N2 - In the paper presented are experiences from operation of three different expansion devices for possible implementation in the domestic micro CHP. These were the modified scroll expander and two designs based on the variable working chamber volume pneumatic devices. Experiments showed the superiority of both "pneumatic devices" over the scroll expander, indicating the possible internal efficiencies in the range of 61 82Such efficiencies are very attractive, especially at the higher end of that range. The volume of these devices is much smaller than the scroll expander which makes it again more suitable for a domestic micro CHP. Small rotational velocities enable to conclude that connection to electricity grid will also be simpler in the case of "pneumatic devices". The "pneumatic devices" under scrutiny here could be an alternative to the typical vapour turbine in the ORC cycle, which is in the process of development at the IFFM. L1 - http://journals.pan.pl/Content/94153/PDF/01_paper.pdf L2 - http://journals.pan.pl/Content/94153 PY - 2010 IS - No 4 October EP - 13 DO - 10.2478/v10173-010-0023-8 KW - Mcro CHP KW - Expansion devices KW - Central heating A1 - Mikielewicz, Dariusz A1 - Mikielewicz, Jarosław A1 - Wajs, Jan PB - The Committee of Thermodynamics and Combustion of the Polish Academy of Sciences and The Institute of Fluid-Flow Machinery Polish Academy of Sciences DA - 2010 T1 - Experiences from operation of different expansion devices for application in domestic micro CHP SP - 3 UR - http://journals.pan.pl/dlibra/publication/edition/94153 T2 - Archives of Thermodynamics