| In the northern region of China, the accumulation of snow in winter on the pavement o ften c auses t raffic ac cident, Snow-clearing a t th e imp ortant lo cations such as the freeway, pedestrian bridge, ramp and airfield runway has an important practical significance t o e nsure r oad t raffic s afe a nd unbl ocked. Traditional snow-melting methods have respective shortcomings which make them restricted in engineering a pplications. In pa rticular, m any countries a nd r egions forbid us ing snowmelt agent because of its negative impact to the environment. Snow-melting on pavement based on ground source heat pumps achieves that the snow on pavement be melt in winter and the pavement be cool in winter to reduce asphalt softening with the cold water. It is efficient, energy saving and environmental friendly.In this paper, the experimental study on the snow-melting on pavement based on gr ound-source H eat P ump i s m ainly carried out . T he a uthor analyzes the regularity for change of temperature of the various metrical points in the structure layer of road along with the heating time, researches the distribution of temperature of t he r oad s tructure l ayer and the property of variable melting r ate, b esides, explores the e valuate methods of t he s now-melting. Then, analyzes how the arrangement of the h eating pipes such as the pipe spacing and depth effects the snow-melting process and situation, and discuss the calculation method of the depth of buried pipe.Based on environmental study, this paper figures out snow-melting load of the freeway in winter, beginning with the study of the climate of four areas-Harbin, Shenyang, Beijing, Wuhan, analyzes the feasibility of the snow-melting technology according to the climate characteristic of every city, and chooses a commonly used snow-melting technology, and carries on comparative analysis with one based on ground source Heat Pump system. Economic evaluation of each project is carried out with annual cost approach through the initial cost and operating expenses of every p roject which is o btained. The c onclusion w hich s now-melting ba sed on ground s ource he at pum ps i s m ore e conomical w ay c ompared w ith th e snow-melting b y el ectrical heating wire, a nd t he be nefit i s r emarkable i f the snow-melting based on ground source heat pumps is used in hot summer and cold winter zone.The topic is from the key project of the"Eleventh Five-Year Plan"National Science a nd T echnology S upport P roject-"Key Technology R esearch Comprehensive Transportation System Promotion and Facilities Construction in the City"(No.2006BAJ18B05-04). |
