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Re: [TRNSYS-users] Trnsys message 441

Ali,

 If you are only getting one or two non convergence warnings throughout the simulation then I would not worry about them. If you are getting a lot of them then you probably need to shorten your time step (1-5 minutes is appropriate) and add thermal capacitance to the loops. Types1, 5, and 114 are all quasi steady state models and so react instantaneously to controls and weather changes. Try adding pipes to the loop and make sure that their volume is greater than the volume that the pump can transfer in one timestep.

kind regards,

 David


On 06/06/2021 16:46, Ali Shahrouzian via TRNSYS-users wrote:

Dear all

 

Hi,

 

I’m modelling a solar system for water heating applications. I’ve used a type 1b(solar collector), a type 5b (HX) and a type 114 (pump) and connected them as a closed loop. When I run a simulation, it gives: TRNSYS Message 441 (The inputs to the listed units have not converged at this time step. The values at the last iteration will be used and the simulation will proceed).

When I decrease the pump flowrate (for example around 50 kg/hr), it works. However, it has another issue: the outlet temperature from heat exchanger equals to the heat exchanger inlet temperature!!!

 

I would appreciate if someone guide me in that case

 

Ali

 


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David BRADLEY
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Thermal Energy Systems Specialists, LLC
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