摘要
Abstract
The limit values of heat transfer coefficients for substation building envelopes across different cli-mate zones,with one typical city selected for each zone,were investigated.When the heat transfer coeffi-cients of roofs and external windows remain unchanged,the energy-saving rates of substations in Harbin,Beijing and Kunming increase as the external wall heat transfer coefficient decreases.By contrast,the energy-saving rates of substations in Shanghai and Guangzhou increase as the external wall heat transfer coefficient increases.When the heat transfer coeffi-cients of external walls and external windows are kept constant,the energy-saving rates of substations in Har-bin,Beijing and Kunming grow with the reduction of the roof heat transfer coefficient,whereas those in Shanghai and Guangzhou increase as the roof heat transfer coefficient rises.Within the same climate zone,adjusting the heat transfer coefficient of external walls generally provides greater energy-saving poten-tial than adjusting that of roofs.Meanwhile,roofs are exposed to long-term direct solar radiation with large heat gain,making them also a key component for energy-saving renovation of substation building enve-lopes.The heat transfer coefficient limits of substation exterior walls in severe cold area B,cold area B,hot summer and cold winter area,hot summer and warm winter area,and mild area are 0.300,0.320,1.150,1.480,and 1.200 W/(m2·K).The roof heat transfer coef-ficient limits are 0.200,0.450,0.800,0.900,and 20.700 W/(m2·K).关键词
变电站建筑/围护结构/传热系数/建筑节能Key words
substation building/building enclosure/heat transfer coefficient/building energy-saving分类
建筑与水利
