Next generation HVAC system

The new HVAC (Heating, Ventilation and Air Conditioning) system for buildings is proposed. The key technology for the system is twin coil air handling unit (AHU) and its advanced control method. One coil is equipped to cool and to dehumidify the fresh air intake, and the other coil is for cooling circulated air. The deeply chilled water is necessary only for remove the moisture from the fresh air. The latter coil requires moderately cool water according to the HVAC load. Then 2 kinds of chilled water in terms of temperature should be prepared. The structure help saving the energy consumption for air-conditioning because the higher chilled water temperature means the better chiller efficiency (COP). Next, the advanced control method that is called ‘Air-Water cooperation system’ is introduced. The control system mainly focused on energy savings through changing the temperature of chilled water and supply air according to the HVAC load and weather conditions. In the paper, we introduce Next generation HVAC system with its control system and evaluation results of the system for the model-building simulator.