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[EnergyPlus_Support] 3rdOrderBackwardDifference in Energy Plus



Hi, All,
In the Engineering Manual of Energy Plus, it mentions a method of "3rdOrderBackwardDifference". 

It says "This algorithm requires zone air temperatures at three previous time steps and uses constant temperature coefficients. The assumption is that three previous time steps lengths are the same."  

I would like to know in terms of its inner calculation mechanism, how energy plus acquires the zone air temperature at three previous time steps? 

Thanks!
Na 



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