Advanced Low Pressure Cycle for Concentrated Solar Power Generation

Garg, Pardeep; Krishna, S.; Kumar, Pramod; Conboy, Thomas M; Ho, Clifford K.

doi:10.1115/es2014-6545

Cited by 3 publications

(3 citation statements)

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“…R. V. et al modified three sCO 2 power cycles including SC, RC, IC by bringing in an ejector before the heater to reduce the pressure at the solar receiver, constituting three new sCO 2 power cycles, namely, simple recuperated cycle assisted by ejector (SC‐EJ), intercooling cycle assisted by ejector (IC‐EJ), recompression cycle assisted by ejector (RC‐EJ). Pardeep Garg et al designed a combination bifurcation with an intercooler cycle (CBI) operating between turbine pressures of 15 and 2.6 MPa without performance penalty . The schematics of the sCO 2 power cycles are illustrated in Figure .…”

Section: Power Cycles Based On Sco2mentioning

confidence: 99%

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Review of supercritical CO₂power cycles integrated with CSP

Yin

Zheng²,

Peng

et al. 2019

Int J Energy Res

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Summary Increasing demand of electricity and severer concerns to environment call for green energy sources as well as efficient energy conversion systems. SCO2 power cycles integrated with concentrating solar power (CSP) are capable of enhancing the competitiveness of thermal solar electricity. This article makes a comprehensive review of supercritical CO2 power cycles integrated with CSP. A detailed comparison of four typical CSP technologies is conducted, and the cost challenge of currently CSP technologies is pointed out. The thermophysical properties of sCO2 and the corresponding two real gas effects are analyzed elaborately to express the features of sCO2 power cycles. An extensive review of sCO2 layouts relevant for CSP including 12 single layouts and 1 combined layout is implemented logically. Strengths and weaknesses of sCO2 power cycles over traditional steam‐Rankine cycle generally adopted in current CSP plants are concluded, followed by metal material degration summary in CSP relevant temperature sCO2 environment, which shows that the nickel‐based alloy is a proper structural material candidate for sCO2‐CSP integration. Thermodynamic analyses of sCO2 power cycles when integrated with CSP are divided into three level of which design‐point analysis and off‐design modeling are conducted and compared, more researches into the off‐design point analysis, dynamic modeling, especially the transient behavior are suggested. Economic analysis of the integrated system is concluded and presents a considerable levelized cost of electricity reduction of 15.6% to 67.7% compared to that of state of art CSP. Taking the thermodynamic and economic analysis into consideration, target designs of sCO2 power cycles for CSP are summarized in three aspects. Finally, current theoretical and experimental researches of sCO2 power cycles integrated with CSP for market penetration are introduced. The strengths, weaknesses, and potential solutions to the gaps of three potential pathways (molten salt pathway, particle pathway, and gas phase pathway) to realize the integration of sCO2 power cycles in the next CSP generation plants up to 700°C are reviewed. In general, the integration of sCO2 power cycles with CSP technologies exhibits promising expectations for facilitating the competitiveness of thermal solar electricity.

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Section: Power Cycles Based On Sco2mentioning

confidence: 99%

“…Pardeep Garg et al designed a combination bifurcation with an intercooler cycle (CBI) operating between turbine pressures of 15 and 2.6 MPa without performance penalty. 58 The schematics of the sCO 2 power cycles are illustrated in Figure 16.…”

Section: Sco 2 Power Cycles Candidate For Csp Plantsmentioning

confidence: 99%

Review of supercritical CO₂power cycles integrated with CSP

Yin

Zheng²,

Peng

et al. 2019

Int J Energy Res

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“…Redesigning the thermodynamic cycle in such a way that the optimum efficiencies of 45% are obtained at 150 bar (15 MPa) turbine inlet pressure can bring down the cost associated with the power block. In this regard, a new cycle known as CBI cycle was analyzed and found to offer efficiencies as high as the s-CO 2 cycle but at lower high side pressures [24]. Since this cycle involves condensation during the heat rejection process, CO 2 is not a suitable candidate for this cycle owing to its low critical temperature (31 C).…”

Section: Combination Bifurcation Withmentioning

confidence: 99%

Technoeconomic Analysis of Alternative Solarized s-CO2 Brayton Cycle Configurations

Carlson

Garg

et al. 2016

Journal of Solar Energy Engineering

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This paper evaluates cost and performance tradeoffs of alternative supercritical carbon dioxide (s-CO2) closed-loop Brayton cycle configurations with a concentrated solar heat source. Alternative s-CO2 power cycle configurations include simple, recompression, cascaded, and partial cooling cycles. Results show that the simple closed-loop Brayton cycle yielded the lowest power-block component costs while allowing variable temperature differentials across the s-CO2 heating source, depending on the level of recuperation. Lower temperature differentials led to higher sensible storage costs, but cycle configurations with lower temperature differentials (higher recuperation) yielded higher cycle efficiencies and lower solar collector and receiver costs. The cycles with higher efficiencies (simple recuperated, recompression, and partial cooling) yielded the lowest overall solar and power-block component costs for a prescribed power output.

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