Chapter 10 Boiling and Condensation10-17Water is boiled at 84.5 kPa pressure and thus at a saturation (or boiling) temperature of Tsat= 95°C in a mechanically polished AISI 304 stainless steel pan placed on top of a 3-kW electric burner. Only 60% of the heat (1.8 kW) generated is transferred to the water. The inner surface temperature of the pan and the temperature difference across the bottom of the pan are to be determined. Assumptions1Steady operating conditions exist. 2Heat losses from the boiler are negligible. 3The boiling regime is nucleate boiling (this assumption will be checked later). 4Heat transfer through the bottom of the pan is one-dimensional. PropertiesThe properties of water at the saturation temperature of 95°C are (Tables 10-1 and A-9) P = 84.5 kPa95°C Water ρσlvl====96150500 0599185....kg / mkg / mN/mPr33hfglpl=×⋅=⋅°−2270 100 297 10421233J/kgkg m / sC J/kgCμ.Electric burner, 3 kWAlso, ksteel= 14.9 W/m⋅°C (Table A-3), Csf=0.0130 and n= 1.0 for the boiling of water on a mechanically polished stainless steel surface (Table 10-3).
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