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

My question is: during the simulation, I very frequently get the error shown in the attached picture. Does anyone know why this error appears?

Thank you very much

I am using TRNSYS 18 and I am currently following the manual tutorial, specifically Tutorial 9, Section 9.2: “Creating a Simple TRNSYS Project.”

I have followed the instructions carefully step by step, but at the end of the tutorial I am getting results that are different from the results shown in the manual. I have repeated the tutorial twice now, and I am still getting the same incorrect/different results.

I have attached screenshots of the results I am getting, along with my project/input files, so that you can see what I have done.

Could someone please help me check what I might be doing wrong? I would really appreciate any guidance, especially on whether my component connections, parameters, or output setup are incorrect.

Thank you very much

I found a TESS data file for Yazaki Single Effect absorption chiller name Yazaki20-50ton(OneStage)S3.dat.

C:\TRNSYS18\Tess Models\SampleCatalogData\AbsorptionChiller\Single-Effect\Yazaki Model\Yazaki20-50ton(OneStage)S3.dat

I believe it is the hot water fired WFC-SC version 20, 30 and 50 tons.

The file includes 9 Hot water inlet temperatures + fraction of nominal capacity at these 9 HW inlet temperatures.

However I am wondering how to use the file since TYPE107 asks for a more detailed file including:

- Number of CW steps in data file

- Number of CHW setpoints in data file

Best regards,

To ensure comparability, I have configured both models as similarly as possible:

Type 557:

• Number of Boreholes in Series: 1
• Number of Radial Regions: 1

Type 548:

• Number of Fluid Inlets: 1
• Number of Radial Regions: 1
• Inlet to Radial Region: 0

All other parameters as well as the system connections are identical in both cases.

However, I am observing a discrepancy:

• In Type 557, the thermal energy balance closes correctly.
• In Type 548, the thermal balance does not match.

Has anyone experienced similar inconsistencies between these two Types, or could there be something subtle in the configuration of Type 548 that I might be overlooking?

Any insights would be greatly appreciated.

I am using Type786 and I set Control Mode = 0 (Parameter #1) to operate the heat pump as an ON/OFF unit. However, when I run the simulation, I receive the following error message:

"14 INPUTS are required and 16 INPUTS were specified."

I understand the reason: when Control Mode = 0, Input #15 (heating mode supply air temperature setpoint) and Input #16 (cooling mode supply air temperature setpoint) are not needed. These two inputs are only relevant when Control Mode = 1 (variable speed operation). 

My question is: is there a way to disable or deactivate Input #15 and Input #16 when Control Mode = 0, without having to modify the source code or the ProForma file? I am looking for a standard, user-level solution.

What do you recommend?

1. Use only the cooling rating flow rate (1160 CFM) for both modes (single step each)?

2. Copy the single heating flow rate 4 times to match the 4 cooling steps?

Thanks.

I would like to model a heating circuit in a building, with a single-speed pump (type 114) and a valve that is connected to a PID-controller. The valve should modulate the flow rate in the circuit, based on the control signal from the PID-controller. What is the easiest way to model this? I have not found a valve type appropriate for this purpose. Is it best to use a valve+single-speed pump, or is it easier to use a variable-speed pump instead? If I use the single-speed pump, will the flow rate be affected by a valve, or will it always keep the same, constant flow rate?

Best regards,

Johan