Abstract
This study introduces and evaluates an innovative combined cooling, heating, and power (CCHP) system integrating a gas turbine cycle with transcritical and supercritical CO2 cycles, a high-pressure steam cycle, a Goswami cycle, and a heating terminal. The primary objective is to enhance the thermodynamic efficiency and reduce the environmental impact of power generation. Through detailed exergy and energy analyses, we assessed the system’s performance and compared it with traditional energy systems. The methodology included evaluating the irreversibility within each component, particularly highlighting the gas turbine cycle’s significant share of irreversibility at 67% and the chamber’s highest exergy destruction. Our findings reveal that the integrated system achieves total energy, exergy, and electrical efficiencies of 68.83%, 34.63%, and 33.55%, respectively, while significantly reducing CO2 emissions to 0.298 kgCO2/kWh—outperforming coal, oil, and natural gas power plants in environmental sustainability. Furthermore, the integrated CCHP system showcases superior thermodynamic performance by achieving higher efficiency rates compared to existing solutions detailed in recent studies, thereby marking a significant step forward in the development of sustainable power generation technologies. This research underscores the potential of integrating transcritical and supercritical CO2 cycles with gas turbines to meet energy demands more efficiently and eco-consciously.
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Abbreviations
- a, b :
-
Constants of the equation of state
- \({\dot{C}}_{{\text{flow}}}\) :
-
Annual net cash inflow
- D :
-
Diameter
- e :
-
Specific exergy
- \(\dot{E}\) :
-
Exergy rate
- F :
-
Molar flow rate
- h :
-
Enthalpy
- L :
-
Length
- \(\dot{m}\) :
-
Mass flow rate
- m :
-
Interest rate
- n :
-
Plant lifetime
- \({{\text{Oil}}}_{{\text{s}}}\) :
-
Amount of saved oil
- P :
-
Pressure
- \(\dot{Q}\) :
-
Heat rate
- R :
-
Universal gas constant
- \({R}_{{\text{CO}}_{2}<}\) :
-
Reduction in CO2 emission
- s :
-
Entropy
- T :
-
Temperature
- v :
-
Molar volume
- \(\dot{W}\) :
-
Power rate
- x :
-
Mole fraction
- Z :
-
Investment cost
- \(\alpha\) :
-
Alpha function in the equation of state
- \(\propto\) :
-
Maintenance factor
- \(\kappa\) :
-
Function in the equation of state
- \({\varphi }_{{\text{en}}}\) :
-
Energy efficiency
- \({\varphi }_{{\text{el}}}\) :
-
Electrical efficiency
- \({\varnothing }_{{\text{CO}}_{2}}\) :
-
Total CO2 emission
- \(\omega\) :
-
Acentric factor
- \({\Psi }_{{\text{ex}}}\) :
-
Exergy efficiency
- 0:
-
Standard conditions
- c :
-
Critical properties
- C :
-
Compressor
- CH, ch:
-
Chemical
- dest:
-
Destruction
- el:
-
Electrical
- en:
-
Energy
- GT:
-
Gas turbine
- HEX:
-
Heat exchanger
- in:
-
Input
- out:
-
Output
- P :
-
Pump
- PH:
-
Physical
- r :
-
Reduced properties
- T :
-
Turbine
- CCHP:
-
Combined cooling heating and power
- EFD:
-
Exergy flow diagram
- EGR:
-
Exhaust gas recycle ratio
- GPCC:
-
Goswami power and cooling cycle
- GTC:
-
Gas turbine cycle
- HPSC:
-
High-pressure steam cycle
- LEC:
-
Levelized energy cost
- LHV:
-
Lower heating value
- LMTD:
-
Logarithmic mean temperature difference
- NPV:
-
Net present value
- SCRC:
-
Supercritical CO2 Rankine cycle
- SEA:
-
Specific emission analysis
- TAC:
-
Total annual cost
- TCRC:
-
Transcritical CO2 Rankine cycle
- TUCP:
-
Total unit cost of product
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Zhu, C., Zhang, Y., Wang, M. et al. Simulation and comprehensive study of a new trigeneration process combined with a gas turbine cycle, involving transcritical and supercritical CO2 power cycles and Goswami cycle. J Therm Anal Calorim (2024). https://doi.org/10.1007/s10973-024-13182-9
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DOI: https://doi.org/10.1007/s10973-024-13182-9