An Application Study On Building Wall Insulation Structure In Zhejiang

According to the building thermal design climate zone,Zhejiang falls in the hot-summer-and-cold-winter zone,which is noted for its harsher climate condition,hot and humid in summer but cold and damp in winter.With the rapid development of urbanization and the improvement of living standards,people put forward higher requirements for indoor thermal comfort of buildings and building energy consumption also increases.Thebuilding energy consumption is directly related to the thermal insulation performance of building envelope,especially the wall.According to investigation,the present approaches to wall-insulation structure in Zhejiang province consist of four types: external insulation,internal insulation,self-insulation and composite insulation.Various thermal insulation structures have different thermal properties;different ways of using energy should also be matched with appropriate thermal insulation structure to achieve better thermal insulation effect.In the central-heating areas for 24 hours uninterrupted heating in northern China,better energy saving effect has been achieved by using external insulation wall.However,under the condition of intermittent and compartment heating and cooling,the energy saving effect of the external insulation structure widely used in Zhejiang province is not ideal.By sampling Hangzhou and Zhoushan,two typical cities in Zhejiang,through the methods of literature collection,investigation and statistics,calculation and deduction of wall energy consumption,the feasibility of internal thermal insulation structure in building thermal insulation wall in Zhejiang province is analyzed theoretically;and the applicability of the internal thermal insulation structure in Zhejiang was proved from many aspects through the test of a small physical room.The conclusion is asfollows:1.Through looking up the yearbook data and energy saving record and registration of new buildings,we know the structure form of the wall in this area.Most of the traditional residential buildings in the existing buildings do not adopt wall insulation measures,and the wall external insulation accounts for the largest proportion in the new buildings.2.According to the survey,residents in this area have more subjective control of air conditioning,and different users have different habits,and they are intermittent and divided into different rooms.Through the calculation of wall energy consumption under two cooling modes in summer,the adoption of internal insulation structure is more beneficial to building energy saving and indoor comfort improvement.The mode of usingair conditioning which is opened only after immediate use can feel the change of indoor temperature faster,and because the change time is fast,it is not enough to directly affect the thermal comfort degree of human body in theprocess.3.Through the analysis on the advantages and disadvantages of the Zhejiang commonly used thermal insulation material,selection of inside and outside of polystyrene insulation construction test room,two small entity according to the observation records and data analysis,test results from the condensate on the inner surface,the room heat stability,heat preservation and heat insulation effect,air conditioning energy consumption and thermal bridge effect has been clear about the insulation structure in Zhejiang area than the external thermal insulation structure was more suitable.