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H-H25 Cp Calculation
#1
Posted 27 October 2019 - 03:26 AM
I am doing the H-H25 energy balance for scrubber. After cross check with old excel provided by my superior. I found out the integration is different.
For example, to calculate H-H25 of O2 at 300 C, I integrate the heat capacity correlation and form the following formula.
h_25 = (a * T + 1 / 2 * b * T ^ 2 + 1 / 3 * c * T ^ 3 + 1 / 4 * d * T ^ 4 + 1 / 5 * e * T ^ 5) / M - (a * 298.15 + 1 / 2 * b * 298.15 ^ 2 + 1 / 3 * c * 298.15 ^ 3 + 1 / 4 * d * 298.15 ^ 4 + 1 / 5 * e * 298.15 ^ 5)
however I found out that the excel is using
h_25 = (a * T + 2 * b * c / (exp(2 * c / T) - 1) + 2 * d * e / (exp(2 * e / T) + 1) - a * 298.15 - 2 * b * c / (exp(2 * c / 298.15) - 1) - 2 * d * e / (exp(2 * e / 298.15) + 1)
My question is, why they are using different integration method
#2
Posted 27 October 2019 - 06:32 AM
https://www.cheric.o...d=1935&prop=CPG
Hi,
Not using the same correlation !
note : the coefficients a,b,c,d are not the same ….
I've added a link to a Korean Data base which is using a similar polynomial form .
Good luck
Breizh
Edited by breizh, 27 October 2019 - 09:19 PM.
#4
Posted 28 October 2019 - 06:32 AM
Hi ,
To add to my previous reply other correlations with range of applicability .
Document issued by Ankur (moderator in this forum) a few years ago.
Good luck
Breizh
https://www.cheric.o...d=1935&prop=CPG
Hi,
Not using the same correlation !
note : the coefficients a,b,c,d are not the same ….
I've added a link to a Korean Data base which is using a similar polynomial form .
Good luck
Breizh
Hi Breizh,
Really appreciate your time and help. I just got to know there is different coefficient for this calculation.
It raised another question. which coefficient is more accurate ? The temperature range is around 25c to 500 c
Edited by coolgoh98, 28 October 2019 - 06:32 AM.
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