Advances in Materials Science and Engineering

Research Article

[Retracted] Case Study of Carbon Emissions from a Building’s Life Cycle Based on BIM and Ecotect

The sensitivity analysis of annual CO₂ emissions by altering design configurations.


Design ID	Changed to original design	Annual CO₂ emission (t)	Compared with D0	Decreased

D0	Existing design	1463.92	—	—

D1	Changing thermal transmittance coefficient, W/(m²·K)	—	—	—
	(1) Exterior walls changed from 1.081 to 0.713	1361.45	0.93	0.07
	(2) Roof changed from 0.812 to 0.5	1452.21	0.992	0.008
	(3) Exterior windows changed from 5.700 to 2.100	1346.81	0.92	0.08

D2	Reducing the fresh air volume from 30 to 20 (unit, m³/(h·p))	1258.97	0.86	0.14

D3	Using nighttime ventilation	—	—	—
	(1) Duration: June 1–September 30 Frequency of ventilation and air exchange: 2 times/h from 21:00 to 09:00 (the next morning); 0.5 times/h at all other times	1456.6	0.995	0.005
	(2) Duration: June 1–September 30 Frequency of ventilation and air exchange: 4 times/h from 21:00 to 09:00 (the next morning); 0.5 times/h at all other times	1452.21	0.992	0.008

D4	Extending the indoor temperature range from 18°C–26°C to 17°C–27°C	1317.53	0.90	0.10