I've been thinking about doing the same thing with my radiant heating installation. I'm thinking in my case the water shouldn't be less than 60F, to avoid condensation (from what I can tell from various charts and graphs online, 85F air temperature at 40% RH gives a dew point at about 59F). We're usually at 30-35% RH, so I'd consider 60F water to be safe.
One question that arises is how to keep the water cool. I've got a closed loop system, so it stands to reason that the water will warm up after a while, reducing the cooling effect. How quickly the water warms up is TBD - I don't think there's a good way to tell without trying.
I've considered peltier elements attached to the manifold to lower the water temperature - any thoughts?
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