Cycle and turbine optimisation for an ORC operating with two-phase expansion

White, Martin T.

doi:10.1016/j.applthermaleng.2021.116852

Cited by 32 publications

(12 citation statements)

References 30 publications

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“…65 The stator blade was subjected to stationary conditions with respect to the absolute reference frame. At the design point, the rotor blade's translational velocity is 425 m s 21 . Please refer to Table 3 for a comprehensive list of the stage parameters.…”

Section: Validationmentioning

confidence: 99%

“…Von Backstro¨m and Gannon 20 investigated analytical equations to present the effect of each factor on turbine efficiency in terms of reaction ratio and flow. White 21 presented thermodynamic system optimization for fluids in which the reaction ratio applied to distinction among the stator and rotor expansion process. The effect of the degree of reaction was studied as design criterion for ventilation power at a lowpressure steam turbine by Mambro et al 22 Different outlet pressures have a significant effect on nucleation rate and liquid mass fraction in the steam turbine.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing low-pressure stage steam turbine using the TDLD criterion and the TOPSIS analysis

Dolatabadi,

Lakzian,

Masoumi

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The liquid phase in the wet steam flow causes thermodynamics losses and affects steam turbine blade durability. The main objective of the present research is the design of the rotor stagger angle and different operating conditions in the low-pressure stage of the steam turbine. A two-phase Eulerian-Eulerian model and the SST k − ω model are used to simulate the viscous wet steam flow inside the steam turbine stage. Frozen rotor methodology is employed for modeling the stator-rotor interaction. The effects of different rotor stagger angles and different outlet pressure levels on the wet steam flow parameters are studied to introduce an improved case. The turbine stage efficiency, droplet average radius, liquid mass fraction, and degree of reaction (TDLD) are considered as design criteria. The search for the improved value of pressure ratio and rotor stagger angle is performed using the TDLD criterion by TOPSIS (Technique for Order of Preference by Similarity to Ideal Solution). The improved case is selected with a rotor stagger angle of 64 degrees and outlet pressure of 6.5 kPa, at which the turbine stage efficiency (TSE) is increased by 21.3% compared to [Formula: see text]. Also, the liquid mass fraction (LMF) and the degree of reaction (DOR) reduced by 39.53 and 26% relative to [Formula: see text], and [Formula: see text], respectively. In addition, droplet average radius (DAR) increases by 26.14% compared to [Formula: see text].

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Section: Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancing low-pressure stage steam turbine using the TDLD criterion and the TOPSIS analysis

Dolatabadi,

Lakzian,

Masoumi

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Then, the fluid is heated by two heat exchangers in series using water as heat source. This vapor, at high Moreover, with the utilization of 'dry fluids' combined with a radial-inflow turbine, White [13] showed, through a theoretical model, that it is possible to insert the liquid-vapor mixture directly in the turbine rotor without harming the turbo-machine blades: the stator would act as a nozzle. The article's conclusions indicate that a full transition from saturated two-phase conditions to superheated vapor can be achieved within the stator by using a dry fluid, such as Novec649 TM .…”

Section: Orc Loopmentioning

confidence: 99%

A Recent Advance on Partial Evaporating Organic Rankine Cycle: Experimental Results on an Axial Turbine

et al. 2022

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The organic Rankine cycle (ORC) technology is an efficient way to convert low-grade heat from renewable sources or waste heat for power generation. The partial evaporating organic Rankine cycle (PEORC) can be considered as a promising alternative as it can offer a higher utilization of the heat source. An experimental investigation of a small ORC system used in full or partial evaporation mode is performed. First characterized in superheated mode, which corresponds to standard ORC behavior, a semi-empirical correlative approach involving traditional non-dimensional turbomachinery parameters (specific speed, pressure ratio) can accurately describe one-phase turbine performance. In a second step, two-phase behavior is experimentally investigated. The efficiency loss caused by the two-phase inlet condition is quantified and considered acceptable. The turbine two-phase operation allows for an increase in the amount of recovered heat source. The ability to operate in two phases provides a new degree of flexibility when designing a PEORC. The semi-empirical correlative approach is then completed to take into account the partially evaporated turbine inlet condition. The qualitative description and the quantitative correlations in the one-phase and two-phase modes were applied to different pure working fluids (Novec649TM, HFE7000 and HFE7100) as well as to a zeotropic mixture (Novec649TM/HFE7000).

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“…The TFC is realized by increasing the mass flow rate of the WF, leading to the absorption of higher amounts of heat from the WF, and, as a result, maximization of the generated power. The risk of erosion by liquid droplets renders turbines unsuitable for two-phase expansion [8]. On the other hand, twin-screw expanders are indicated in the literature as the ideal expansion machine for the TFC [9] because of their ability to handle two-phase flows and operate at high rotational speeds with minimum friction losses.…”

Section: Introductionmentioning

confidence: 99%

Comparison Of The ORC And The PEORC For Low-Temperature Industrial Waste Heat Exploitation

Skiadopoulos,

Manolakos

2024

Proceedings of the 9th World Congress on Momentum, Heat and Mass Transfer

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In this paper, the Organic Rankine Cycle (ORC) and the Partially Evaporated Organic Rankine Cycle (PEORC) were compared for low-temperature waste heat recovery, with a particular focus on industrial applications. Numerical models of the two power cycles were developed, while a dedicated two-phase expansion model simulating the performance of an industrial expander in the twophase region was applied to estimate accurately the efficiency of the PEORC. Different WFs, temperatures of the heat source, and waste heat transfer rates were considered for a complete mapping of the power cycles' efficiency. The simulations indicate that the PEORC efficiency is highly dependent on the performance of the two-phase expander, with vapor quality at the evaporator outlet identified as the most crucial operating parameter. The comparison between the two power cycle architectures reveals that the PEORC performs consistently better, achieving thermal efficiencies between 2.28% and 7.75%, whereas, for identical operating conditions, the respective values for the ORC are in the range of 1.25% to 7.13%.

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Cycle and turbine optimisation for an ORC operating with two-phase expansion

Cited by 32 publications

References 30 publications

Enhancing low-pressure stage steam turbine using the TDLD criterion and the TOPSIS analysis

Enhancing low-pressure stage steam turbine using the TDLD criterion and the TOPSIS analysis

A Recent Advance on Partial Evaporating Organic Rankine Cycle: Experimental Results on an Axial Turbine

Comparison Of The ORC And The PEORC For Low-Temperature Industrial Waste Heat Exploitation

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