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Simulation of a VRF system applied in electric buses in Taiwan.

Number: pap. 2407

Author(s) : LIEBOLD A., LIN P. H., VETSCH B., et al.

Summary

Based on test data from an electric bus manufacturer, HVAC systems consume nearly 30% of the available energy, which heavily decreases the bus mileage. Therefore, improvements of the bus HVAC system design are needed. In contrast to conventional HVAC systems for electric buses, the aim of this paper is to integrate and simulate a VRF (variable refrigerant flow) system as HVAC system. The applied compressors provide adequate power, depending on the requirements of distributed heat exchanger units inside the bus cabin. This system provides either cooling or heating capacity depending on the need of the target space. Therefore, the energy consumption of the compressor will be reduced. The simulation results show that the target temperature of 22°C and relative humidity of 50% can easily be reached with a VRF system for the complete bus. In conventional HVAC systems comfort in the middle of the bus will be reduced. Those systems usually use one big evaporator in the back of the bus which is used to cool down the passenger room, to set temperature. The electrical energy consumption is very important for the mileage of an electric transportation bus. When a VRF system is used as AC system the total electrical power of the compressor can be reduced by 12% compared to the state of the art system as the simulation results show. The passenger comfort can be increased significantly due to the more continuous temperature distribution inside the bus. Thanks to the dynamic simulation model developed in this study the optimal design specifications of the VRF HVAC system can be predicted and evaluated.

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Pages: 10 p.

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Details

  • Original title: Simulation of a VRF system applied in electric buses in Taiwan.
  • Record ID : 30018828
  • Languages: English
  • Source: 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2016/07/11

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