某办公建筑围护结构和空调系统改造分析

Analysis on Retrofit of Building Envelope and Air Conditioning System for an Existing Office Building

加强适用于不同气候区、不同建筑类型的节能低碳技术研发和推广,推动超低能耗建筑发展是实现碳达峰的重要措施。综合运用外墙和屋顶外保温、3层玻璃塑框窗、窗外遮阳、新风热回收以及其他节能技术对一幢夏热冬冷地区的办公建筑进行了建筑围护结构和空调系统改造。改造前,通过PKPM模拟软件对所用的节能技术进行空调负荷分析和能耗模拟。模拟结果显示,改造前主要负荷为围护结构和新风负荷,改造后室内发热量成为主要负荷;改造后的空调模拟能耗下降约80%。实际空调运行能耗统计表明,全年能耗相对改造前下降76.7%,其中采暖能耗下降达89%。另外,新风多级过滤改善了室内空气质量,室内PM_(2.5)浓度相对于室外下降99.4%,而全新风设计和消杀措施有效防止疫情期间交叉感染发生。

Stepping up the R&D and application of energy-saving and low-carbon technologies that can be used in various climatic regions and for different buildings,in order to develop ultra-low-energy consumption buildings,which is the important measure to achieve carbon peak.The building envelope and air conditioning system for an existing office building in hot summer and cold winter are retrofitted.The used energy-saving technologies include external wall and roof heat insulation,triple pane with plastic frame window,external window shading,ventilation with heat recovery and other energy-saving technologies.Air conditioning load and energy consumption were carried out by PKPM simulation software.The simulation results show that the main air conditioning load was from the envelope and ventilation before retrofit.But after retrofit,the main load was from the indoor heating load and the air conditioning energy consumption was decreased by 80%.The actual air conditioning operation energy consumption was decreased by 76.7%,especially heating energy consumption was decreased by 89%in winter.Meanwhile,fresh air multistage filtration improved indoor air quality,PM_(2.5) concentration was decreased by 99.4%than outdoor.Full fresh air design and killing measures effectively prevent cross infection during the epidemic.