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Publication Title | Cogeneration in Small Scale – High Speed Microturbines Dynamic Analysis

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ARCHIVES OF ACOUSTICS DOI: 10.2478/v10168-010-0016-2 Arch. Acoust., 35, 2, 175–182 (2010)

Cogeneration in Small Scale – High Speed Microturbines Dynamic Analysis

Jan KICIŃSKI

University of Warmia and Mazury in Olsztyn Institute of Fluid-Flow Machinery

Polish Academy of Sciences

Fiszera 14, 80-952 Gdańsk, Poland

e-mail: kic@imp.gda.pl

(received May 6, 2010; accepted May 14, 2010)

Main energy conversion machinery used and to be used in cogeneration systems are schematically described. Some assets of the distributed generation are pointed out and small-scale cogeneration systems designed for energy units of distributed cogeneration are described.

In the small scale, turbines and bearings are a source of specific problems con- nected with securing stable rotor operation. Accepted has been two kinds of high speed micro-turbines of electric power about 3 KW with multistage axial and radial rotors supported on foil bearings. A concept which becomes more and more attrac- tive takes into account a low-boiling agent, which is normally used in the thermal cycle of the micro-turbine, as the lubricating liquid in the bearings (so-called ORC based systems). Of some importance is the operation of these machines at a low noise emission level, sine being parts of the household equipment they could disturb the calm of the residents. The scope of the present article is limited to the discus- sion of dynamic characteristics of the selected design. The properties of the rotor combined with slide bearings (foil bearings in this particular case) were taken under investigation. A combination of this type is a certain novelty since a typical modal analysis of such objects refers to a rotor itself. Analysing the dynamic state of the “home” power plants requires qualitatively novel research tools.

Keywords: cogeneration, micro-turbines, rotor dynamics. 1. Introduction

Cogeneration is a simultaneous production of electric energy and heat which leads to a more efficient utilisation of primary energy. Thus, cogeneration brings considerable savings in the final energy production and contributes to the de- crease of the level of emissions into the environment, especially of CO2. The opportunities for cogeneration are however usually determined by the demand

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