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COBEM 2021
26th International Congress of Mechanical Engineering
Thermodynamic simulation of an electric variable speed scroll compressor for automotive air-conditioning
Submission Author:
Ernane Silva , SC
Co-Authors:
Vinicius Pereira Dall Agnol Alves, Ernane Silva
Presenter: Vinicius Pereira Dall Agnol Alves
doi://10.26678/ABCM.COBEM2021.COB2021-1170
Abstract
Nowadays, electric vehicles are seen as an alternative to reduce greenhouse gas emissions and as such it is expected that at least 20% of the whole world's road transportation will be electrified by 2030. However, there are still many technological challenges to overcome in this field with the need to increase mileage as one of the most significant, requiring the development of novel materials and a more efficient use of energy. In this sense, it is important to look at the vehicle subsystems and identify opportunities to reduce energy consumption. The air-conditioning system, for instance, is of particular importance given that it is generally the largest subsystem of a vehicle and responsible for a significant amount of the energy consumption. Currently, electric vehicle manufacturers adopt electric variable speed scroll compressors in such systems due to their high efficiency and low noise. Understanding how this component is affected by different physical phenomena, such as leakage and heat transfer, according to the operating condition is of paramount importance to further improve the efficiency of electric vehicles. This paper describes the thermodynamic simulation of an electric scroll compressor used for automotive air conditioning applications using a comprehensive compressor simulation model. The numerical model is based on the conservation of mass and energy inside the compression chamber with correlations for leakage and heat transfer. The mass flow rates from the suction plenum and through the discharge orifice are treated as isentropic flows with adjustment parameters to better describe the real condition. The results include predictions of mass flow rate, discharge temperature and indicated power for different operating conditions and different speeds. A comparative analysis including instantaneous leakage and heat transfer rates is also provided. The numerical model is able to make predictions at low computational cost, which makes it useful for optimization purposes.
Keywords
scroll compressor, Automotive Air Conditioning, thermodynamic analysis
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