Wall temperature in heat exchanger

[goggles31]

My notes, using an example of a cold tube-side liquid cooling down a hot shell-side liquid stated that:
ΔTb = T_bS-T_bT
Mean tube-side wall temperature:
T_wT=T_bT+(tube-side film resistance)/(total resistance) * ΔT_b

Mean shell-side wall temperature:
T_wS=T_bS-(shell-side film resistance)/(total resistance) * ΔT_b

S stands for shell and T stands for tube. How would the equations change if the hot fluid is in the tube and the cold fluid is in the shell?

 

[_coyote_]

The equations would change to:ΔTb = TbT-TbSMean tube-side wall temperature:TwT=TbT-(tube-side film resistance)/(total resistance) * ΔTbMean shell-side wall temperature:TwS=TbS+(shell-side film resistance)/(total resistance) * ΔTb