Consider an opaque horizontal plate that is well insu- lated on its back side. the irradiation on the plate is 2500 w/m^2, of which 500 w/m2 is reflected. the plate is at 227°c and has an emissive power of 1200 w/m2. air at 127°c flows over the plate with a heat transfer convection coefficient of 15 w/m^2.k. determine the emissivity, absorptivity, and radiosity of the plate. what is the net heat transfer rate per unit area?

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