Building in Use - Environmental aspects
CO2-balance of the building
The table below shows the environmental impact of 1 kWh of heating energy (depending on the fuel/energy used) (go to GBC - the green building challenge handbook):
|Unit||kg CO2 equ./kWh||kg SO2 equ./kWh||kWh/kWh|
The above data when used with heating energy consumption values will allow a simple
calculation of the CO2 balance of a building over a one year period. For
example, if the heating energy consumption is 50 kWh/m²a and the house has an area of 150
m² and a natural gas heating system, the total CO2 output (GWP) is 0.263 x 50
x 150 = 1.972,5 kg CO2 equivalent.
Compared to the CO2 produced by a buildings heating system, the CO2 emissions caused by the production process of bricks and clay blocks are very low. The GBC-study of the clay brick industry in Germany, Austria and Switzerland (see GBC - the green building challenge handbook > Building materials) shows a GWP value of 0.194 kg CO2 equivalent per kilogram of clay bricks. A 150 m² family house will involve on average the use of 40 tons of clay bricks or blocks that will generate 7.760 kg of CO2 during their manufacture. In other words, the CO2 output resulting from four years of heating exceeds the CO2 caused by the manufacture of the bricks.
Normally, mass brickwork has an average life of at least 90 years. If the CO2
output caused by the brick manufacture is divided over 90 years, the average annual CO2
load is only 86 kg CO2, or 4,4% of the CO2 produced by the heating
© TBE-Europe 2005