文中还对热缠绕直埋保温管与地沟敷设保温管做了技术经济分析。
In the paper, a technological economic analysis is made as well to compare the twisting thermal insulated direct-buried pipes with underground tunnel laying ones.
建立了供热管网直埋、地沟敷设管道的二维数学模型，通过边界离散方法进行了求解。
Develops the two dimensional mathematical models for direct-buried pipes and in-duct pipes and solves them using the boundary discretization method.
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