Study On Dynamic Energy Analysis Of The Combined Cooling Ceiling And Displacement Ventilation System

Recently, building energy consumption and indoor air quality problems have been catching more and more people's attention. Due to the advantages in thermal comfort, indoor air quality and energy saving, the combined cooling ceiling and displacement ventilation system has been applied in some intelligent buildings in our country. Many studies abroad show that the combined system has great energy saving potential, but the application of the combined system in our country still needs to be carefully studied because of the difference between our country and abroad, such as climates, building type, system design, and so on.At first, this thesis simulates the combined cooling ceiling and displacement ventilation system in an intelligent building hourly by using EnergyPlus software, and verifies the simulation results with actual operating parameter values. Then, simulates the energy use of several regular air-conditioning systems separately, compares the simulations results of these systems and analyzes the energy saving potential of the combined cooling ceiling and displacement ventilation system.On the basis of simulation, this thesis analyzes several influence factors of the energy consumption of the combined system under our country's climate, such as chilled water supply type, using free cooling by cooling tower, night cooling, heat and cooling source, and so on. The results show that the energy saving potential of the combined system is influenced by many factors, it is suggested that choosing proper system and heat and cooling source under different climate to save as much energy as possible.