Simulation And Optimized Control For Central Air-Conditioning System With Pure-air Terminals

At present energy conservation and indoor environment quality concerns have motivated extensive research on various aspects of the control of Heating Ventilating and Air-Conditioning (HVAC) and building systems. The simulation of the air-conditioning system and the optimized control of minimizing the energy consumption under the constraint of temperature were mainly studied in this paper.Firstly, the simulation software HVACSIM+ for air-conditioning systems and its main models are introduced. The air handling unit and the rooms of the first floor of Jinye Building are taken as the simulation target;a simulation system was set up based on the platform of HVACSIM+. This system can simulate the performance and the control characteristics of the air-conditioning control system. It provides the foundation for the deep research on air-conditioning control system and its optimization. Then the function describing the relation between the consumption of cooling coil and the chilled water velocity was found and taken as the objective function, and with improved cyclic variable method the controller's parameters were optimized under the MATLAB environment. Finally the HVACSIM+ simulator was run again to calculate the energy consumption supplied by the cooling resources to this air conditioning subsystem.Results show that the system runs steadily while the controller works with the optimal parameters and the energy consumption of the cooling coil is greatly reduced compared with working in non-optimizing condition.