Mar 21st 2017, 02:50 PM
Join Date: Jan 2017
That helps a little bit. Well maybe it helps a lot, but I'm still unsure. So I have h=heat trans coeff. and resistance due to convection =(T_s-T_f)/q_x=1/(Ah) where T_s is solid temp, T_f is fluid, q_x is flux, A is cross-sec area, and h is heat trans coeff. Now as far as stagnant air goes, I have that inside the glass, but what about the exterior temperature? Can I disregard the "fluid outside" and treat the outside piece of glass as the -15c, because that seems like a problem. I don't know that it is, I'm just thinking that if the inside is some temp, 1, the air gap is temp 2 at inner glass interface, temp 3 at outer glass interface, and outside is temp 4 , then the outside glass isn't actually at temp 1 until / if the system is at equilibrium. As I said, can I make that assumption, and simply disregard air inside and outside? like: (T1-T4)/q_x=Rk_1+Rk_2+Rk_3?