BAROMETRIC PRESSURE : 29.921 INCHES OF MERCURY
PSYCHROMETRIC CHARTNORMAL TEMPERATUREI-P Units
SEA LEVEL
-30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140 145 150 155 160
DRY BULB TEMPERATURE - °F
-5 0 5 10 15 20 25 30 35 40
45
50
55
60
65
70
75
75
80
80
85
85
EN
THA
LPY
- B
TU P
ER
PO
UN
D O
F D
RY
AIR
-5
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
ENTH
ALPY
- BT
U PE
R PO
UND
OF
DRY
AIR
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0.55
0.60
0.65
0.70
0.75
0.80
0.85
0.90
0.95
1.00
1.05
1.10
1.15
1.20
1.25
1.30
1.35
1.40
1.45
1.50
1.55
1.60
1.65
1.70
1.75
1.80
1.85
1.90
VA
PO
R P
RE
SS
UR
E -
INC
HE
S O
F M
ER
CU
RY
0 10 20 25 30 35
40
45
50
55
60
65
70
75
80
85
90
95
DE
W P
OIN
T TE
MP
ER
ATU
RE
- °F
Chart by: HANDS DOWN SOFTWARE, www.handsdownsoftware.com
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.400.350.300.250.20
SENSIBLE HEAT RATIO = Qs / Qt
SE
NS
IBLE
HE
AT
RA
TIO
= Q
s / Q
t
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
260
270
280
290
15%
25%
2%
4%
6%
8% RELATIVE HUMIDITY
10% RELATIVE HUMIDITY20%
30%
40%
50%
60%
70%
80%
90%
-25 -20 -15 -10 -5 0 0 5
5 1010 15
15 2020 25
25 30
30 35
35 40
40 45
45 50
50 55
55 60
6065
6570
70
75
75
80
80
85
85
90
90
95 WET BULB TEMPERATURE - °F
95
100
12.0
13.0
14.0
15.0 VOLU
ME- C
U.FT. PER
LB. DR
Y AIR
16.0
HU
MID
ITY
RA
TIO
- G
RA
INS
OF
MO
ISTU
RE
PE
R P
OU
ND
OF
DR
Y A
IR
0
1.0 1.0
-
2.04.08.0-8.0-4.0-2.0-1.0-0.5
-0.4-0.3-0.2-0.1
0.10.20.
3
0.4
0.50.6
0.8
-2000-1000
0
500
1000
1500
2000
3000
5000
-
SENSIBLE HEAT QsTOTAL HEAT Qt
ENTHALPYHUMIDITY RATIO
hW
BAROMETRIC PRESSURE : 29.921 INCHES OF MERCURY
PSYCHROMETRIC CHARTNORMAL TEMPERATUREI-P Units
SEA LEVEL
Chart by: HANDS DOWN SOFTWARE, www.handsdownsoftware.com
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