An object is heated to 90°C and is kept in a room where the ambient temperature is around 25°C. If the object has an emissivity of 0.4 and an area of 2.0 m² what will be the rate of heat transfer by radiation alone?
An object is heated to 90°C and is kept in a room where the ambient temperature is around 25°C. If the object has an emissivity of 0.4 and an area of 2.0 m² what will be the rate of heat transfer by radiation alone?
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Transcribed Image Text:An object is heated to 90°C and is kept in a room where the ambient temperature is around 25°C. If the object has an emissivity of 0.4 and an area of 2.0 m², what will be the rate of heat transfer by radiation alone?
Expert Solution
Introduction:
- Heat transfer can take place without any medium. This type of heat transfer is known as heat radiation. In radiative heat transfer, the heat energy is carried by electromagnetic radiation.
- The rate of heat transfer through radiation is given by Stefan-Boltzmann's law of radiation. It is given by,
Here σ is the Stefan-Boltzmann constant, e is the emissivity which defines how well an object radiates energy, A is the area, and T is the absolute temperature in kelvin.
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