So, what do you think the increase in thermal conductivity of your mix would be over a normal sand mix or concrete and what would be the real benefit?
My point is.....there is no real need to get a higher conductivity out of a concrete slab as the dT over the loop is usually appropriate for length of tubing and size of room. Having a higher heat draw out of the tube would only mean, IMO, that a typical 250' loop length would be dropped to (for example) 200'. What would the implication of that for your system? What size area are you trying to heat?
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