Abstract: Cooling and heating energy consumption of office building during 1971-2010 was simulated by using energy consumption simulation software (TRNSYS). By combining climate projection data under two emission scenarios (low emission: B1; medium emission: A1B), the impact of climate change on office building energy consumption during 2011-2100 was assessed. The results show that heating load of office building significantly decrease in the next 90 years but increase of cooling load is found. The increase rate of cooling load is higher than the decrease rate of heating load, resulting in the weak increase of total energy consumption. Under the B1 scenario, the rates of decrease in heating load and increase in cooling are less apparent compared with the A1B scenario. The change rate of total energy consumption is not apparently different between the two scenarios. Compared with 1971-2010, the average multiannual energy loads of office building in 2011-2050 are about 10% less for heating, about 12% more for cooling and over 2% more for total energy consumption under the B1 and A1B scenarios. The decrease of heating load and increase of cooling load are more apparent in 2051-2100. Particularly, the cooling load and total energy consumption will increase by about 30% and 8%, respectively. Large difference in the change rate between the two scenarios in 2051-2100 is found in the cooling load.

Key words: building energy consumption, climate change, office building, cooling, heating, projection