Experimental investigation into the influence of heat source power on the performance of a scroll expander in an organic Rankine cycle system using HFE-7100 fluid.

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Bibliographic Details
Title:	Experimental investigation into the influence of heat source power on the performance of a scroll expander in an organic Rankine cycle system using HFE-7100 fluid.
Authors:	Kaczmarczyk, Tomasz Zygmunt¹ tkaczmarczyk@imp.gda.pl
Source:	Archives of Thermodynamics. 2026, Vol. 47 Issue 1, p125-136. 12p.
Subjects:	Electric power, Working fluids, Flow velocity, Rankine cycle, Electric generators, Power (Mechanics)
Abstract:	This work presents the results of an experimental study on a 1 kW scroll expander in an organic Rankine cycle (ORC) system. The low-boiling, non-flammable hydrofluoroether HFE-7100, was used as the working fluid. The research was conducted at heat source power levels ranging from 10 kWt to 18 kWt. The flow rate of the working medium was in the range of 30 g/s to 60 g/s. The generator of the expansion unit, on the other hand, was loaded with electrical receivers, with a load ranging from 200 We to 2000 We. The study shows that, for the same working fluid flow rate and expander rotational speed, an increase in the thermal power of the heat source resulted in higher voltage at the generator terminals and increased electrical output power of the ORC system. It was found that, regardless of the HFE-7100 flow rate, the inclination angles of the electrical power and voltage curves with respect to the expander’s rotational speed axis increased as the thermal power of the heat source increased. Thus, for each level of a thermal power, there is an optimum generator load at which the electrical output power of the system is maximised. The research conducted shows that the maximum electrical output of 635 We was obtained for a heat source power of 16 kWtand a fluid flow rate of 60 g/s. In addition, it was found that for the tested ranges of heat source power and HFE-7100 flow rate, the optimum load for the expander generator was between 3.5 Ω and 4.8 Ω. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	This work presents the results of an experimental study on a 1 kW scroll expander in an organic Rankine cycle (ORC) system. The low-boiling, non-flammable hydrofluoroether HFE-7100, was used as the working fluid. The research was conducted at heat source power levels ranging from 10 kWt to 18 kWt. The flow rate of the working medium was in the range of 30 g/s to 60 g/s. The generator of the expansion unit, on the other hand, was loaded with electrical receivers, with a load ranging from 200 We to 2000 We. The study shows that, for the same working fluid flow rate and expander rotational speed, an increase in the thermal power of the heat source resulted in higher voltage at the generator terminals and increased electrical output power of the ORC system. It was found that, regardless of the HFE-7100 flow rate, the inclination angles of the electrical power and voltage curves with respect to the expander’s rotational speed axis increased as the thermal power of the heat source increased. Thus, for each level of a thermal power, there is an optimum generator load at which the electrical output power of the system is maximised. The research conducted shows that the maximum electrical output of 635 We was obtained for a heat source power of 16 kWtand a fluid flow rate of 60 g/s. In addition, it was found that for the tested ranges of heat source power and HFE-7100 flow rate, the optimum load for the expander generator was between 3.5 Ω and 4.8 Ω. [ABSTRACT FROM AUTHOR]
ISSN:	12310956
DOI:	10.24425/ather.2026.158664