Experimental research on reducing top concentrated air supply ceiling area in model hematology ward: Part 3 of the series of research practice of national standard Technical code on clean nursing and

 Performs an experiment in a model hematology ward with an area of 9 m2 and a height of 2.5 m. The results show that the cleanliness can be reached class-5 (indoor particle concentration much lower than 3.5 particles/L) when each side of top concentrated air supply ceiling is 0.4 m longer than the bedside. Meanwhile, the air velocity at 0.4 m height of bed head is lower than 0.1 m/s, which is far below blowing feeling velocity of 0.12 m/s. In addition, this air supply model can save 1/3 to 2/3 energy than regular project.