N2 - The evaporation temperature is regarded as one of the major parameters influencing the organic Rankine cycle (ORC) efficiency. Majority of contributions in literature for ORC cycle analyses treat the heat source as if it had an infinite heat capacity. Such analyses are not valuable as the resulting temperature drops of the heat source needs to be small. That leads to the fact that the heat source is not well explored and in the case of waste heat utilization it can prove the poor economics of the ORC. In the present study cooperation of the ORC cycle with the heat source available as a single phase or phase changing fluids is considered. The analytical heat balance models have been developed, which enable in a simple way calculation of heating fluid temperature variation as well as the ratio of flow rates of heating and working fluids in ORC cycle. The developed analytical expressions enable also calculation of the outlet temperature of the heating fluid. L1 - http://journals.pan.pl/Content/94423/PDF/04_paper.pdf L2 - http://journals.pan.pl/Content/94423 PY - 2013 IS - No 3 September EP - 73 DO - 10.2478/aoter-2013-0015 KW - Organic Rankine Cycle KW - Heat supply KW - Energy efficiency A1 - Mikielewicz, Dariusz A1 - Mikielewicz, Jarosław 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 - 2013 T1 - On the efficient use of a lowtemperature heat source by the organic Rankine cycle SP - 61 UR - http://journals.pan.pl/dlibra/publication/edition/94423 T2 - Archives of Thermodynamics