Question-and-Answer Resource for the Building Energy Modeling Community
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The Peak Design Sensible Load [W] comes from the heat balance algorithm, and the Estimated Instant + Delayed Sensible Load [W] comes from an estimation of contributions to the sensible load from the zone components load summary.
Read through the Zone Component Loads Summary section in the EnergyPlus Engineering reference to get more of an idea of how the software is calculating the component loads:
"The Estimated Cooling Peak Load Components and Estimated Heating Peak Load Components subtables of the Zone Component Loads Summary report contain values that are estimated and are not part of the normal heat balance algorithms used in the rest of EnergyPlus. In particular, the column described as Sensible-Delayed represents an estimate of the sensible load contributed at the peak time based on radiant contributions from various load components that have radiant portions in previous timesteps. The focus of this section will be on the Sensible-Delayed column."
