为明确基于太阳能利用的公路隧道消防管道内设加热保温方案的关键参数，依托府村川隧道工程，建立“管中管”数值计算模型，通过数值与理论计算，确定经济合理的保温层厚度和进口温度，并通过拟合计算，提出能综合反映闭合环路管加热的传热量放大系数。研究结果表明: 1）外敷保温层的防冻效果存在上限，保温层厚度取值宜为50 mm左右，加热管进口温度应保持在40 ℃以上，能有效阻止消防系统冻结； 2）第2传热过程数值计算结果与理论计算结果吻合较好，证明了数值计算结果的可靠性； 3）结合数值计算结果，提出考虑第1传热过程双管闭合环路加热的传热量计算公式，并通过府村川隧道工程验证了公式的可行性，提出当消防管道温度小于36.4 ℃时，消防管道不会发生冻结危险。
To clarify the key parameters of a heating insulation
system for a highway tunnel fire pipeline that utilizes solar energy, a
numerical calculation model of a "pipe in a pipe" system is
established based on the Fucunchuan tunnel project. This model determines the
insulation layer thickness and inlet temperature that are both economically and
practically reasonable. Furthermore, a heat transfer amplification factor that
comprehensively reflects the heating of the closedloop
pipe is proposed through fitting calculations. The results reveal the
following: (1) There is an upper limit to the effectiveness of the external
insulation layer, and a reasonable thickness of about 50 mm should be
maintained. Additionally, the inlet temperature of the heating pipe should be
kept above 40 ℃ to effectively guarantee the antifreeze
effect of the fire pipeline system. (2) The numerical calculation results of
the second heat transfer process are in good agreement with the theoretical
results, which validates the reliability of the numerical results. (3) Based on
numerical results and considering the first heat transfer process, a heat
transfer calculation formula of doubletube closedloop heating is proposed. The feasibility of this formula is
validated through the Fucunchuan tunnel project, and it is suggested that when
the water temperature of the fire pipeline is below 36.4 ℃, the fire pipeline will not freeze.
