Thermodynamic performance analysis of a R245fa organic Rankine cycle (ORC) with different kinds of heat sources at evaporator

Kong, Rithy; Deethayat, Thoranis; Asanakham, Attakorn; Vorayos, Nat; Kiatsiriroat, Tanongkiat

doi:10.1016/j.csite.2018.100385

Cited by 56 publications

(14 citation statements)

References 10 publications

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“…Thermodynamic analysis can be performed based on the first and the second law of thermodynamics. The cycle thermal efficiency η th which is based on the first law of thermodynamics, is expressed by formula (11): (11) where W net indicates the net output power of the ORC system, kW.…”

Section: Thermodynamic Analysismentioning

confidence: 99%

“…They found that there was a strong correlation between the critical temperature of the working fluid and the system efficiency, and thermal efficiency could be improved by 25% with R600. The first law and the second law were applied to analyze the 20 kWe ORC system using R245fa with different lowgrade heat sources, including hot water, saturated steam, and combined hot water and saturated steam [11]. The results indicated that the first law efficiency increased with the heat source temperature, and the first and the second law efficiencies decreased with the increase of pinch value.…”

Section: Introductionmentioning

confidence: 99%

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Optimization Study on Regenerative Organic Rankine Cycle (ORC) with Heat Source of Low-Grade Steam

Wang¹,

Yan²,

Zhu³

et al. 2022

Energy Engineering

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Aiming at improving the performance of Organic Rankine Cycle (ORC) system with low-grade steam as heat source, this work studied and optimized the main operating parameters of the ORC system. The effects of evaporation temperature, superheat degree, condensation temperature and regenerator pinch temperature difference on the system performance were obtained. The optimization for the operating parameters is based on the indicators of specific net power output, waste heat pollution, cycle exergy efficiency, and total UA value (the product of overall heat transfer coefficient and heat transfer area of heat exchanger). The results show that the increase of the evaporation temperature and the superheat degree, and the decrease of the condensation temperature and regenerator pinch temperature difference can improve general system performance but lead to weaker economic performance. The optimal evaporation temperature, superheat degree, condensation temperature and regenerator pinch temperature difference are determined as 139°C, 4°C, 36°C and 8°C, respectively, reaching net power output of 114.73 kW, exergy efficiency of 37.10%. Besides, it is indicated that the regenerative ORC system can reach 13.6% additional net power output compared to the ORC system without the regenerator.

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Section: Thermodynamic Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization Study on Regenerative Organic Rankine Cycle (ORC) with Heat Source of Low-Grade Steam

Wang¹,

Yan²,

Zhu³

et al. 2022

Energy Engineering

View full text Add to dashboard Cite

show abstract

“…Maisotsenko gas turbine cycle also known as M-cycle is a recently proposed bottoming cycle. Kong et al [15] concluded that the increase in pinch value leads to lowering the second law efficiency for which it used three different heat sources such as hot water, saturated steam, and combined hot water/saturated steam to supply heat at the ORC evaporator and with the heat source temperature varying from 80-110°C, the difference in pinch temperature of the heat source and the evaporating temperature was in the range of 1-10°C. Sachdeva and Singh [22] performed the theoretical analysis based on both the Ist & IInd law of thermodynamics to assess the performance parameters for identifying optimal conditions of the combined cycle configuration.…”

Section: Introductionmentioning

confidence: 99%

Energy-Exergy Analysis of Solarized Triple Combined Cycle Having Intercooling, Reheating and Waste Heat Utilization

Singh¹,

Arora²,

Sharma³

2021

TI-IJES

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Heliostat-based solar thermal power system consisting of a combination of the Brayton cycle, Rankine cycle, and organic Rankine cycle is a potential option for harnessing solar energy for power generation. Among different options for improving the performance of solarized triple combined cycle the option of introducing intercooling and reheating in the gas turbine cycle and utilizing the waste heat for augmenting the power output needs investigation. Present study considers a solarized triple combined cycle with intercooling and reheating in gas turbines while using the heat rejected in intercooling in heat recovery vapour generator and heat recovery steam generator separately in two different arrangements. A comparison of two distinct cycle arrangements has been carried out based on Ist law and IInd law of thermodynamics with the help of thermodynamic parameters. Results show that triple combined cycle having intercooling heat used in heat recovery vapour generator offers maximum energy efficiency of 63.54% at 8 CPR & 300K ambient temperature and maximum exergetic efficiency of 38.37% at 14 CPR & 300 K. While the use of intercooling heat in heat recovery steam generator offers maximum energy and exergetic efficiency of 64.15% and 39.72% respectively at 16 CPR & 300 K ambient temperature.

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“…The variability, on a seasonal and hourly basis, of the thermal demand for domestic hot water (DHW) production and heating purposes, calls for the integration to the plant of a vessel for thermal energy storage (TES), to serve the dual purpose of (i) decoupling the thermal availability at the evaporator from any environment-induced disturbance [13][14][15][16] and (ii) harvesting thermal energy during no DHW-withdrawals to feed it to the power section for electricity generation. Plus, the proper filling-emptying dynamics of the storage unit is the key to both (i) optimum ORC unit sizing and (ii) prevention of ORC off-design operation, resulting in stabler operation, higher energy performance for plant components and larger net power generation [17,18].…”

Section: Introductionmentioning

confidence: 99%

Experimental Assessment of a Multi-Variable Control Strategy of a Micro-Cogeneration Solar-ORC Plant for Domestic Application

et al. 2021

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Suitability to off-design operation, applicability to combined thermal and electrical generation in a wide range of low temperatures and pressures and compliance with safety and environmental limitations qualify small-scale Organic Rankine Cycle plants as a viable option for combined heat and power generation in the residential sector. As the plants scale down, the electric and thermal output maximization has to account for issues, spanning from high pump power absorption, compared to the electric output of the plant, to intrinsically low plant permeability induced by the expander, to the intermittent availability of thermal power, affected by the heat demand for domestic hot water (DHW) production. The present paper accounts for a flat-plate solar thermal collector array, bottomed by an ORC unit featuring a sliding vane expander and pump and flat-plate heat exchangers. A high-temperature buffer vessel stores artificially heated water – electric heaters, simulating the solar collector - and feeds either the hot water line for domestic use or the ORC evaporator, depending on the instantaneous demand (i.e., domestic hot water or electric power), the temperature conditions inside the tank and the stored mass availability. A low-temperature receiver acts like the heat sink of the ORC unit and harvests the residual thermal power, downstream the expander: a dedicated control, modelled to properly modulate the mass addition/subtraction to this storage unit allows to restore the operating points of the cycle and to limit the incidence of off-design operation, via real-time adjustment of the cycle operating parameters. Indeed, the possibility of continuous ORC generation depends on (i) the nature of the demand and (ii) the amount of hot water withdrawn from the high-temperature buffer vessel. The time-to-temperature for the mass stored inside the buffer affects the amount of ORC unit activations and eventually the maximum attainable generation of electric energy. The plant energy performance is experimentally assessed, and various characteristic operating points are mapped, based on test runs carried out on a real-scale ORC pilot unit.

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Thermodynamic performance analysis of a R245fa organic Rankine cycle (ORC) with different kinds of heat sources at evaporator

Cited by 56 publications

References 10 publications

Optimization Study on Regenerative Organic Rankine Cycle (ORC) with Heat Source of Low-Grade Steam

Optimization Study on Regenerative Organic Rankine Cycle (ORC) with Heat Source of Low-Grade Steam

Energy-Exergy Analysis of Solarized Triple Combined Cycle Having Intercooling, Reheating and Waste Heat Utilization

Experimental Assessment of a Multi-Variable Control Strategy of a Micro-Cogeneration Solar-ORC Plant for Domestic Application

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