Thermodynamics HW Solutions 819

Thermodynamics HW Solutions 819 - Chapter 10 Boiling and...

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Chapter 10 Boiling and Condensation 10-31 Cold water enters a steam generator at 20 ° C and is boiled, and leaves as saturated vapor at boiler pressure. The boiler pressure at which the amount of heat needed to preheat the water to saturation temperature is equal to the heat of vaporization is to be determined. Assumptions 1 Steady operating conditions exist. 2 Heat losses from the steam generator are negligible. Properties The properties needed to solve this problem are the heat of vaporization h fg and the specific heat of water C p at specified temperatures, and they can be obtained from Table A-9. Water, 100 ° C Steam generator Water, 20 ° C Steam 100 ° C Analysis The heat of vaporization of water represents the amount of heat needed to vaporize a unit mass of liquid at a specified temperature, and represents the amount of heat needed to preheat a unit mass of water
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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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