How to employ a mixing valve in a closed loop radiant heat system
We are just wrapping up the new roof on my project house and now its [past] time to turn our attention to HVAC – or, more specifically this time of year, Heating! This 1975 house came with radiant heat ceilings as the only source of heat. Recently we have been having night time lows in the teens and daytime highs here in Northern Nevada zone 5 at 5000 feet are usually in the 40’s. I have done some preliminary calcs on heat gain/loss, and plan on doing a full Manual J model before laying out any cash for components.
My living room is 20×22 with a southern exposure which is the dominant direction the wind comes from. I am seriously considering doing both in the floor PEX supplemented with Runtal panel radiators or slant/finn baseboard. The thing I havent been able to figure out and havent found any examples of is how would you employ a mixing valve in a closed loop system so it can send optimum 180F water to the radiant panels and still be able to send ~125F water to the PEX portion of the system?
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