Rate Of Heat Transfer Problem

Replies

• 

  Krzysztof Pelc

  Answer is d. 0.47 kW
  because:
  Heat of vaporization is calculated from a temperature of 100 degrees at a 1 atm and yet you have warmed these 2 kg of water at 100 degrees .... and hence the difference
• 

  ISHAN TOPRE

  hfg for water at 100 deg= nearly (2675-491.17)=2183.83
  
  2*2183.83/(30*60)=2.42
  
  No option. How come you are getting 0.47?
• 

  ISHAN TOPRE

  334.5 KJ/Kg is latent heat of ice and not steam.
• 

  Krzysztof Pelc

  Heat of vaporization is the difference enthalpy between the points on boundary curves
  h1 = 419.71 kJ / kg, h2 = 2675.72 kJ / kg
  
  h2-h1= 2256 kJ/kg !!!!!!!!!!!!!!!!!
  
  Q=m*dh/3600 /heat related to hours
  
  Q=2*2256/(30*60)=2,51 kW
  
  Answer a. is correct - first time i go after you suggest 😀)