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#1 |
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Registered User
Trade: General Contractor
Join Date: Apr 2009
Posts: 1
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Pex Radiant Floor Heating - Heat Transfer
Does anyone know the heat transfer from 5/8" pex to concrete for different delta T's between glycol and concrete?
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#2 |
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Pro
Trade: HVAC
Join Date: Mar 2009
Posts: 1,310
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Re: Pex Radiant Floor Heating - Heat Transfer
Varies with how much glycol(10, 20, 30, 40, or 50%).
What your center is. And what you GPM is. EG: 30% glycol/water solution at 120°F entering temp, and 110°F leaving temp(10° delta). 50 BTUs per sq ft, 12" OC equals .01056GPM per foot of tubing. So 200' of tubing would have a flow rate of 2.112GPM. 20 BTUs per sq ft, 12" OC equals .00422GPM per foot of tubing. So 200' of tubing would have a flow rate of .844GPM. Both of the above BTU examples are at 10° delta. You need to know more then just delta to calculate BTUs. |
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