I would like to know what would be the effects/downsides of adding a second evap core to my 95 Jeep Wrangler. I know this seems like a strange thing to ask as the evap housing will need modified etc., and they sell aftermarket AC's and stuff, but adding a second core is really the only feasible modification I can do. If it's too dumb of an idea then I will simply not do it, and stick with the one core. However, I am OK with the cost and general modifications required so the only question is effectiveness and other necessary changes to the system.
In general, I have heard that the positive effect would be minimal unless I also changed out the compressor and condenser. However, the main thing to remember is that I want to install them, not so that I have twice the frontal area, but so that I effectively have a core that is twice as thick. I am curious if that change alone would provide significant benefit.
Questions:
- Would putting the evap coils in series (relative to the airflow) give the intended effect of increasing the overall effectiveness of the A/C system? In other words the duct cross section is the same, but with twice the overall core thickness. If so, I would assume the coils should be plumbed in series in an arrangement where the coil next to the capillary tube is the one that the air hits second. (i.e. a "counterflow" arrangement as is typical in heat exchangers).
- I would have to increase the mass of the refrigerant charge when refilling it, right? How should that number be figured? In proportion to the volume of the system relative to the initial system volume, or is it more complicated than that?
