Thermodynamics HW Solutions 800

Thermodynamics HW Solutions 800 - Chapter 10 Boiling and...

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Chapter 10 Boiling and Condensation 10-19 Water is boiled at sea level (1 atm pressure) and thus at a saturation (or boiling) temperature of T sat = 100 ° C by a copper heating element. The surface temperature of the heating element and its power rating are to be determined. Assumptions 1 Steady operating conditions exist. 2 Heat losses from the coffee maker are negligible. 3 The boiling regime is nucleate boiling (this assumption will be checked later). 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 . Also, 0.0130 and n = 1.0 for the boiling of water on a copper surface (Table 10-3 ). Note that we expressed the properties in units specified under Eq. 10-2 connection with their definitions in order to avoid unit manipulations. C sf = P = 1 atm 1 L Water, 100 ° C Coffee maker Analysis
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This note was uploaded on 01/24/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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