Heat Exchangers with Fined Tubes

Have you compared your design between existing technology? The question matrix you need to start developing to properly move forward needs to outline your goals, then your techniques, then your issues. It seems that you may have accomplished this and that you are asking specific to travel of heat from point to point, but I suppose the question you need to ask yourself is will you not find better results using a material that will better conduct heat and allow it to move rather then insulate it and contain. If you are trying to fully reuse the gases then you might want to incorporate a few filters to better reuse your gases (clean them up) and perhaps a coil down the middle or along the walls to better capture the heat energy.

I need more info about your design. Exactly what type of exchanger are u using? (Shell and tube, cross flow with circular tubes, and so on) By the way, where are u going to school?