Comparative double and integer optimization of low-grade heat recovery from PEM fuel cells employing an organic Rankine cycle with zeotropic mixtures

2021 ◽  
Vol 228 ◽  
pp. 113695
Author(s):  
Iman Fakhari ◽  
Amirmohammad Behzadi ◽  
Ehsan Gholamian ◽  
Pouria Ahmadi ◽  
Ahmad Arabkoohsar
Keyword(s):  
Fuel Cells ◽  
Heat Recovery ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Pem Fuel Cells ◽  
Low Grade ◽  
Integer Optimization ◽  
Low Grade Heat

Low Temperature Heat Recovery Through Integration of Organic Rankine Cycle and CO2 Removal Systems in a NGCC

2014 ◽  
Author(s):  
Vittorio Tola ◽  
Matthias Finkenrath
Keyword(s):  
Low Temperature ◽  
Heat Recovery ◽  
Power Plants ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Low Grade ◽  
Co2 Removal ◽  
Temperature Heat ◽  
Temperature Levels ◽  
Low Grade Heat

Reducing carbon dioxide (CO2) emissions from power plants utilizing fossil fuels is expected to become substantially more important in the near- to medium-term due to increasing costs associated to national and international greenhouse gas regulations, such as the Kyoto protocol and the European Union Emission Trading Scheme. However, since net efficiency penalties caused by capturing CO2 emissions from power plants are significant, measures to reduce or recover efficiency losses are of substantial interest. For a state-of-the-art 400 MW natural gas-fueled combined cycle (NGCC) power plant, post-combustion CO2 removal based on chemical solvents like amines is expected to reduce the net plant efficiency in the order of 9–12 percentage points at 90% overall CO2 capture. A first step that has been proposed earlier to improve the capture efficiency and reduce capture equipment costs for NGCC is exhaust gas recirculation (EGR). An alternative or complementary approach to increase the overall plant efficiency could be the recovery of available low temperature heat from the solvent-based CO2 removal systems and related process equipment. Low temperature heat is available in substantial quantities in flue gas coolers that are required upstream of the CO2 capture unit, and that are used for exhaust gas recirculation, if applied. Typical temperature levels are in the order of 80°C or up to 100 °C on the hot end. Additional low-grade heat sources are the amine condenser which operates at around 100–130 °C and the amine reboiler water cooling that could reach temperatures of up to 130–140°C. The thermal energy of these various sources could be utilized in a variety of low-temperature heat recovery systems. This paper evaluates heat recovery by means of an Organic Rankine Cycle (ORC) that — in contrast to traditional steam Rankine cycles — is able to convert heat into electricity efficiently even at comparably low temperatures. By producing additional electrical power in the heat recovery system, the global performance of the power plant can be further improved. This study indicates a theoretical entitlement of up to additional 1–1.5 percentage points in efficiency that could be gained by integrating ORC technology with a post-combustion capture system for natural gas combined cycles. The analysis is based on fundamental thermodynamic analyses and does not include an engineering- or component-level design and feasibility analysis. Different ORC configurations have been considered for thermal energy recovery at varying temperature levels from the above-mentioned sources. The study focuses on simultaneous low-grade heat recovery in a single ORC loop. Heat recovery options that are discussed include in series, in parallel or cascaded arrangements of heat exchangers. Different organic operating fluids, including carbon dioxide, R245fa, and N-butane were considered for the analysis. The ORC performance was evaluated for the most promising organic working fluid by a parametric study. Optimum cycle operating temperatures and pressures were identified in order to evaluate the most efficient approach for low temperature heat recovery.

scholarly journals Comparison study of Trilateral Rankine Cycle, Organic Flash Cycle and basic Organic Rankine Cycle for low grade heat recovery

2017 ◽  
Vol 142 ◽  
pp. 1441-1447 ◽  
Author(s):  
Zhi Li ◽  
Yiji Lu ◽  
Yuqi Huang ◽  
Gao Qian ◽  
Fenfang Chen ◽  
...  
Keyword(s):  
Heat Recovery ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Low Grade ◽  
Comparison Study ◽  
Low Grade Heat

Contribution of Metal-Organic-Heat Carrier nanoparticles in a R245fa low-grade heat recovery Organic Rankine Cycle

2019 ◽  
Vol 199 ◽  
pp. 111960 ◽  
Author(s):  
G. Cavazzini ◽  
S. Bari ◽  
P. McGrail ◽  
V. Benedetti ◽  
G. Pavesi ◽  
...  
Keyword(s):  
Heat Carrier ◽  
Heat Recovery ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Low Grade ◽  
Metal Organic ◽  
Low Grade Heat

Demonstration of 10- W p micro organic Rankine cycle generator for low-grade heat recovery

Energy ◽  
2014 ◽  
Vol 78 ◽  
pp. 806-813 ◽  
Author(s):  
Noboru Yamada ◽  
Yoshihito Tominaga ◽  
Takanori Yoshida
Keyword(s):  
Heat Recovery ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Low Grade ◽  
Low Grade Heat

scholarly journals A low-grade heat Organic Rankine Cycle driven by hybrid solar collectors and a waste heat recovery system

2020 ◽  
Vol 6 ◽  
pp. 3425-3445
Author(s):  
Mohamed R. Gomaa ◽  
Ramadan J. Mustafa ◽  
Mujahed Al-Dhaifallah ◽  
Hegazy Rezk
Keyword(s):  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Low Grade ◽  
Waste Heat Recovery System ◽  
Recovery System ◽  
Heat Recovery System ◽  
Low Grade Heat

Thermodynamic analysis and optimization of a partial evaporating dual-pressure organic rankine cycle system for low-grade heat recovery

2020 ◽  
pp. 116363
Author(s):  
Dantong Li ◽  
Zhilong He ◽  
Qi Wang ◽  
Xiaolin Wang ◽  
Weifeng Wu ◽  
...  
Keyword(s):  
Thermodynamic Analysis ◽  
Heat Recovery ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Low Grade ◽  
Cycle System ◽  
Low Grade Heat

A study on optimal composition of zeotropic working fluid in an Organic Rankine Cycle (ORC) for low grade heat recovery

Energy ◽  
2017 ◽  
Vol 123 ◽  
pp. 326-339 ◽  
Author(s):  
K. Satanphol ◽  
W. Pridasawas ◽  
B. Suphanit
Keyword(s):  
Heat Recovery ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Low Grade ◽  
Optimal Composition ◽  
Low Grade Heat

Small scale Organic Rankine Cycle testing for low grade heat recovery by using refrigerants as working fluids

2018 ◽  
Vol 79 (3) ◽  
pp. 70-78
Author(s):  
Emanuele Fanelli ◽  
Simone Braccio ◽  
Giuseppe Pinto ◽  
Giacinto Cornacchia ◽  
Giacobbe Braccio
Keyword(s):  
Heat Recovery ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Small Scale ◽  
Low Grade ◽  
Working Fluids ◽  
Low Grade Heat
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