A study of organic working fluids on system efficiency of an ORC using low-grade energy sources

Hung, Tzu-Chen; Wang, S.K.; Kuo, Chien-Hung; Pei, Bau-Shei; Tsai, Kun-Ju

doi:10.1016/j.energy.2009.11.025

Cited by 391 publications

(104 citation statements)

References 15 publications

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“…Also, many investigations on ORC are mainly focused on the choices of the working fluid [7][8][9][10][11][12] and its performance [13][14][15][16][17][18][19][20][21]. Hung et al [13] discussed the irreversible loss of the key parts in ORC and found that the maximum irreversible loss happens in the evaporator.…”

Section: Introductionmentioning

confidence: 99%

The Exergy Loss Distribution and the Heat Transfer Capability in Subcritical Organic Rankine Cycle

Jiao

Tian

et al. 2017

Entropy

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Taking net power output as the optimization objective, the exergy loss distribution of the subcritical Organic Rankine Cycle (ORC) system by using R245fa as the working fluid was calculated under the optimal conditions. The influences of heat source temperature, the evaporator pinch point temperature difference, the expander isentropic efficiency and the cooling water temperature rise on the exergy loss distribution of subcritical ORC system are comprehensively discussed. It is found that there exists a critical value of expander isentropic efficiency and cooling water temperature rise, respectively, under certain conditions. The magnitude of critical value will affect the relative distribution of exergy loss in the expander, the evaporator and the condenser. The research results will help to better understand the characteristics of the exergy loss distribution in an ORC system.

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Section: Introductionmentioning

confidence: 99%

The Exergy Loss Distribution and the Heat Transfer Capability in Subcritical Organic Rankine Cycle

Jiao

Tian

et al. 2017

Entropy

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“…Considerable research has been conducted to determine appropriate organic working fluids for a given heat resource. Hung et al, indicated that wet working fluids with extremely steep saturated vapor curves in the T-s diagram generally perform better than dry working fluids [8]. Wang et al, selected nine pure organic working fluids according to their physical and chemical properties; among these, R245fa and R245ca are found to be the most environment friendly for engine WHR applications [9].…”

Section: Introductionmentioning

confidence: 99%

Analyzing the Performance of a Dual Loop Organic Rankine Cycle System for Waste Heat Recovery of a Heavy-Duty Compressed Natural Gas Engine

et al. 2014

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A dual loop organic Rankine cycle (DORC) system is designed to recover waste heat from a heavy-duty compressed natural gas engine (CNGE), and the performance of the DORC-CNGE combined system is simulated and discussed. The DORC system includes high-temperature (HT) and low-temperature (LT) cycles. The HT cycle recovers energy from the exhaust gas emitted by the engine, whereas the LT cycle recovers energy from intake air, engine coolant, and the HT cycle working fluid in the preheater. The mathematical model of the system is established based on the first and second laws of thermodynamics. The characteristics of waste heat energy from the CNGE are calculated according to engine test data under various operating conditions. Moreover, the performance of the DORC-CNGE combined system is simulated and analyzed using R245fa as the working fluid. Results show that the maximum net power output and the maximum thermal efficiency of the DORC system are 29.37 kW and 10.81%, respectively, under the rated power output condition of the engine. Compared with the original CNG engine, the maximum power output increase ratio and the maximum brake specific fuel consumption improvement ratio are 33.73% and 25%, respectively, in the DORC-CNGE combined system. OPEN ACCESSEnergies 2014, 7 7795

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“…HUNG, T.C. et al, have analyzed and compared the efficiencies of ORCs by using cryogens such as benzene, ammonia, R11, R12, R134A and R113 as working fluids [8][9][10]. LIU, B.T.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and Environmental Analysis of Low-Grade Waste Heat Recovery System for a Ship Power Plant

Deniz¹

2015

IJES

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Shipping is a growing sector in the global economy and its contributions to global greenhouse gas (GHG) emissions are expected to increase. Energy efficiency has always been an important factor to minimize GHG emissions. Waste heat recovery (WHR) systems can be used for both improving energy efficiency and reducing energy consumption and GHG emissions. Organic Rankine Cycles (ORC) systems are the most widely used technology for low temperature heat recovery from exhaust gases in the industrial applications. But this system is not widely used in ship applications. In this study thermodynamic performance criteria of ORC system for a container ship are developed and thermodynamic, environmental and economic effects of the system are analyzed. It can be achieved additionally 2% reduction for the ship fuel consumption by utilizing the ORC system.

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A study of organic working fluids on system efficiency of an ORC using low-grade energy sources

Cited by 391 publications

References 15 publications

The Exergy Loss Distribution and the Heat Transfer Capability in Subcritical Organic Rankine Cycle

The Exergy Loss Distribution and the Heat Transfer Capability in Subcritical Organic Rankine Cycle

Analyzing the Performance of a Dual Loop Organic Rankine Cycle System for Waste Heat Recovery of a Heavy-Duty Compressed Natural Gas Engine

Thermodynamic and Environmental Analysis of Low-Grade Waste Heat Recovery System for a Ship Power Plant

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