The walls of a furnace are made of 1.2-ft-thick concrete (k = 0.64 Btu/h·ft·°F and a = 0.023 ft2/h). Initially, the furnace and the surrounding air are in thermal equilibrium at 70°F. The furnace is then fired, and the inner surfaces of the furnace are subjected to hot gases at 1800°F with a very large heat transfer coefficient. Determine how long it will take for the temperature of the outer surface of the furnace walls to rise to 70.1°F.
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
The walls of a furnace are made of 1.2-ft-thick concrete
(k = 0.64 Btu/h·ft·°F and a = 0.023 ft2/h). Initially, the
furnace and the surrounding air are in thermal equilibrium at
70°F. The furnace is then fired, and the inner surfaces of the
furnace are subjected to hot gases at 1800°F with a very large
the temperature of the outer surface of the furnace walls to rise
to 70.1°F.
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