CIBSE Loads - Fifty Iterations - temperatures not balanced

ApacheCalc – Heat loss/gain calculations using CIBSE procedures to determine design heating/cooling loads.
ApacheLoads – Design heating/cooling loads calculations using ASHRAE Heat Balance Method.
bootsam
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CIBSE Loads - Fifty Iterations - temperatures not balanced

Postby bootsam » Wed Apr 09, 2014 4:09 pm

Anyone have any ideas what this means?

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Complex Potential
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Re: CIBSE Loads - Fifty Iterations - temperatures not balanc

Postby Complex Potential » Wed Apr 09, 2014 4:29 pm

If it's on CIBSE Cooling then it probably means there's a room somewhere with extremely high temperatures or some other instability which is preventing the engine from converging on a solution.

Check your templates to see if you have a gain input incorrectly (having W/m2 instead of W is a classic). Otherwise, look carefully at your model geometry. Is there a small and highly glazed perimeter zone somewhere with no ventilation or cooling perhaps?

bootsam
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Re: CIBSE Loads - Fifty Iterations - temperatures not balanc

Postby bootsam » Thu Apr 10, 2014 8:29 am

Thanks CP.

Found it. Sneaky little small room (cup'd) which had accidentally been given full office loads in watts. So I had basically turned it into an oven. Good job the occupancy was zero.

God bless tabular data.

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Re: CIBSE Loads - Fifty Iterations - temperatures not balanc

Postby mike_6690 » Tue Nov 25, 2014 10:56 am

I have the same issue with the fifty iterations - temperatures not balanced, however this is happening on both CIBSE heating and cooling load calcs.I also have checked and do not have any excessive internal gains applied.
Any ideas would be great?

Thanks


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