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I want to model a building with 18 different zones that should be heated with radiators, using a single water to water heat pump. I am wondering if I have to define heating type in TRNBUILD or not. I used a diverting valve for distribution (Type647_v2a) and a mixing valve for collection ((Type649_v2a)) of the heating fluid
Furthermore, since the zones have large floor area, how can I model each zone with multiple radiators and not with a big radiator with a large emitter length?
Thanks
The HEATING type that is built into TRNBuild/Type56 is idealized so that you tell it what temperature should be maintained in the zone and Type56 will compute the amount of energy required to maintain that temperature. That kind of simulation is referred to as "energy rate control." If you want to model real radiators then you're moving into a kind of simulation called "temperature level control" where you will define a thermostat, a boiler, some piping, distribution and mixing valves as you have done but also some kind of emitter component. Which Type you choose to model the emitters will determine how they interact with Type56. In some cases the radiator model will want to connect to Type56 by means of a gain to the space. In other cases the emitter might connect to Type56 by means of a VENTILATION type defined in TRNBuild. A VENTILATION type just means that there is air entering the zone at a particular temperature, humidity, and flow rate; the source of the air is not relevant to the definition in the zone.
As a side note there is a radiator component in the TESS HVAC library.
kind regards,
David
DavidBradley 12/02/2024 5:00 pm
I forgot to mention that you can define as many gains and/or ventilations in the zone as you want. You can group all the emitters together or you can treat them individually.
David
