Heat loss in buildings



Heat is a form of energy which flows from a hotter to a colder source. The level of comfort inside a building depends upon the season, time of day and whether the room is being heated or cooled; it also depends upon the level of activity such as working during the day or sleeping at night. In the home, the largest amount of energy is used for space heating and it is important to understand the ways in which heat can flow and be lost from buildings in order to reduce our energy consumption and use energy more efficiently.

Heat transfer processes


The process is of course reversible; in summer the heat flow is inward because it is warmer outside than inside whilst during the winter the flow is outward when it is warmer inside than outside. The objective of good passive architecture is to reduce both sets of heat flow arising from radiation.

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