12 TRG-TRC001-EN
notes
period one
The Psychrometric Chart

Additional curves can be added to the chart to represent relative humidity

conditions that are less than 100%. The curves shown are at 10% intervals and

represent humidity conditions ranging from completely saturated air to

completely dry air. When air is completely dry, its relative humidity cannot

change with temperature. The 0% condition is therefore represented by the

horizontal axis of the chart.

This basic chart now shows three air conditions: dry-bulb temperature (vertical

lines), humidity ratio (horizontal lines) and relative humidity (diagonally curved

lines).

5HODWLYH+XPLGLW\&XUYHV
UHODWLYHKXPLGLW\
UHODWLYHKXPLGLW\



'U\%XOE7HPSHUDWXUH)
'U\%XOE7HPSHUDWXUH)
+XPLGLW\5DWLRJUDLQV
+XPLGLW\5DWLRJUDLQVOE
OERIGU\DLU
RIGU\DLU
                












Figure20

3URSHUWLHVRI$LU
KXPLGLW\UDWLR
KXPLGLW\UDWLR
GU\EXOE
GU\EXOE
UHODWLYHKXPLGLW\
UHODWLYHKXPLGLW\

'U\%XOE7HPSHUDWXUH)
'U\%XOE7HPSHUDWXUH)
+XPLGLW\5DWLRJUDLQV
+XPLGLW\5DWLRJUDLQVOE
OERIGU\DLU
RIGU\DLU
                












Figure21