Transient dynamic modeling and validation of an organic Rankine cycle waste heat recovery system for heavy duty diesel engine applications

• Published in: Applied energy Vol. 205; pp. 260 - 279
• Main Authors: Xu, Bin, Rathod, Dhruvang, Kulkarni, Shreyas, Yebi, Adamu, Filipi, Zoran, Onori, Simona, Hoffman, Mark
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.11.2017
• Subjects: Dynamic finite volume heat exchanger modeling; Heavy duty diesel engine; Organic Rankine cycle; Transient operation; Waste heat recovery; Transient operation; Dynamic finite volume heat exchanger modeling; Waste heat recovery; Organic Rankine cycle; Heavy duty diesel engine
• ISSN: 0306-2619; 1872-9118
• DOI: 10.1016/j.apenergy.2017.07.038

[Display omitted] •A parallel evaporator organic Rankine cycle Simulink® model is presented.•Component models are calibrated and validated with experimental data.•Integration and quasi-transient validation of the component models are given.•Co-simulation of organic Rankine cycle and heavy-duty diesel engine models.•Integrated model capability is demonstrated over a transient driving cycle. This paper presents a dynamic organic Rankine cycle waste heat recovery (ORC-WHR) Simulink® model and an engine model for heavy-duty diesel applications. The dynamic, physics-based ORC-WHR system model includes parallel evaporators, flow control valves, a turbine expander, a reservoir, and pumps. The evaporator model contains an enhanced pressure drop model, which calculates pressure drop for each working fluid phase via a linear relation to the axial location inside each phase. The ORC-WHR component models parameters are identified over large range of steady state and transient experimental data, which are collected from an ORC-WHR system on a 13L heavy-duty diesel engine. The component models are integrated into an entire system model and the boundary conditions, inputs and outputs for the individual models are described. A GT-POWER® engine model and its transient validation is presented. The speed and torque profiles of a long-haul, constant speed variable-load heavy-duty cycle are processed through the engine model to produce the exhaust and recirculated exhaust gas transient conditions relevant for the ORC model. The ORC-WHR system then simulated over these highly transient engine conditions. Overall, this paper provides detailed guidelines for ORC-WHR system modeling, model calibration, and component models integration.