Chapter 1 Basics of Heat Transfer1-34A hot copper block is dropped into water in an insulated tank. The final equilibrium temperature of the tank is to be determined. Assumptions1 Both the water and the copper block are incompressible substances with constant specific heats at room temperature. 2 The system is stationary and thus the kinetic and potential energy changes are zero, ΔΔKEPE==0 and EU=. 3 The system is well-insulated and thus there is no heat transfer. Properties The specific heats of water and the copper block at room temperature are Cp, water= 4.18 kJ/kg·°C and Cp, Cu= 0.386 kJ/kg·°C (Tables A-3 and A-9). AnalysisWe observethat the volume of a rigid tank is constant We take the entire contents of the tank, water + copper block, as the system. This is a closed systemsince no mass crosses the system boundary during the process. The energy balance on the system can be expressed as EEEUinout−==Net energy transferby heat, work, and masssystemChange in internal, kinetic,potential, etc. energies
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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.