Engmec

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55
0.25 0.30 SENSIBLE HEAT RATIO = Qs / Qt 0.35

50

90 200 190 85 85 0.40 1.30 1.25 1.20 1.15 170 1.10
55

14.6 SPE

14.8

180

15.0

re istu

45

CIF

mo

IC V

ociaBAROMETRIC PRESSURE: 29.914 in. HG
ir a

ted

OLU

14.4

0.45 1.05

ME

ass

°F

nd

UR E-

80

160 80 150 HUMIDITY RATIO (or Specific Humidity) GRAINS OF MOISTURE PER POUND OFDRY AIR 0.50

- Cu bic f

ry a

of d

PE

40

RA T

1.00 0.95 0.90 75
50

eet per

EM

lb.

UL BT

per

WE

lb. o

Btu

TB

14.2

TB

ULB

140

f dry

Y-WE

TH ALP

75

TEM

ENTHALPY - Btu per lb. of dry air and associated moisture

PER ATU

air

RE

0.55 0.85 0.60 0.80 0.75 0.70 0.65 0.60 0.55 0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.150.10 VAPOR PRESSURE - INCHES OF MERCURY

EN

- °F

130

35

120

70
30

DEW POINT TEMPERATURE - °F

14.0

90

110

%

70

0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 SENSIBLEHEAT RATIO = Qs / Qt

100

45

13.8

65
25
13.6

80

%

65

90
% 70

60
20

80

60
40

60
55

%
70

13.4
% 50

55

60

50
13.2

15

50 45

45
13.0

40%50

40
12.8

40

30%
30

40 35 30 20

35

35
10

30

32
12.6

20%
HUMIDITY
10 0 110

25

10% RELA

TIVE

25 20 10 0 115
30

0.05

20 30 40 50 60
STANDARD AIR70

80 DRY BULB TEMPERATURE - °F

90

100

Chart by: HANDS DOWN SOFTWARE, www.handsdownsoftware.com

10

15 ENTHALPY - Btu per lb. of dry air and associated moisture

20

25 0.20

0.25 SENSIBLE HEAT RATIO = Qs / Qt

0.30

110

120

30
100

0.35

34.0 33.0

28 30
0.92 0.94

30 26
WE
0.90

120

32.0 31.0 0.40 30.0 29.0

90

BAROMETRIC PRESSURE:101.301 kPa
80

TB

ULB

TEM

PER

ATU

24
RE - °C

110

28.0 0.45 27.0 26.0 25.0

22

70

HUMIDITY RATIO (or Specific Humidity) GRAMS OF MOISTURE PER KILOGRAM OF DRY AIR

25...
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