Performance study of a transcritical carbon dioxide cycle with an expressor

Energy ◽  
2013 ◽  
Vol 60 ◽  
pp. 77-86 ◽  
Author(s):  
Sun Zhili ◽  
Li Minxia ◽  
Han Guangming ◽  
Ma Yitai
Keyword(s):  
Carbon Dioxide ◽  
Performance Study ◽  
Transcritical Carbon Dioxide

Two-stage transcritical carbon dioxide cycle optimisation: A theoretical and experimental analysis

2005 ◽  
Vol 28 (8) ◽  
pp. 1274-1283 ◽  
Author(s):  
Alberto Cavallini ◽  
Luca Cecchinato ◽  
Marco Corradi ◽  
Ezio Fornasieri ◽  
Claudio Zilio
Keyword(s):  
Carbon Dioxide ◽  
Experimental Analysis ◽  
Two Stage ◽  
Transcritical Carbon Dioxide

Study on Cooling Heat Transfer of Supercritical Carbon Dioxide Applied to Transcritical Carbon Dioxide Heat Pump

2021 ◽  
pp. 451-493
Author(s):  
Chaobin Dang ◽  
Eiji Hihara
Keyword(s):  
Heat Transfer ◽  
Carbon Dioxide ◽  
Heat Pump ◽  
Supercritical Co2 ◽  
Lubricating Oil ◽  
Cross Sectional ◽  
Pump System ◽  
Heat Pump System ◽  
Transcritical Carbon Dioxide ◽  
Supercritical Water Cooled Reactor

Understanding the heat transfer characteristics of supercritical fluids is of fundamental importance in many industrial processes such as transcritical heat pump system, supercritical water-cooled reactor, supercritical separation, and supercritical extraction processes. This chapter addresses recent experimental, theoretical, and numerical studies on cooling heat transfer of supercritical CO2. A systematic study on heat transfer coefficient and pressure drop of supercritical CO2 was carried out at wide ranges of tube diameter, mass flux, heat flux, temperature, and pressure. Based on the understanding of temperature and velocity distributions at cross-sectional direction provided by the numerical simulation, a new prediction model was proposed, which agreed well with the experimental results. In addition, the effect of lubricating oil was also discussed with the focus on the change in flow pattern and heat transfer performance of oil and supercritical CO2.

Optimization of two-stage transcritical carbon dioxide heat pump cycles

2007 ◽  
Vol 46 (2) ◽  
pp. 180-187 ◽  
Author(s):  
Neeraj Agrawal ◽  
Souvik Bhattacharyya ◽  
J. Sarkar
Keyword(s):  
Carbon Dioxide ◽  
Heat Pump ◽  
Two Stage ◽  
Transcritical Carbon Dioxide

Thermodynamic Performance Study of the SOFC–GT–RC System Fueled by LNG With CO2 Recovery

2019 ◽  
Vol 141 (12) ◽  
Author(s):  
Xiaoyu Yang ◽  
Hongbin Zhao ◽  
Qinlong Hou
Keyword(s):  
Carbon Dioxide ◽  
Power Efficiency ◽  
Total Power ◽  
Operating Parameters ◽  
Energy Technology ◽  
Performance Study ◽  
Distributed Energy ◽  
Utilization Factor ◽  
Thermodynamic Performance ◽  
Cold Energy

Abstract Distributed energy technology is an important developing direction of the future energy technology. This paper puts forward a distributed energy system named SOFC–GT–RC (solid oxide fuel cell–gas turbine–recovering carbon dioxide) with liquefied natural gas (LNG) as fuel and recovering carbon dioxide. In the system, the cold energy of LNG can not only cool the compressor inlet air to reduce the consumption of compressor work, but also to supply cold energy and to recover CO2. Based on the mathematical model of each part, the thermodynamic calculation model of the whole system is built by fortran, which is embedded in aspen plus. The results of calculation indicate the thermal efficiency and total power efficiency are 74.5% and 56.7% while the exergy efficiency is 61.8%. In addition, some operating parameters such as fuel utilization factor and fuel flow rate are selected. Based on these operating parameters, the new system thermodynamic performance is studied. The results point that this SOFC–GT–RC system fueled by LNG increases the total power and decreases waste of cold energy and the pollution of the environment, which would be an effective utilization style of energy in China's LNG satellite stations.

Theoretical performance of transcritical carbon dioxide cycle with two-stage compression and intercooling

2005 ◽  
Vol 219 (2) ◽  
pp. 187-195 ◽  
Author(s):  
J. S. Baek ◽  
E. A. Groll ◽  
P. B. Lawless
Keyword(s):  
Carbon Dioxide ◽  
System Analysis ◽  
Coefficient Of Performance ◽  
System Efficiency ◽  
Compression Process ◽  
Two Stage ◽  
Bell Curve ◽  
Second Stage ◽  
Transcritical Carbon Dioxide ◽  
Theoretical Performance

A computer model was developed to perform a thermodynamic analysis of the transcritical carbon dioxide cycle with two-stage compression and intercooling. In typical two-stage compression with intercooling applications, the intercooler serves the purpose of cooling the fluid to the lowest possible temperature before it enters the second-stage compressor. This paper presents the results of the system analysis of the transcritical carbon dioxide cycle with two-stage compression and intercooling (intercooler cycle) and identifies the pressure ratios that provide maximum system efficiency. The results show that the coefficient of performance (COP), curves of the intercooler cycle are different from the ‘typical bell curve behaviours’ that are observed when plotting the COP versus the intermediate pressure with assumptions of isentropic and real compression process.

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