Type525 is intended to somewhat control itself. You give it an intended outlet liquid temperature and it will adjust the compressor speed internally to meet that temperature if it can. It does also have an on/off switch if you want it to be totally inactive at times.

  I think the more challenging part of what you're doing is that Type525 (all the TRNSYS heat pumps I am aware of, in fact) are written in such a way that you tell them how much thermal energy you need and they tell you how much power it takes to produce that thermal energy. In your case you know how much extra power you have available and you want to know how much thermal energy you can add to or remove from the system as a result of using that power. What's more the heat pump models don't usually take load directly as an input; they take inlet condition and desired outlet condition.

 One thing that I have begun doing is to use instances of the HVAC equipment in my system to determine the maximum amount of energy that the equipment can add/remove. I then compare that amount of energy to the amount that is truly needed and then run the actual equipment accordingly. The idea is to use one instance of the model as a kind of controller for the other. In your case perhaps there is a way to implement an instance of Type525 to determine how much electrical power would be needed at any given time to add energy to the PCM tank. You could then compare that amount of power to the surplus power from the PV and turn on a second instance of Type525 (the actual one as opposed to the virtual controller one) accordingly.

~david      

  It should not be too difficult to move back and forth between data files for non-normalized models (Type107) and normalized models (such as the TESS Library versions). The TESS models take nominal capacity as a parameter; the actual capacity comes simply from multiplying that parameter by the values in the data files. If you do this, please refer to the documentation either in .\TrnsysXX\Documentation\ or in ..\TrnsysXX\TESS Models\Documentation as there are some subtle differences between various capacities (for example rated vs nominal).

  I would not recommend mixing files from different sources. Absorption chiller performance varies quite a lot across machine rated capacity and from one manufacturer to the next.

  Ideally the best solution would be to identify a real-world machine that meets your requirements and then to talk to a manufacturer’s representative about how to get some performance data points for enough combinations of entering conditions that you might be able to assemble the data files that are needed. Often manufacturers have software tools that allows them to generate performance points.

  I did have a look around online and found the following:

  https://www.yazakienergy.com/waterfiredperformance.htm

I did not look at it too carefully, but it looks as though it may have the kind of information that is needed in order to generate performance map files and their plots seem to go as low as 71C.

~david

I would like to share a tool that may be interesting for TRNSYS users who need to create detailed multi-zone building models.

IZUBA, the French distributor and support team for TRNSYS, has developed a gateway between Pleiades Modeleur and TRNBuild.

This can be particularly useful for users working with multi-zone buildings. In Pleiades Modeleur, zones can be created with a single click, and the contacts between adjacent zones are automatically detected. There is no need to manually define the connections between zones, which can significantly simplify the modeling process and reduce the risk of errors 😎 .

Another advantage is the easy definition of solar shading and surrounding obstacles. The building environment can be imported directly into Pleiades Modeleur, making it much easier to model neighboring buildings that  affect solar gains . And also the possibility to define and export different schedules, such as occupancy, ventilation, heating and cooling.

Documentation and examples:

TRNSYS FAQ:
https://pleiades-doc.com/v4/fr/index.php/FAQ_TrnSys

Pleiades modeler → TRNBuild documentation:
https://pleiades-doc.com/v4/fr/index.php/Exporter_vers_Editeur_(Modeleur)?toc-id=404#Export_TRNSYS_.28Version_Alpha.29

If, in addition to your passion for thermal simulation, you also have a enthusiasm for teaching (though in German) and hold a PhD, then a position as a professor at the Technical University of Applied Sciences Cologne (TH Köln) with a focus on thermal simulation might be of interest to you.

https://www.linkedin.com/feed/update/urn:li:share:7480219408578207744/

https://karriere.th-koeln.de/job/view/1566/professur-fuer-thermische-energ

If you are interested, don't hesitate, to contact me.

I have carefully searched for more instructions on how to set up the control signals for the heat pump Type 525. However, I have not found any relevant information. If you have set up the control for this type of heat pump, could you please provide me with some guidance? Alternatively, if there is already a post about this, please let me know, as I was unable to find it.

In my case, I am trying to use the PV surplus instead of an electrical battery. I am using a heat pump to charge a PCM tank. Since Type 941 has a fixed-speed compressor, it will only run when the PV surplus is much higher than its rated power.

I have tried splitting my Type 941 heat pump into two units, and I was able to improve the results by operating a smaller-capacity unit when the PV surplus is lower. This made me think that using the variable-speed compressor Type 525 could be a better solution for maximizing heat storage based on the available PV surplus, as I could better adjust the heat pump's operation according to the available surplus.

The annual data I have consist of the building's heating and cooling loads in kW, and I am using Type 682 to simulate the building. Therefore, I am not using Type 56.

If there is any other information you need in order to help me, please feel free to ask.

Thank you.

Humberto