Realizamos un balance de energía
-Qs = m(h2 - h1) + m(V²/2 - V1²/2)
Con las presiones dadas nos dirigimos a la tablas de propiedades termodinámicas en vapor sobrecalentado
P1 = 800 kPa T = 400°C
h1 = 3267.7 kJ/kg
v1 = 0.38429 m³/kg
P2 = 200 kPa T = 300°C
h2 = 3072.1 kJ/kg
v2 = 1.31623 m³/kg
Calculamos el flujo masico,
m =dA1V = A1V/v1
m = 800cm²(1/100)²*10m/s / 0.38429 m³/kg
m = 2.05 kg/s
De la ecuacion de balance de energía
-25kW = 2.05kg/s(3072.1 kJ/kg - 3267.7 kJ/kg) + 2.05kg/s(V²/2 - (10m/s)²/2)
V2 = 606 m/s
Flujo volumetrico
Q = mv2
Q = 2.05kg/s * 1.31623 m³/kg
Q = 2.7 m³/s
A coming of age ceremony that an American girl has is a sweet 16. A Latin American or Mexican girl has a Quinceanera. A sweet 16 is a party for a young girl turning 16. A Quinceanera is given to a girl on there 15th birthday
The best answer would be "B" 100% POSITIVE
