Thames & Kosmos Green Engineering: Clean Energy & Sustainable Living handleiding

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for Living

Houses consume energy, but how much energy and where that energy

comes from varies widely from house to house. As you will discover later

through your own experiments, houses with poor insulation need a lot of

energy to keep warm in cold weather and cool in hot weather. Drafty

windows and doors, large open spaces with high ceilings, and outdated

and inecient appliances can also all lead to more energy usage.

These days, most new buildings have to comply to energy standards

set by national and local governments. In the US, there are many

dierent types of assessments that a house can undergo to determine its energy

eciency. Some other countries have national standard tests, similar to building code

inspections.

The most energy ecient houses are known as passive houses and zero-energy houses.

In a passive house, no heating energy is required at all, because the heat required is

generated by sunlight, good insulation of the walls and windows, the body heat of the

residents, and by recovering the waste heat from appliances (washing machine,

refrigerator, etc.).

A zero-energy house, on the other hand, has its own active energy generators, such as

solar panels. It therefore does not require any other energy supply, like oil, gas, or

electricity from outside sources, but is also signiﬁcantly more expensive to build and

maintain than a passive house. However, it usually “earns back” these additional costs

over the course of a few years through savings on electricity and heating materials.

Sometimes, electric companies will even pay for excess generated electricity to be

fed into the local grid.

Energy

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