I'm trying to calculate how much water do I need to evaporate to cool down the skin of a combustion chamber of a rocket engine after a test. You can approximate its shape with a cylinder with a 50 cm diameter and a wall 2mm thick. Overall the combustion chamber is 60cm long.
You can use the heat capacity of s235 steel. 
At the end of a 1 minute test the engine is at 1000K. explain your steps
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