Hourly Analysis Program (HAP) is an energy simulation methodology and software approach that calculates building energy consumption at hourly time intervals rather than monthly aggregations, enabling detailed modeling of dynamic HVAC system responses and load variations. Hourly analysis captures diurnal temperature swings, occupancy patterns, and equipment cycling that monthly averages cannot represent. This granularity is essential for accurate central plant modeling and controls strategy evaluation.
Technical Advantages
Hourly simulation resolves 8,760 data points annually, compared to 12 monthly values, enabling precise calculation of equipment part-load performance, demand charge impacts, and thermal lag effects. The methodology accommodates variable occupancy schedules, demand-controlled ventilation responses, and time-of-use energy pricing structures. Hourly analysis reveals peak demand profiles that monthly methods obscure, informing chiller sizing and demand response strategies.
Engineering Applications
Mechanical engineers use hourly analysis to evaluate central plant configurations, thermal storage effectiveness, and demand-limiting control strategies. The approach supports energy code compliance by demonstrating that proposed HVAC systems meet efficiency targets across diverse weather conditions and operational scenarios. Hourly results inform utility rate studies and identify opportunities for demand response and energy management optimization.