Optimization of the self-condensing CO2 transcritical power cycle using solar thermal energy

Pan, Lisheng; Li, Bing; Shi, Weixiu; Wei, Xiaolin

doi:10.1016/j.apenergy.2019.113608

Cited by 45 publications

(7 citation statements)

References 26 publications

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“…The comparison between basic, recuperator, reheat, and regenerative systems for transcritical CO 2 power cycle demonstrated that reheat transcritical CO 2 cycle is the best one, concerning thermoeconomic performance, and reheat system showed an increase in net power produced, energy efficiency, and efficiency of exergy compared the basic transcritical CO 2 cycle while the total investment cost is higher for reheat system due to largest heat transfer area [17]. Condensing is one of the problems facing the conventional CO 2 trans-and subcritical CO 2 power cycles by using traditional water cooling, but with self-condensing, the CO 2 carbon dioxide transcritical power cycle overcome this problem and can operate well with the cooling water as warm as 30 8C [18,19]. The CO 2 transcritical power cycle has a better economic performance than the organic Rankine cycle in terms of cost per net power output and under a certain turbine inlet pressure.…”

Section: Introductionmentioning

confidence: 99%

Effect of high temperatures on the efficiency of sub-critical CO2 cycle

Ahmed

Imre

2021

Pollack

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Thermodynamic efficiency is a crucial factor of a power cycle. Most of the studies indicated that efficiency increases with increasing heat source temperature, regardless of heat source type. Although this assumption generally is right, when the heat source temperature is close to the critical temperature, increasing the heat source temperature can decrease efficiency. Therefore, in some cases, the increase in the source temperature, like using improved or more collectors for a solar heat source can have a double negative effect by decreasing efficiency while increasing the installation costs. In this paper, a comparison of the CO2 subcritical cycle and the Trilateral Flash Cycle will be presented to show the potential negative effect of heat source temperature increase.

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Section: Introductionmentioning

confidence: 99%

Effect of high temperatures on the efficiency of sub-critical CO2 cycle

Ahmed

Imre

2021

Pollack

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“…In addition, the higher fluid density of supercritical CO 2 and the lower volume ratio in the expansion process permits the efficient and compact turbomachinery design.The critical pressure of CO 2 is 7.38 MPa. Considering the conventional cooling water condition, the heat rejection pressure of CO 2 -TC is just slightly lower than the critical pressure [2]. Therefore, the pressure ratio of CO 2 -TC and CO 2 -SC is limited since the high pressure may threaten the safety of the system.…”

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confidence: 99%

Optimization and Comparison of Two Combined Cycles Consisting of CO2 and Organic Trans-Critical Cycle for Waste Heat Recovery

Ren

Wang

2020

Energies

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CO2-based trans-critical and supercritical cycles have received more and more attention for power generation in many applications such as solar and nuclear energy due to the desirable thermal stability and properties of CO2 and the high efficiency and compact size of the plant. In this study, two combined cycles driven by the flue gas exhausted from the LM2500+ gas turbine, CO2-TC+OTC (organic trans-critical cycle) and CO2-TC/OTC, which can achieve a good trade-off between thermal efficiency and utilization of the waste heat, are investigated. Parameters optimization is carried out by means of genetic algorithm to maximize the net power output of the combined cycle and the effects of the key parameters on the cycle performance are examined. Results show that the exergy efficiency of CO2-TC+OTC is about 2% higher than that of CO2-TC/OTC. In CO2-TC+OTC, the recuperation process of CO2 causes the largest exergy loss; in CO2-TC/OTC, the largest exergy loss occurs in the heat recovery vapor generator, followed by the intermediate heat exchanger due to the larger variation of the specific heat capacity of CO2 and organic fluid in the heat addition process.

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“…24 As a sustainable and cleaner way of energy generation, solarassisted tCO 2 -RC has also been attracting the attention of the researchers. 26 Pan et al 22 performed a theoretical study in order to investigate the effects of operation parameters on the solarassisted tCO 2 -RC. One of them was performed by Song et al, 25 utilizing solar energy to drive a tCO 2 -RC.…”

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confidence: 99%

“…Over the past two decades, there has been a substantial number of studies on transcritical CO 2 (tCO 2 ) Rankine cycles (RCs) for low-grade heat conversion to power. Various cycle configurations using tCO 2 have been examined powered by different thermal energy resources, ie, waste heat recovery from engine, 19 waste heat recovery from a gas turbine, 20 geothermal energy, 21 solar energy with molten salt energy storage, 22 solar energy with LNG cold recovery, 23 and electro-thermal energy storage. 24 As a sustainable and cleaner way of energy generation, solarassisted tCO 2 -RC has also been attracting the attention of the researchers.…”

mentioning

confidence: 99%

“…In another study, the research group conducted an exergy analysis and optimization procedure for the same cycle integrated with the hydrogen production process. 26 Pan et al 22 performed a theoretical study in order to investigate the effects of operation parameters on the solarassisted tCO 2 -RC. A molten salt energy storage medium was integrated into the solar energy system.…”

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confidence: 99%

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Experimental investigation of solar‐assisted transcritical CO ₂ Rankine cycle for summer and winter conditions from exergetic point of view

2019

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This study deals with energy and exergy analysis of the experimental solarassisted Rankine cycle working with an environmentally friendly working fluid transcritical CO 2 . The experimental system consists of evacuated solar collectors, a heat recovery system, condenser, a pump, and an expansion valve to simulate the realistic turbine operation. The system was designed for electricity production and the heat supply for various applications. The experiments were made funder typical winter and summer days to evaluate seasonal system performance in Kyoto, Japan. According to the obtained results, the turbine capacity was calculated as 0.118 kW and 0.177 kW for winter and summer seasons.From the exergetic point of view, solar collectors were found to be the major contributor to the total exergy destruction with 96.32% for summer and 93.58% for the winter season. Therefore, the efforts should be focused on the collectors. Thus, any attempt for improving the system performance should be focused on solar collectors first. Furthermore, the exergetic efficiency of the overall system was calculated as 7.63% for the winter season and 4.08% for the summer season. As a result, the utilization of CO 2 in the energy conversion cycle can be sustainably developed and extended by providing a glimpse into the carbon-free clean energy future.

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Optimization of the self-condensing CO2 transcritical power cycle using solar thermal energy

Cited by 45 publications

References 26 publications

Effect of high temperatures on the efficiency of sub-critical CO2 cycle

Effect of high temperatures on the efficiency of sub-critical CO2 cycle

Optimization and Comparison of Two Combined Cycles Consisting of CO2 and Organic Trans-Critical Cycle for Waste Heat Recovery

Experimental investigation of solar‐assisted transcritical CO ₂ Rankine cycle for summer and winter conditions from exergetic point of view

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Optimization of the self-condensing CO2 transcritical power cycle using solar thermal energy

Cited by 45 publications

References 26 publications

Effect of high temperatures on the efficiency of sub-critical CO2 cycle

Effect of high temperatures on the efficiency of sub-critical CO2 cycle

Optimization and Comparison of Two Combined Cycles Consisting of CO2 and Organic Trans-Critical Cycle for Waste Heat Recovery

Experimental investigation of solar‐assisted transcritical CO 2 Rankine cycle for summer and winter conditions from exergetic point of view

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Experimental investigation of solar‐assisted transcritical CO ₂ Rankine cycle for summer and winter conditions from exergetic point of view