Min Kim ◽  
Assmelash Negash ◽  
Syed Safeer Mehdi Shamsi ◽  
Dong-Gil Shin ◽  
Gyubaek Cho
Keyword(s):  
Power Plant ◽  
Flue Gas ◽  
Power Plants ◽  
Thermal Power ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Water Recovery ◽  
Cycle System ◽  
Fossil Fuel Power Plants

Fossil fuel power plants can cause numerous environmental issues, owing to exhaust emissions and substantial water consumption. In a thermal power plant, heat and water recovery from flue gas can reduce CO2 emissions and water demand. High-humidity flue gas averts the diffusion of pollutants, enhances the secondary transformation of air pollutants, and leads to smog weather; hence, water recovery from flue gas can also help to lessen the incidence of white plumes and smog near and around the power plant. In this study, a lab-scale system for heat and water recovery from flue gas was tested. The flue gas was initially cooled by an organic Rankine cycle (ORC) system to produce power. This gas was further cooled by an aftercooler, using the same working fluid to condense the water and condensable particulate matter in the flue gas. The ORC system can produce approximately 220 W of additional power from flue gas at 140 °C, with a thermal efficiency of 10%. By cooling the flue gas below 30–40 °C, the aftercooler can recover 60% of the water in it.

Design and Research on Control System of 200Kw Organic Working Fluid Turbine

2014 ◽  
Vol 598 ◽  
pp. 578-582
Author(s):  
Jian Pan ◽  
Yue Huang ◽  
Wei Gao ◽  
Yan Ping Zhang
Keyword(s):  
Control System ◽  
New Technology ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Good Effect ◽  
Working Fluid ◽  
Generation System ◽  
Simulation Experiments ◽  
Simulation Research ◽  
Power Generation System

The power generation system using Organic Rankine Cycle (ORC) is a new technology for energy recovery, but very few people have studied the control system of the organic working fluid turbine at present. This paper put forward the speed and power control strategy about the organic working fluid turbine. The parameters of the speed and power regulators are tuned to insure the steady of speed and power. A series of dynamic simulation experiments are carried out in Simulink. Through the simulation research of robustness and load disturbance experiments, the designed control system have a good effect on accuracy and dynamic response.

scholarly journals Multi-objective analysis of an influence of a brine mineralization on an optimal evaporation temperature in ORC power plant

2018 ◽  
Vol 70 ◽  
pp. 01005 ◽  
Author(s):  
Marcin Jankowski ◽  
Sławomir Wiśniewski ◽  
Aleksandra Borsukiewicz
Keyword(s):  
Power Plant ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Electricity Production ◽  
Working Fluid ◽  
Low Grade ◽  
Multi Objective ◽  
Evaporation Temperature ◽  
Cycle System ◽  
Low Grade Heat

The fact that Organic Rankine cycle system is very promising technology in terms of electricity production using low grade heat sources, necessitates constant research in order to determine the best cycle configuration or choose the most suitable working fluid for certain application. In this paper, multi-objective optimization (MOO) approach has been applied in order to conduct an analysis that is to resolve if there is an influence of a mineralization of a geothermal water on an optimal evaporation temperature in ORC power plant with R1234yf as the working fluid.

Performance Analysis of a Solar-Assisted Organic Rankine Cycle

2020 ◽  
Author(s):  
M. T. Nitsas ◽  
I. P. Koronaki
Keyword(s):  
Mathematical Model ◽  
Performance Analysis ◽  
Temporal Variation ◽  
Storage Tank ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Evaporation Temperature ◽  
Solar Powered ◽  
The Mathematical Model

Abstract The objective of this paper is the thermodynamic analysis of a solar powered Organic Rankine Cycle (O.R.C.) and the investigation of potential working fluids in order to select the optimum one. A dynamic model for a solar O.R.C. with a storage tank, which produces electricity is developed. The mathematical model includes all the equations that describe the operation of the solar collectors, the storage tank, the Rankine Cycle and the feedback between them. The model runs for representative days throughout the year, calculating the net produced energy as a function of the selected evaporation temperature for every suitable working fluid. Above that, the temporal variation of the systems’ temperatures, collectors’ efficiency and net produced power, for the optimum organic fluid and evaporation temperature are presented.

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