Afreezer compartment is covered with a 2.0-mm-thick layer of frost at the time it malfunctions. if the compartment is in ambient air at 20ºc and a coefficient of1.8 w/m2 ·k characterizes heat transfer by natural convection from the exposed surface of the layer, estimate the time required to completely melt the frost. the frost may be assumed to have a mass density of 740 kg/m3 and a latent heat of fusion of 334 kj/kg. t= hours

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

Ahot wire operates at a temperature of 200°c while the air temperature is 20°c. the hot wire element is a tungsten wire of 5 um diameter and 2 mm in length. plot using excel current, heat transfer and heat generated by the wire for air velocity varying from 1-10 m/s in steps of lm/s? matlab the sensor voltage output, resistance, or assume nu 0.989 re033pr13 take air properties at tr (200°c20°c)/2 = 110°c properties of tungsten: c 0.13 kj/kg.k 3 p 19250 kg/m k (thermal conductivity) = 174 w/m.k

What is the main objective of using reheat rankine cycle?