Thermodynamics HW Solutions 791

Thermodynamics HW Solutions 791 - Chapter 10 Boiling and...

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Chapter 10 Boiling and Condensation 10-11 Water is boiled at 1 atm pressure and thus at a saturation (or boiling) temperature of T sat = 100 ° C in a mechanically polished stainless steel pan whose inner surface temperature is maintained at T s = 110 ° C. The rate of heat transfer to the water and the rate of evaporation of water are to be determined. Assumptions 1 Steady operating conditions exist. 2 Heat losses from the heater and the boiler are negligible. Properties The properties of water at the saturation temperature of 100 ° C are (Tables 10-1 and A-9) ρ σ l v l = = = = 957 9 060 0 0589 175 . . . . kg / m kg / m N/m Pr 3 3 h fg l pl =⋅ ° 2257 10 0 282 10 4217 3 3 J/kg kg m / s C J / k g C μ . P = 1 atm 110 ° C 100 ° C Water Also, 0.0130 and n = 1.0 for the boiling of water on a mechanically polished stainless steel surface (Table 10-3 ). Note that we expressed the properties in units specified under Eq. 10-2 in connection with their definitions in order to avoid unit manipulations. C sf = Heating Analysis The excess temperature in this case is Δ TTT s = = = ° sat C 110 100 10 which is relatively low
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