Physics, 11.12.2019 18:31 kyliefetters11

Water vapor at 5 bar, 320 8 c enters a turbine operatingat steady state with a volumetric flow rate of 0.65 m 3 /s andexpands adiabatically to an exit state of 1 bar, 160 8 c. kineticand potential energy effects are negligible. determine forthe turbine (a) the power developed, in kw, (b) the rate ofentropy production, in kw/k, and (c) the isentropic turbineefficienc

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Answer from: callmedarthvadorplz

371.3/435.12=0.8524

Explanation:

P1 = 5 bar

T1 = 320 deg. C

AV = 0.63 m^3/s

Q = 0 (adiabatic)

P2 = 1 bar

T2 = 160 deg. C

EK = EP = 0

(a) Power developed.

h1 = h(P1,T1) = 3106.0715

h2 = h(P2,T2) = 2796.1667

ρ1 = 1.8463 kg/m^3

s1 = s(P1,T1) = 7.5322 kJ/kg.K

s2 = s(P2,T2) = 7.6601 kJ/kg.K

h2s = (P2,s1) = 2742.5234

Mass flow rate

m_dot = AVρ = 1.163169 kg/s

Energy balance for steam turbine at steady state,

0 = Q - W + m_dot*(h1 - h2)

W = m_dot*(h1 - h2) = 360.47 kW

(b)

Entropy balance for control volume

o = Q/T + m_dot(s1-s2) + σ

σ = m_dot(s2-s1) = 1.163169*(7.6601 - 7.5322)

σ = 0.1488 kW/K

(c)

ηs = h1 - h2 / h1 - h2s

ηs = 3106.0715 - 2796.1667 / 3106.0715 - 2742.5234

ηs = 0.8524

Answer from: Quest

You will hear a hissing sound because of the carbon dioxide escaping the can or bottle

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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Water vapor at 5 bar, 320 8 c enters a turbine operatingat steady state with a volumetric flow rate...

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