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hello there,
wanted to ask about the connection between these five materials,
1-multizone-building (type 56)
2-water pump type( which one is the best? i'm working on type 3b is it ok? )
3-air to water heat pump (type 941)
4-thermostat (type 166)
5- active layer as an input (mass flow rate and temperature type 14h)
how can i connect these to make a full hydronic loop?
Thanks!
tagreedwael Topic starter
09/11/2025 9:50 am
Hello, I also have another question , can the active layer mass flow rate become an output from the multi-zone building?
Thanks!
Typically you would set up the active layer in TRNBuild so that it has an inlet temperature and mass flow rate defined as inputs to Type56. You would then make sure that idealized heating and cooling are turned off in TRNBuild. You would set the thermostat to watch the zone temperature. It's heating output signal would go to both the pump (Type3 is fine) and to the heat pump. The heat pump, pump, and active layer would all be connected in a loop, perhaps with some instances of a pipe model as well. Make sure that your simulation time step is on the order of 1-5 minutes and also give some thought to whether you want the thermostat to be watching the zone air temperature, or perhaps the liquid outlet temperature. Because they have significant mass (and thus thermal inertia) radiant floors can be challenging to control, particularly if there are night setback temperatures.
Type56 NTYPE112 (MFLAL) is the mass flow rate of liquid exiting an active layer. That NTYPE may not have been available in Type56 before v18. If it isn't available in your version you can always pass the flow rate of liquid going into the active layer from whatever the upstream component is to the component downstream of the floor (bypassing Type56 with the flow but not the temperature).
~david
tagreedwael Topic starter
24/11/2025 9:22 am
@davidbradley Hello david, after adding the thermostat and did what you told me to do, i had a results as showing in the pdf file, are these results normal?
another question, you said to do a instance pipe model, did you mean by that adding type 993 (radiant floor) or only in TRNbuild active layer settings? and also can i add this type and also have an active layer in the building? or no?
hope you can calrify the idea for me.
Thanks!
