Abstract
A nearly zero energy office building was established in north China as a demonstration project to explore the nearly zero energy building’s technical system in China. Not only the building itself, but also the energy system was designed with careful consideration to satisfy its high positioning and experimental verification attributes. Energy system in this building is completely finished and extremely challenging. Two kinds of renewable energy system worked together to serve the building, as operation modes varied accordingly to outside weather conditions. Depending on different system combinations, 4 strategies were found, and in this article, 4 of them are discussed. Energy consumption and system performance were compared and analysed to find an optimized operation.
Highlights
A 4-floor office building is constructed as a Nearly Zero Energy demo building in north China, addressing fundamental issues about the building’s energy efficiency
The building itself, and the energy system was designed with careful consideration to satisfy its high positioning and experimental verification attributes
The envelope of the building has much better thermal insulation to reduce the cooling and heating demand compared to the current building standard in China. 25 mm of vacuum insulation board with thermal conductivity of 0.004 W/(m2∙K) was used for external wall
Summary
A 4-floor office building is constructed as a Nearly Zero Energy demo building in north China, addressing fundamental issues about the building’s energy efficiency. Due to the above consideration, the combined solarthermal and ground source heat pump system was determined as the final choice of the energy system. The absorption chiller, driven by hot water from solar collection systems, processes the ventilation load of the 1st and 4th floor in summer, is supplemented by a 50kW GSHP unit (GSHP 1#). Absorption chiller out of work and GSHP 1# provides ventilation load of the 1st and 4th floor. Cooperating with ground source heat pump, solar collection systems provide direct heating in winter with thermal storage. Though each equipment and system has certain terminal connection from the original design, due to the low building cooling and heating load, energy system and equipment have the possibility to connect with different floor terminal. Operation data of year 2018 in different mode was discussed into great extent
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