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Session: Parallel Session: Prototypes and Experiments
Session starts: Friday 23 September, 09:00
Presentation starts: 09:40
Room: Auditorium

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Krzysztof Kosowski ()

Abstract:
ABSTRACT The micro steam turbines have found their applications in the micro-power plants, including the poly-generation power systems and the combined gas-steam installations. Apart from the traditional medium, i.e. water vapour, also low-boiling media, as a rule, organic ones, are applied. On the market the co-generation systems working with organic media are already available, however only a few examples can be found of ORC installations of output power smaller than 100kW. The problems faced by designers of such turbines are associated with very small volume flow rate of working medium which leads to small values of blades’ height and high values of rotor speed, up to hundred thousand rpm or more. The co-generative micro-power plant with the HFE7100 as a working medium was designed and built for experimental investigations. The values of the main cycle parameters were as follows: - heat output: 20 kW, - electric output: 3kW - medium mass flow rate: 0.017kg/s, - the pressure at turbine inlet: 1200kPa, - the temperature at turbine inlet: 162oC, - the pressure behind the turbine: 119kPa (the saturation temperature equal to about 65 oC). In PART A a description of the experimental power plant is presented. Special attention is paid to the advanced design of the main elements of the power plant: a boiler, heat exchangers, a pomp and a turbine generator. The results of the preliminary experimental research are given and analysed. In PART B a design of a multi-stage micro-turbine with partial admission of all the stages is described in detail and the results of the particular experimental investigations and numerical calculations are shown, followed by an appropriate discussion and conclusions. It is worth emphasising that the turbine efficiency is higher than 80%.