EXAMIANS
The amount of heat flow through a body by conduction is
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Heat is closely related with
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40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is
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The concept of overall coefficient of heat transfer is used in case of heat transfer by
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Heat flows from one body to other when they have
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The unit of overall coefficient of heat transfer is
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Moisture would find its way into insulation by vapour pressure unless it is prevented by
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The ratio of the energy absorbed by the body to total energy falling on it is called
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A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is
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The heat transfer by conduction through a thick cylinder (Q) is given by (where T₁ = Higher temperature, T₂ = Lower temperature, r₁ = Inside radius, r₂ = Outside radius, l = Length of cylinder, and k = Thermal conductivity)
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