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5 Waste heat recovery applications of ORC One new method of recovering waste heat in industries is to use low maintenance and safe ORC technology. It is known that most of processes have waste heat of less than 400‐500°C which gives an abundant potential for ORC usage. Supply of heat for absorption chillers in addition to electricity production with no more fuel consumption is the advantages of this power generation method. As a result all produced electricity from ORC waste heat recovery will contribute to reduce some emissions same as CO2, SOx, etc, in an indirect way. Trends for having more waste heat recovery units will be enhanced when more energy prices are in the scene. Moreover, cost evaluation of waste heat recovery systems are better to be investigated through their life cycle rather than their initial cost. In this section waste heat recovery in steel, ceramic, and cement industries and also vehicles will be investigated. Waste heat recovery from exhaust gases of diesel engines have been studied in details by author in another project.24 A summary is brought here: “There exist many options for obtaining better performance and more efficiency for engine based power generation. Wartsila is a leading manufacturing of internal combustion engines (ICE) used for power generation and is seeking various system options for increasing efficiency out of their plants. Project Group D of the Applied Energy Course Spring 2010 at KTH is tasked with exploring this topic for Wartsila. The company has already investigated into a few alternatives and the use of an Organic Rankine Cycle (ORC) is been deemed one such option. This sub‐group of project group D is tasked with the optimization of an ORC cycle to be used as a bottoming cycle in a Wartsila’s ICE power plant design. Organic Rankine Cycles are used for a wide variety of applications and various design options can be tailored to best optimize a certain scenario. A design and cycle optimization was carried out to fit the specifications given by the industry client. First, a research and literature survey was carried to explore various possibilities in designing an ORC. With this background and comprehension, various proposed layouts given by the client were then analyzed and modeled with the software Engineering Equation Solver (EES). After coming to conclusions about operating conditions and configuration for these proposed layouts, recommendations and suggestions were made in and to improve the overall ORC design. We have found that although the Organic Rankine Cycle has the same principle of operation to the steam Rankine Cycle, it has many different considerations due to the special application of waste heat recovery. Our 24 Gordon Denbow, Reza Rowshanzadeh, Andrew Tabije, Andrea Pla Rubio, Maria Chuvashova, Sara Ghaem, Amir Sohani, Adel Mikanik; available at: http://docs.google.com/fileview?id=0B5svs7AVkUW4NTk5M2UyMWYtZjk3NS00MzAxLWI4NzItODZlOTJjM2YxMjNl&hl=en &authkey=CLOMw‐EI; as accessed: 07.07.2010. 29PDF Image | Exergy
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