Abstract
By comparing defrosting CFD steady-state, transient simulation and vehicle climate test results, the method of predicting transient defrosting time by steady-state analysis is proposed, and the structure of defrosting air duct is optimized. The model setting and evaluation method of steady-state defrosting analysis are used to shorten the optimization time and improve the working efficiency. The results show that the proposed method is feasible and can be used to guide the structural optimization in the early stage of the project and greatly shorten the optimization time.
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Abbreviations
- \(A\) :
-
Surface area (m2)
- \(c_{p}\) :
-
Specific heat [J/(kg K)]
- \(C_{\text{emp}}\) :
-
Coefficient of heat absorption for ice
- \(h_{\text{ext}}\) :
-
Heat transfer coefficient [W/(m2Â K)]
- \(h_{s} \left( {T_{\text{ice}} } \right)\) :
-
The enthalpy at the corresponding temperature of the ice layer (J/kg)
- \(h_{L} \left( {T_{F} } \right)\) :
-
The enthalpy at the corresponding freezing temperature after melting into water (J/kg)
- \(L\) :
-
Latent heat flux (W)
- \(Q_{\text{ext}}\) :
-
Heat flux (W)
- \(q\) :
-
Heat conduction of glass into ice (W)
- \(s\) :
-
Ice thickness (m)
- \(T_{\text{ext}}\) :
-
Ambient temperature (K)
- \(T_{\text{ice}}\) :
-
Ice temperature (K)
- \(T_{F}\) :
-
Freezing point temperature (K)
- \(\rho_{s}\) :
-
Ice layer density (kg/m3)
References
Journals
Feng D, Zhengqi G, Yi Y et al (2009) Numerical simulation analysis on defrosting and defogging for automotive windshield. Automot Eng 31(2):175–179
Zhou A, Wang S, Liu J (2012) Computational fluid dynamics simulation of auto defrosting. Automobile Technol 12:51–53
Monograph
Dynamic Versteeg HK (2010) An introduction to computational fluid dynamic: the finite volume method. World Publishing Company, Beijing
Patankar SV (1984) Numerical calculation of heat transfer and fluid flow. Zhang Zheng. Science Press, Beijing
Wang F (2004) Computational fluid dynamics analysis: Principles and applications of CFD software. Tsinghua University Press, Beijing
Collected Papers
Hu Z, Shi D, Zhang J, Zou J The deicing analysis of vehicle based on STAR-CCM+[C]
Website
Others
GB 11555-2009, Motor vehicles-windshield demisting and defrosting systems performance requirements and test methods [S]
STAR-CCM+User Guide
Acknowledgements
This work was conducted as part of the large SUV development project; the authors gratefully acknowledge the project partners for their contribution and assistance. The authors would also like to thank the environmental simulation test chamber colleagues for their help and the editorial board of Automotive Innovation for their guidance opinions.
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Zhang, C. (2019). Research on CFD Steady-State Simulation Analysis and Optimization for Defrosting of Passenger Vehicles. In: (SAE-China), S. (eds) Proceedings of the 19th Asia Pacific Automotive Engineering Conference & SAE-China Congress 2017: Selected Papers. SAE-China 2017. Lecture Notes in Electrical Engineering, vol 486. Springer, Singapore. https://doi.org/10.1007/978-981-10-8506-2_4
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DOI: https://doi.org/10.1007/978-981-10-8506-2_4
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