Parametric study of efficient small-scale axial and radial turbines for solar powered Brayton cycle application

Daabo, Ahmed M.; Jubori, Ayad M. Al; Mahmoud, Saad; Al-Dadah, Raya

doi:10.1016/j.enconman.2016.09.060

Cited by 21 publications

(9 citation statements)

References 20 publications

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“…Once the effective equivalent nozzle area (Equation (8)) of each turbine entry of the turbocharger T#1TE and T#2DV is known, the reduced mass flow parameter in each branch can be calculated using the expression of the flow through an orifice with an isentropic expansion, as shown in Equation (18).…”

Section: Dual-volute Turbinementioning

confidence: 99%

“…They are calculated using Equations (2)- (7). Once the experimental reduced mass flow parameter of each entry is known, the experimental (A j e f f ,i ) of each turbine inlet can be calculated by using Equation (18).…”

Section: Dual-volute Turbinementioning

confidence: 99%

“…Even though partial admission is not often found in automotive applications, it is a quite important operation regime in other energy conversion and management processes. These kinds of radial turbines are used for obtaining electric power from renewable energy sources, such as geothermal energy [16,17], solar energy [18], and compressed air energy storage systems [19]. The Organic Rankine Cycle (ORC) is widely used for these types of energy conversions with an appropriate working fluid because it converts low-grade thermal energy into useful energy [20].…”

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confidence: 99%

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A Robust Adiabatic Model for a Quasi-Steady Prediction of Far-Off Non-Measured Performance in Vaneless Twin-Entry or Dual-Volute Radial Turbines

Serrano¹,

Arnau²,

García-Cuevas³

et al. 2020

Applied Sciences

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The current investigation describes in detail a mass flow oriented model for extrapolation of reduced mass flow and adiabatic efficiency of double entry radial inflow turbines under any unequal and partial flow admission conditions. The model is based on a novel approach, which proposes assimilating double entry turbines to two variable geometry turbines (VGTs) using the mass flow ratio ( MFR ) between the two entries as the discriminating parameter. With such an innovative approach, the model can extrapolate performance parameters to non-measured MFR s, blade-to-jet speed ratios, and reduced speeds. Therefore, the model can be used in a quasi-steady method for predicting double entry turbines performance instantaneously. The model was validated against a dataset from two different double entry turbine types: a twin-entry symmetrical turbine and a dual-volute asymmetrical turbine. Both were tested under steady flow conditions. The proposed model showed accurate results and a coherent set of fitting parameters with physical meaning, as discussed in this paper. The obtained parameters showed very similar figures for the aforementioned turbine types, which allows concluding that they are an adequate set of values for initializing the fitting procedure of any type of double entry radial turbine.

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Section: Dual-volute Turbinementioning

confidence: 99%

Section: Dual-volute Turbinementioning

confidence: 99%

mentioning

confidence: 99%

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A Robust Adiabatic Model for a Quasi-Steady Prediction of Far-Off Non-Measured Performance in Vaneless Twin-Entry or Dual-Volute Radial Turbines

Serrano¹,

Arnau²,

García-Cuevas³

et al. 2020

Applied Sciences

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“…In addition, CFD analysis was applied in studies to optimize radial turbine for solar Brayton cycles. Since turbine efficiency improvement leads to increase in cycle thermal efficiency (for instance, 10% increase in turbine efficiency can improve overall cycle efficiency up to 6%), Daabo et al used CFD tool and one dimensional mean line approach in optimizing radial turbine for solar Brayton cycle. It was found that by applying appropriate design range parameters, the turbine efficiency increased from 82.3% to 89.7%.…”

Section: Brayton Cyclesmentioning

confidence: 99%

“…Summary of the most important reviewed studies Daabo et al70 12 -Enhancement in the efficiency of the cycle (from 6% to 12%) was achievable by improving the efficiency of the turbine from 80% to 90% At optimized operating condition, the overall exergoeconomic factor of the investigated system had 27.34% increment. In addition, the electricity cost generated gas and steam turbines reduced by 1.17% and 7.1%, respectively.…”

mentioning

confidence: 99%

A review on solar‐assisted gas turbines

Ahmadi

Nazari

Ghasempour

et al. 2018

Energy Science & Engineering

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The thermal energy of the sun can be used for electricity generation. Solar thermal energy can be applied with fossil fuels or independently in order to reduce the cost of generated electricity and CO2 emission. Several cycles are introduced to extract solar thermal energy to be used in power plants. Brayton cycles, Rankine‐Brayton cycles, and supercritical Brayton cycles are among the most conventional ones. Based on the reviewed researches, using solar energy in addition to fossil fuels results in lower carbon dioxide emission and lower levelized cost of the generated electricity. Moreover, thermodynamic and economic analyses of the cycles revealed that heat recovery leads to higher efficiency while increase capital cost. The efficiency of solar‐assisted gas turbines depend on various parameters including pressure ratio, turbine inlet temperature, heat absorber geometry and the performance of the components. The enhancement in the efficiency of the cycles by applying each method depends on the configuration, operating condition. For instance, results have shown that 10% increase in turbine efficiency can led to 6%‐12% improvement in the efficiency of a closed‐Brayton cycle.

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Geometric optimization model for the solar cavity receiver with helical pipe at different solar radiation

et al. 2019

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Parametric study of efficient small-scale axial and radial turbines for solar powered Brayton cycle application

Cited by 21 publications

References 20 publications

A Robust Adiabatic Model for a Quasi-Steady Prediction of Far-Off Non-Measured Performance in Vaneless Twin-Entry or Dual-Volute Radial Turbines

A Robust Adiabatic Model for a Quasi-Steady Prediction of Far-Off Non-Measured Performance in Vaneless Twin-Entry or Dual-Volute Radial Turbines

A review on solar‐assisted gas turbines

Geometric optimization model for the solar cavity receiver with helical pipe at different solar radiation

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