A double-pipe parallel-flow heat exchanger is used to heat cold tap water with hot water. Hot water (cp = 4.25 kJ/kg·K) enters the tube at 85°C at a rate of 1.4 kg/s and leaves at 50°C. The heat exchanger is not well insulated, and it is estimated that 3 percent of the heat given up by the hot fluid is lost from the heat exchanger. If the overall heat transfer coefficient and the surface area of the heat exchanger are 1150 W/m2·K and 4 m2, respectively, determine the rate of heat transfer to the cold water and the log mean temperature difference for this heat exchanger.
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 double-pipe parallel-flow heat exchanger is used to
heat cold tap water with hot water. Hot water (cp = 4.25 kJ/kg·K)
enters the tube at 85°C at a rate of 1.4 kg/s and leaves at 50°C.
The heat exchanger is not well insulated, and it is estimated
that 3 percent of the heat given up by the hot fluid is lost from
the heat exchanger. If the overall
the surface area of the heat exchanger are 1150 W/m2·K and
4 m2, respectively, determine the rate of heat transfer to the cold water and the log mean temperature difference for this
heat exchanger.
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