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FHA to HWB conversion project
My force air system stopped functioning recently after 30+ years of service. Not being a fan of forced air, I am in the process of pulling together a design for a low temperature baseboard hot water system for my modest home located outside of Springfield Mass. The house was built in 1965 and utilized electric heat until 1983 (many of the radiators are still in the house). The house has four levels, one of which is slab-on grade. On the slab level, there is a family room and spare bedroom/den with carpet over the slab, and a bathroom with ceramic tile on the concrete slab. I have taken careful measurements and worked up a room-by-room heat loss calculation in a spreadsheet to help size the radiation.
Question: How do I calculate the heat lost to the concrete slab in these three rooms? I've searched the internet for answers but can't seem to find one. In my analysis (attached) I've assumed a slab temp of 50F and an R factor of 2.1 for the carpeted slab and 1.1 for the tiled slab, but I imagine the slab is much colder around the exterior perimeter.
Thoughts? Comments? Thank you. --=--Ed.
Hydronics inspired homeowner with self-designed high efficiency low temperature baseboard system and professionally installed mod-con boiler with indirect DHW. My system design thread: http://forum.heatinghelp.com/discussion/154385
System Photo: https://us.v-cdn.net/5021738/uploads/FileUpload/79/451e1f19a1e5b345e0951fbe1ff6ca.jpg