wastewater and waste disposal in the building sector also need energy for running (Reinhard, M. and Yasin, 2011). Using China as an example, approximately 25% of total energy is consumed in urban buildings (National Bureau of Statistics of China, 2010; Qiu et al., 2007). This energy use is associated with over 5 billion
tonnes of CO2 equivalent (CO2e) emissions in 2010. With 11% of
annual growth of energy consumption in buildings in recent years,
it is predicated to continue in next decades with the rapid urban
development (Qiu et al., 2007).