• 대한설비공학회지:설비저널
• /
• 제30권11호
• /
• pp.28-35
• /
• 2001

• 대한설비공학회지:설비저널
• /
• 제18권5호
• /
• pp.463-481
• /
• 1989

• 대한설비공학회지:설비저널
• /
• 제18권6호
• /
• pp.532-543
• /
• 1989

• 대한설비공학회지:설비저널
• /
• 제18권6호
• /
• pp.498-506
• /
• 1989

• 대한설비공학회지:설비저널
• /
• 제19권4호
• /
• pp.225-232
• /
• 1990

• 대한설비공학회지:설비저널
• /
• 제19권6호
• /
• pp.331-336
• /
• 1990

• 대한설비공학회지:설비저널
• /
• 제1권2호
• /
• pp.46-53
• /
• 1972

• 대한설비공학회지:설비저널
• /
• 제40권3호
• /
• pp.41-46
• /
• 2011

• 대한설비공학회지:설비저널
• /
• 제18권4호
• /
• pp.303-318
• /
• 1989

• International Journal of Air-Conditioning and Refrigeration
• /
• 제7권
• /
• pp.91-100
• /
• 1999

This paper investigates ventilation characteristics of an environmental chamber simulating an under-floor air conditioning system for isothermal and cooling supply air conditions. The tracer gas sulfur-hexafluoride (SF$F_6$) was injected into a supply duct using step-up and step-down methods. Local mean and room mean ages were calculated from the concentrations measured at internal points and at the exhaust duct. The air change efficiency of the chamber has been found to be greater in cooling conditions than in isothermal conditions. Also the room air change efficiency is not significantly affected but slightly improved by the presence of a supply diffuser.