ABSTRACT

This paper analyses the current definition of positive energy building (PEB) and a selection of both NZEB and PEB built projects with real monitored data, discussing their design features and potential for achieving positive energy balance. The research aims to assess an optimal ratio between photovoltaic (PV) area and achieved self-sufficiency ratios in office buildings. The study shows that most of the buildings’ PV systems have an area equal to 10–20% of the total building’s net floor area. Buildings that have PV to area ratio from 13% to 20% are self-sufficient from 100% to 150%. PV installation in the façades results decisive for reaching positive energy balance. The relation of the PV system installed on the façade to PV system on the roof is from 50% to 57% for the studied buildings. Buildings located in sites with higher global horizontal irradiation (GHI) tend to have lower PV area ratios.

摘要

本文分析了正能量建筑 (PEB) 的当前定义，并选择了具有真实监测数据的 NZEB 和 PEB 建筑项目，讨论了它们的设计特点和实现正能量平衡的潜力。该研究旨在评估光伏 (PV) 面积与办公楼实现的自给率之间的最佳比例。研究表明，大多数建筑物的光伏系统的面积等于建筑物总净建筑面积的 10-20%。光伏面积比为 13% 至 20% 的建筑物自给自足率为 100% 至 150%。立面上的光伏安装对于实现正能量平衡具有决定性作用。对于所研究的建筑物，安装在立面上的光伏系统与屋顶上的光伏系统的关系为 50% 至 57%。