Thermodynamics HW Solutions 61

Thermodynamics HW Solutions 61 - Chapter 1 Basics of Heat...

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Chapter 1 Basics of Heat Transfer Review Problems 1-121 Cold water is to be heated in a 1200-W teapot. The time needed to heat the water is to be determined. Assumptions 1 Steady operating conditions exist. 2 Thermal properties of the teapot and the water are constant. 3 Heat loss from the teapot is negligible. Properties The average specific heats are given to be 0.6 kJ/kg. ° C for the teapot and 4.18 kJ/kg. ° C for water. Analysis We take the teapot and the water in it as our system that is a closed system (fixed mass). The energy balance in this case can be expressed as EE E EU U U in out system in system water tea pot −= == + Δ ΔΔ Δ Then the amount of energy needed to raise the temperature of water
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This note was uploaded on 01/14/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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