The insulation of external wall can reduce building energy consumption in energy saving building, but the insulation thickness is affected by construction fund and heat preservation performance. Economical optimum mathematics model of insulation thickness is established on external wall by using life cycle cost for the whole expenses of cncrgy consumption and insulation construction minimum. Many influence factors of the optimum insulation thickness are analyzed. The optimum insulation thickness of six skeleton wall are gotten in Design Standard of Residential Building for Energy Efficiency in...
