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danyts
Posts: 4
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 Posted: Thu Jul 28, 2011 9:25 am Post subject: heating radiant fraction |
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Dear support,
I' m calculating a radiant floor for a residential building. I noticed that the "heating radian fraction" in HVAC settings is a decisive factor for radiant floor performance.
I'm usually base my calculations on the power yield of the radiant floor (for example 50 W/m2, without considering the radiant/convective component). Can you explain me how can I set this value?
Can you suggest me an appropriate heating radiant fraction for a generic radiant floor?
than you!
Regards
Daniele |
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Andy Tindale
Posts: 2617
Location: Stroud |
| Posted: Thu Jul 28, 2011 10:14 am Post subject: |
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Daniele,
We usually recommend a value of 1 for radiant heated floors. This may seem surprising, but the reason is that in simple HVAC radiant floors are modelled using a radiant heater component radiating to the floor surfaces. So ideally all of the radiant heaters energy should radiated to the floor from where it can be re-radiated to the other zone surfaces and with some small amount of convection too.
In detailed HVAC in v3 you can create a more detailed model incluidng hot water pipes buried in the construction.
Andy |
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