Thermodynamic analysis of high-temperature regenerative organic Rankine cycles using siloxanes as working fluids

Fernandez, F; Prieto, M.M.; Suárez, I.

doi:10.1016/j.energy.2011.06.028

Cited by 119 publications

(37 citation statements)

References 25 publications

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“…Finally, in the last case (Case 5) the intermediate steam pressure and ORC operating parameters are optimized. The working fluid is MDM in all cases, which is frequently reported in the literature as a good working fluid for the application considered here [54]. Siloxanes, like MDM, have a low toxicity, low flammability and have a high thermal stability [55].…”

Section: Cases Under Investigationmentioning

confidence: 99%

Case Study of an Organic Rankine Cycle (ORC) for Waste Heat Recovery from an Electric Arc Furnace (EAF)

et al. 2017

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The organic Rankine cycle (ORC) is a mature technology for the conversion of waste heat to electricity. Although many energy intensive industries could benefit significantly from the integration of ORC technology, its current adoption rate is limited. One important reason for this arises from the difficulty of prospective investors and end-users to recognize and, ultimately, realise the potential energy savings from such deployment. In recent years, electric arc furnaces (EAF) have been identified as particularly interesting candidates for the implementation of waste heat recovery projects. Therefore, in this work, the integration of an ORC system into a 100 MWe EAF is investigated. The effect of evaluations based on averaged heat profiles, a steam buffer and optimized ORC architectures is investigated. The results show that it is crucial to take into account the heat profile variations for the typical batch process of an EAF. An optimized subcritical ORC system is found capable of generating a net electrical output of 752 kWe with a steam buffer working at 25 bar. If combined heating is considered, the ORC system can be optimized to generate 521 kWe of electricity, while also delivering 4.52 MW of heat. Finally, an increased power output (by 26% with combined heating, and by 39% without combined heating) can be achieved by using high temperature thermal oil for buffering instead of a steam loop; however, the use of thermal oil in these applications has been until now typically discouraged due to flammability concerns.

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Section: Cases Under Investigationmentioning

confidence: 99%

Case Study of an Organic Rankine Cycle (ORC) for Waste Heat Recovery from an Electric Arc Furnace (EAF)

et al. 2017

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“…In general, the fluids having a high critical temperature can reach high thermodynamic efficiencies in cycles in which high turbine inlet temperatures can be adopted [10][11][12]. The relation of the molecular weight and the critical temperature as well as the relation of the critical temperature and the cycle efficiency for different kinds of working fluids are shown in Figure 1.…”

Section: Working Fluid Selectionmentioning

confidence: 99%

Design and testing of high temperature micro-ORC test stand using Siloxane as working fluid

Turunen-Saaresti

Uusitalo

Honkatukia

2017

J. Phys.: Conf. Ser.

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“…Multi-stage ORCs and the usage of a regenerator cause higher complexity and higher effort for measurement and control of the To increase the efficiency of ORC units compared to the basic configuration, approaches with and without additional components have to be distinguished. For the latter, the most commonly known are the integration of an internal recuperator [38][39][40][41], additional preheating of the working fluid by use of an economizer [42,43] and multi-stage processes [44][45][46][47][48][49][50][51][52]. Methods without additional components mainly focus on improving the temperature match between heat source, working fluid and environment.…”

Section: Approach For Modular Design Of Orc Unitsmentioning

confidence: 99%

Thermoeconomic Evaluation of Modular Organic Rankine Cycles for Waste Heat Recovery over a Broad Range of Heat Source Temperatures and Capacities

Preißinger

Brüggemann

2017

Energies

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Industrial waste heat recovery by means of an Organic Rankine Cycle (ORC) can contribute to the reduction of CO 2 emissions from industries. Before market penetration, high efficiency modular concepts have to be developed to achieve appropriate economic value for industrial decision makers. This paper aims to investigate modularly designed ORC systems from a thermoeconomic point of view. The main goal is a recommendation for a suitable chemical class of working fluids, preferable ORC design and a range of heat source temperatures and thermal capacities in which modular ORCs can be economically feasible. For this purpose, a thermoeconomic model has been developed which is based on size and complexity parameters of the ORC components. Special emphasis has been laid on the turbine model. The paper reveals that alkylbenzenes lead to higher exergetic efficiencies compared to alkanes and siloxanes. However, based on the thermoeconomic model, the payback periods of the chemical classes are almost identical. With the ORC design, the developed model and the boundary conditions of this study, hexamethyldisiloxane is a suitable working fluid and leads to a payback period of less than 5 years for a heat source temperature of 400 to 600 • C and a mass flow rate of the gaseous waste heat stream of more than 4 kg/s.

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Thermodynamic analysis of high-temperature regenerative organic Rankine cycles using siloxanes as working fluids

Cited by 119 publications

References 25 publications

Case Study of an Organic Rankine Cycle (ORC) for Waste Heat Recovery from an Electric Arc Furnace (EAF)

Case Study of an Organic Rankine Cycle (ORC) for Waste Heat Recovery from an Electric Arc Furnace (EAF)

Design and testing of high temperature micro-ORC test stand using Siloxane as working fluid

Thermoeconomic Evaluation of Modular Organic Rankine Cycles for Waste Heat Recovery over a Broad Range of Heat Source Temperatures and Capacities

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