Research On Thermal Characteristic Of Workshops During Heating System Failure In Cold Areas

Industrial plants heating system failure may be caused by accidents such as earthquake, typhoons, fires, equipment accidents, atmospheric over voltage and illegal operations. In order to comprehensively analyze the risk of industrial plants during heating system failure and provide proposal for antifreezing design and operation managements in winter, the industrial plant temperature field was simulated to assess whether the industrial plant meets the antifreezing requirements in winter. Moreover, according to the simulation results, rational and effective freezing measures should be proposed for those pants that does not meet the antifreeze requirements.Based on the antifreezing simulation of 35 industrial plants in Dalian, through a comprehensive analysis of the industrial plant thermal characteristics and the factors which impact the cooling process, De ST was selected as the tool for antifreezing simulation. This paper studied the antifreezing standardization of data label, envelope data collection, internal disturbance based on the industrial plant antifreezing simulation standardization process and proposed a set of scientific and effective data collection and statistical methods. Some simplified methods were proposed for several intricate problems.For large space plant cooling thermal process, based on regional models, a method coupled De ST and Fluent to simulate the large space industrial plants was proposed. The validity of this method was tested through the comparation between measured data and simulated data.In order to put forword reasonable and effective antifreezing measures, factors that affect the plant cooling process were analyzed. The impacts and trends for the plant cooling process influenced by solar radiation, long-wave radiation at night, the initial temperature, internal source heat, cold air infiltration, window to wall ratio, building envelope insulation performance and regenerative properties were studied. According to the results, for the plant antifreezing, the most effective way were envelope insulation performance and the initial temperature of the plant, follow by the window to wall ratio and the amount of cold air infiltration.In order to calculate reasonable and effective freezing measures more quickly and easily. A method to estimate the results for plant cooling process and antifreezing measures was presented.This estimation method met the advantages of accuracy, safety and effectiveness through validation through application this method in real plants.