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Why do outcomes differ between EnergyPlus simulations and manual calculations, despite using identical inputs, including equipment wattage and fraction-based usage schedules?

Note: When the fraction is continuous (e.g., 1), manual and energyplus have the same outcome. I used the schedule: compact for the fractional usage of equipment per hour. I thoroughly checked the inputs for both approaches but there is still a slight difference in their outputs. I am still a student so I please help me. Thank you!

Why do outcomes differ between EnergyPlus simulations and manual calculations, despite using identical inputs, including equipment wattage and fraction-based usage schedules?

Note: When the fraction is continuous (e.g., 1), manual and energyplus have the same outcome. I used the schedule: compact for the fractional usage of equipment per hour. I thoroughly checked the inputs for both approaches but there is still a slight difference in their outputs. I am still a student so I please help me. Thank you!