Wednesday 18 August 2010

Earth Ovens 2

Heat


There are three types of Heat-

  1. Convection
  2. Conduction
  3. Radiation
How does this work in an Earth Oven? (I hear you cry) You stick a heat source, like a blazing fire, in your oven. The heat from the fire is absorbed by the (well-insulated) walls, and into the refractory brick floor. Some of this heat is conducted through the direct contact made by the Pizza/Bread/Food with the refractory brick floor. Some heat absorbed by the walls and is radiated back from them. And some of the heat swirls around, or is convected. inside the oven in the air and steam. End result; crispy pizzas and crusty bread. The oven will remain warm for around 6 hours without rekindling. At the start of the cooking cycle , after the oven has been fired for about two hours, the temperature can reach 700 degrees, or so I'm reliably informed, I place my fist at the oven door to guesstimate. This will cook a pizza in minutes. After pizzas, the oven has cooled for Sourdough  bread, then cakes and biscuits, roast meat/veg, fish, fruit, etc., maybe end with yoghurt.

The activities can last all day, if you want. It encourages sociability; why make pizza just for yourselves? Why waste the heat? Invite neighbours to bring their favourite toppings for a pizza brunch. Bake bread with friends, and everyone goes home with a loaf. Roasted peppers, anyone? Once a month for the full moon come together, make some heat, bake and celebrate!

Your indoor oven is not so much fun, and it doesn't cook food in the same way in its use of heat as the Earth Oven (see above and look at your indoor oven), therefore it does not taste as good.

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