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8722984 
Meetings & Symposia 
On bottoming a micro turbine with a micro ORC section: Part b) micro-combined-cycle plant performance evaluation 
Micheli, D; Reini, M 
2007 
Universita degli Studi di Padova 
2 
1035-1041 
English 
In the last years, a big effort has been undergone to improve microturbines thermal efficiency, actually rated at about 30%. A value of 40% is often regarded as a possible target. Such a result could be achieved implementing more complicated thermodynamic cycles, like combined cycles. The paper deals with the hypothesis of bottoming a low pressure ratio, recuperated gas cycle, typically realized in actual microturbines, with an Organic Rankine Cycle (ORC), obtaining a micro-combined-cycle plant. On the basis of the expander isentropic efficiencies values obtained in the first part of the work, the object of this second part is to evaluate the expected nominal performance parameters of the whole micro-combined-cycle plant. The micro turbine (topper) is rated at the typical value of 100 kW, while the micro ORC section (bottom) is generally rated at less than 25 kW. Both recuperated and not recuperated bottom cycle options are discussed, considering cyclohexane as working fluid and various vapour pressure and stack temperature of the microturbine exhaust gases. 
Micro-combined-cycle; Microturbines; Organic Rankine Cycle (ORC) 
Lazzaretto, A.