Study On Performance And Quality Evaluation Of External Thermal Insulation System

Building energy efficiency is an important part of the country's energy saving and emission reduction project. External wall thermal insulating technology can improve the thermal insulation properties of building envelope, and reduce building energy consumption. But in the current market there are many kinds of external wall thermal insulating technologies by using varieties of method statements and heat insulating materials which are made by different manufactures, so the property and quality of each thermal insulating technology are irregularity and have different effects. Therefore, the detailed study and evaluation on the property and overall quality of external thermal insulation system (ETIS) have certain theoretical meaning and project application value. In this thesis the research content and main achievements are as follows:Firstly, Ansys software and Energyplus energy simulation software were used to analyze the performances of thermal insulation of three kinds of prevailing ETIS, which are polystyrene granule mortar, expanded polystyrene (EPS) board, and polyurethane foam ETIS. Under different ambient temperature conditions in summer and winter, after analyzing the heat transfer effect of three kinds of ETIS by using Ansys software, the result indicates that they all have good heat preservation and heat insulation capabilities, and in turn improves, the best is polyurethane foam ETIS. With Energyplus energy consumption simulation software analyzed and the result shows that the energy consumption in turn reduces. The results of two methods are consistent; moreover, the results show that thickness of thermal insulation material is the key control factor for thermal insulation performance of ETIS.Secondly, with reference to specification of testing conditions of atmospheric exposure tests, studied the change laws of adhesive strength of three kinds of ETIS with time. With the conditions of high temperature-spraying water cycle simulating summer environment, the downtrend of adhesive strength of three kinds of ETIS were all smooth and steady. While under the conditions of heating-refrigeration cycle simulating winter environment, the downtrend of adhesive strength of EPS board ETIS decreased obviously, and this indicats that in cold areas the weatherability of EPS board ETIS is poorer than the other two ETIS, and this shows that the weatherability of EPS board of ETIS was worse than the other two ETIS in cold areas; The lowering rate of adhesive strength for the other two ETIS had a little change under heating-refrigeration cycle, and this shows that these two ETIS have better weatherability in cold areas. In addition, in this thesis also analyzed the fire safety, earthquake-resistant, constructability and economy of ETIS and finally put forward relevant suggestions for improvement.Finally, the evaluation model of quality evaluation of ETIS was established based on the theory of fault tree analysis (FTA) and the reliability appraisal standards of industry and public building, and then analyzed the relevant factors influencing the quality of ETIS and their logical relation, clarified the possible reasons which causing quality defect or fault and which parts should take control measures, and proposed the evaluation method and criteria of ETIS quality grade based on FTA. The results have a significant instruction function for evaluation of ETIS quality.