Hi again guys.....I've sort of been taking some time out of dreaming up cooling solutions....this last attempt although it worked was somewhat abortive due to the risks and tbh having submerged my whole pc in liquid butane anything else I was able to think up all seemed a little lack lustre.
But I haven't been able to shut down completely.....its an addiction and I keep mulling over possibilities.
One thing for sure is the next project has to be safe (or the wife will divorce me).
As before I want to use a stripped down ac unit as the cooling source instead of custom built phase change units and I want phase change to form a major part of the component cooling.
I am going to abandon the full submersion aspect of the previous design as suitable submersion fluids capable of phase change are either too expensive, not available to the public or flammable.
My most recent idea and the one I'm seriously considering is somewhat hard to describe, it would be in some ways similar to my previous project being a large sealed vapour chamber using water/glycol mix as the working fluid, the evap of the ac unit would be inside the unit cooling the vapour.
The pc components would be housed in a separate sealed chamber and the liquid phase from the vapour chamber would be pumped to that chamber to cool both the chamber and components.
So it would be very similar to having a separate reservoir containing the ac unit evap and cooling fluid except that this reservoir would be a vapour chamber at low pressure, so that the fluid being pumped around the loop would not only cool by conduction but would also phase change at the hot components increasing the cooling efficiency.
The one problem that I envisage would be that the vaporisation process would liberate pure water vapour free from the glycol antifreeze and so would re-condense as ice on the evap fins. This could be overcome by having the return flow from the cooling loop running over the evap fins so that the water/glycol mix would melt the ice which had formed.
It has the potential to deliver powerful cooling as it combines both standard water loop conductive cooling and phase change, the vaporisation of water which absorbs about 10X the energy per cm^3 of liquid evaporated when compared to refrigerants.
So early days with this yet.....as ever...any thoughts guys?