Component Libraries (TESS Libraries, Transsolar Components, User-Written Components) - TRNSYS Forum

Run time error '339': Component 'COMDLG32.OCX' or one of its dependencies not correctly registered" a file is missing or invalid.

saeidbina — Wed, 20 May 2026 06:27:15 +0000

I had this problem before and I received a file and a command to write in the CMD, and at that time solved. But in my new PC, this does not work

Error message in Type1287

Antonio — Thu, 07 May 2026 10:55:17 +0000

Hello. I am simulating a solar PTC field with Type1287. I use Input 6 (Collector Outlet Temperature Control) set to 1 in order to vary the flow rate and maintain a fixed outlet temperature.

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

Screenshot-2026-05-07-123704.png

Yazaki Absorption Chiller TESS

karaktus — Tue, 28 Apr 2026 13:21:45 +0000

Dear Community,

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,

Discrepancy in results between Type 557 and Type 548

Antonio — Mon, 20 Apr 2026 21:18:15 +0000

I am currently simulating the same borehole field using two different TRNSYS Types (Type 557 and Type 548) in a system, with the goal of verifying whether both provide consistent results under equivalent conditions.

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.

Screenshot-2026-04-20-231421.png

Type786

yalikara — Fri, 17 Apr 2026 19:55:30 +0000

Hello,

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.

Modeling a two-way valve

jolind — Thu, 09 Apr 2026 12:13:01 +0000

Hi,

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

Fortran Compiler

Papillon — Tue, 31 Mar 2026 16:33:12 +0000

Dear TRNSYS users,

I was using Intel Fortran (Ifort 2022) with Visual Studio 2019 for developing and debugging Types, and everything was fine. But I changed my computer and this solution is no longer available.

As far as I know, there is no debugging options with Type Studio, and TRNSYS 18 is not compatible with the new Intel Fortran compiler (Ifx).

What is now the best solution to debug user written types ?

Regards

Philippe

Choice of type when modeling hydronic radiators

jolind — Wed, 18 Mar 2026 15:32:15 +0000

Hi,

I would like to model a hydronic radiator, to be used together with type 56. I have found type 1231 in the TESS library, but I have also read about type 362, but I can´t find the latter in the library. Is it appropriate to use type 1231, or if type 362 is better, where do I find it? I can´t find any radiator types in the standard library...

Best regards, Johan

Type 88 connection with equation editor issue

Quentin_Courjeau — Tue, 10 Feb 2026 19:03:42 +0000

For a simple thermal modelisation of a machinery room ventilation I used the Type 88.

I connect as input an equation editor with Type 88 to handle the sensible heat loads.

Unfortunately, those are not assumed by the model - ie Type 88.

When I fill directly the heat loads in type 88 they are properly considered in the model.

When I try to interconnect equation editpr with a type 57 for example, in order make a link with the type 88, the heat loads are neither assumed.

Just to complete the message, I use a, equation editor, because I need to add several inputs from a type 9c

Does anyone face to the same issue ?

Thanks to the community.

Regards

Q.Courjeau

Viscosity in pumps

ShamsoddinGhiami — Mon, 26 Jan 2026 13:15:04 +0000

Hi,
I am considering a pump component that accounts for the effect of inlet fluid viscosity on the required pumping power. Is there an existing component in TRNSYS or the TESS libraries that models this behaviour?