Dynamic heat load calculation of a bridge anti-icing system

Li, Kongqing; Hong, Na

doi:10.1016/j.applthermaleng.2017.09.024

Cited by 16 publications

(3 citation statements)

References 2 publications

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“…e heat flux of HSMP is positive from 10 : 00 to 20 : 00, and the other time is negative. e results are in accordance with Li and Hong [22]. It is necessary to control the heating system to prevent deck surface freezing when HSMP is in a state of heat loss or deck surface temperature is below 0°C.…”

Section: Effect Of Insulationsupporting

confidence: 84%

“…e dynamic temperature field of HSMP during all day is influenced by the external climatic conditions. Li and Hong [22] reported the heat load of HSMP obtained from the dynamic temperature field had an effect on the efficiency of snow melt. erefore, further studies are needed to develop an appropriate control system for the low temperature HSMP system.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Analyses and Responses of Bridge Deck Hydronic Snow Melting System

Feng

Yin

2019

Advances in Civil Engineering

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The hydronic snow melting pavement (HSMP) system is an environmentally friendly, clean, and sustainable alternative to traditional approaches for bridge deck snowmelt. The objective of this paper is to investigate the temperature field and thermal responses of HSMP by a three-dimensional finite element (3D FE) model based on the thermal-fluid coupling method. Considering the full fluid domain, the model simulates the dynamic temperature field and obtains the dynamic heat load of HSMP. Results show that the model factually simulates the decrease of fluid temperature along the pipe. The insulation of bridge deck bottom reduces heat loss, and heating demand can be lowered. Due to the ambient temperature changes, preheating is an effective approach of energy conservation and the start time of heating proposed is at 10 : 00 to 16 : 00. The flow velocity has a slight influence, and the recommended magnitude is 0.6 m/s. The shallower pipe embedded depth and the narrower pipe spacing can improve the surface temperature of HSMP and the uniformity of snowmelt process. Under ambient temperature loads, the maximum principle tensile stress of HSMP is induced at the contact interface between pipes and surrounding concrete, and the magnitude is greater than that of the conventional pavement. Under ambient temperature loads and fluid circulation, heated pipes can effectively prevent thermal shrinkage cracking and extend service life of HSMP. With increase of the pipe embedded depth and decrease of the pipe spacing, the chance of thermal shrinkage cracks decreases. For both optimum snowmelt efficiency and thermal cracking reduction, the pipe embedded depth of 7 cm and pipe spacing of 10 cm are recommended for HSMP with the inlet fluid temperature of 15°C.

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Section: Effect Of Insulationsupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Thermal Analyses and Responses of Bridge Deck Hydronic Snow Melting System

Feng

Yin

2019

Advances in Civil Engineering

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“…The numerical model, which was verified by experimental data, were performed for many variable parameters that affected the anti-icing performance of the HHD system and those were: pipe spacing, burial depth, the fluid and ambient temperatures, thermal conductivity of the first layer of the road, pipe diameter, emissivity, and absorptivity of the surface. Li and Hong [40] aimed to determine the dynamic heat load of a bridge anti-icing system. The results of the simulation showed that the temperature of the bridge surface was higher than 0 • C, and it was suggested that the theoretically generated heating load and control logic were suitable for bridge anti-icing systems.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Economic Analysis of Hydronic-Heated Anti-Icing Solutions on Underground Park Driveways

Kayacı

Kanbur

2023

Sustainability

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Snow and ice forming on the entrance and exit driveways of underground car parks of buildings brings serious difficulties and risks in safe parking for vehicles in winter. Even though traditional methods such as chemical salt and snow plowing reduce slippery conditions on driveways, they also result in infrastructure- and environment-related damages. Hydronic heating is an alternative way to prevent snow and ice forming; thereby, the hydronic heating driveway (HHD) is a promising technique for energy-efficient and environment-friendly solutions. This study presents a time-dependent three-dimensional numerical heat transfer model for HHD applications with realistic boundary conditions and meteorological data in the MATLAB environment. After developing the numerical heat transfer model, the model is applied to a case study in Istanbul, Turkey and followed by an economic comparison with the commercial electrically-heated driveways (EHD) method that is applied in two different ways; applying the electric cables in (i) whole driveway and (ii) only tire tracks. Different escalation rates in natural gas and electricity, hot fluid inlet temperature, air temperature, and the number of parallel pipes are the main parameters in the case study. Results show that the decrease in pipe spacing drops the investment cost term but it needs a higher supplied fluid temperature for anti-icing, and therefore the operating cost term increases. Among other cases was the number of parallel pipes, with 50 being the most economically feasible solution for all air temperatures ranging from 0 °C to −10 °C. The economic comparison shows that the EHD with only tire tracks has the minimum total cost as it significantly decreased both the operating and investment cost terms. In case of an anti-icing requirement on the whole road surface, the HHD system was found to be preferable to the EHD whole driveway scenario at air temperatures of 0 °C and −5 °C, while it is more beneficial only for the high electricity escalation rates at the ambient temperature of −10 °C.

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