Steam in a heating system flows through tubes whose outer diameter is 3 cm and whose walls are maintained at a temperature of 120°C. Circular aluminum alloy fins (k = 180 W/m·K) of outer diameter 6 cm and constant thickness t = 2 mm are attached to the tube. The space between the fins is 3 mm, and thus there are 200 fins per meter length of the tube. Heat is transferred to the surrounding air at 25°C, with a combined heat transfer coefficient of 60 W/m2·K. Determine the increase in heat transfer from the tube per meter of its length as a result of adding fins.
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.
Steam in a heating system flows through tubes
whose outer diameter is 3 cm and whose walls are maintained
at a temperature of 120°C. Circular aluminum alloy fins (k =
180 W/m·K) of outer diameter 6 cm and constant thickness t =
2 mm are attached to the tube. The
space between the fins is 3 mm, and thus there are 200 fins per
meter length of the tube. Heat is transferred to the surrounding
air at 25°C, with a combined heat transfer coefficient of
60 W/m2·K. Determine the increase in heat transfer from the
tube per meter of its length as a result of adding fins.
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