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The Zone Component Load Summary is a calculation that is separate from the normal heat balance routine that is included in EnergyPlus and is an approximation of the possible component loads. Part of what occurs is to estimate the heat load through each surface of a zone. You should look at the individual surface results to understand the heat flows. Please also check the "Difference Between Peak and Estimated Sensible Load" to see how good the estimate is for that zone. I would recommend that you review the documentation for that report in the Engineering Reference PDF that is in the Documentation folder where you installed EnergyPlus.