Hydronic Radiant Heat Design
I know this question has been debated before and that there are a lot of mixed opinions about the SANCO2 HPWH, but want to approach the topic again. I understand it requires substantial lift to maintain the COP and that it takes some planning or a “science project” to make it work, but we are a group of engineering students designing a 634 SF home. It will eventually be lived in but the owners are pushing for a radiant system even if it doesn’t have the ROI.
That being said, why can’t we just run shorter loops with a larger spacing on center and use a higher temperature. Currently with the envelope we’ve designed and modeled we have a peak heat loss of about 8000 btuh. So about 12.6 Btu/SF. Yes small but when the DHW load matches if not surpasses the heating load it seems like sense to combine the systems.
I am new to hydronic radiant design (besides the basic principles and equations) but have been reading Modern Hydronic Heating along with a few other resources. Any other recommendations welcome.
I would love some advice or to have someone help me in the right direction. For instance the SANCO2 can supply 18.5 GPH with a lift of 95°F. So a ∆T=(145-50). Lets say we then supply the floor with 100 °F water and want to maintain the space at 75°F then the flow rate would be .64 GPM. Since technically the SANCO@ can only supply .31 GPM would we want to match the flow rate to the water heater or alter length of the loops/runs if that makes sense. Because you can always tackle it from there ways right? Loop spacing/ runs, supply temp, and flow rate?
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