Thermodynamic investigation of organic Rankine cycle energy recovery system and recent studies

Boydak, Ozlem; Ekmekçi, İsmail; Yılmaz, Mustafa Tahsin; Köten, Hasan

doi:10.2298/tsci170720103b

Cited by 15 publications

(8 citation statements)

References 54 publications

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“…This system is similar to the conventional Rankine Cycle, differed by using organic fluids instead of water. Organic fluids have lower critical pressures and lower evaporation temperatures, allowing lower temperature thermal sources [4,5].…”

Section: Introductionmentioning

confidence: 99%

Selection of the working fluid for a high-temperature ORC hot-source to be applied in the Brazilian semi-arid

et al. 2023

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This paper aims to select the most suitable working fluid to be applied in a high-temperature regenerative hot-source Organic Rankine Cycle, such as those driven by biomass, for climatic conditions measured from real data in Bom Jesus da Lapa in northeastern Brazil. To this end, the most commonly used working fluids in these systems were selected among numerous authors, discarding those with high Global Warming Potential and Ozone Depletion Potential and those classified as wet according to the slope of their Temperature - Entropy diagram. Then, from the model developed in the software EES, the simulation and performance analysis of the proposed system was performed based on thermal efficiency. It was conducted a fluid selection from the adaptation and expanding the parameters of the qualitative spinal point method, considering the thermodynamic performance, environmental preservation criteria, safety, and fluid characteristics. As a result, it was obtained that hydrocarbons present the best thermodynamic and qualitative performances, with benzene and cyclohexane being the most attractive to be used as fluids in the proposed ORC, followed by n-hexane.

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Section: Introductionmentioning

confidence: 99%

Selection of the working fluid for a high-temperature ORC hot-source to be applied in the Brazilian semi-arid

et al. 2023

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“…Organic Rankine cycle power generation system has been extensively studied because it can effectively utilize medium and low temperature heat sources. Hasan Koten et al [1] carried out a detailed study of ORC system and a variety of working fluids, and concluded that its power generation efficiency is between 10-20%. As an important part of ORC system, condenser can provide a lower outlet back pressure for steam turbine to improve the power generation of the system.…”

Section: Introductionmentioning

confidence: 99%

Improvement research of condensing equipment in organic Rankine cycle power generation systems

Zhang

et al. 2021

THERM SCI

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Dry hot rock power generation is an important part of geothermal energy application, and condenser has become an important part of the system because it can provide a lower outlet back pressure for steam turbine, and improve the power generation of the system. Engineering Equation Solver is applied to assess the performance of cooling towers for organic Rankine cycle power generation systems. In the present study, two models with different cooling towers are considered: In the first model, the predicted performance of the opening cooling tower for organic Rankine cycle systems is studied and compared with the experimental measurement for a 500 kW system. In the second model, because of the high mass flow of the cooling water and high energy consumption of the cooling water pump for the opening cooling tower, the predicted performance of the closed wet cooling tower to replace the opening cooling tower for organic Rankine cycle systems is studied. The models are capable of predicting the variation of evaporation and condensation temperatures, the pressure loss of heat exchangers. R123, R227ea, R245fa, R600 and R600a are tested as working fluids. The results show that the second model reduces the energy consumption of the cooling water pump, and it also improves the net power generation and net generation efficiency for using R227ea, R600, R600a. However, with the increase of the closed wet cooling tower pressure loss, both the net power generation and net generation efficiency decrease. Therefore, different working fluids are suitable for different pressure loss.

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“…An example of how to use the waste heat for electricity production is implementation of Organic Rankine Cycle (ORC). This case was numerically studied via thermodynamic modelling of system component in [5]. Analysis has shown that, using a heat source with temperature of 700 C and mass flow rate of 0,23 kg/s, turbine power of ORC system is 5,2 kW, with average turbine efficiency of 50 %.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Energy Use in Industrial Facility

Kadric¹,

Delalić²,

Delalić-Gurda³

et al. 2021

Journal of Thermal Engineering

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Energy saving potentials related to steam generation and its usage in the medium size bakery are analyzed and presented. Input data needed for the investigation are gathered through detailed energy audit. Four energy savings measures are analysed in detail: 1) change of heat generator for space heating and domestic hot water preparation from steam boiler to condensing boiler, 2) reduction of heat losses from steam and condensate distribution lines, 3) heat utilization of return condensate and 4) replacement of the old, low efficiency steam boiler with high-efficient one. Implementation of these measures will result in substantial reduction of energy costs, ranging from 2.900 to 26.200 € annually. Interaction of all measures is analysed through energy efficiency improvement scenario, whose implementation will ensure significant energy cost savings, estimated at 40.793 € annually, with simple payback period shorter than 4 years. Implementation of presented measures will improve facility's energy efficiency, represented through reduction of annual energy performance indicators by 6,14 %. Presented analysis revealed that steam generation and its usage in the industrial facilities offer a substantial potential for reduction of energy use and energy related cost.

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Thermodynamic investigation of organic Rankine cycle energy recovery system and recent studies

Cited by 15 publications

References 54 publications

Selection of the working fluid for a high-temperature ORC hot-source to be applied in the Brazilian semi-arid

Selection of the working fluid for a high-temperature ORC hot-source to be applied in the Brazilian semi-arid

Improvement research of condensing equipment in organic Rankine cycle power generation systems

Reduction of Energy Use in Industrial Facility

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