Experimental study of an organic Rankine cycle with a variable-rotational-speed scroll expander at various heat source temperatures

Hsieh, Jui‐Ching; Chen, Yen-Hsun; Hsieh, Yu‐Ming

doi:10.1016/j.energy.2023.126956

Cited by 11 publications

(7 citation statements)

References 53 publications

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“…It is worth mentioning that R134a has been used in research related to the organic Rankine cycle (ORC). For instance, in earlier studies conducted by Hsieh et al [29] and Hijriawan et al [30], R134a was used in the organic Rankine cycle. Consequently, R134a was chosen as a reference for comparison with ammonia.…”

Section: Selection Of the Working Fluidmentioning

confidence: 99%

Choosing the Most Suitable Working Fluid for a CTEC

Achkienasi,

Silva,

Mendoza

et al. 2024

Energies

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This study aims to explore additional fluids beneficial for coastal thermal energy converter (CTEC) operation. Ammonia’s thermodynamic properties, characterized by higher condensation temperatures and pressures, demand significantly elevated operating pressures, resulting in a substantial energy load for efficient operation. Thus, exploring alternatives such as R134a becomes crucial, particularly considering its potential as a better working fluid for power generation in a Rankine cycle. The research methodology involves employing computational fluid dynamics (CFD) simulations alongside experimental investigations to examine the performance of an axial turbine concept under different working fluids. The results obtained indicate that R134a is the most appropriate working fluid for an axial turbine within a CTEC, outperforming ammonia, thereby implying significantly better operational efficiency.

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Section: Selection Of the Working Fluidmentioning

confidence: 99%

Choosing the Most Suitable Working Fluid for a CTEC

Achkienasi,

Silva,

Mendoza

et al. 2024

Energies

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“…A pump pressurizes the WF before it enters the evaporator during operation, where it absorbs heat and transforms into a vapor state. The heat capacity in the evaporator is evaluated as follows [10]:…”

Section: Data Reductionmentioning

confidence: 99%

“…As the gaseous WF enters the expander, it expands, generating energy (𝑊 exp ) that drives the rotation of the generator, leading to the production of electrical power (𝑊 elec ). It's important to consider the efficiency of the generator in this process [10].…”

Section: Data Reductionmentioning

confidence: 99%

Experimental study on effect of superheat degree in an organic Rankine cycle with a scroll expander

Hsieh,

Chen,

Hsieh

2024

E3S Web of Conf.

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A micro-organic Rankine cycle (ORC) system utilizing R134a as the working fluid and a scroll expander has been developed. In this study, the effects of superheat degree on system performance were investigated by varying the evaporation temperature and refrigerant mass flow rate. The heat sources used in the ORC system were three different temperatures: 85℃, 95℃, and 105℃. The results indicate that the refrigerant mass flow rate increases with the rise in evaporation pressure, while superheat degree decreases. Moreover, higher superheat degrees led to a reduction in the system power generation. The trend of net efficiency demonstrates that when superheat degree increases, the net efficiency first rises to a peak before declining. At heat source temperatures of 85℃, 95℃, and 105℃, the peak net efficiencies are 4.86%, 5.56%, and 5.87%, respectively, with corresponding superheat degrees of 25.72K, 36.16K, and 38.15K.

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“…Positive displacement expanders have thus gained popularity recently for small-scale power generation and waste heat recovery applications based on ORC. Experimental investigations of ORC-based power plants using positive displacement expanders of various types such as scroll [15][16][17][18][19], rotary vane [20,21], swash-plate [22], and screw [23][24][25] have been realized of late. As the primary component of the thermal-to-power conversion process of the ORC, the expander plays a vital role in the overall performance of the ORC [26,27].…”

Section: Introductionmentioning

confidence: 99%

An Optimum Design for a Fast-Response Solenoid Valve: Application to a Limaçon Gas Expander

Hossain,

Sultan,

Phung

et al. 2024

Dynamics

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Organic Rankine Cycle (ORC)–based small-scale power plants are becoming a promising instrument in the recent drive to utilize renewable sources and reduce carbon emissions. But the effectiveness of such systems is limited by the low efficiency of gas expanders, which are the main part of an ORC system. Limaçon-based expansion machines with a fast inlet control valve have great prospects as they could potentially offer efficiencies over 50%. However, the lack of a highly reliable and significantly fast control valve is hindering its possible application. In this paper, a push–pull solenoid valve is optimized using a stochastic optimization technique to provide a fast response. The optimization yields about 56–58% improvement in overall valve response. A performance comparison of the initial and optimized valves applied to a limaçon expander thermodynamic model is also presented. Additionally, the sensitivity of the valve towards a changing inlet pressure and expander rotor velocity is analyzed to better understand the effectiveness of the valve and provide clues to overall performance improvement.

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Experimental study of an organic Rankine cycle with a variable-rotational-speed scroll expander at various heat source temperatures

Cited by 11 publications

References 53 publications

Choosing the Most Suitable Working Fluid for a CTEC

Choosing the Most Suitable Working Fluid for a CTEC

Experimental study on effect of superheat degree in an organic Rankine cycle with a scroll expander

An Optimum Design for a Fast-Response Solenoid Valve: Application to a Limaçon Gas Expander

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