The Research On The Properties Of Jets In Cold Air Distribution Systems

There are many problems for designing air distribution in the cold air distribution system. These problems are hot subjects researched by the HVAC experts worldwide. How to determine the jet separation point in the cold air distribution system? How to avoid the troubles for designing the system? How to select the terminal equipment for the system? This paper is focusing on discussing and resolving those problems.(1) This paper analyzes and studies on the jet separation point, which are based on the former research findings and in the end brings forward a equation for calculation the distance of the jet separation. These equations are testified by the laboratory experiment and engineering application. Furthermore, these equations can be applied in cold air distribution system as well as traditional systems.(2) Analyzing the distance of jets separation affects the indoor environment, and analyzing the factors affected the distance of jets separation. The paper brought forward some advises for avoiding the draft and condensation in the cold air distribution.(3) This paper also refers to the terminal equipments selection in the cold air distribution system, and brings forward some principles for selecting those equipments. This paper analyzes the feasibility for cold air distribution systems when applying with traditional inlets by means of no-dimension. Step by step, the author comes to the conclusion how the supply air temperature difference and the size of outlets affect the Archimedes number. Moreover, the paper also illustrates how to select outlets in the cold air distribution system through engineering examples.The paper makes active contribution to engineering application of the cold air distribution systems. The use of cold air distribution system should be expanded due to its great energy saving potential and social benefits.