Design conditions for RALEIGH/DURHAM, NC, USA - ASHRAE

2005 ASHRAE Handbook - Fundamentals (SI)

? 2005 ASHRAE, Inc.

Design conditions for RALEIGH/DURHAM, NC, USA

Station Information

Station name 1a

WMO#

Lat

1b

1c

Long

Elev

1d

1e

StdP 1f

Hours +/- Time zone

UTC

code

1g

1h

Period 1i

RALEIGH/DURHAM

723060 35.87N 78.77W 134 99.73 -5.00 NAE 7201

Annual Heating and Humidification Design Conditions

Coldest month

2

Heating DB

99.6% 3a

99% 3b

Humidification DP/MCDB and HR

Coldest month WS/MCDB

MCWS/PCWD

99.6%

99%

0.4%

1%

to 99.6% DB

DP

HR

MCDB

DP

HR

MCDB

WS

MCDB

WS

MCDB MCWS PCWD

4a

4b

4c

4d

4e

4f

5a

5b

5c

5d

6a

6b

1

-8.7

-6.0 -17.4

0.8

-4.3

-15.0

1.0

-2.5

10.8

7.7

9.2

6.9

3.0

0

Annual Cooling, Dehumidification, and Enthalpy Design Conditions

Hottest month

7

Hottest month DB range

8

0.4%

DB

MCWB

9a

9b

Cooling DB/MCWB

1%

DB

MCWB

9c

9d

2%

DB

MCWB

9e

9f

0.4%

WB

MCDB

10a

10b

Evaporation WB/MCDB

1%

WB

MCDB

10c

10d

2%

WB

MCDB

10e

10f

MCWS/PCWD

to 0.4% DB

MCWS PCWD

11a

11b

7

10.6

34.3 24.5

32.9 24.2 31.7

23.5 25.7 31.5

25.1 30.7 24.6

29.7

4.0

240

Dehumidification DP/MCDB and HR

0.4%

1%

DP

HR

MCDB

DP

HR

MCDB

DP

12a

12b

12c

12d

12e

12f

12g

Enthalpy/MCDB

2%

0.4%

1%

2%

HR

MCDB

Enth

MCDB

Enth

MCDB

Enth

MCDB

12h

12i

13a

13b

13c

13d

13e

13f

24.1

19.4

28.0

23.6

18.7

27.4

23.0

18.1

26.8

79.6

31.6

77.1

30.8

74.7

29.9

Extreme Annual Design Conditions

Extreme Annual WS

1%

2.5%

5%

14a

14b

14c

Extreme Max WB 15

Extreme Annual DB

Mean

Standard deviation

Max

Min

Max

Min

16a

16b

16c

16d

n=5 years

Max

Min

17a

17b

n-Year Return Period Values of Extreme DB

n=10 years

n=20 years

Max

Min

Max

Min

17c

17d

17e

17f

n=50 years

Max

Min

17g

17h

8.5

7.6

6.8

28.2

36.2 -12.6

1.6

3.4

37.4 -15.0 38.3 -17.0 39.2 -18.9 40.3 -21.4

Monthly Design Dry Bulb and Mean Coincident Wet Bulb Temperatures

Jan

Feb

Mar

Apr

May

Jun

%

DB

MCWB

DB

MCWB

DB

MCWB

DB

MCWB

DB

MCWB

DB

MCWB

18a

18b

18c

18d

18e

18f

18g

18h

18i

18j

18k

18l

0.4%

21.2

16.1

23.8

15.3

27.8

17.8

30.8

18.6

32.1

22.4

34.9

24.4

1%

19.9

15.5

21.8

14.7

26.2

16.9

29.6

18.4

31.2

21.8

33.9

24.1

2%

18.6

14.8

20.3

14.2

24.7

16.0

28.4

17.9

30.2

21.4

33.0

23.9

Jul

Aug

Sep

Oct

Nov

Dec

%

DB

MCWB

DB

MCWB

DB

MCWB

DB

MCWB

DB

MCWB

DB

MCWB

18m

18n

18o

18p

18q

18r

18s

18t

18u

18v

18w

18x

0.4%

36.4

24.5

35.8

24.9

33.4

23.8

29.5

21.4

25.7

17.4

23.0

17.6

1%

35.4

24.8

34.6

24.7

32.3

23.5

28.2

20.6

24.3

17.2

21.7

16.9

2%

34.6

24.7

33.6

24.5

31.3

23.1

27.0

19.9

23.3

17.1

20.3

16.7

Monthly Design Wet Bulb and Mean Coincident Dry Bulb Temperatures

Jan

Feb

Mar

Apr

May

Jun

%

WB

MCDB

WB

MCDB

WB

MCDB

WB

MCDB

WB

MCDB

WB

MCDB

19a

19b

19c

19d

19e

19f

19g

19h

19i

19j

19k

19l

0.4%

17.9

19.8

18.0

21.0

19.3

24.3

21.0

26.0

24.2

29.4

25.8

31.8

1%

17.1

18.8

16.9

19.8

18.6

23.7

20.3

25.8

23.6

28.7

25.4

31.4

2%

16.0

17.7

16.0

18.8

17.8

22.2

19.8

25.5

23.0

28.0

24.9

30.7

Jul

Aug

Sep

Oct

Nov

Dec

%

WB

MCDB

WB

MCDB

WB

MCDB

WB

MCDB

WB

MCDB

WB

MCDB

19m

19n

19o

19p

19q

19r

19s

19t

19u

19v

19w

19x

0.4%

26.8

32.7

26.4

32.2

25.1

30.3

23.0

26.5

20.4

22.5

19.4

21.9

1%

26.3

32.5

25.9

31.6

24.6

29.5

22.1

25.7

19.8

21.8

18.3

20.3

2%

25.8

31.8

25.6

31.2

24.2

28.7

21.5

24.9

19.1

21.3

17.2

19.2

Monthly Mean Daily Temperature Range

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

20a

20b

20c

20d

20e

20f

20g

20h

20i

20j

20k

20l

10.4

11.3

12.1

13.1

12.1

11.1

10.6

10.3

10.5

12.4

11.9

10.6

WMO# Elev DB WS MCDB PCWD

World Meteorological Organization number

Lat

Elevation, m

StdP

Dry bulb temperature, ?C

DP

Wind speed, m/s

Enth

Mean coincident dry bulb temperature, ?C

MCWB

Prevailing coincident wind direction, ?, 0 = North, 90 = East

Latitude, ? Standard pressure at station elevation, kPa Dew point temperature, ?C Enthalpy, kJ/kg Mean coincident wet bulb temperature, ?C

Long

WB HR MCWS

Longitude, ?

Wet bulb temperature, ?C Humidity ratio, grams of moisture per kilogram of dry air Mean coincident wind speed, m/s

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