Organic Rankine Cycle
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2nd European Conference on Polygeneration – 30th March-1st April, 2011– Tarragona, Spain B. Vanslambrouck, I. Vankeirsbilck, S. Gusev, M. De Paepe Turn waste heat into electricity by using an Organic Rankine Cycle
Turn waste heat into electricity by using an Organic Rankine Cycle BrunoVanslambrouck1, Ignace Vankeirsbilck1, Sergei Gusev1, Michel De Paepe2
1Howest, University College of West-Flanders Electromechanics Department, Research Group of Thermodynamics Graaf Karel de Goedelaan 5, 8500, Kortrijk, Belgium
2 Ghent University-UGent
Department of Flow, Heat and Combustion Mechanics Sint-Pietersnieuwstraat 41, 9000 Gent, Belgium
On renewable energy installations such as biogas-, landfill gas- and bio oil engines and even at all kinds of industrial plants lots of waste heat is dissipated into the atmosphere.
On the other hand, there is a proven, commercially available technology to convert it (partially) into electricity. This is the Organic Rankine Cycle (ORC), used since several decades within f.i. geothermal plants. Applications of the same technology for waste heat recovery are rather premature.
To transfer this technology to such applications, practical research in collaboration with industry was performed with as output : technology review (used working fluids to replace water/steam, expander types...), a market overview, view on technical and economical feasibility, simulation models, comparison between the steam cycle and ORC and selection criteria, industrial case studies (landfill- and biogas engines, steel, glass, paper, automobile, chemical, clay, water cleaning....industry).
As a conclusion, ORC-projects were found being very attractive on renewable energy applications with the help of green power certificates. On non renewable industrial cases, economic feasibility strongly depends from integration costs and electricity prices.
ORC, Organic Rankine Cycle, waste heat recovery, energy efficiency
In our society there is a great demand for mechanical and electric energy. Besides renewable energy sources, such as photovoltaic panels, wind turbines and hydropower, most of our energy is being generated from thermal energy. This thermal power is in general obtained from the combustion of fossil fuels or from nuclear reaction. Depending on the application, different thermodynamic cycles have been developed in practice, leading to serviceable machines and processes. Commonly used are : combustion engines (petrol, gas, diesel), gas turbines, steam turbines (Clausius-Rankine cycle as a specific variation). These processes always use a high temperature heat source and typically achieve a cycle efficiency between 25 and 55%. Still a lot of waste heat is being released in these cycles, often on relatively high temperatures (combustion engines, gas turbines). In case this waste heat can be recovered usefully in a CHP
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