• ISHAN

MemberApr 2, 2014

Rate Of Heat Transfer Problem

2kg of Water at 1 atm boils in 30 minutes. Find the rate of heat transfer to the water.

Is the solution correct? The given options are not having my answer

a. 2.51KW b.2.32KW c.2.97KW d.0.47KW e.3.12KW
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Replies
• MemberApr 2, 2014

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
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• MemberApr 2, 2014

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?
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• MemberApr 2, 2014

334.5 KJ/Kg is latent heat of ice and not steam.
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• MemberApr 8, 2014

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 😀)
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