An innovative small-scale two-stage axial turbine for low-temperature organic Rankine cycle

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

doi:10.1016/j.enconman.2017.04.039

Cited by 34 publications

(11 citation statements)

References 34 publications

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“…Engineering equation software (EES) (Klein, 2013) was used to model the ORC system. More details about the ORC system modelling can be found in the previous studies as Al Jubori et al (2016) and Al Jubori et al (2017a). Corresponding to the condenser pressure…”

Section: Organic Rankine Cycle Modellingmentioning

confidence: 99%

Design and manufacturing a small-scale radial-inflow turbine for clean organic Rankine power system

Jubori

Al-Mousawi

Rahbar

et al. 2020

Journal of Cleaner Production

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Section: Organic Rankine Cycle Modellingmentioning

confidence: 99%

Design and manufacturing a small-scale radial-inflow turbine for clean organic Rankine power system

Jubori

Al-Mousawi

Rahbar

et al. 2020

Journal of Cleaner Production

Self Cite

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“…(6) in Eq. (15) and considering that the flow Mach number is kept constant for two different fluids, the following equality can be stated:…”

Section: Calculation Of Homologous Points For Different Fluids Througmentioning

confidence: 99%

“…Organic Rankine cycles (ORCs) are considered a promising technology to drive forward micro and small-scale power cycles based on renewable heat sources [14,15]. Besides, novel conceptions of Brayton cycles using air [16] or fluids in supercritical conditions such as carbon dioxide (CO2) [17,18] are also interesting for low power applications due to their high compactness and modularity [19].…”

Section: Introductionmentioning

confidence: 99%

Reynolds-number-dependent efficiency characterization of a micro-scale centrifugal compressor using non-conventional working fluids

Valdés

Sebastián

Abbas

2018

Energy Conversion and Management

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The selection of working fluids other than air is a key issue in improving the efficiency of new thermodynamic cycles intended for low-to-moderate temperature small power plants The aim of this paper is to study whether the low efficiency typical of small turbomachinery is still a problem when using alternative fluids Based on a new design of power cycles named balanced hybrid Rankine-Brayton cycles, five different fluids were selected as potential working fluids: carbon dioxide, propane, isobutane, pentafluoroethane and sulfur hexafluoride Dimensional analysis was used to compare the performances of a micro-scale centrifugal compressor working in homologous points where the efficiency variation depends only on the Reynolds-number (Re) The influence of Re on efficiency was calculated by means of four different methods for comparative purposes Numerical simulations were also carried out in order to validate the methodological approach proposed The results show the efficiency variations as a function of Re for increasing fluid densities All the nonconventional fluids studied provide better performance in terms of efficiency than air Particularly, isobutane and propane have been identified as potential working fluids candidates for the aforementioned innovative power cycle *

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“…Witanowski et al [31] conducted an optimization of an axial turbine for a small scale ORC, and the total-to-static efficiency of the turbine reached to 80.6%. Al Jubori et al [32] proposed a three-dimensional multi-objective optimization model for turbine stage to improve turbine efficiency and ORC system performance, based on a low-temperature small-scale ORC application where the heat source temperature was less than 100 • C. Subsequently, a two-stage axial-flow turbine model was established [33], and the mean-line preliminary design method, three-dimensional CFD analysis, and ORC system thermodynamics model were integrated. The analysis showed that the two-stage axial-flow turbine had a higher efficiency than the single-stage turbine, indicating the potential application of two-stage axial flow turbine in low-temperature small-scale ORC.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Design of an Axial-Flow Turbine for Small-Scale Supercritical Organic Rankine Cycle

2021

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A small-scale organic Rankine cycle (ORC) with kW-class power output has a wide application prospect in industrial low-grade energy utilization. Increasing the expansion pressure ratio of small-scale ORC is an effective approach to improve the energy efficiency. However, there is a lack of suitable expander for small-scale ORC that can operate with a high efficiency under the condition of large expansion pressure ratio and small mass flow rate. Aiming at the design of high-efficiency axial-flow turbine in small ORC system, this paper investigates the performance of a kW-class axial-flow turbine and proposes a method for efficiency improvement. First, the preliminary design of an axial-flow turbine is conducted to optimize the geometric parameters and aerodynamic parameters. Then, the effects of tip clearance and trailing edge thickness on turbine performance are analyzed under design and off-design conditions. The results show that the efficiency of the two-stage or three-stage turbine is evidently better than that of the single-stage one. The output power and efficiency of the three-stage turbine are close to that of the two-stage turbine while the speed is lower. Meanwhile, the trailing edge loss and leakage loss can be significantly reduced via reducing the trailing edge thickness and tip clearance, and thus the turbine efficiency can be improved significantly. The estimated efficiency arrives at 0.82, which is 33% higher than that of the conventional turbine. Considering the limitation of turbine speed, three-stage axial-flow turbine is a feasible choice to improve turbine efficiency in a small-scale ORC.

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An innovative small-scale two-stage axial turbine for low-temperature organic Rankine cycle

Cited by 34 publications

References 34 publications

Design and manufacturing a small-scale radial-inflow turbine for clean organic Rankine power system

Design and manufacturing a small-scale radial-inflow turbine for clean organic Rankine power system

Reynolds-number-dependent efficiency characterization of a micro-scale centrifugal compressor using non-conventional working fluids

Preliminary Design of an Axial-Flow Turbine for Small-Scale Supercritical Organic Rankine Cycle

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