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Experimental research of a pumping engine in a micro-ORC system with a low-boiling medium

Kaczmarczyk Tomasz Z.

Archives of Thermodynamics

2024

Vol. 45, no. 4

125--140

The paper presents the results of experimental research on a pumping engine with the low-boiling medium HFE-7100. The research was conducted in a micro-ORC system with an output of about 2.5 kWe. Among other factors, the impact of working medium temperature and pump rotational speed on the operating parameters of the gear pump and pumping engine is analyzed. The research shows that increasing the rotational speed and HFE-7100 temperature resulted in an increase in the power consumed by the pump drive and an increase in the effective power of the pump. The increase in the effective power of the pump was greater than the electrical power consumption of the pump drive, resulting in an increase in the volumetric efficiency of the pump. It has been established that, at a constant pump rotational speed of 2000 rpm, increasing the average temperature of HFE-7100 by 27 K from approximately 304 K resulted in a 4% increase in the pump's volu-metric efficiency to 80%. It has been established that, for any value of pump rotational speed and working fluid tempera-ture, there exists an optimal effective power value for the pump at which the pumping engine achieves the maximum efficiency.