Performance evaluation of a low-grade power generation system with CO2 transcritical power cycles

Ge, Y.T.; Li, Liang; Luo, Xianglong; Tassou, S.A.

doi:10.1016/j.apenergy.2017.07.086

Cited by 42 publications

(12 citation statements)

References 21 publications

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“…Finally, Ge et al [43] studied experimentally a CTPC system with a single-stage axial CO2 turbine rated at 5 kW for WHR from an 80 kW micro-turbine CHP unit, while Pan et al [44] established a CTPC test-rig using an electric heater and specifically focused on the design and testing of a 2 kW rolling piston expander, with the heat source (thermal oil) temperature kept below 200 ºC, which is different from the conditions expected in engine exhaust-gas streams. with both a recuperator and a preheater (PR-CTPC).…”

Section: State-of-art Of Co2 As a Working Fluidmentioning

confidence: 93%

Potential of carbon dioxide transcritical power cycle waste-heat recovery systems for heavy-duty truck engines

Tian

Zhao

et al. 2019

Applied Energy

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Carbon dioxide transcritical power cycle (CTPC) systems are considered a new and particularly interesting technology for waste-heat recovery. In heavy-duty truck engine applications, challenges arise from the highly transient nature of the available heat sources. This paper presents an integrated model of CTPC systems recovering heat from a truck diesel engine, developed in GT-SUITE software and calibrated against experimental data, considers the likely fuel consumption improvements and identifies directions for further improvement. The transient performance of four different CTPC systems is predicted over a heavy-heavy duty driving cycle with a control structure comprising a mode switch module and two PID controllers implemented to realize stable, safe and optimal operation. Three operating modes are defined: startup mode, power mode, and stop mode. The results demonstrate that CTPC systems are robust and able to operate safely even when the heat sources are highly transient, indicating a promising potential for the deployment of this technology in such applications. Furthermore, a system layout with both a preheater and a recuperator appears as the most promising, allowing a 2.3% improvement in brake thermal efficiency over the whole driving cycle by utilizing 48.9% of the exhaust and 72.8% of the coolant energy, even when the pump and turbine efficiencies are as low as 50%. Finally, factor analysis suggests that important directions aimed at improving the performance and facilitating CTPC system integration with vehicle engines are: 1) ensuring long-duration operation in power mode, e.g., by employment in long-haul trucks; and 2) enhancing pump and turbine performance.

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Section: State-of-art Of Co2 As a Working Fluidmentioning

confidence: 93%

Potential of carbon dioxide transcritical power cycle waste-heat recovery systems for heavy-duty truck engines

Tian

Zhao

et al. 2019

Applied Energy

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“…A test facility was built for investigation on small-scale transcritical CO 2 Rankine cycles by Ge et al [48]. It comprises an 80 kW micro-turbine CHP unit, an oil loop, a Rankine engine with integrated recuperator, and a dry cooling system.…”

Section: Transcritical Co 2 Rankine Cyclementioning

confidence: 99%

“…Ge et al [48] evaluated experimental performances of a low-grade heat driven CO 2 transcritical cycle and few results were obtained. Tests results showed a correlation between CO 2 cycle mass flow rate and turbine's inlet and outlet pressures and subsequently with the generated power.…”

Section: Transcritical Co 2 Rankine Cyclementioning

confidence: 99%

Review of Experimental Research on Supercritical and Transcritical Thermodynamic Cycles Designed for Heat Recovery Application

et al. 2019

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Supercritical operation is considered a main technique to achieve higher cycle efficiency in various thermodynamic systems. The present paper is a review of experimental investigations on supercritical operation considering both heat-to-upgraded heat and heat-to-power systems. Experimental works are reported and subsequently analyzed. Main findings can be summarized as: steam Rankine cycles does not show much studies in the literature, transcritical organic Rankine cycles are intensely investigated and few plants are already online, carbon dioxide is considered as a promising fluid for closed Brayton and Rankine cycles but its unique properties call for a new thinking in designing cycle components. Transcritical heat pumps are extensively used in domestic and industrial applications, but supercritical heat pumps with a working fluid other than CO2 are scarce. To increase the adoption rate of supercritical thermodynamic systems further research is needed on the heat transfer behavior and the optimal design of compressors and expanders with special attention to the mechanical integrity.

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“…The CO2 based transcritical thermodynamic cycles (T-CO2) is found more suitable for generating power from heat source [6]. One of the known method for utilising waste heat of a system is by use of an Organic Rankine Cycles (ORC) based system.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Two Medium-Grade Power Generation Systems with CO2 Based Transcritical Rankine Cycle (CTRC)

Sajwan

Sharma

Shukla

2021

DGAEJ

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As CO2 is emerging as an environment friendly working fluid its application in high temperature engine’s waste heat recovery systems is found to be more suitable than other hydrocarbons. This paper presents a performance comparison of two systems based on transcritical Rankine cycle using CO2 as working fluid. A heavy-duty truck is opted for analysis in which coolant is used to preheat CO2 and further the engine exhaust is used to transfer the heat to main heater. The System-1 and System-2 having single and dual loop based transcritical Rankine cycle are analysed. The independent parameters taken for the investigative analysis are turbine inlet temperature (TIT), pressure ratio and effectiveness of heat exchangers. Comparison results show that System-2 is producing 11.8 kW more power than system-1 at 12 MPa pressure ratio and at 489°C TIT. However, under same conditions, system-1 is having 16.88% of thermal efficiency which is higher than system-2 by around 3%. Further, the Engine coolant utilization rates when compared are nearly same in both the systems, the exhaust gas utilization rate came out higher for System-2. In respect of exergy destruction, system-1 shows maximum destruction in regenerator and System-2 in heater-2.

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Performance evaluation of a low-grade power generation system with CO2 transcritical power cycles

Cited by 42 publications

References 21 publications

Potential of carbon dioxide transcritical power cycle waste-heat recovery systems for heavy-duty truck engines

Potential of carbon dioxide transcritical power cycle waste-heat recovery systems for heavy-duty truck engines

Review of Experimental Research on Supercritical and Transcritical Thermodynamic Cycles Designed for Heat Recovery Application

Performance Evaluation of Two Medium-Grade Power Generation Systems with CO2 Based Transcritical Rankine Cycle (CTRC)

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