Moist air initially at T1 = 140°C, p1 = 4 bar, and φ1 = 78% is contained in a 2.0-m3 closed, rigid tank. The tank contents are cooled to T2 = 35°C. A. Determine the temperature at which condensation begins, in °C.
B. Determine the heat transfer, in kJ.

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