Planning and Design of a Full-Outer-Air-Intake Natural Air-Conditioning System for Medical Negative Pressure Isolation Wards

Table 7

Performance and function comparison of the proposed full-outer-air-intake negative pressure ward and that of traditional technology.

Item	Proposed full-outer-air-intake negative pressure ward	Traditional negative pressure ward
Introduce fresh outer air	Yes	No
Air cross-contamination	No	Yes
CO2 concentration control	Yes	No
Exhaust air volume control	Yes	No
Sensible heat exchange efficiency (ηs)	105.88%	No
Air change rate (N)	Max. 54.4 times; Min. 40 times	≧12 times