PROBLEM $3$:

The below figure represent a simplified air$-$conditioning heat exchanger

system. Neglecting kinetic and potential energy effect, determine at steady

state.

a$)$ The mass flow rate of R$-134$a in kg$/$s

b$)$ Heat transfer rate between the air and the refrigerant

$1234$

AIR AIR R$-134$a R$-134$a

P$1=1$ bar P$2=0\mathrm{.}95$ bar P$3=5$ bar P$4=5$ bar

T$1=32$ oC T$2=22$ oC X$3=0\mathrm{.}2$ T$4=20$ oC

$($AV$)1=50$ m$3/$min