A test is conducted to determine the overall heat transfer coefficient in anautomotive radiator that is a compact cross-flow water-to-air heat exchangerwith both fluids (air and water) unmixed. The radiator has 40 tubesof internal diameter 0.5 cm and length 65 cm in a closely spaced plate-finnedmatrix. Hot water enters the tubes at 90°C at a rate of 0.6 kg/s and leaves at65°C. Air flows across the radiator through the interfin spaces and is heatedfrom 20°C to 40°C. Determine the overall heat transfer coefficient Ui of thisradiator based on the inner surface area of the tubes.
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.
A test is
automotive
with both fluids (air and water) unmixed. The radiator has 40 tubes
of internal diameter 0.5 cm and length 65 cm in a closely spaced plate-finned
matrix. Hot water enters the tubes at 90°C at a rate of 0.6 kg/s and leaves at
65°C. Air flows across the radiator through the interfin spaces and is heated
from 20°C to 40°C. Determine the overall heat transfer coefficient Ui of this
radiator based on the inner surface area of the tubes.
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