Design and structure optimization of small-scale radial inflow turbine for organic Rankine cycle system

Wu, Tan; Shao, Liwei; Wei, Xinli; Ma, Xiaoxun; Zhang, Guojie

doi:10.1016/j.enconman.2019.111940

Cited by 18 publications

(8 citation statements)

References 32 publications

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“…ORC systems are Rankine cycles that operate under the following ideal processes like Brayton cycles starting with an isentropic compression (1-2), followed by isobaric heat addition (2)(3), for an isentropic expansion in the turbine (3)(4) and finally an isobaric heat extraction (4-1). Implementing the laws of conservation of mass and energy in the main elements of the system yields the following equations for the pump (1, 2), evaporator (3), turbine (4,5), and condenser (6).…”

Section: Thermodynamic Design Analysismentioning

confidence: 99%

“…Radial flow turbines are characterized by their ability to cope with large enthalpy drops at low periphery, low manufacturing cost, and compact structure. 2 Many publications postulate that, for small power or small mass flow rates, volumetric expanders are advantageous in terms of efficiency, rotational speed, size, and cost for power systems with power ratings below 10 kWe. However, in works such as Weiß et al, 3 the differences between turbines and volumetric expanders were analyzed in detail, reaching the conclusion that small turbines may be superior to volumetric expanders since they allow high volumetric flow ratios, a small installation size is needed, there is no wear, lubrication may not be necessary, and they can be customized to a large extent.…”

Section: Introductionmentioning

confidence: 99%

“…Radial flow turbines are characterized by their ability to cope with large enthalpy drops at low periphery, low manufacturing cost, and compact structure. 2…”

Section: Introductionmentioning

confidence: 99%

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Case study: Repowering of ORC system by means of experimental test bench with supercritical carbon dioxide, proposal, and field experience improvements

Domínguez,

Alarcón,

Aviña

et al. 2023

Advances in Mechanical Engineering

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Although organic Rankine cycles (ORCs) have cornered the small-scale energy harvesting market, the generation capacities produced by sCO2 cycles far exceed those of ORCs, reaching higher powers and efficiencies. This paper analyzes the results of the field tests performed in 2022 at the Grupo Dragón, Nayarit, Mexico, facilities, in which the objective was to validate the operation of the ORC IDEA-10 system with a capacity of up to 10 kWe. The thermodynamic states reached during the test time lapses in which there was full operational stability and with direct loads are analyzed. The results obtained together with proposals for improvement led to compare the performance of ORCs with sCO2 systems for low temperature geothermal sources. The efficiencies of simple sCO2 cycles (5.32%) turned out to be lower than that of ORC at the same temperatures (9.7%), however, the efficiency of the sCO2 cycle improved notably in a regenerative configuration, given the properties of CO2 near its critical point, reaching efficiencies above 25% even at low temperatures compared to conventional ORCs with efficiencies below 10%. Finally, the basis for the implementation of sCO2 in low enthalpy geothermal applications was established, designing an experimental circuit with results obtained in the literature.

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Section: Thermodynamic Design Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Case study: Repowering of ORC system by means of experimental test bench with supercritical carbon dioxide, proposal, and field experience improvements

Domínguez,

Alarcón,

Aviña

et al. 2023

Advances in Mechanical Engineering

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“…Equipped with the temperature control system and other auxiliary accessories, the heat source loop takes the electric heating oil furnace as the main equipment. 28 Heat transfer oil, obtained by mixing diphenyl and diphenyl ether with a molar ratio of 26.5% and 73.5%, was used as a simulated heat source. The heating power is adjustable, which provides the stabilized heat source during the experiments.…”

Section: Heat Source Loopmentioning

confidence: 99%

Experimental investigation on the characteristics of heat exchangers based on organic Rankine cycle system under different operating conditions

Meng

Lian

et al. 2021

Int J Energy Res

Self Cite

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Heat exchangers are crucial equipment, and the research related to organic Rankine cycle system is also of paramount importance. Experiments were carried out in a self-built test rig with the radial inflow turbine as the expander under three operating conditions. By analyzing UA values, the heat transfer area in different stages of evaporation or condensation was roughly calculated, so as to understand the operation performance of heat exchangers and its influence on system. Experimental results show that the heat transfer area in gas-phase region accounts for a great proportion of evaporator at the beginning with the rising flow rate of R245fa, and finally insufficient heat transfer area is preferentially provided for the preheating and superheating sections. The turning point occurs when the flow rate of R245fa is 800 kg/h, where the distribution of heat transfer area is relatively balanced with optimum system performance. Excessive heat transfer oil flow rate also results in disequilibrium distribution of heat transfer area in the evaporation process. Meanwhile, the optimal flow rate of heat transfer oil is 4 m 3 /h with maximum thermal efficiencies. Besides, through the comparative analysis of the UA values, the stability of the condenser in the ORC system is better than that of the evaporator under different operating conditions. Highlights 1. The characteristics of the heat exchangers based on ORC system are investigated.2. The distribution of heat transfer area in each stage of evaporation is analyzed.3. The stability of the condenser is better than that of evaporator in experiments.4. The performance of the system is optimal under suitable operating conditions.

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“…The optimization consisted of changing the control points of the shroud curve and the hub curve using the previously mentioned method which is called Self-Adaptive Multi-Objective Differential Evolution. Adjustments to the blade geometry in terms of the effect of the impeller blade leading angle on the aerodynamic properties of the impeller were presented by Wu et al [3].…”

Section: Introductionmentioning

confidence: 99%

Determination of Impeller Blade Fillet Radius for Productive Finish Milling

Vavruska

Kratena²,

Cech³

et al. 2023

Preprint

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Impellers, which are part of the turbochargers in many transport and agricultural vehicles such as cars, trucks, tractors, boats as well as lawnmowers, are parts where monitoring the efficiency of design and subsequent manufacturing is very important. In order to maximize the efficiency of the compressor stage, many iterations in impeller blade geometry design must be performed to achieve the operating conditions in terms of both performance and strength. Impeller manufacturing is then strongly dependent on the impeller blade geometry design. Manufacturing efficiency varies greatly if the impeller is designed with the blades made up of complex surfaces (requires more machining time) or ruled surfaces (requires less machining time). However, the two impeller geometries have a common element that strongly influences their manufacturing efficiency – the impeller blade fillet radius. The choice of the blade fillet radius value is very limited by the impeller blade geometry design. Therefore, this paper proposes a method to determine the blade fillet radius value in order to achieve an efficient impeller geometry in terms of manufacturing efficiency at the impeller design stage. The method is verified on the example of milling several impeller variants.

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Design and structure optimization of small-scale radial inflow turbine for organic Rankine cycle system

Cited by 18 publications

References 32 publications

Case study: Repowering of ORC system by means of experimental test bench with supercritical carbon dioxide, proposal, and field experience improvements

Case study: Repowering of ORC system by means of experimental test bench with supercritical carbon dioxide, proposal, and field experience improvements

Experimental investigation on the characteristics of heat exchangers based on organic Rankine cycle system under different operating conditions

Determination of Impeller Blade Fillet Radius for Productive Finish Milling

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