Thermoeconomic and optimization analyses of direct oxy-combustion supercritical carbon dioxide power cycles with dry and wet cooling

Sleiti, Ahmad K.; Al‐Ammari, Wahib A.; Veselý, Ladislav; Kapat, Jayanta

doi:10.1016/j.enconman.2021.114607

Cited by 31 publications

(13 citation statements)

References 65 publications

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“…In particular, the turbine must be cooled and the recuperator has to withstand high temperatures (up to 750°C). Therefore, as a new approach, it is recommended to develop DOC‐sCO 2 power cycles to operate at TIT within the range of 550–750°C 29,47 . Thus, in this section, the economic performance of the investigated cycles is presented within that range, as shown in Figure 6.…”

Section: Results Of Design Optimization and Off‐design And Discussionmentioning

confidence: 99%

“…78 However, the economic aspects of each wet and dry cooling approach are considerably different; thus, an economic comparison must be conducted to decide the most feasible and efficient method. 47 For the present cycles, the effects of the CIT on the thermal efficiency, exergy efficiency, c p,total , and LCOE of each cycle are presented in Figure 7. For all cycles, the thermal efficiency is improved only by 2% (average) as the CIT decreases from 50 to 33°C.…”

Section: Effect Of Compressor Inlet Temperaturementioning

confidence: 99%

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Comprehensive thermoeconomic, exergoeconomic, and optimization analyses of direct oxy‐combustion supercritical CO₂ intercooled and reheated cycles under design and off‐design conditions

Al‐Ammari

Sleiti

2022

Energy Science & Engineering

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This study presents comprehensive energetic, exergetic, exergoeconomic, and economic (4E) performance analyses for four direct oxy-combustion (DOC) supercritical carbon dioxide (sCO 2 ) power cycles at design, off-design, and part-load conditions. These cycles include the dual recuperator cycle (DRC), intercooling cycle (ICC), partial intercooling cycle (PIC), and reheating cycle (RHC). The analyses were conducted at relatively low turbine inlet temperatures (TIT: 550-750°C) with compressor inlet temperature (CIT) varied from 33°C (wet-cooling) to 50°C (dry-cooling). Furthermore, single-and multiobjective optimization analyses were conducted for each cycle. At design conditions (high-pressure of P c,o = 20 MPa, lowpressure of P c,o = 5.4 MPa, TIT = 750°C, CIT = 50°C [dry-cooling]), the PIC has the highest thermal efficiency (47.78%) compared to 38.36% for DRC, 45.71% for ICC, and 44.39% for RHC. At optimized conditions (P c,o = 30 MPa, P c,o = 8 MPa, TIT = 744°C, CIT = 30°C [wet-cooling]), the ICC shows superior energetic performance (52.08%) compared to 47.97% for DRC, 49.20% for PIC, and 48.62% for RHC. At offdesign conditions with a power demand (PD) of 40% of the design load (50 MW), the thermal efficiency is decreased by 21.82% in DRC, 17.71% in ICC, 22.46% in PIC, and 13.60% in RHC. The ICC has the minimum levelized cost of electricity compared to the other cycles with 5.93 ¢/kWh at design conditions (dry-cooling), 5.65 ¢/kWh at optimized conditions (wet-cooling), and 7.2 ¢/kWh at minimum PD (21 MW). Therefore, from an economic point of view, the ICC is recommended as the best power block for a sCO 2 power cycle driven by oxy-combustor at moderate TITs. The study also provides constructive comparisons between the DOC-sCO 2 and indirect (nuclear, solar, and waste heat) sCO 2 power cycle systems and the future research directions.

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Section: Results Of Design Optimization and Off‐design And Discussionmentioning

confidence: 99%

Section: Effect Of Compressor Inlet Temperaturementioning

confidence: 99%

Comprehensive thermoeconomic, exergoeconomic, and optimization analyses of direct oxy‐combustion supercritical CO₂ intercooled and reheated cycles under design and off‐design conditions

Al‐Ammari

Sleiti

2022

Energy Science & Engineering

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“…These studies were reviewed by Sleiti et al in Refs. 28, 29. It is found that the high operating temperature ([1150°C]) and pressure (300 bar) of the Allam cycle imposed more expansive and complex designs for its components 30 .…”

Section: Introductionmentioning

confidence: 99%

“…In addition, they have developed a robust discretized model for the recuperators used in the DOC‐based power cycles. After that, Sleiti et al 29 introduced the optimized M1, M2, and M3 cycles at dry and wet cooling situations. Although the preheated configurations show superior performance compared to the basic configuration, the limited access to the waste heat resources at high‐temperatures may limit their feasibility.…”

Section: Introductionmentioning

confidence: 99%

Combined direct oxy‐combustion and concentrated solar supercritical carbon dioxide power system—Thermo, exergoeconomic, and quadruple optimization analyses

Sleiti

Al‐Ammari

2022

Intl J of Energy Research

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Summary For the global future energy systems, concentrated solar power (CSP) and direct CO2 capture systems are of the most important key technologies, however, each of these systems has shortcomings. This study addresses the solar intermittency and power control complexity of the CSP systems and the substantial energy penalty of the direct oxy‐combustion (DOC) supercritical carbon dioxide (sCO2) power systems by integrating both systems. Herein, innovative power cycle configurations that integrate the CSP tower system with DOC sCO2 power cycle are introduced. The configurations include two basic cycles for comparison and validation purposes and three integrated cycles. The basic configurations are: an intercooled sCO2 power cycle driven by DOC system (S1), and a stand‐alone basic CSP tower system (S2). The integrated configurations are: CSP/DOC system where the CSP works as a preheater (S3); CSP/DOC system where the CSP works as a reheater (S4); and CSP/DOC system where each system heats part of the working fluid to drive its high‐pressure turbine (S5). The hybrid configurations reduce the fuel and the parasitic power consumptions of the basic DOC systems (S1) and reduce the capital cost associated with the conventional CSP systems (S2) by eliminating the need for thermal storage. Over practical ranges of operational parameters, comprehensive thermoeconomic, exergoeconomic, and optimization analyses for the proposed configurations are performed. Compared to the conventional CSP system, the LCOE of the hybrid system is lower by 50%. Among the hybrid configurations, the energetic and exergetic performances of S4 are the best with the lowest LCOE. According to the optimization analysis, S4 has a thermal efficiency of 55.29% at LCOEs of 7.705¢/kWh. S3, S5, S2, and S1 have thermal efficiencies of 52.90%, 48.72%, 45.56%, and 40.54% at LCOE of 7.970, 8.138, 7.864, and 6.351¢/kWh, respectively.

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“…▪ Traditional refrigeration systems use HFO/HFC refrigerant blends which have negative impacts on environment such as ozone depletion and global warming [1][2][3][4][12][13]. ▪ Furthermore, refrigeration and air-conditioning systems consume around 17% of the worldwide electricity [5].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Innovative Thermal Mechanical Refrigeration System

Sleiti¹,

Al‐Ammari²,

Al‐Khawaja³

2021

Building Resilience at Universities: Role of Innovation and Entrepreneurship

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The current electrical refrigeration and air condition systems are considered as one of the major sources for ozone depletion and global warming problems. Furthermore, they consume a large percentage of the worldwide gross production of electricity (around 17%). Therefore, developing new refrigeration systems that might be able to work using renewable sources (solar, geothermal, etc.) and waste heat sources is necessary to address these problems. In this paper, the experimental investigation of an innovative thermal-mechanical refrigeration (TMR) system is presented. The TMR system replaces the electric compressor of the conventional refrigeration systems with an innovative expander-compressor unit (two connected double-acting cylinders). The proposed ECU can be driven by ultra-low heat temperature sources, has simple configuration, and high flexibility for the operating conditions. A hybrid electric-compressor and ECU refrigeration setup was developed to investigate the performance of the ECU and compare it to that of an electric compressor. The experiment was conducted using R134a as a working fluid at different masses. The results show that a maximum COP of 0.57 is obtained at a refrigerant mass of 30g (in electric mode) and a maximum COP of 0.41 is obtained at a refrigerant mass of 60g (in ECU mode).

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Thermoeconomic and optimization analyses of direct oxy-combustion supercritical carbon dioxide power cycles with dry and wet cooling

Cited by 31 publications

References 65 publications

Comprehensive thermoeconomic, exergoeconomic, and optimization analyses of direct oxy‐combustion supercritical CO₂ intercooled and reheated cycles under design and off‐design conditions

Comprehensive thermoeconomic, exergoeconomic, and optimization analyses of direct oxy‐combustion supercritical CO₂ intercooled and reheated cycles under design and off‐design conditions

Combined direct oxy‐combustion and concentrated solar supercritical carbon dioxide power system—Thermo, exergoeconomic, and quadruple optimization analyses

Experimental Investigation of Innovative Thermal Mechanical Refrigeration System

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Thermoeconomic and optimization analyses of direct oxy-combustion supercritical carbon dioxide power cycles with dry and wet cooling

Cited by 31 publications

References 65 publications

Comprehensive thermoeconomic, exergoeconomic, and optimization analyses of direct oxy‐combustion supercritical CO2 intercooled and reheated cycles under design and off‐design conditions

Comprehensive thermoeconomic, exergoeconomic, and optimization analyses of direct oxy‐combustion supercritical CO2 intercooled and reheated cycles under design and off‐design conditions

Combined direct oxy‐combustion and concentrated solar supercritical carbon dioxide power system—Thermo, exergoeconomic, and quadruple optimization analyses

Experimental Investigation of Innovative Thermal Mechanical Refrigeration System

Contact Info

Product

Resources

About

Comprehensive thermoeconomic, exergoeconomic, and optimization analyses of direct oxy‐combustion supercritical CO₂ intercooled and reheated cycles under design and off‐design conditions

Comprehensive thermoeconomic, exergoeconomic, and optimization analyses of direct oxy‐combustion supercritical CO₂ intercooled and reheated cycles under design and off‐design conditions