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Hi,
I was wondering if any of the existing heat pump models modulate the freezing of the heat pump and the needed defrost cycle.
As it can have a significant influence on the performance it would be great to explore this.
Best regards,
Jan
A_Weiss 12/06/2023 4:56 pm
@janboettner I definitely documented versions of the TESS HVAC library air-air heat pump models about a year ago that include defrost performance modeling, so I know it's been done. I'll have to get back to you on the availability of those models. They may not have been included in the TESSLib18 HVAC library because they were developed on a contract that prohibited their distribution, or it might have been an oversight. I'll get back to you!
Edited to add: Unfortunately, the heat pump models we have in house that model defrost cycles are not developed enough yet for commercial distribution; they also rely on performance data that isn't typically available from manufacturers. I wish I could help further!
TS_Team 13/06/2023 8:09 am
@janboettner You may have a look at Type 402
Compressor Heat Pump Including Modulation, and
Frost and Cycle Losses ( https://trnsys.org/community/component-libraries-tess-libraries-transsolar-components-user-written-components/heat-pump-defrost-cycle/). best, marion
Type 372 is a physical model, that describes the cyclic process of a heat pump in a stationary mode. As opposed to that, Type 402 is a model that uses performance data of an actual heat pump to describe the heating/ compressor power based on polynoms (depending on the temperatures and operation point). You can find the documentation of both types on our website at https://trnsys.de/en/addons-en (by clicking on the type's graphics). As was mentioned before, this model also considers warming up/ cooling down periods and defrosting.
Best, Christina
Hi,
Is it also possible to use type 402 as a fixed heat pump? There is not a lot information available on this type, the parameters and how it works...
Thank you in advance.
