Study of working fluid selection of organic Rankine cycle (ORC) for engine waste heat recovery

Wang, E.H.; Zhang, H.G.; Fan, Boyuan; Ouyang, Minggao; Zhao, Yanxing; Mu, Quanquan

doi:10.1016/j.energy.2011.03.041

Cited by 594 publications

(204 citation statements)

References 24 publications

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“…In the present study, enhanced factors of 1.6 and 1.2 were employed when estimating the heat transfer coefficients in the shell side and the tube side, respectively, of the preheater. The refrigerant R245fa was used as the working fluid; this refrigerant is one of the most suitable fluids for low grade waste heat recovery in an ORC system [19]. The mass flow rate (m R ) was set to be 11.58 kg/s.…”

Section: System Descriptionmentioning

confidence: 99%

Performance of a 250 kW Organic Rankine Cycle System for Off-Design Heat Source Conditions

Liu

2014

Proceedings of 1st International E-Conference on Energies

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An organic Rankine cycle system with a preheater, evaporator, condenser, turbine, generator, and pump was used to study its off-design performance and operational control strategy. R245fa was used as a working fluid. The net power output is 243 kW and the system thermal efficiency is 9.5% under the design conditions. For an off-design heat source flow rate (m W ), the operating pressure was controlled to meet the condition that the R245fa reached the saturation liquid and vapor states at the outlet of the preheater and evaporator, respectively. The analytical results demonstrated that the operating pressure increased with increasing m W ; a higher m W yielded better heat transfer performance of the preheater and required a smaller evaporator heat capacity; and the net power output and system thermal efficiency increased with increasing m W . The net power output increased by 64.0% while the total heat transfer rate increased by only 9.2% for the studied range of m W . To conclude, an off-design operation is studied for a heat source flow rate which varied from -39.0% to +78.0% from the designed rate, resulting in -29.2% to +16.0% and -25.3% to +12.6% variations in the net power output and system thermal efficiency, respectively.

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Section: System Descriptionmentioning

confidence: 99%

Performance of a 250 kW Organic Rankine Cycle System for Off-Design Heat Source Conditions

Liu

2014

Proceedings of 1st International E-Conference on Energies

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“…The characteristics of a thermal energy source affects the optimal choice of working fluid (WF) for an ORC (e.g. [10][11][12][13][14][15][16][17][18][19][20]). Different objective functions have been used for WF selection, such as the ratio of net power output to heat exchanger area (Ẇ net /A) [10], net power output (Ẇ net ) [14,19,21,22] and first or second law efficiencies [7, 11-13, 16-18, 20].…”

Section: Introductionmentioning

confidence: 99%

Modeling and optimization of a binary geothermal power plant

Ghasemi

Paci

Tizzanini

et al. 2013

Energy

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6A model is developed for an existing organic Rankine cycle (ORC) utilizing a low temperature geothermal source. The model is implemented in Aspen Plus ® and used to simulate the performance of the existing ORC equipped with an air-cooled condensation system. The model includes all the actual characteristics of the components. The model is validated by approximately 5000 measured data in a wide range of ambient temperatures. The net power output of the system is maximized. The results suggest different optimal operation strategies based on the ambient temperature. Existing literature claims that no superheat is optimal for maximum performance of the system; this is confirmed only for low ambient temperatures. For moderate ambient temperatures (T amb ≥ 1.7 ) superheat maximizes net power output of the system. The value of the optimal superheat increases with increasing ambient temperature.The optimal operation boosts the total power produced in a year by 9%. In addition, a simpler and semi-analytic model is developed that enables very quick optimization of the operation of the cycle. Based on the pinch condition at the condenser, a simple explicit formula is derived that predicts the outlet pressure of the turbine as a function of mass flow rate of working fluid.

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“…In this work, exhaust flue gases were assumed to be cooled down to a temperature 10 degrees higher than their dew point and used as a heat source for a R245fa ORC. R245fa is one of the most commonly employed fluids in ORC systems [52]. Efficiency for ORC pumps and expanders was determined using linear correlations taking into account thermal inputs for the cycle, based on data for currently available machinery on the market [53].…”

Section: Power Generation Using Gas Engine and Organic Rankine Cyclementioning

confidence: 99%

Potential for Energy Production from Farm Wastes Using Anaerobic Digestion in the UK: An Economic Comparison of Different Size Plants

et al. 2017

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Anaerobic digestion (AD) plants enable renewable fuel, heat, and electricity production, with their efficiency and capital cost strongly dependent on their installed capacity. In this work, the technical and economic feasibility of different scale AD combined heat and power (CHP) plants was analyzed. Process configurations involving the use of waste produced in different farms as feedstock for a centralized AD plant were assessed too. The results show that the levelized cost of electricity are lower for large-scale plants due to the use of more efficient conversion devices and their lower capital cost per unit of electricity produced. The levelized cost of electricity was estimated to be 4.3 p/kWh e for AD plants processing the waste of 125 dairy cow sized herds compared to 1.9 p/kWh e for AD plants processing waste of 1000 dairy cow sized herds. The techno-economic feasibility of the installation of CO 2 capture units in centralized AD-CHP plants was also undertaken. The conducted research demonstrated that negative CO 2 emission AD power generation plants could be economically viable with currently paid feed-in tariffs in the UK.

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Study of working fluid selection of organic Rankine cycle (ORC) for engine waste heat recovery

Cited by 594 publications

References 24 publications

Performance of a 250 kW Organic Rankine Cycle System for Off-Design Heat Source Conditions

Performance of a 250 kW Organic Rankine Cycle System for Off-Design Heat Source Conditions

Modeling and optimization of a binary geothermal power plant

Potential for Energy Production from Farm Wastes Using Anaerobic Digestion in the UK: An Economic Comparison of Different Size Plants

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