•

Energy use in buildings

Energy is used for

• Lighting

• Heating

• Cooling

• Appliances

Use of energyPrimary energy

Transformati

onSecondary energyDelivered energyUseful energy

Calorific value

Thermal comfort

Factors in thermal comfortActivit

y Clothin

gRoom temperatureAir

movementHumidity

Factors in thermal comfortActivit

y Clothin

gRoom temperatureAir

movementHumidity

Heat loss

Heat loss

Heat gains