Re: [TRNSYS-users] Floor Heating

1) How should be the surfaces split in Trnsys3D? Have I used the right approach?

I believe that what you've done is reasonable. The autosegment feature puts a number of smaller floor areas in series.

2) How can they be manually connected? (when the Autosegmentation is done, surfaces are automatically connected in series with automatic inlet temperature and the same inlet flow rate)

I think you will need to do this by adding outputs and inputs to your Type56 model. The connections will need to be done outside of Type56 in the Simulation Studio.

3) After splitting the floors, which output shows the overall heat transfer to the zone and which one shows the final outlet fluid temperature?

I think that for the overall heat transfer to the zone you'll need to sum up a number of Type556 outputs. The overall heat transfer to the zone will be the sum of the heat transfer to the zone from each individual floor piece. The final outlet temperature will depend upon the order in which you connect the floors to one another in the Simulation Studio. I'd suggest using the surface IDs that TRNBuild assigns and drawing a picture so that you can keep all the connections straight.

4) What should be the standard number of fluid loops per square meter?

There is an equation in the TRNBuild/Type56 manual that suggests a way of computing the number of loops based on how long you want each individual pipe to be.

Hello,

I am working on a project on heating a house with a heat pump. I designed a Trnsys3D model of the house, which I need to implement a floor heating system on it. After adding an active layer in TRNbuild, got the error "Specific fluid mass flow of active layer in surface 16 below minimum value of 2.96 kg/m2h Please, increase the minimum mass flow rate or use the autosegmentation feature of TRNBuild for subdividing the surface.".

As I have a 3d model, the Autosegmentation is not possible. Therefore, following TRNbuild documentation "For airnodes with 3D geometric information the splitting of surfaces have to be done in Trnsys3D and then manually connected", I split my floors (in Sketchup) into 20 equal surfaces using parallel lines and imported my 3d model back to TRNbuild.

Here are my questions:

1) How should be the surfaces split in Trnsys3D? Have I used the right approach?

2) How can they be manually connected? (when the Autosegmentation is done, surfaces are automatically connected in series with automatic inlet temperature and the same inlet flow rate)

3) After splitting the floors, which output shows the overall heat transfer to the zone and which one shows the final outlet fluid temperature?

4) What should be the standard number of fluid loops per square meter?

Best regards

Hoofar Hemmatabady

Re: [TRNSYS-users] Floor Heating - Trnsys3D