Re: [TRNSYS-users] radiator type 1231

[David BRADLEY <d.bradley@tess-inc.com>]

Enyuan,
  Type1231 was developed based on correlations to model a heating radiator, not a cooling radiator and it is likely that the correlations simply do not hold true in cooling applications. I would look to a different model.  I would also be a bit careful; most in-room cooling radiators operate above the dewpoint because getting condensation all over their surfaces causes other problems.

  As for connecting Type1231's output to Type56, define an energy gain input (as opposed to a constant value or a schedule) in the zone that contains the radiator. Then connect the Type1231 heat transfer output to the gain input. I would recommend that you split the gain about 80% convective and 20% radiative. Despite their name, most radiators do significant heating by convection.
Best,
 David

On 6/28/2013 13:34, Enyuan Hu wrote:

Dear all,

I'm trying to model radiant cooling using the type 1231 radiator in TESS library for TRNSYS 17. The model may be loose for cooling as condensation is not considered, but we want to have some idea of the effect when only convection and radiation are dominant. I'm looking for answers to two questions:

1. Is there any example or tutorial that shows how the radiator can be used with type 56, or how they communicate?

2. In searching previous threads on using the radiator, it seemed that there's restriction on the inlet water temperature, that it, it must be at least 0.5C above the room temperature. Can we circumvent this restriction?

Thanks.

Enyuan

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