Study On Simulation And Control Methods Of Capillary Radiation Air-conditioning System With Displacement Ventilation

This thesis introduced the theory and characteristic of capillary radiation air-conditioning system with displacement ventilation, and give a method to measure thermal comfort index of it.Test of the villa, installed capillary radiation and displacement ventilation air conditioning system on summer condition. The results show that the temperature field and speed field of room was very uniformity, and more comfortable than traditional air conditioning system. Test energy consumption of the villa. The result show that the capillary radiation system takes less than half of total cooling load. The air conditioning system of the villa may reduce its energy consumption. Analyzed some troubles of the system.Simulate temperature field and speed field of test room by FLUENT. The results show, temperature field and speed field of room without hot source was uniformity and mainly influenced by heat flux from out walls and windows. Simulate two kinds of displacement ventilation.result show horizontal ventilation is better than vertical ventilation. When there was horizontal displacement ventilation, the airflow felled to the floor and flow close to floor, except at the neighborhood of heat source.The control methods of temperature and humidity independent air-conditioning system was researched. Energy consumption of air conditioning system can be saved through intermittent flow control and room temperature compensation control. Condensation can be effectively prevented through indoor air dew point temperature feedback control and capillary radiation ceiling surface temperature control. The most energy-saving economic operation strategy of the villa air conditioning system was put forward. This system form was more energy conservation than some other system through theoretical calculation and analysis. Theory basis was also be provided for promotion in this thesis.