How much heat will be released when 3 m3 of cast iron is cooled from 90 to 10 degrees?

To find the thermal energy released during the cooling of the cast iron, we will use the formula: Q = Сч * m * (t2 – t1) = Сч * ρh * V * (t2 – t1).

Values of constants and variables: Сч – specific heat capacity of cast iron (Сч = 540 J / (kg * K)); ρch – density of cast iron (ρh = 7000 kg / m3); V – volume (V = 3 m3); t2 – temperature before cooling (t2 = 90 ºС); t1 – final temperature (t1 = 10 ºС).

Let us perform the calculation: Q = Mt * ρh * V * (t2 – t1) = 540 * 7000 * 3 * (90 – 10) = 907.2 * 106 J (907.2 MJ).