Convegni ATI - Accesso riservato soci CTI

Autore: F. Armanasco, L.P.M. Colombo, G. Corbella, M. Marzoli

Collana: CA - 63 - Palermo 2008

Note:
Experimental results on a thermodynamic characterization of a micro-co-generative plant to assess performances under a variable thermal demand are presented in this paper. The generator is a microturbine Turbec T100-CHP integrated in a heat recovery system. For operation in standard conditions the maximum electrical and thermal power generated are respectively 105 and 167 kW. Operative conditions were realized by setting the set-point temperature at the outlet of the micro-turbine in the range 60 – 90°C, with 5°C step. Starting from an electrical power set-point, ranging between 60 and 100 kW, with 10 kW step, the heating power dissipated was varied in the range 70 – 170 kW, with 10 kW step. In every operating condition the measurement system allows the real-time calculation of the quantities needed for the energetic characterization of the plant,
such as efficiency indices and PES (Primary Energy Saving index). The investigation of the effect of a variable thermal load at fixed electrical power set-point and water outlet temperature has shown that the machine can meet thermal demand by varying
its rotation regime: transient duration is approximately a quarter of an hour. Energetic performances at partial thermal loads have been found of course to decrease: the electrical efficiency lose up to about 7% and thermal efficiency drop can be up to
about 20%; nevertheless, the minimum first principle total efficiency ranges between 0.6 and 0.8 for all the investigated conditions.