传热子模型对火灾网络模型的求解精度与速度的影响研究

Influence Study of Heat Transfer Sub-models on the Fire Network Model's Solving Precision and Speed

分析半无限大物体的传热过程,提出线性化的传热计算方法并编制了计算子程序,将子程序嵌入传热子模型为有限厚墙体的《高层建筑火灾烟流运动特性预测软件》,利用实例分析比较了两种传热计算方法对火灾网络模型求解精度和求解速度的影响。计算结果表明对3个节点的简单建筑,半无限大传热子模型与有限厚模型的室温计算最大偏差不超过5%,而计算机耗时约减少了1/3。该研究的结论对《高层建筑火灾烟流运动特性预测软件》的进一步完善和成熟及其市场化具有重要的推动作用。

A method of linear heat transfer is put forward based on the analysis of the process of half-infinite objects heat transfer, then it is programmed and implanted into Predicting Software for High Building＂ Fire Smoke Property which is used for the sub-model of finite-thickness wall＇s heat transfer. A contrast of influence on the fire network model＇s solving precision and speed is made between the above two calculation methods of heat transfer by illustration. It shows that for three-node simple building, half-infinite heat transfer sub-model has a deviation of less than 5% with finite heat transfer sub-model, but its time spent on calculation is shortened 1/3 of that needed by finite heat transfer sub-model. This research result has an important effect on the further maturation and marketization of Predicting Software for High Building＂ Fire Smoke Property.