Dear Issa, You foget that U-value normaly its U=1/R and on R influence convective and radiative heat transfer coefficent (inside and outside wall) and never U-value will be devided by 2 if you change thikness single layer frpm 0.1 to 0.2 m.
Regards Dorota ----- Original Message ----- From: "Issa Jaffal" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, March 15, 2007 3:30 PM Subject: [TRNSYS-users] Problem in creating a new wall type > Dear All > When i was trying to make a new wall type in the wall type manager; i > couldnt explain how the Uvalue in the wall type manager is calculated, > for istance: > > if i make a wall with a single layer of 0.1 m of Concrete U-value = > 4.595 and if i make a wall with a single layer of 0.2 m of Concrete > (same layer type) U-value=3.770 but normaly the U-value will be devided > by 2 if i double the thikness form 0.1 to 0.2!!! > > I tried to change the values of convective heat transfert coefficient > but the Uvalue didnt change: > > So how we can explain theses values the U-value ? > > Regards > Issa JAFFAL > _______________________________________________ > TRNSYS-users mailing list > [email protected] > https://www.cae.wisc.edu/mailman/listinfo/trnsys-users > > _______________________________________________ TRNSYS-users mailing list [email protected] https://www.cae.wisc.edu/mailman/listinfo/trnsys-users
