Steam at Ti = 380°C flows in a cast iron pipe (k = 75 W/m.°C) whose inner and outer diameters are Di = 6 cm and D2= 7.5 cm, respectively. The pipe is covered with 4 cm thick glass wool insulation with k = 0.05 W/m. °C. Heat is lost to the surroundings at T2= 8°C by natural convection and radiation, with a combined heat transfer coefficient of h) = 20 W/m? .°C. Taking the heat transfer coefficient inside the pipe to be hi = 70 W/m?.°C, determine the rate of heat loss from the steam per unit length of the pipe. Also determine the temperature drops across the pipe shell and the insulation.
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.
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