A hybrid approach to predict vertical temperature gradient of ballastless track caused by solar radiation

Shi, Tao; Lou, Ping; Zheng, Weiqi; Sheng, Xia

doi:10.1016/j.conbuildmat.2022.129063

Cited by 17 publications

(1 citation statement)

References 39 publications

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“…The impact of longwave radiation has not been considered in an efficient analytical method for determining the concrete temperature due to the complex nonlinear equation of longwave radiation. Thus, it is necessary to integrate the longwave radiation effect into analytical models of concrete temperature 20 , 39 , 40 .…”

Section: Introductionmentioning

confidence: 99%

Analytical and experimental analysis of concrete temperature and energy considering open-air environmental variations

Yang,

Li,

Zhuo

et al. 2024

Sci Rep

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Longwave radiation is an important open-air environmental factor that can significantly affect the temperature of concrete, but it has often been ignored in the temperature analysis of open-air concrete structures. In this article, an improved analytical model of concrete temperature was proposed by considering solar radiation, thermal convection, thermal conduction and especially longwave radiation. Temperature monitoring of an open-air concrete block was carried out to verify the proposed model and analyze the heat energy characteristics of open-air concrete. As demonstrated by the open-air experiment, under the influence of longwave radiation, the temperature at the top of the concrete block could decrease rapidly at night and even become lower than the minimum temperature at its bottom. Compared with the analytical model that ignores longwave radiation, the improved model that includes it better matches the measured temperature. According to the energy analysis, although solar radiation controls the transient variation in heat energy, the heat exchange caused by longwave radiation were more than that caused by convection on sunlit surfaces, which indicates the importance of considering longwave radiation.

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Section: Introductionmentioning

confidence: 99%