RESEARCH ON THE ENERGY-SAVING DESIGN SCHEMES OF LIGHT GAUGE STEEL-FRAMED COMPOSITE WALLS OF RESIDENTIAL CONSTRUCTION

Two thermal behavior experiments of light gauge steel-framed composite walls with slotted studs and withexternal thermal insulation layers were carried in the lab of combined energy consumption test board for components of building envelope in school of municipal and environmental engineering at HIT. The method of thermocouple temperature measurement was used. The heat transfer coefficients and temperature of the measure points of composite wall were deeply investigated. Two conclusions were drawn from the test. According the test，the web slotted studs can reduce heat loss of the light gauge steel-framed composite walls，thus weakening the thermal bridge effect of the location in stud part，then significantly improve the thermal insulation properties of the composite walls; the composite wall heat transfer coefficients of the two test schemes are 0.315 W/ (m2K) and 0.250 W/ (m2K)，which can meet the residential building envelope heat transfer coefficient limit value of cold areas well. Using the standard studs which recommended by Light Gauge Steel Framing Assembly Housing Specification(JG /T 1822005)，standard steel-framed walls were made up and selected as the research object. ANSYS finite element model is used to analyse the wall heat transfer properties. To obtain the goal as the light gauge steel-framed composite wall to meet the Harbin area construction outer wall energy conservation standard，the comprehensive inspection and contrast were analyzed of mean heat conductivity of four kinds of walls，the walls economic comparison was carried on，too. The design scheme of the light gauge steel-framed composite walls was proposed to meet the construction energy conservation standard in cold areas in China.