The Office Air Handling Unit versus the Two Dedicated Air Handling Unit System

Both analytical and the numerical methods have been developed to compares the energy performance of the OAHU systems and the two-AHU (TAHU) system. The OAHU system saves up to 1.85 kilojoules heating energy for each kilogram air supplied to the building, or 0.8 Btu for each pound air supplied to the building when the outside air dew point temperature is less than the room dew point temperature. When the outside air dew point temperature is higher than the room dew point temperature, the OAHU system saves up to 4.65 kilojoules heating and cooling energy for each kilogram air supplied to the building, or 2 Btu for each pound air supplied to the building. Both OAHU and TAHU consume the same amount of fan energy. The paper presents the system models, the simulation procedures and the simulation results