Bir buzdolab?n?n buharla?t?r?c? k?sm?ndaki hava, içinde so?utucu ak??kan?n -20°C'de
The air in an ice evaporator section will be cooled by passing through a bundle of pipes with an
outer diameter of 0.8 cm and a length of 0.4 m, in which the refrigerant is evaporated at -20C.
The air approaches the pipe bundle perpendicularly at 0C and 1 atm at an average velocity of 4m
/s. The rods are arranged longitudinally and transversely with $S_1 = S_t = 1,5cm$. In the direction of
flow, there are 15 rows of 30 pipes each.
A) the cooling capacity of this system
B) Find the pressure drop across the pipe bundle
properties of air at average temperature
k = 0,02326 W/m.K
$\rho$ = 1,316 kg/m3
$c_p$ =1006 J/kg-K
Pr = 0,7375
$\mu$ = 1,705 × $10^{-5}$ kg/m.s
$Pr_s$ = Pr@$T_s$ = 0,7408
0C density of air
$\rho_1$ = 1,292 kg/m³
f = 0,27, x = 1
$Nu_D$=0,27$Re_D^{0.63} Pr^{0.36} (Pr/Pr_s)^{0.25}