Chapter 10 Boiling and Condensation10-18Water is boiled at sea level (1 atm pressure) and thus at a saturation (or boiling) temperature of Tsat= 100°C by a stainless steel heating element. The surface temperature of the heating element and its power rating are to be determined. Assumptions1Steady operating conditions exist. 2Heat losses from the coffee maker are negligible. 3The boiling regime is nucleate boiling (this assumption will be checked later). PropertiesThe properties of water at the saturation temperature of 100°C are (Tables 10-1 and A-9) ρσlvl====957 90600 0589175....kg / mkg / mN/mPr33hfglpl=×⋅=⋅°−2257 100282 10421733J/kgkg m / sC J/kgCμ.Also, C0.0130 and n= 1.0 for the boiling of water on a stainless steel 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. sf=P = 1 atm1 LWater, 100°C CoffeemakerAnalysis
This is the end of the preview. Sign up
access the rest of the document.
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.