A versatile system design tool and an energy simulation tool in one package, Carrier’s Hourly Analysis Program (HAP) provides the ease of use of a Windows-based graphical user interface and the computing power of modern 32-bit software.

HAP’s design module uses a system-based approach to HVAC load estimating. This approach tailors sizing procedures and results to the specific type of system being considered. Central AHUs, packaged rooftop units, split systems, fan coils, water source heat pumps and PTACs can easily be sized, as can CAV, VAV and multiple-zone systems. Calculation rigor and integrity are provided by the ASHRAE Transfer Function Method for calculating building heat flow.

HAP’s energy analysis module performs an hour-by-hour simulation of building loads and equipment operation for all 8,760 hours in a year. This approach provides superior accuracy versus the reduced hour-by-hour method used by other software programs on the market. This is because a full hour-by-hour calculation considers the unique weather and operating schedules for each day of the year, rather than looking only at average or typical days each month. Such accuracy is crucial when analyzing design alternatives, energy conservation methods and details of off-design and part-load performance for equipment. HAP uses TMY weather and the ASHRAE Transfer Function to calculate dynamic heat flow. Many types of air handling systems, packaged equipment and central plant equipment can be simulated.