Supercritical carbon dioxide Brayton cycle for concentrated solar power

Garg, Pardeep; Kumar, Pramod; Srinivasan, Kandadai

doi:10.1016/j.supflu.2013.01.010

Cited by 173 publications

(78 citation statements)

References 11 publications

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“…Equation (26) represents the thermal energy conservation of TSS. Equation (27) represents the heat loss.…”

Section: T H T T T H T T W Tmentioning

confidence: 99%

“…In the past few decades there has been a spurt in research reporting interesting results on the choice of working fluids for organic Rankine cycle-based power generation [26][27][28][29]. However, the integration of a solar field with supercritical CO2 Brayton power cycles can achieve a high level of thermal efficiency due to the high solar concentration ratio associated with solar central receiver systems [30].…”

Section: Introductionmentioning

confidence: 99%

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A Residential Energy Hub Model with a Concentrating Solar Power Plant and Electric Vehicles

Wen

Liu

et al. 2017

Energies

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Abstract:Renewable energy generation and electric vehicles (EVs) have attracted much attention in the past decade due to increasingly serious environmental problems as well as less and less fossil energy reserves. Moreover, the forms of energy utilization are changing with the development of information technology and energy technology. The term "energy hub" has been introduced to represent an entity with the capability of energy production, conversion and storage. A residential quarter energy-hub-optimization model including a concentrating solar power (CSP) unit is proposed in this work, with solar energy and electricity as its inputs to supply thermal and electrical demands, and the operating objective is to minimize the involved operation costs. The optimization model is a mixed integer linear programming (MILP) problem. Demand side management (DSM) is next implemented by modeling shiftable electrical loads such as EVs and washers, as well as flexible thermal loads such as hot water. Finally, the developed optimization model is solved with the commercial CPLEX solver based on the YALMIP/MATLAB toolbox, and sample examples are provided for demonstrating the features of the proposed method.

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“…Equation (26) represents the thermal energy conservation of TSS. Equation (27) represents the heat loss.…”

Section: T H T T T H T T W Tmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Residential Energy Hub Model with a Concentrating Solar Power Plant and Electric Vehicles

Wen

Liu

et al. 2017

Energies

View full text Add to dashboard Cite

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“…For example, its critical condition is easy to reach and it is an environmentally friendly working fluid, which makes SCO 2 safe and cheap for industrial use [2]. The most useful advantages of SCO 2 are its high density, low viscosity, and large pressure increase with small enthalpy increase, which result in high efficiency, compact mechanical structure, and a larger pressure ratio with smaller input power in the centrifugal compressor [3][4][5]. The research on SCO 2 has gradually been increasing lately.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Unsteady Flow Characteristics of a SCO2 Centrifugal Compressor

et al. 2017

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Supercritical carbon dioxide (SCO 2 ) is a vital working fluid in the application of power units and its high density helps to achieve a compact mechanical structure. Centrifugal compressors are of vital use in various kinds of equipment. In this paper, a SCO 2 centrifugal compressor of large input power and mass flow rate is designed and numerically investigated. A thorough numerical analysis of the unsteady flow field in the centrifugal compressor is performed in ANSYS-CFX. The computation adopts hexahedral mesh, finite volume method, and the RNG k-ε two-equation turbulence model. Streamlines, temperature, pressure, and Mach number distributions at different time steps in one revolution period are covered to present the unsteady effect of turbomachinery. Meanwhile, the force on a single rotor blade is monitored to investigate the frequency components of exciting force, thus providing the foundation for vibration analysis. Moreover, the torque, output power, pressure ratio, and isentropic efficiency in the steady and the unsteady time-averaged condition are calculated and compared with the design condition to measure the validity of the design. In summary, the unsteady computation result reveals that the unsteady flow characteristics are prominent in the designed compressor and the design of impeller and diffuser meet the requirement.

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“…2, enthalpy ratio for sCO 2 (defined as the rate between turbine enthalpy drop and compressor enthalpy rise) is around 3.5 to 4 times bigger than compressor enthalpy change at low temperatures and it can reach a ratio of 7 for higher temperatures. Therefore, turbine can produce 7 times more energy than the consumed by the compressor [10]. However, enthalpy ratios below 2.5 are the common practice for air Brayton cycles.…”

Section: Introductionmentioning

confidence: 99%