This document summarizes the building of a sun oven in Portugal using various materials to maximize solar energy absorption and heat retention. Key materials used include mirrors to direct sunlight, glass to allow light in while retaining heat, black sponges and ink to absorb heat, and MDF boards as insulators. Examples of foods cooked include bread, pizza, and mini-pizzas, showcasing the oven's ability to harness Portugal's strong solar radiation for cooking purposes.

1. 2015
Building of a sun oven

2. Portugal
and the
Sun
• Solar energy is energy radiated by the
sun which reaches the Earth's surface in
the form of heat (infra-red radiation)
or sunshine rays (ultraviolet and
visible light).
• Portugal is one of Europe's countries
with the greatest availability of solar
radiation.
• The annual average number of hours of
sunshine that we have in our country,
are 2200-3000 hours average.

3. Portugal
and the
Sun
http://alumni.ipt.pt/~roberta/projecto.html

4. Geographic Coordinates
• 41º 13’ 22 437’’ N
• 8º 24’ 40 407’’ W

5. Materials Used
• Mirrors
• Glass
• Black Sponges
• MDF Boards
• White Glue
• Dull Black Ink
• Screws

6. Why those
materials
?
• We shall use those materials in order to
increase the income of the solar oven.
• The mirrors have a great importance in the
success of cooking food. We have to place
them with the perfect inclination to
utilize the solar power as much as
possible.
• The glass is the most important material of
all, it allows the visible light radiation
to penetrate through it, and disable the
infra-red radiation to slip away, creating
a greenhouse system inside, allowing the
temperature to highly increase.
• White glue and screws are used to stick the
boards

7. Why those
materials
?
• Why to use black sponges? Black sponges are
a good thermal isolator, which will
maintain the temperature inside for a
longer time, then if they are black, that
would be perfect due the fact that black is
the best absorber of heat.
• We must use MDF boards, they are resistant,
and just like sponges, they are also a good
thermal isolator.
• One of the most needed materials is the
dull black ink, why? They are the greatest
absorber of heat, and if it is a dull, even
better because it will only allow a little
bit of visible light radiation to be
reflected.

8. Cooking Bread with
Spicy Sausage

9. Cooking Pizza

10. Cooking Mini-Pizzas

11. Gonçalo Moreira's Sun Oven