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A System-Level Approach to the Development of Optimized Waste Heat Recovery Exhaust Evaporators
Technical Paper
2018-01-1365
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This work presents a system-level methodology developed to identify the optimum design of heat exchangers for Organic Rankine Cycle (ORC) Waste Heat Recovery Systems (WHRS) for automotive applications. The optimization of the evaporators is done following an iterative system-level approach, where system and vehicle outputs, such as the Fuel economy (FE) and the System Payback Period are the objects of study. A 1D software has been developed to run an algorithm that, fed with corroborated assumptions, calculates the efficiency of the ORC cycle, the WHRS power output, the WHRS payback period, the FE potential and the Fuel Savings per year - hereby FSPY - for different sets of evaporator designs. The algorithm identifies the optimum trade-off for evaporator efficiency, pressure drop, weight and cost to maximize the system FSPY. The concept of the evaporator is a counter cross-flow heat exchanger; this is, the exhaust gas flows all along the outer case across the internal tubes. The working fluid flows within the tubes transversally in a meander path, in an overall counter current arrangement. There are several geometrical parameters open for optimization, such as the evaporator aspect ratio, cross section vs. length trade-off, arrangement of the tubes, shape of the outer case, number and diameter of the tubes, corrugation of the tubes, transversal and longitudinal corrugation pitch, etc. The resultant performance, size, weight and cost of the heat exchanger depend on which set of parameters is chosen. Moreover, every resultant heat exchanger output is linked in such a way that the optimum trade-off is not trivial.
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Folgueira, A., Teniente, J., and Carballido, R., "A System-Level Approach to the Development of Optimized Waste Heat Recovery Exhaust Evaporators," SAE Technical Paper 2018-01-1365, 2018, https://doi.org/10.4271/2018-01-1365.Data Sets - Support Documents
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References
- Spears , M. Looking Ahead to the Next Phase of Heavy-Duty Greenhouse Gas and Fuel Efficiency Standards National Highway Traffic Safety Administration U.S. Environmental Protection Agency 2014
- Jääskeläinen , H. Engine Exhaust Back Pressure DieselNet.com 2007
- Lemmon , E.W. , Huber , M.L. , and McLinden , M.O. “NIST Standard Reference Database 23: Reference Fluid Thermodynamic and Transport Properties-REFPROP, Version 9.1,” National Institute of Standards and Technology Gaithersburg Standard Reference Data Program 2013
- Fregoso , K. , Baker , F. , Chang , H. , Florez , E. , and Magtoto , M. Engine/Powerplant and Drivetrain Optimization. Vehicle/Trailer Efficiency Truck Technology Assessment Workshop 2014
- Yebi , A. , Xu , B. , Onori , S. , Hoffman , M. et al. Nonlinear Model Predictive Control Strategies for a Parallel Evaporator Diesel Engine Waste Heat Recovery System Minneapolis ASME Dynamic Systems and Control Conference 2016
- Hill , N. Light Weighting as a Means of Improving Heavy Duty Vehicles’ Energy Efficiency and Overall CO2 Emissions Ref: CLIMA.C.2/FRA/2013/0007 2013
- Shah , M. Chart Correlation for Saturated Boiling Heat Transfer: Equations and Further Study ASHRAE Trans. 88 1982 185 196 1982
- Kim , S. and Mudawar , I. Universal Approach to Predicting Saturated Flow Boiling Heat Transfer in Mini/Micro-Channels - Part II. Two-Phase Heat Transfer Coefficient International Journal of Heat and Mass Transfer 64 1226 1238 2013 10.1016/j.ijheatmasstransfer.2013.04.016