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Re: [EnergyPlus_Support] "design day" simulation

Yunjie:

If you plot the zone temperatures, you will probably find that in the case with cooling OFF at night, the zone temperatures rise higher.  In this case, when the equipment comes on and tries to meet the set point at 8am, there is a large 'pick-up' load that must be met to quickly bring the temperature down.  This initial variation can cause variations throughout the day in the load.  Try plotting zone air temperatures and see if the results are coming out acceptable.

Edwin

On Wed, Dec 17, 2008 at 4:18 AM, Yunjie Liu <liuyun22@xxxxxxxxx> wrote:

Dear all:
I am trying to simulate the building load for the design day, and I simulated 2 times, one is cooling for the whole day, while another is cooling from 8:00 to 20:00. Two questions surprised me, first why the load is different from 8:00 to 20:00 for the two, second why the load at the beginning is larger than other time for the latter. I attached a picture for my questions.
Many thanks if any one can help! 
 
Yunjie


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