Leung's method - LMTD query
Leung's method - LMTD query
(OP)
Hello all,
I wish to calculate vent area required for two phase release by Leung’s method.
There is a term called ‘q’ with units W/kg i.e. total heat input per unit mass.
I wish to consider a release scenario and confused with LMTD.
Say reactor jacket is 95% full of water [at 20 degC] and locked in by closed outlet or drain valve and reactor mass at high temperature say 200 degC. Jacket has relief valve relieving temperature is 170 degC.
What would be the LMTD here?
Would that be….. LMTD = [(200-20)-(200-170)]/Ln[(200-20)/(200-170)] = ca. 83 degC
OR
Simply the difference between 200-170 = 30 degC?
Thanks in advance.
Regards, KS
I wish to calculate vent area required for two phase release by Leung’s method.
There is a term called ‘q’ with units W/kg i.e. total heat input per unit mass.
I wish to consider a release scenario and confused with LMTD.
Say reactor jacket is 95% full of water [at 20 degC] and locked in by closed outlet or drain valve and reactor mass at high temperature say 200 degC. Jacket has relief valve relieving temperature is 170 degC.
What would be the LMTD here?
Would that be….. LMTD = [(200-20)-(200-170)]/Ln[(200-20)/(200-170)] = ca. 83 degC
OR
Simply the difference between 200-170 = 30 degC?
Thanks in advance.
Regards, KS





RE: Leung's method - LMTD query
Any input on this would be appreciated...
RE: Leung's method - LMTD query
Why is the 20 included in your LMTD calculation? The jacket's either at 20 or 170 if the jacket has stopped flowing water.
RE: Leung's method - LMTD query
Agree, 200-170 = 30deg C make more sense here.
Regards,
KS