I am using E+ version 8.1. From the html report I observe that the plug load density for the core bottom zone is being considered as the sum of its surrounding perimeter zones plug load densities. This is further confirmed by observing the internal convective heat gain rate, heat added to air by internal loads, which is too high for the bottom core zone than similar mid/top floor's core zones.
I have also checked the surface convection rate for the core zones, for the bottom floor this is low as compared to mid/top floors core zones. So the surfaces for the bottom floor core zone are not the reason for its high heat gain .
Please let me know how this error can be removed.