How to select regenerative configurations of CO 2 transcritical Rankine cycle based on the temperature matching analysis

2020 ◽  
Vol 44 (4) ◽  
pp. 2560-2579
Author(s):  
Hua Tian ◽  
Zhiqiang Xu ◽  
Peng Liu ◽  
Xuan Wang ◽  
Gequn Shu
Keyword(s):  
Rankine Cycle ◽  
Transcritical Rankine Cycle

Configurations selection maps of CO 2 -based transcritical Rankine cycle (CTRC) for thermal energy management of engine waste heat

2017 ◽  
Vol 186 ◽  
pp. 423-435 ◽  
Author(s):  
Gequn Shu ◽  
Lingfeng Shi ◽  
Hua Tian ◽  
Shuai Deng ◽  
Xiaoya Li ◽  
...  
Keyword(s):  
Energy Management ◽  
Thermal Energy ◽  
Waste Heat ◽  
Rankine Cycle ◽  
Transcritical Rankine Cycle

Thermodynamic Analysis of Low-Temperature Power Generation Transcritical Rankine Cycle With R41 and CO2

2014 ◽  
Author(s):  
Jixiang Liao ◽  
Qun Zheng
Keyword(s):  
Power Generation ◽  
Renewable Energy ◽  
Low Temperature ◽  
Rankine Cycle ◽  
Second Law ◽  
Average Value ◽  
Comprehensive Performance ◽  
Lower Temperature ◽  
Net Power Output ◽  
Transcritical Rankine Cycle

The performances of the transcritical Rankine cycles using R41 and CO2 as working fluids for power generation with lower temperature renewable energy are analyzed respectively and presented in this paper. The results show that the R41 cycle displays better comprehensive performance than that of the CO2 cycle. Compared with the CO2 cycle under the same specified conditions, the average value of the maximum net power output increased by more than 52.6%, the optimum inlet pressure decreased by over 41.6% and the second law efficiency increased by 24.8%. Moreover, the system thermal efficiency of R41 cycle is slightly higher than that of the CO2 cycle.

Experimental investigation of a CO2-based Transcritical Rankine Cycle (CTRC) for exhaust gas recovery

Energy ◽  
2018 ◽  
Vol 165 ◽  
pp. 1149-1159 ◽  
Author(s):  
Lingfeng Shi ◽  
Gequn Shu ◽  
Hua Tian ◽  
Guangdai Huang ◽  
Xiaoya Li ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Rankine Cycle ◽  
Exhaust Gas ◽  
Gas Recovery ◽  
Transcritical Rankine Cycle

Analysis and Optimization of an Ammonia Based Transcritical Rankine Cycle for Power Generation

2008 ◽  
Author(s):  
Jahar Sarkar ◽  
Souvik Bhattacharyya
Keyword(s):  
Power Generation ◽  
Low Temperature ◽  
Thermal Efficiency ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Heat Sources ◽  
High Side ◽  
Water Based ◽  
Temperature Heat ◽  
Transcritical Rankine Cycle

This study presents the potential of ammonia as a working fluid in transcritical Rankine cycle for power generation using both high and low temperature heat sources. Higher heat capacity value and superior heat transfer properties of ammonia compared to water are the motivating factors behind its use as a working fluid. A thermodynamic analysis for the ammonia based transcritical Rankine cycle and its comparison with the water based Rankine cycle is presented. Analyses with several cycle modifications are also presented to study the thermal efficiency augmentation. It is observed that an optimum high side pressure exists for near critical operation. In case of low temperature heat sources such as solar energy or waste heat, where water based systems are not suitable, ammonia based Rankine cycle is applicable with attractive thermal efficiency, although cycle modification is not possible. The results with high temperature heat source such as boiler or nuclear reactor, where the turbine outlet is in superheated zone, show that simple ammonia systems yield lower efficiency than water, although a recompression cycle with regenerative heat exchangers exhibits higher efficiency than water. Significant thermal efficiency improvement can be achieved by increasing the high side cycle pressure. Recompression Rankine cycle can be a potential alternative with proper design measures taken to avoid toxicity and flammability.

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