Dear all,
I want to calculate the wall gains or heat gain from the building envelope for my building type 56 with one zone/ air node. I read "Volume 5 Multi-zone Building modeling with Type56 and TRNBuild". I stumbled upon the energy balance equation where all the energy coming in and out are written. The equation is (NTYPE 904)
B4_QBAL =- B4_DQAIRdt + B4_QHEAT - B4_QCOOL + B4_QINF + B4_QVENT + B4_QCOUP + B4_QTRANS + B4_QGINT + B4_QWGAIN + B4_QSOL + B4_QSOLAIR [kJ/hr].
I printed this balance as Energy_zone.BAL. When i checked the file B4_QWGAIN is 0 and B$_QSOLAIR is also 0. Why are they zero?
So, I was wondering what B4_Qwgain is? ( I am particularly interested in it because i need to calculate the heat gain through the envelope).
As per what I have read from the manual it says, wall gain is something that is fed by the user (can’t it be calculated by TRNSYS). (Should i feed it when defining the wall type as in fig? (surface gain inside and surface gain inside?)
My question is how to
calculated the heat gain from the building envelope?
I need it because of the cooling load that I calculated for my system (CHILLED CEILING + DOAS) is too low as compared to thumb rule calculation.
Is my cooling load low due to not keeping any value in geosurf? What value should i use for geosurf?
Thanking you in anticipation
Ashmin Aryal