scholarly journals The CO2 Transcritical Power Cycle for Low Grade Heat Recovery: Discussion on Temperature Profiles in System Heat Exchangers

2011 ◽  
Author(s):  
Y. Chen ◽  
P. Lundqvist
Keyword(s):  
Carbon Dioxide ◽  
Heat Source ◽  
Temperature Profile ◽  
Supercritical Co2 ◽  
Heat Recovery ◽  
Low Grade ◽  
Power Cycle ◽  
Low Grade Heat ◽  
Cycle Efficiency ◽  
Better Than

Carbon dioxide transcritical power cycle has many advantages in low-grade heat source recovery compared to conventional systems with other working fluids. This is mainly due to the supercritical CO2’s temperature profile can match the heat source temperature profile better than other pure working fluids and its heat transfer performance is better than the fluid mixtures, which enables a better cycle efficiency. Moreover, the specific heat of supercritical CO2 will have sharp variations in the region close to its critical point, which will create a concave shape temperature profile in the heat exchanger that used for recovering heat from low-grade heat sources. This brings more advantage to carbon dioxide transcritical power systems in low-grade heat recovery. This study discusses the advantage of carbon dioxide power system in low-grade heat source recovery by taking this effect into account. A basic carbon dioxide transcritical power system with an Internal Heat Exchanger (IHX) is employed for the analysis and the system performance is also compared with a basic Organic Rankin Cycle (ORC). Software Engineering Equation Solver (EES) and Refprop 7.0 are used for the cycle efficiency and working fluid properties calculations.

Low-Grade Heat Source Utilization by Carbon Dioxide Transcritical Power Cycle

2007 ◽  
Author(s):  
Yang Chen ◽  
Wimolsiri Pridasawas ◽  
Per Lundqvist
Keyword(s):  
Carbon Dioxide ◽  
Dynamic Performance ◽  
Average Power ◽  
Power Production ◽  
Low Grade ◽  
Heat Sources ◽  
Climate Conditions ◽  
Power Cycle ◽  
Transcritical Carbon Dioxide ◽  
Low Grade Heat

One way to reduce the fossil fuel consumption and mitigate environmental impact is to utilize low-grade heat sources for power production. In this paper, a transcritical carbon dioxide power cycle is analyzed for its potential in utilizing the low-grade heat sources. Solar thermal is selected as a representative of low-grade heat sources. TRNSYS 16 and Engineering Equation Solver (EES) are employed using co-solving technique to analyze the dynamic performance of the proposed system. Both daily performance and annual performance of the proposed system under Swedish climate conditions are simulated. The simulation results show that the proposed system can achieve 8% average thermal efficiency and consequently 2.43 kW average power production during the system working period on a randomly selected summer day with a 30 m2 solar collector. Over the whole year, the maximum daily power production is about 17 kWh and the maximum monthly power production is about 185 kWh.

Power-based performance comparison between carbon dioxide and R125 transcritical cycles for a low-grade heat source

2011 ◽  
Vol 88 (3) ◽  
pp. 892-898 ◽  
Author(s):  
Young-Jin Baik ◽  
Minsung Kim ◽  
Ki Chang Chang ◽  
Sung Jin Kim
Keyword(s):  
Carbon Dioxide ◽  
Heat Source ◽  
Performance Comparison ◽  
Low Grade ◽  
Low Grade Heat

Thermodynamic analysis of a Kalina-based combined cooling and power cycle driven by low-grade heat source

2017 ◽  
Vol 111 ◽  
pp. 8-19 ◽  
Author(s):  
Liyan Cao ◽  
Jiangfeng Wang ◽  
Hongyang Wang ◽  
Pan Zhao ◽  
Yiping Dai
Keyword(s):  
Heat Source ◽  
Thermodynamic Analysis ◽  
Low Grade ◽  
Power Cycle ◽  
Low Grade Heat ◽  
Combined Cooling
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