Thermodynamics HW Solutions 798

Thermodynamics HW Solutions 798 - Chapter 10 Boiling and...

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Chapter 10 Boiling and Condensation 10-17 Water is boiled at 84.5 kPa pressure and thus at a saturation (or boiling) temperature of T sat = 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. Assumptions 1 Steady operating conditions exist. 2 Heat losses from the boiler are negligible. 3 The boiling regime is nucleate boiling (this assumption will be checked later). 4 Heat transfer through the bottom of the pan is one-dimensional. Properties The properties of water at the saturation temperature of 95 ° C are (Tables 10-1 and A-9) P = 84.5 kPa 95 ° C Water ρ σ l v l = = = = 9615 050 0 0599 185 . . . . kg / m kg / m N/m Pr 3 3 h fg l pl =⋅ ° 2270 10 0 297 10 4212 3 3 J/kg kg m / s C J / k g C μ . Electric burner, 3 kW Also, k steel = 14.9 W/m ⋅° C (Table A-3), C sf = 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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