Heat balancing problem in coal combustion

bharath · August 9, 2011, 13:34

Hi to all,
Am doing a coal combustion simulation and i got converged results.but my query is, can anybody give me a procedure or idea of how heat balancing is to be done in single inlet and single outlet model using CFX post.
thanks in advance

ghorrocks · August 9, 2011, 18:30

A converged solution should conserve energy, so energy in equals energy out. Is that what you are asking?

bharath · August 11, 2011, 09:56

yes ghorrocks what you said is right.
1) i have hot air and coal+air mixture in two different inlets and i get flue gas (co2,o2,N2,H2O and etc of different mass fraction) at single outlet.

2)In CFX post, i can get Temperature,Specific heat,Static enthalpy variables at various boundaries(Inlet,outlet,walls).But i can't get energy directly.So using this variables how i should do energy balance or is there any other way to do this? can you explain me.

ghorrocks · August 11, 2011, 19:20

You can get energy - just integrate the enthalpy over the boundary condition and you will get energy flows.

bharath · August 12, 2011, 03:16

thanks ghorrocks.i will try that.

bharath · August 16, 2011, 08:53

hi ghorrocks,

i tried that what you had told. i got output unit (SI) m^4/s^2(energy flows).if i need (Watts(SI) or m^2/s^2) as output what i have to do? i need your reply.

thanks in advance.

August 9, 2011, 13:34	Heat balancing problem in coal combustion	#1
bharath Senior Member Bharath kumar Join Date: Apr 2009 Posts: 169 Rep Power: 17	Hi to all, Am doing a coal combustion simulation and i got converged results.but my query is, can anybody give me a procedure or idea of how heat balancing is to be done in single inlet and single outlet model using CFX post. thanks in advance

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August 9, 2011, 18:30		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	A converged solution should conserve energy, so energy in equals energy out. Is that what you are asking?

August 11, 2011, 09:56		#3
bharath Senior Member Bharath kumar Join Date: Apr 2009 Posts: 169 Rep Power: 17	yes ghorrocks what you said is right. 1) i have hot air and coal+air mixture in two different inlets and i get flue gas (co2,o2,N2,H2O and etc of different mass fraction) at single outlet. 2)In CFX post, i can get Temperature,Specific heat,Static enthalpy variables at various boundaries(Inlet,outlet,walls).But i can't get energy directly.So using this variables how i should do energy balance or is there any other way to do this? can you explain me.

August 11, 2011, 19:20		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	You can get energy - just integrate the enthalpy over the boundary condition and you will get energy flows.

August 12, 2011, 03:16		#5
bharath Senior Member Bharath kumar Join Date: Apr 2009 Posts: 169 Rep Power: 17	thanks ghorrocks.i will try that.

August 16, 2011, 08:53		#6
bharath Senior Member Bharath kumar Join Date: Apr 2009 Posts: 169 Rep Power: 17	hi ghorrocks, i tried that what you had told. i got output unit (SI) m^4/s^2(energy flows).if i need (Watts(SI) or m^2/s^2) as output what i have to do? i need your reply. thanks in advance.