Waste Heat Rejection Systems for Organic Rankine Cycle Dynamic Isotope Power System

1987 ◽  
Author(s):  
T. J. Bland ◽  
W. J. Greenlee ◽  
K. Clodfelter
Keyword(s):  
Power System ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Heat Rejection

Waste Heat Produces Electrical Power System, Using Organic Rankine Cycle (ORC) from Steelworks

2012 ◽  
Vol 512-515 ◽  
pp. 1338-1342
Author(s):  
Song Xiao ◽  
Shu Ying Wu ◽  
Dong Sheng Zheng
Keyword(s):  
Mathematical Model ◽  
Power System ◽  
Waste Heat ◽  
Electrical Power ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Design Parameters ◽  
Electrical Power System ◽  
Condenser Temperature ◽  
Energetic Performance

This study presents an energetic performance analysis for a waste heat produces electrical power system which is use organic Rankine cycle (ORC) from steelworks. In order to simulate the system under steady-state conditions, a mathematical model is developed. The developed model is used to determine the potential effects caused by the changes of the design parameters on the energetic performance of the system. As design parameters, turbine inlet pressure, condenser temperature, are taken into account. In this regard, the electrical power is estimated by parametrical analysis and discussed comprehensively.

Thermodynamic Analysis of a SCO2 Part-Flow Cycle Combined With an Organic Rankine Cycle With Liquefied Natural Gas as Heat Sink

2014 ◽  
Author(s):  
Hanzhen Zhang ◽  
Shuai Shao ◽  
Hang Zhao ◽  
Zhenping Feng
Keyword(s):  
Natural Gas ◽  
Power System ◽  
Heat Sink ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Liquefied Natural Gas ◽  
Operating Conditions ◽  
Flow Cycle ◽  
Integrated Power System

The supercritical carbon dioxide (SCO2) part-flow cycle can achieve higher efficiency compared with conventional Brayton cycle as it can avoid the pinch point problem inside the regenerative heat exchanger. To recover the waste heat from the pre-cooler in the cycle and improve the overall cycle efficiency, a new integrated power system driven by nuclear reactor is proposed to achieve the energy cascade utilization. This system combines a SCO2 part-flow cycle with an organic Rankine cycle (ORC) using liquefied natural gas (LNG) as heat sink to utilize the cold energy of LNG. In this paper a mathematical model is established to simulate the SCO2 part-flow cycle coupled with an ORC under steady state condition, and a thermodynamic parametric analysis is conducted to investigate the effects of some key parameters, including the turbine inlet pressure, the turbine and compressor isentropic efficiency and pressure drop ratio, on the system performance. The results indicate that the integrated power system is effective to recover the waste heat and may achieve the overall cycle thermal efficiency of 52.12% under the operating conditions of 20MPa, 800K and part-flow ratio 0.68, which can be further improved with parametric optimization of the system.

scholarly journals Component-Oriented Modeling of a Micro-Scale Organic Rankine Cycle System for Waste Heat Recovery Applications

2021 ◽  
Vol 11 (5) ◽  
pp. 1984
Author(s):  
Ramin Moradi ◽  
Emanuele Habib ◽  
Enrico Bocci ◽  
Luca Cioccolanti
Keyword(s):  
Electric Power ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Operating Conditions ◽  
Working Fluid ◽  
Pump Efficiency ◽  
Micro Scale

Organic Rankine cycle (ORC) systems are some of the most suitable technologies to produce electricity from low-temperature waste heat. In this study, a non-regenerative, micro-scale ORC system was tested in off-design conditions using R134a as the working fluid. The experimental data were then used to tune the semi-empirical models of the main components of the system. Eventually, the models were used in a component-oriented system solver to map the system electric performance at varying operating conditions. The analysis highlighted the non-negligible impact of the plunger pump on the system performance Indeed, the experimental results showed that the low pump efficiency in the investigated operating range can lead to negative net electric power in some working conditions. For most data points, the expander and the pump isentropic efficiencies are found in the approximate ranges of 35% to 55% and 17% to 34%, respectively. Furthermore, the maximum net electric power was about 200 W with a net electric efficiency of about 1.2%, thus also stressing the importance of a proper selection of the pump for waste heat recovery applications.

scholarly journals Organic Rankine cycle for turboprop engine application

2021 ◽  
pp. 1-21
Author(s):  
G.E. Pateropoulos ◽  
T.G. Efstathiadis ◽  
A.I. Kalfas
Keyword(s):  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Weight Ratio ◽  
Rankine Cycle ◽  
Aircraft Engine ◽  
Working Fluid ◽  
Engine Fuel ◽  
Exhaust Gases ◽  
Waste Heat Recovery System ◽  
Turboprop Engine

ABSTRACT The potential to recover waste heat from the exhaust gases of a turboprop engine and produce useful work through an Organic Rankine Cycle (ORC) is investigated. A thermodynamic analysis of the engine’s Brayton cycle is derived to determine the heat source available for exploitation. The aim is to use the aircraft engine fuel as the working fluid of the organic Rankine cycle in order to reduce the extra weight of the waste heat recovery system and keep the thrust-to-weight ratio as high as possible. A surrogate fuel with thermophysical properties similar to aviation gas turbine fuel is used for the ORC simulation. The evaporator design as well as the weight minimisation and safety of the suggested application are the most crucial aspects determining the feasibility of the proposed concept. The results show that there is potential in the exhaust gases to produce up to 50kW of power, corresponding to a 10.1% improvement of the overall thermal efficiency of the engine.

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