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Innovative architecture to valorize the waste heat of a passenger car through the use of a Rankine cycle.

Number: pap. 2335

Author(s) : DUMONT O., ZIVIANI D., BRAUN J. E., et al.

Summary

It is well known that passenger car gasoline engines have large thermal energy losses (roughly 60% between engine coolant and exhaust gases). This paper presents a new architecture for an organic Rankine cycle that uses the engine coolant as the cycle working fluid and exploits waste heat from both the coolant and exhaust gases. This configuration has the potential for lower cost, complexity, and environmental impact compared to conventional approaches. The main losses of the proposed system are taken into account in the analysis: under and overexpansion of the expander, by-pass flow, and finite heat exchange. Two working fluids are considered: a mixture of water and ethanol and a mixture of glycol and water. The cooling engine loop maximum pressures and temperatures are limited to 20 bars and 200°C based on new improvements for passenger vehicles. A parametric analysis is performed using the simulation that to identify the main losses of the proposed architecture and determine optimal control variables (fraction of by-pass flow and pressure) that lead to the best performance. Performance is presented as a function of the speed of the vehicle and results show that greater benefits in terms of fuel consumption are realized for speeds higher than 75 km/h. In addition, the consumption improvements are analyzed for two standard driving cycles (WLTP and NEDC) and are compared with other classical architectures. The maximum reduction in energy consumption for the WLTP cycle is estimated to be 6% for optimal control.

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Pages: 10

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Details

  • Original title: Innovative architecture to valorize the waste heat of a passenger car through the use of a Rankine cycle.
  • Record ID : 30024509
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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