Answer:
U = 129.053 KJ/m².h
Explanation:
overall heat transfer coefficient (U):
U = (<em>m</em>Cp(ToutH2O - TinH2O))/[A((ToutAir - TinH2O)-(TinAir - ToutH2O))/(Ln(ToutAir - TinH2O)/(TinAir - ToutH2O))]
∴ A = 925 m²
H2O:
∴ mass flow H2O (<em>m</em>) = 45500 Kg/h
∴ Cp H2O = 4186 J/Kg°C
∴ Tin = 80°C
∴ Tout = 150°C
Air:
∴ Tin = 350°C
∴ Tout = 175°C
⇒ U = ((45500Kg/h)(4186J/Kg°C)(150-80))/(925m²)[((175-80)-(350-150))Ln((175-80)/(350-150))]
⇒ U = (1.333 E10 J/h)/(925m²)[(-150)Ln(0.475)]
⇒ U = 129052.73 J/m².h = 129.053 KJ/m².h
Answer:
No, the metal is not pure gold because density is equal to mass divided by volume and in this case we end up with about 15.3, making this metal less dense than gold.
Explanation:
Answer:
the right side of the periodic table are metals while the left side are non metals (with the exception of hydrogen)
He did not apply the fifty newtons of greater force! Ok it says when it needed to have the greater force of fifty the person only put 10N out of the fifty, and left out 40N, that is why it did not work properly.
