Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (2): 523-530.doi: 10.13229/j.cnki.jdxbgxb20210671

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Study on heat transfer characteristics of electric heating snow melting asphalt pavement

Zhuang-zhuang LIU1,2(),You-wei ZHANG1,Peng-yu JI1,Abshir Ismail Yusuf1,Lin LI1,Ya-zhen HAO1   

  1. 1.School of Highway，Chang'an University，Xi'an 710064，China
    2.Key Laboratory of Special Area Highway Engineering，Ministry of Education，Xi'an 710064，China
  • Received:2021-07-16 Online:2023-02-01 Published:2023-02-28

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Abstract:

A two-dimensional heat transfer model was established using the finite element numerical simulation approach to investigate the heat transfer characteristics and its influence law of electric heating snow-melting asphalt pavement. The impact of heating system design parameters（layout spacing， embedding depth， and input power） and environmental parameters（wind speed， ambient temperature） on surface temperature distribution and heating rate of the pavement was investigated， and the accuracy and effectiveness of the model are verified by the measured data of the test section. The results revealed that the two-dimensional heat transfermodel can predict road surface temperature of electrothermal snowmelt asphalt pavement well in an accurate level， with an average maximum absolute error of 1.1 °C， an average accuracy of 88.1%， and a maximum accuracy of 96.6%. Among all the factors， layout spacing is the most important factor affecting the temperature uniformity of the road surface， followed by embedding depth. Input power and environmental factors mainly affect the temperature rising rate and the maximum temperature of electrothermal snowmelt asphalt pavement.

Key words: road engineering, snowmelt pavement, numerical simulation, heat transfer model, design parameters, environmental factors

CLC Number: 

  • U421.4

Fig.1

Diagram of model domain"

Table 1

Simulation model parameters"

参数名称数值
热导率/［W·（m·K）-1］1.24
密度/（kg·m-3）2420
恒压热容/［J·（kg·K）-1］900
长度/cm30
高度/cm8

Fig.2

Temperature distribution of structures with different spacing"

Fig.3

Average temperature of road surface with different spacing"

Fig.4

Temperature map of each point of road surface with different spacing"

Fig.5

Temperature map of road structure with different embedding depth"

Fig.6

Average temperature of road surface with different depth"

Fig.7

Temperature map of each point of road surface with different embedding depth"

Fig.8

Temperature distribution of road structure with different input power"

Fig.9

Temperature distribution diagram with different wind speed"

Fig.10

Temperature distribution of road structure with different ambient temperatures"

Fig.11

Diagram of Temperature distribution with different ambient temperature"

Fig.12

Comparison between simulated results and observed data"

Table 2

Module accuracy"

模块精度/%最大绝对误差/℃
平均值88.10.7
模块195.60.2
模块291.30.6
模块386.80.8
模块473.41.1
模块585.30.9
模块696.60.5
模块788.60.9
模块893.00.7
模块975.51.1
模块1094.50.6
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