As rapid growth in the construction industry continues to occur in China, the increased demand for a higher
standard living is driving significant growth in energy use and demand across the country. Building codes
and standards have been implemented to head off this trend, tightening prescriptive requirements for
fenestration component measures using methods similar to the US model energy code American Society of
Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) 90.1. The objective of this study is to
(a) provide an overview of applicable code requirements and current efforts within China to enable
characterization and comparison of window and shading products, and (b) quantify the load reduction and
energy savings potential of several key advanced window and shading systems, given the divergent views
on how space conditioning requirements will be met in the future.
System-level heating and cooling loads and energy use performance were evaluated for a code-compliant
large office building using the EnergyPlus building energy simulation program. Commercially-available,
highly-insulating, low-emittance windows were found to produce 24-66% lower perimeter zone HVAC
electricity use compared to the mandated energy-efficiency standard in force (GB 50189-2005) in cold
climates like Beijing. Low-e windows with operable exterior shading produced up to 30-80% reductions in
perimeter zone HVAC electricity use in Beijing and 18-38% reductions in Shanghai compared to the
standard. The economic context of China is unique since the cost of labor and materials for the building
industry is so low. Broad deployment of these commercially available technologies with the proper
supporting infrastructure for design, specification, and verification in the field would enable significant
reductions in energy use and greenhouse gas emissions in the near term.