Heat-transfer Questions Set 12:
Which of the following is not a low temperature insulation?
Solution:
A black body has a surface temperature of 60°C. Calculate the heat flux at the surface of the black body.
Solution:
A 3.2 mm diameter stainless steel wire, 30 cm long has a resistivity of 70 × 10⁻⁸ Ω⋅m. Calculate the resistance of the wire.
Solution:
In a psychrometric process, the sensible heat added is 60 kJ/s and the latent heat added is 40 kJ/s. What is the sensible heat factor for the process?
Solution:
What happens to the thermal conductivity of a gas as the temperature increases?
Solution:
What is the typical value of the overall heat transfer coefficient for air to low viscosity liquid?
Solution:
A refrigeration system's condenser rejects heat at a rate of 160 kW, while its compressor consumes 60 kW of power. What is the coefficient of performance (COP) of this system?
Solution:
Choose the correct statement about the properties of a diathermal body, where:
absorptivity - α
reflectivity - ρ
transmissivity - τ
Solution:
Radiant energy with an intensity of 800 W/m² strikes a flat plate normally. The absorptivity is three times the reflectivity and twice the transmissivity. Determine the rate of reflection.
Solution:
Find the heat transfer rate from a hot surface for 6 fins of 10 cm length. The base temperature of the fin is maintained at 200 degrees Celsius and the environment is at 15 degrees Celsius with a convective coefficient of 25 W/m²·K. Each fin has a cross-sectional area of 2.5 cm² and is made of a material with a thermal conductivity of 250 W/m·K.
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