Franz, can you tell us something about this 
eco-friendly fridge? 
I'd love to. 
First, I want to welcome you to 
Quinta Das Pedras Alvas. 
Which is our place here in Central Portugal.
The summer can be very hot here. 
Like many places in Portugal. 
So a fridge is definitely something you want to have. 
You can follow me into our rabbit hole. 
Basically, it's just a big hole. 
Which is covered with a palatte and soil on top. 
To insulate it towards the roof. 
From the ground we get some humidity. 
The evaporation cools down the space in here. 
Should some hot here gather 
in this compartment...
We pump it out by a solar fan,
which is in the corner. 
To have even lower temperature...
Here in the bottom, we integrated a plastic box. 
On a day like this, with more than
30 degrees celcius outside...
We have less than 20 inside. 
To keep the low temperature, 
which we can gain especially at night....
Behind this wall is a 10,000 liter water tank. 
So this makes it a slow reacting system. 
It avoids that the temperatures 
jump up to much during the day. 
Therefore we have a slighty moist, 
relatively cool environment. 
Which is very nice for storing cucumbers, zucchinies...
...pumpkins, carrots, apples, tomatoes.
As you can see, everything stays nice and fresh! 
