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It was noted that regenerator usage is interesting in dry fluids and where fixed heat source is introduced. However, even in these cases, better efficiency may not compensate the cost of regenerator. More evaporator pressure gives better efficiencies. Pinch point temperatures, heat exchangers cost, critical temperature of working fluid would be a restriction for maximum working pressure of cycle. Consequently, optimum working pressure for cycle should be chosen. ORC as in CHP or Trigeneration units are options to improve total efficiency and reduce the cost. For each ORC application, power and temperature range, best fluid can be chosen. For small scale solar CHP, Benzene series gives best results. Optimization of ORC for cooling purposes showed that among five different fluids, R227ea give most cooling and ORC power. More working pressure was interesting while pinch point temperature is well kept above zero. Future work Each discussed application of ORC can be optimized based on same procedure which has been used in this project and the result can have a great impact on performance improvement and cost reduction of that specific application. This will give great potentials for a sophisticated power generations method with minimal environmental negative impacts. There are opportunities to investigate each of aforementioned ORC applications in much more detailed and applied manner in further research activities. To name a few, heat recovery from slag in steel industry or internal combustion engines, Nano‐structured metal‐organic working fluids, geothermal or solar based cost effective ORC plants, efficient biomass based ORCs, micro ORCs.etc, are candidates for more research activities. References: 1 U. Drescher, D. Bruggemann, Fluid selection for the organic Rankine cycle (ORC) in biomass power and heat plants, Applied Thermal Engineering 2007; 27: 223–228. 2 Paola Bombarda a, Costante M. Invernizzi, Claudio Pietra, Heat recovery from Diesel engines: A thermodynamic comparison between Kalina and ORC cycles, Applied Thermal Engineering 2010; 30: 212‐219. 3 Phil Welch, Patrick Boyle; available at: http://www.energent.net/documents/Geothermal_ Resources_Council_2009_Paper.pdf; as accessed: 07.05.2010. 4 Nathanael Baker; available at: http://www.energyboom.com/category/tags/mohcs ; as accessed: 01.06.2010. 5Wikipedia, the free encyclopedia; available at: http://en.wikipedia.org/wiki/Organic_Rankine_Cycle #References; as accessed: 19.06.2010. 6 Sylvain Quoilin and Vincent Lemort; available at: http://www.labothap.ulg.ac.be/cmsms/uploads/File /ECEMEI_PaperULg_SQVL090407.pdf; as accessed: 01.05.2010. 7 Sylvain Quoilin and Vincent Lemort; available at: http://www.labothap.ulg.ac.be/cmsms/uploads/File 78PDF Image | Exergy
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