求翻译：对我国华北地区既有建筑供暖系统的节能改造技术方法进行了详细的分析和介绍；对既有采暖居住建筑节能改造后的全年能耗、节能改造收益、成本和初投资回收进行了评价；对华北地区当前供暖方式的不合理以及节能改造技术方法结合工程实例进行分析，提出了华北既有建筑供暖系统围护结构节能的改造措施。是什么意思？

Of existing buildings in North China's energy-saving heating system for a detailed technical analysis methods and introduction; of existing energy-saving heating residential buildings after the annual energy consumption, energy-saving benefits, cost and investment recovery was evaluated in early ; o

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Already had the construction heating system energy conservation transformation technology method to our country North China area to carry on the detailed analysis and the introduction; After already had the heating housing construction energy conservation transformation whole year energy consumption

On in China in North China both building heating system of energy-saving reconstruction technology method for has more of analysis and describes; on both heating live building energy-saving reconstruction Hou of annual energy consumption, and energy-saving reconstruction proceeds, and cost and early

The technological method of reducing energy consumption which had the heating system of the building on North China of our country has carried on detailed analysis and introduction; To having heating that inhabited the energy consumption of the whole year after the reducing energy consumption of the