Question

Consider a hollow core printed circuit board 11.8 em high and 16.4 em long, dissipating a total of 21.0 W. The width of the air gap in the middle of the PCB is 0.239 em. If the cooling air enters the 11.8-em-wide core at 28°C and 1 atm at a rate of0.682 L/s, determine the average temperature at which the air leaves the hollow core. T2 = | |°C (Round to one decimal place)

Answer 1

estio abte Cp Kけ1Kg-k ↑.ooso = emst ttso aiven that eat dig1 pia Cu .174 びaİ'Y 0.682¢t eu 0.000682-n 2 1-177 ㅈ ㅇ .68 2X10 = 2 + 28 a . go 23 X 1-005 -千657e -116.6c p being eg- oejn't caU e