HW1 solution

# HW1 solution - CHE/ME 109 Homework Assignment 1 Chapter...

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CHE/ME 109 Homework Assignment 1 Chapter 1 (1.1-1.5) Problem 1. A computer has vent holes on opposite sides and a fan installed in the computer provides a flow of air with a constant mass flow rate into and out of the computer of 15 g/minute. Electronic components in the computer generate a total of 15W of heat. The air entering the computer is at 1 atm of pressure and has a temperature of 25 0 C. a. Calculate volume flow in with ideal gas law. (15 g/min)/(29 g/g-mol)= 0.517 mol/min P V = RT => (1 atm)* V =(0.517 mol/min)*(0.08206 lit*atm*mol n & -1 *K -1 )*298K V = 12.6 lit/min b. Calculate the T of the air from T C m Q P = 15 J/sec = (15 g/min) *(min/60 sec)*(1.005 J/g/ 0 C)* T T=59.7 0 C c. Calculate the exit air volume at the exit temperature. P V = RT => (1 atm)* V =(0.517 mol/min)*(0.08206 lit*atm*mol n & -1 *K -1 )*(358K) V = 15.2 lit/min This is a very high air flow rate. In the real situation, the total power is spread out in the computer and therefore one only needs to be concerned with the sensitive parts, namely,

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HW1 solution - CHE/ME 109 Homework Assignment 1 Chapter...

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