An 8-m-internal-diameter spherical tank made of1.5-cm-thick stainless steel (k = 15 W/m·K) is used to storeiced water at 0°C. The tank is located in a room whose temperatureis 25°C. The walls of the room are also at 25°C.The outer surface of the tank is black (emissivity « = 1),and heat transfer between the outer surface of the tank andthe surroundings is by natural convection and radiation. Theconvection heat transfer coefficients at the inner and theouter surfaces of the tank are 80 W/m2·K and 10 W/m2·K,respectively. Determine (a) the rate of heat transfer to theiced water in the tank and (b) the amount of ice at 0°C thatmelts during a 24-h period. The heat of fusion of water atatmospheric pressure is hif = 333.7 kJ/kg.
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.
An 8-m-internal-diameter spherical tank made of
1.5-cm-thick stainless steel (k = 15 W/m·K) is used to store
iced water at 0°C. The tank is located in a room whose temperature
is 25°C. The walls of the room are also at 25°C.
The outer surface of the tank is black (emissivity « = 1),
and
the surroundings is by natural
convection heat transfer coefficients at the inner and the
outer surfaces of the tank are 80 W/m2·K and 10 W/m2·K,
respectively. Determine (a) the rate of heat transfer to the
iced water in the tank and (b) the amount of ice at 0°C that
melts during a 24-h period. The heat of fusion of water at
atmospheric pressure is hif = 333.7 kJ/kg.
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