Songban,also called Lei,xiao songban,or A ban song in Dong dialect,is one kind of Dong songs of the Northern regions.

Variable air volume control of terminals and air conditioning boxes for underfloor air supply systems;

Discussion on application of a combined chilled ceiling and underfloor air supply system in an office building;

Presents the characteristic of the swirling jet diffuser and its application in theunderfloor air supply system.

Comparison and analysis of cooling load calculation methods for underfloor air distribution system;

Application of underfloor air distribution to management and equipment rooms of underground railway stations;

Design and experimental study of underfloor air distribution with swirl diffusers for office buildings;

The paper reports the design principle of air-conditioning of the physical testing room, mainly discusses the lab s air-conditioning load analysis having temprature and moisture pricision requirements and low speed of working zone, air treatment process, air conditioner unit selection, system facilities automatic control and describes the design principle of perforated ceiling air supply.

Based on the indoor environmental measurements & questionnaires’ inquiry in the office with UFAD, compare and analyze the performances of the air distribution, thermal comfort, air quality, and environmental noise quality.

In the underfloor air distribution(UFAD) system,the indoor air stratification plays an important role for the accurate prediction of system energy consumption.

This thesis introduced the status quo, existent problems and tasks which still need to be studied in the domestic and international research on UFAD (underfloor air distribution system), expounded the principle and characteristic of UFAD.