[TRNSYS-users] Modulating ground source heat pump

[Jeff Thornton]

Mandrel,

Modulating heat pumps can be a bit tricky to simulate - and mostly due to the controls.  Are you going to feed the heat pump the loads or do you want to operate in pure temperature level control?  If you want to just pass in loads and have the heat pump meet them then that’s pretty easy to do.  If you want the heat pump to respond to zone conditions then you’ll need to use a detailed controller that takes the zone temperature and calculates the fraction of operating speed of the heat pump.  The other option is to have the heat pump always deliver a user-specified outlet water temperature.  These models exist typically as chillers in trnsys but we have a new set ready for the Tess library update where they can be set to deliver either a fixed hot-side or cold-side temperature. 

The library updates are going well and we hope to put them out late this summer.  It’s been a tremendous amount of work - more so than we originally planned!!

Jeff / TESS

Sent from my iPhone

> On May 28, 2021, at 10:32 AM, Manfred Schindler via TRNSYS-users <trnsys-users at lists.onebuilding.org> wrote:
> 
> 
> Hello everyone,
>  
> I want to implement a heat pump type for a water-to-water heat pump with ground as a source in my simulation, because currently the heat pump is only implemented with a view equations, not with a type. In my case a heat pump with a variable speed compressor is needed. I read some older threads in the archive to modify or extend for example type 927 (single stage water-water hp), even though it seems to just kind of fool the simulation – so does anyone know, if there is maybe already an existing complete type for a modulating ground source heat pump? If not, I want to ask again for some solutions J. I also read that there will be an update of the TESS library in 2021 – is it expected to emerge soon?
> Big thanks in advance!
> 
> Best regards,
> Manfred Schindler
> FH Technikum Wien
>  
>  
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