Thermo test 2

Question 1

closed system eq

Answer 1

Q-W=DU

Question 2

Open System - steady state steady flow

Answer 2

Q+m(in)[h+(v^2/2)+gz]in = W(shaft) + m(out)[h+(v^2/2)+gz]out

Question 3

Nozzle or Diffuser

Answer 3

m(in) = m(out)
[h+(v^2/2)]in = [h + v^2/2]out

Question 4

Turbine or compressor

Answer 4

W(shaft) = m[h + v^2/2]in - m[h + v^2/2]out + Q
m = min=mout
Q is usually 0

Question 5

Throttling Valve

Answer 5

h(in)=h(out)

m(in)=m(out)

Question 6

Mixing chamber and heat exchanger

Answer 6

sum of m(in) = sum of m(out)

sum of m(in)h(in) = sum of m(out)h(out)

Question 7

Adiabatic

Answer 7

there is still some work just not that one kind

DU is also 0 if DT is 0