Ashrae Chart

10 15 20 25

30

35

40

45

50

55

55

60

60

ENTHALPY - BTU PER POUND OF DRY AIR

15

20

25

30

35

40

45

50

ENTH

ALPY

- BTU

PER

POUN

D OF

DRY

AIR

SATU

RATIO

N TE

MPER

ATUR

E - F

35 40 45 50 55 60 65 70 75 80 85 90 95 100

105

110

115

120

DR

Y B

UL

B T

EM

PE

RA

TU

RE

-

F

.002

.004

.006

.008

.010

.012

.014

.016

.018

.020

.022

.024

.026

.028

10% RELATIVE HUMIDITY

20%

30%

40%

50%

60%

70%

80%

90%

35

3540

40 45

45 50

50 55

55 60

6065

65

70

70

75

75

80

80

85 WET BULB TEMPERATURE - F

85

90

12.5

13.0

13.5

14.0 VOLU

ME- C

U.FT. PER

LB. DR

Y AIR

14.5

15.0

HU

MID

ITY

RA

TIO

- P

OU

ND

S M

OIS

TU

RE

PE

R P

OU

ND

DR

Y A

IR

Return Air

Outside Air

Mixed Air

Discharge Air

Return Air

R R

ASHRAE PSYCHROMETRIC CHART NO.1NORMAL TEMPERATURE

BAROMETRIC PRESSURE: 29.921 INCHES OF MERCURYCopyright 1992

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

SEA LEVEL

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

0.1

0.2

0.3

0.4

0.5

0.6

0.8-2000

-1000

0

500

1000

1500

2000

3000

5000

-

SENSIBLE HEAT QsTOTAL HEAT Qt

ENTHALPYHUMIDITY RATIO

hW