A flat-plate solar collector is used to heat water by having water flow through tubes attached at the back of the thin solar absorber plate. The absorber plate has a surface area of 2 m2 with emissivity and absorptivity of 0.9. The surface temperature of the absorber is 35°C, and solar radiation is incident on the absorber at 500 W/m2 with a surrounding temperature of 0°C. Convection heat transfer coefficient at the absorber surface is 5 W/m2∙K, while the ambient temperature is 25°C. Net heat rate absorbed by the solar collector heats the water from an inlet temperature (Tin) to an outlet temperature (Tout). If the water flow rate is 5 g/s with a specific heat of 4.2 kJ/kg∙K, determine the temperature rise of the water.
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 flat-plate solar collector is used to heat water by
having water flow through tubes attached at the back of the
thin solar absorber plate. The absorber plate has a surface
area of 2 m2 with emissivity and absorptivity of 0.9. The surface
temperature of the absorber is 35°C, and solar
is incident on the absorber at 500 W/m2 with a surrounding
temperature of 0°C.
absorber surface is 5 W/m2∙K, while the ambient temperature
is 25°C. Net heat rate absorbed by the solar collector heats
the water from an inlet temperature (Tin) to an outlet temperature
(Tout). If the water flow rate is 5 g/s with a specific heat of
4.2 kJ/kg∙K, determine the temperature rise of the water.
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