Exergetic and heat load optimization of high temperature organic Rankine cycle

Aziz, Faraz; Mudasar, Roshaan; Kim, Man-Hoe

doi:10.1016/j.enconman.2018.05.094

Cited by 24 publications

(9 citation statements)

References 34 publications

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“…To analyze the performances of thermal power systems, researchers have used different performance parameters, including thermal efficiency (η th ) and exergy efficiency (η ex ). Moreover, to indicate the cost and size of the thermodynamic system, parameters such as the total heat transfer area coefficient (UA Total ) and size parameter (SP Total ) have also been used to indicate the heat exchanger and turbomachinery sizes, respectively [13][14][15]. Patel et al [16] studied the optimization of a waste-heat-based organic Rankine cycle (ORC)-powered cascaded vapor compression-absorption refrigeration system.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of the Supercritical Carbon Dioxide Re-compression Brayton Cycle

2020

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This paper presents performance analysis results on supercritical carbon dioxide ( s C O 2 ) re-compression Brayton cycle. Monthly exergy destruction analysis was conducted to find the effects of different ambient and water temperatures on the performance of the system. The results reveal that the gas cooler is the major source of exergy destruction in the system. The total exergy destruction has the lowest value of 390.1 kW when the compressor inlet temperature is near the critical point (at 35 °C) and the compressor outlet pressure is comparatively low ( 24 MPa ). The optimum mass fraction (x) and efficiency of the cycle increase with turbine inlet temperature. The highest efficiency of 49% is obtained at the mass fraction of x = 0.74 and turbine inlet temperature of 700 °C. For predicting the cost of the system, the total heat transfer area coefficient ( U A T o t a l ) and size parameter (SP) are used. The U A T o t a l value has the maximum for the split mass fraction of 0.74 corresponding to the maximum value of thermal efficiency. The SP value for the turbine is 0.212 dm at the turbine inlet temperature of 700 °C and it increases with increasing turbine inlet temperature. However the SP values of the main compressor and re-compressor increase with increasing compressor inlet temperature.

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Section: Introductionmentioning

confidence: 99%

Performance Analysis of the Supercritical Carbon Dioxide Re-compression Brayton Cycle

2020

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“…For the medium temperature ORC, m-xylene was selected as the working fluid. Mxylene was deemed an appropriate candidate for the medium temperature ORC based on the thermal and economic performance indices of Aziz et al [33]. The heat source temperature in the range 230-650 °C, is classified as the medium temperature energy source by a report available online by the United States Department of Energy Office of Scientific and Technical Information [34].…”

Section: System Descriptionmentioning

confidence: 99%

“…The medium temperature ORC is responsible for providing 250 kW of electricity. The inlet temperature of the hot gases from the biomass at state 1 is considered to be at 450 °C [33]. For the stable heat transfer, Therminol VP-1, as the heat transfer fluid, is considered.…”

Section: System Descriptionmentioning

confidence: 99%

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Assessment of a District Trigeneration Biomass Powered Double Organic Rankine Cycle as Primed Mover and Supported Cooling

et al. 2021

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This study presents a combined cooling, heating, and power system powered by biogas, suitable for small scale communities in remote locations. To run such a system, in order to obtain the daily life essentials of electricity, hot water, and cooling, municipal waste can be considered as an option. Furthermore, the organic Rankine cycle part of the organic Rankine cycle powered vapor compression chiller can be used in times of need for additional electric production. The system comprises a medium temperature organic Rankine cycle utilizing M-xylene as its working fluid, and the cooling was covered by an Isobutane vapor compression cycle powered by an R245fa employing organic Rankine cycle. The system analyzed was designated to provide 250 kW of electricity. The energetic and exergetic analysis was performed, considering several system design parameters. The impact of the design parameters in the prime mover has a much greater effect on the whole system. The system proposed can deliver cooling values at the rate between 9.19 and 22 kW and heating values ranging from 879 up to 1255 kW, depending on the design parameter. Furthermore, the second law efficiency of the system was found to be approximately 56% at the baseline conditions and can be increased to 64.5%.

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“…Isentropic efficiency of the compressor is taken as 70% for the application of lowtemperature organic Rankine cycle coupled with heat pump [15]. The thermal efficiencies of all heat exchangers are assumed to be 96% [16]. Superheating of 2°C is selected for the analysis since, in real industrial processes, the superheating of zero is difficult to ensure [17].…”

Section: B Intergration Of Btes With Gshp-orc Combined Heatmentioning

confidence: 99%

Combining Ground Source Heat Pump and Organic Rankine Cyle for Power and Heat

Mudasar¹,

Leong²,

Fung³

2020

Progress in Canadian Mechanical Engineering. Volume 3

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This study is conducted to analyze the working of borehole thermal energy storage (BTES) with ground source heat pump (GSHP) and organic Rankine cycle (ORC). Drake Landing Solar Community (DLSC) situated in Okotoks, Alberta, Canada with 144 boreholes generating 236 kW of the heating load is taken as a case study to investigate its functionality when coupling with GSHP and ORC. Nine different refrigerants falling in the desired temperature range when BTES temperature drops to 60°C or 50°C during the winter season. This work is an effort to make the existing heating system into a combined heat and power (CHP) system, which is able to generate power to run the BTES and district loop pumps and also provides the heating at the same time. Results revealed that, at a source temperature of 50°C from the BTES, the combination of refrigerant R1234YF-R1234YF was considered to be the best at 75°C evaporation temperature; it raised the fluid temperature at the condenser to 83°C by having maximum coefficient of performance of 3.5 of GSHP and overall combined heat and power efficiency of 77%.

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Exergetic and heat load optimization of high temperature organic Rankine cycle

Cited by 24 publications

References 34 publications

Performance Analysis of the Supercritical Carbon Dioxide Re-compression Brayton Cycle

Performance Analysis of the Supercritical Carbon Dioxide Re-compression Brayton Cycle

Assessment of a District Trigeneration Biomass Powered Double Organic Rankine Cycle as Primed Mover and Supported Cooling

Combining Ground Source Heat Pump and Organic Rankine Cyle for Power and Heat

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