A theoretical and experimental study of typical heterogeneous ice nucleation process on auto windshield under nocturnal radiative cooling and subfreezing conditions

Du, Xuzhi; Yang, Zhigang; Jin, Zheyan; Zhu, Yunqing; Zhou, Zhiwei

doi:10.1016/j.ijheatmasstransfer.2019.03.036

Cited by 10 publications

(16 citation statements)

References 29 publications

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“…This could cause a further decline in the temperature of the windshield. Generally, as observed in our previous study, 21 the external surface of the windshield could be cooled below the temperature and even the saturation point of the air, thus triggering the occurrence of icing. According to Clark and Allen, 23 and Ito and Miura, 24 the general nocturnal radiative heat transfer ( q ″ rad ) from the windshield to the sky can be expressed as…”

Section: Numerical Methodologysupporting

confidence: 68%

“…12 h), a simplified mathematical model with respect to the transient heat conduction as well as the convective and radiative heat transfer was developed based on a small interest region P-C (Figure 2(c)), where the frosting behavior could be generally initiated earlier than the lower region of the windshield. 21 Hence, the region P-C ( 25 × 25 mm ) , located at about 40 mm from the upper edge of the windshield along the symmetry line, 21 could be expected to reveal whether frosting would occur on the windshield to a great extent. In addition, since the region P-C generally exhibited a uniform temperature distribution (Figure 2) during a practical nocturnal cooling process, 21 the present transient heat transfer process was supposed to be described by a two-dimensional model.…”

Section: Numerical Methodologymentioning

confidence: 99%

“…(d) Temperature of the ambient air ( T amb ) and the cabin air ( T car , in ) : Based on our experimental study, 21 the typical temperature variation with time can be expressed by fitting a two-term exponential model as shown below…”

Section: Numerical Methodologymentioning

confidence: 99%

“…In this study, a simplified mathematical model, concerned with transient heat conduction as well as convective and radiative heat transfer, was developed to predict the variations of temperature and supercooling of the windshield during typical and practical nocturnal cooling processes of a car. Based on the conclusion from our previous study 21 (i.e. the arrival of saturation point could be expected to approximately mark the initiation of frosting), final supercooling ( Δ T super f ) was introduced as an indicator to evaluate the probability of occurrence of frosting.…”

Section: Introductionmentioning

confidence: 99%

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A numerical prediction and potential control of typical icing process on automobile windshield under nocturnal radiative cooling and subfreezing conditions

Yang

Jin

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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In this work, a simplified mathematical model, concerned with transient heat conduction as well as convective and radiative heat transfer, was developed to predict the variations of temperature and supercooling of the windshield during practical nocturnal cooling processes of a car. Final supercooling [Formula: see text] was introduced as an indicator to evaluate the probability of occurrence of frosting. Following that, the Taguchi statistical method was used to conduct a parameter sensitivity analysis and then figure out the potential control strategies for frosting suppression. The results showed that relative humidity had the most significant influence on the distribution of supercooling during the nocturnal cooling period, whereas the initial temperature as well as the thickness and thermal conductivity of the windshield played a minor role in it. An increase in relative humidity resulted in a significant increase in [Formula: see text], which might be expected to trigger an earlier initiation of frosting. The emissivity of the windshield, concerned with the nocturnal radiation potential, showed a considerable effect on the response of [Formula: see text], whereas the influence of the total opaque cloud amount appeared to be largely limited. In addition, through a potential control of the thermal conductivity of the windshield, [Formula: see text] just exhibited a very limited decline, thus contributing little to frosting mitigation. However, with a moderate potential control of the internal convective heat transfer coefficient, the frosting behavior might be effectively suppressed under a severe condition that favored the occurrence of icing. Besides, by introducing a combined control of the emissivity of the windshield and the internal convective heat transfer coefficient, [Formula: see text] could be well reduced to a value below zero even as the relative humidity increased up to 90%, which was supposed to prevent the occurrence of frosting under a far severer condition.

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Section: Numerical Methodologysupporting

confidence: 68%

Section: Numerical Methodologymentioning

confidence: 99%

Section: Numerical Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A numerical prediction and potential control of typical icing process on automobile windshield under nocturnal radiative cooling and subfreezing conditions

Yang

Jin

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

Self Cite

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“…The gas-fired combined cold, hot, and electric power supply system can realize the effective use of natural gas, alleviate the problem of power supply shortage, and provide safe and reliable electricity [7]. At present, the combined cold, hot, and electric power supply of gas-fired air conditioners is unstable [8]. In order to make the gas air conditioning get better application, it is urgent to solve the problem of unstable cold, heat, and electricity equipment and lack of system integration technology.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental analysis of thermal energy management system of air source self-powered electric gas generator

Liu

Zhang

2020

THERM SCI

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In order to solve the problem that the auxiliary equipment of electric gas turbine can operate only by relying on external power, and realize the purpose that auxiliary equipment of electric gas turbine can operate independently without the external power grid, in this research, a management system of air source self-powered electric gas generator is proposed. Firstly, the process of the thermal energy management system of the air source self-powered electric gas generator is introduced, and the thermodynamic theory of the thermal energy management system of the air source self-powered electric gas generator is analyzed. Then, the experimental conditions of air source self-powered electric gas generator are introduced. Finally, the results of variable speed and terminal variable flow in heating condition and terminal variable flow in cooling condition of the thermal energy management system of air source self-powered electric gas generator are analyzed. The results show that whether the thermal energy management system of air source self-powered electric gas generator studied in this research is in heating or cooling conditions, both the output power of the engine and the power of the compressor increase with the increase of the rotating speed. It can be concluded from the variable flow results in heating conditions that the smaller the end flow is, the smaller the output power of the engine will be. In this way, the loss of heat transfer efficiency of the plate can be reduced as much as possible, and the users' demand for heat can be met.

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A prediction model of air-source heat pump system performance with frost-retarded heater

Wu,

Sun,

Wang

et al. 2024

Applied Thermal Engineering

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A theoretical and experimental study of typical heterogeneous ice nucleation process on auto windshield under nocturnal radiative cooling and subfreezing conditions

Cited by 10 publications

References 29 publications

A numerical prediction and potential control of typical icing process on automobile windshield under nocturnal radiative cooling and subfreezing conditions

A numerical prediction and potential control of typical icing process on automobile windshield under nocturnal radiative cooling and subfreezing conditions

Theoretical and experimental analysis of thermal energy management system of air source self-powered electric gas generator

A prediction model of air-source heat pump system performance with frost-retarded heater

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