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[TRNSYS-users] Trnflow output : Difference between NType 209(PRESZ) and NTYPE 266(PRESL)



Hello, Trnsys users
I am doing a study on pressure and airflow in a building with Trnflow.

I have a question about the output of Trnflow.

NType 209 (PRESZ) is the absolute pressure difference between the inside and outside of the building, NType 266 (PRESL) is the pressure difference in the link, why is PRESL and PRESZ different in the link connecting the external and internal node points? 
PRESZ appears almost similar to NTYPE 223 (PRESE), I would like to know the reference how PRESL was calculated. 
This explanation is lacking in the Trnflow manual, so I don't know where to get the information, if you know, please explain. 

Thanks. 

Have a nice day.

-------------------------------------------------------------------------------------------
Lee Hye-In

Graduate school of Yeungnam University
Dept. of Architectural Engineering
Building Energy Systems Laboratory
280 Daehak-ro, Gyeongsan-si, Gyeongbuk-do 38541, Korea
(Tel) +82-53-810-3543; +82-10-8330-7087

gpdls0101@gmail.com