Re: [EnergyPlus_Support] Warning

[Linda Lawrie <linda@xxxxxxxxxx>]

At 10:19 AM 12/4/2002, Cristina Castaño/LABEIN wrote:

What is the meaning of the following error?, What is wrong?:

** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC loops,
SANTANDER ESP IWEC DATA WMO#=080230, 01/01 01:15

The EnergyPlus System and Plant Simulation is solved by iteration, together with the information from the Loads calculations. SimHVAC is a routine that calls all of the System and Plant managers and is controlled by a set of convergence flags from these managers. When there has been greater than 20 iterations through all of the managers without convergence by all of the loops and components than this error message is printed out with the name of the current environment that it was simulating. There is also a report variable "HVACManage Iterations" that can be turned on to retrieve the number of iterations that any HVAC timestep took to reach convergence. When this warning happens occasionally it may not be a problem if a few time steps miss convergence. This can happen in a variable volume system that is bouncing around at a setpoint and just can't quite meet the convergence criteria as everything else is changing slightly around it. The other extreme is this warning happens at every timestep and is an indicator that something is not hooked up correctly or misconfigured/specified.

Linda

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