[TRNSYS-users] Causes of Pump mass balance warning?

[David Bradley]

Fred,
 Fundamentally, the only thing that can cause a pump mass imbalance is 
if it is not getting the same flow in as it is putting out. I'd 
recommend putting an online plot into your sim and plotting the flow 
rate coming out of every component in your closed loop. It should be 
pretty easy to spot where the flow is going.
Best,
David

Fred Betz wrote:
>
> I have two closed loop systems, one heating, one cooling and I am 
> getting several mass balance warnings.
>
>  
>
> What I am doing is using a proportional controller to control a 
> variable speed pump based on the return temperature of a load.
>
>  
>
> All the flow connections have been double checked.
>
>  
>
> Any thoughts on what might be causing this?
>
>  
>
> Fred
>
>  
>
> *Fred Betz**  *PhD., LEED AP
> Sustainable Systems Analyst
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>
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