ASHRAE PSYCHROMETRIC CHART NO.

1
55 60
NORMAL TEMPERATURE
R
BAROMETRIC PRESSURE: 29.921 INCHES OF MERCURY R

Copyright 1992 90

AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING ENGINEERS, INC. 50 .028

SEA LEVEL
60

: 1.0 1.0 -: 85

15.0
5000 0.8 .026
2.0 -2000
3000 0.6 SENSIBLE HEAT Qs 4.0 -1000
-8.0 45
TOTAL HEAT Qt -8.0:
0.5 -4.0 85
-2.0 0 WET .024
0 .4 BU
-1
200
0 .0 LB
TEM 55
PE
0 .3

RA
-0.5

80 TU
-0.4

50
-0.3

0 RE
0.2

-0.2

- °F
-0.1

0 40 .022
0.1
15
00

80
1000

.020
ENTHALPY Dh
HUMIDITY RATIO DW 75
35 50

14.5
.018

75
R
AI
Y

F
R

-°

70 .016
D

E
F

30
R
O

U
D

AT
N
U

R
PO

PE
M
R

45
TE
PE

70 .014
N
TU

65
I
-B

AT

HUMIDITY RATIO - POUNDS MOISTURE PER POUND DRY AIR

R
PY

TU
AL

25
SA
TH

.012
EN

65
14.0

60 %
90
VO
LU

.010
ME

%
20 80 60 40
-C

55
U.F

0%
T. P

7
.008
E

50 55
RL

%
60
B. D
13.5

RY

45 50
DRY BULB TEMPERATURE - °F

15
50%
AIR

.006
40 45 35
40%
35
40
.004
30%
13.0

35

20%
.002
12.5

E HUMIDITY
10% RELATIV
30
100

105

110

115

120
35

40

45

50

55

60

65

70

75

80

85

90

95

10 15 20 25

ENTHALPY - BTU PER POUND OF DRY AIR

 ASHRAE PSYCHROMETRIC CHART NO.1
110 120
NORMAL TEMPERATURE
.030
R
BAROMETRIC PRESSURE: 101.325 kPa R

Copyright 1992 100

.029

AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING ENGINEERS, INC.

.028

SEA LEVEL 30

0.9
.027
: 1.0 1.0 -:

4
120
0.8 1.5 .026
10.0
0.7 2.0 -5.0 90
0.6 SENSIBLE HEAT Qs 4.0 -2.0 30
WE .025
TOTAL HEAT Qt - TB
0.5 : UL
-4.0 BT
5.0 -2.0 0.0 EM .024
0 .4 PE
-1
.0
RA
80 TU
RE .023
0 .3

1 .0 - °C 110
-0.5

4 .0
0.2

-0.2

0 .022
0.1

0.9
2
.021
3.0

2.0

70 25
2.5

.020
ENTHALPY Dh
HUMIDITY RATIO DW .019 100
25
60 .018
R

.017
AI

0.9
Y
DR

0
C
-°
F

.016
O

R E
M

TU
RA

50
RA

.015
G

20 90
LO

PE
KI

HUMIDITY RATIO - KILOGRAMS MOISTURE PER KILOGRAM DRY AIR

M
TE
R

.014
PE

N
IO
J
-K

AT

20
UR
PY

.013
0.8
AL

40
SA
TH

8
EN

.012

% 80
15 90 .011

30 % .010
80
15
0.8

.009
6V

7 0%
OL

.008
UM

10
%
E-

20 60 70
.007
CU
0.8

10
DRY BULB TEMPERATURE - °C
BIC

%
50
4

.006
ME

5
TE

.005
40%
RP

5
0.8

10
ER

.004
2

KG

30%
60
DR

.003
0.8

YA

20%
0

IR

.002
0.7

E HUMIDITY
10% RELATIV
8

.001
10

15

20

25

30

35

40

45

50
5

10 20 30 40 50
ENTHALPY - KJ PER KILOGRAM OF DRY AIR