Abstract
In the paper, a hydraulic retarder based organic Rankine cycle (ORC) system is investigated. In order to achieve stable oil output temperature in the evaporator under different hydraulic retarder operating conditions, evaporating pressure is studied to match with a specified evaporator heat transfer area through iterative calculations. An experiment test is a setup to conduct the validation. The results show that regulating evaporating pressure can achieve a target evaporator oil output temperature. However, expander load moment and working fluid mass flow rate (MFR) need to be controlled precisely. With the increase of retarder rotor speed, required evaporating pressure generally decreases, while working fluid MFR increases dramatically. Effects of the changed evaporating pressures and MFR s on expander power output increases from 2.52 kW to 31.43 kW, while cycle thermal efficiency changes slightly in low filling rate condition, from 10.2% to 10.7% for 25% filling condition.
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