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Re: [TRNSYS-users] TRNSYS16 / type 56 convergence problem with heat recovery ventilation

Christophe,

  I didn't look at the files. However, the two most common issues are 1. to make sure that you have accounted correctly for the zone thermal capacitance (the default value of the zone capacitance accounts only for the thermal capacitance of the air in the zone, not for any of the zone contents and furnishings). And 2. to make sure that you are using a short time step (no more than 5 minutes) so that the ERV can make control decisions on an appropriate time scale.

kind regards,

 David



On 06/08/2017 05:04, Christophe Plantier via TRNSYS-users wrote:

Dear TRNSYS Users,

I have a convergence problem in studio which I cannot solve. This warning occurs too many times : "TRNSYS Message    441 : The inputs to the listed units have not converged at this timestep. The values at the last iteration will be used and the simulation will proceed.  Reported information  : UNITS: 56  15".  I tried to delete all links with the BUI file and to recreate them one by one and the error occurs when I link the heat recovery ventilation. This a classic module that we use in my company and this is the first time we have such a problem.

Could anybody help me ? I join the required files to run the simulation.

Thanks
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Christophe PLANTIER

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David BRADLEY
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Thermal Energy Systems Specialists, LLC
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