The Tuyere Characteristics And Comfort Research Of Cold Air Distribution Air-Conditioning System

Cold air distribution system has obvious advantages of reduce system cost, lower floor height, reduce fan energy consumption compared to the conventional air conditioning system.However, when using low-temperature air supply system, due to the decrease of the blowing air temperature, the reduction of the air volume will cause a corresponding change of the entire air conditioning system of the processing apparatus; room and not prone to the "cold" dropping or "hot" floating workspace air mixing on human thermal comfort feeling extremely unfavorable. This prompted us to explore the distribution of air-conditioned room air distribution analysis meets human comfort requirements.Cold air distribution system design compared with conventional air conditioning systems are substantially the same, but the need to consider more problems due to the reduction of the supply air temperature. Cold air distribution system duct resistance of the duct cross-sectional area of the duct was heat and temperature rise, duct insulation requirements detailed comparative analysis, optimal design based on the cold air distribution design. Devices and choose to do a detailed introduction to the end of the cold air distribution, selection methods and principles of the device by the end of the cold air distribution system. And conventional outlet for cold air distribution system feasibility analysis.In this paper, as a cold air distribution office as the model, select a dedicated embedded low-temperature vents. The use of computational fluid dynamics(CFD)simulation of three typical supply air temperature(11℃,8℃,4℃)simulation room, its temperature field, velocity field were analyzed, and the main work area the analysis of the flow field. Analyzed11℃,8℃of the blowing airflow is satisfactory,4℃blowing room temperature significantly below the design temperature. The response to the air supply conditions or low temperature vent certain improvements in the use of ultra-low-temperature supply air temperature4℃blast.The blast angle of the room for airflow simulation appears cold sinking workspace flow field, using the same simulated room model of embedded special low-temperature air diffuser air supply angle researched, drawn28℃comfort. The use of the effective wind flu temperature(EDT)airflow simulation results of the simulation room three supply air temperature, air distribution performance index(ADPI)and PMV method of combining the thermal comfort of analysis. Provides a meaningful reference for the practical application of the cold air distribution system in the future, and contribute to the promotion and development of cold air distribution system.