建筑节能是指建筑物在使用和建造过程中,合理地使用和有效地利用能源,以便在满足同等需要或达到相同目的的条件下,尽可能降低能耗。各国建筑能耗往往是以使用过程中的能耗,特别是以其中的采暖(和热水供应)及空调能耗为主。因此,国际上建筑节能的重点都是放在节约采暖和降低能耗上,并且把建筑节能工作与提高建筑热舒适性、降低采暖和空调费用 Building energy efficiency refers to the rational use and effective use of energy during the use and construction of buildings to reduce energy consumption as much as possible while meeting the same needs or achieving the same objectives. The energy consumption of buildings in various countries is often based on the energy consumption during use, especially the heating (and hot water supply) and air-conditioning energy consumption. Therefore, the focus of international building energy conservation is on saving heating and reducing energy consumption, and on building energy efficiency and improving building thermal comfort, reducing heating and air conditioning costs.