3-11 Sustainable energy 3.4 (p 141)

• Natuurkunde
• Middelbare school
• havo, vwo
• Leerjaar 2

Sustainable energy (3.4)

How can you save energy at home?

Saving with insulation

Heat escapes from a house

Heating stays on for a long time

Isolation prevents this:

• Roof
• Walls
• Double glazing

Example of calculation p 141

Electricity from solar heat

In Seville, Spain - solar power generator 

• Mirrors reflect sunlight 
  

        to a tower

• Here a big tank with water is heated

        (steam has a temperature of 250 ⁰C)

• This turns steam turbines.

If you replace single glazing with double glazing, you save 700MJ per square meter. How much do you save if you replace a 4x5 meter window?

1. 14 000 MJ
2. 14 000 kJ
3. 35 MJ
4. 35 KJ

If you save 14 000 MJ , how much natural gas do you save?

1. 448 square meter
2. 437 square meter
3. 448 000 square meter
4. 438 square meter

What does not help when insulating a house?

1. Double glazing
2. Wall insulation
3. Floor heating
4. Roof insulation

The solar power generator in Seville, Spain looks like a...

1. Solar collector
2. Solar pannel
3. Turbine of an electric power station

Questions (p 142)

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