18 May 2017
Global energy demand from buildings is projected to grow by an additional 838 Mtoe till 2035 compared to 2010 (IEA, 2012a). Reducing energy consumption in the building sector is one of the most important measures for global energy reduction and climate adaptation. Nearly/net zero energy building is one promising path leading to further building energy conservation for the future direction of building development. Proactive measures, with renewable energy sources, are recognized to help to realize energy saving.
Nearly zero energy building has met its big time in China, more than 30 demo buildings either public or residential has finished or is under construction countryside. The first standard related to nearly zero energy building “Passive Low-Energy Green Building Technical Guideline (Residential)” has launched in 2015 by MOHURD. Many cities such as Beijing and Qingdao has published active policies to promote the development of nearly zero energy buildings.
Heating, cooling and ventilation has account roughly 50% of building energy consumption, which matters more in low energy building. Regarding the heat pump, as one of the most popular energy systems particularly in nearly zero energy building, it is important to consider and emphasize the procedure to perform more efficiently, make more contribution and increase the compatibility with other energy in nearly zero energy building.
The CABR NZEB demonstration project, located in Beijing, China, set up ambitious annual energy consumption cap of 25 kWh/(m2.a) (including heating, cooling and lighting energy). It integrated cutting-edge building technologies and strived to lay the foundation for China’s NZEB standard. Ground source heat pump combined with solar thermal serves as the primary energy system of the building. Under specific and delicacy control management, preliminary energy consumption data shows that CABR NZEB is meeting its energy consumption target. Integrated utilization of heat pump system with the ground source and solar energy system demonstrated success for NZEBs in the cold climate region.