夏热冬暖地区办公建筑围护结构改造节能经济性分析

Energy and Economy Analysis of Building Envelope Retrofitting in the Hot Summer and Warm Winter Zone of China

对夏热冬暖地区某办公建筑进行能耗测试,利用能耗模拟软件TRNSYS对该建筑空调能耗进行模拟,分析空调冷负荷对于各围护结构的敏感性,对影响能耗显著的外墙、遮阳系数及建筑渗透率进行改造。利用NPV动态经济评价体系,在建筑运行时间内对26种改造方案进行节能经济性分析。结果表明,外墙中度强化、建筑渗透率高度强化及遮阳系数高度强化方案的经济收益值最大,改造成本回收年限较短,为经济性最优改造方案。

This study selected an office building to test the demand of building cooling load in the hot summer and warmwinter zone of China. Based on the hourly cooling load simulated by TRNSYS, sensitivity analysis was conducted on thebuilding envelopes, and the exterior wall, shading coefficient and infiltration rate were retrofitted for assessing theirthermal responses. Moreover, 26 retrofitting schemes were compared by energy and economic NPV evaluation. The resultsindicate that the optimal scenario is the scheme of the exterior wall slightly-retrofitted, infiltration rate highly-retrofittedand shading coefficient highly-retrofitted, which owns the maximum profit and an economical payback period.