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2009 ASHRAE Handbook - Fundamentals (IP) © 2009 ASHRAE, Inc.

WMO#: 722445

Lat: 30.59N Long: 96.36W Elev: 328 StdP: 14.52 Time Zone: -6.00 (NAC) Period: 82-06 WBAN: 03904

Ann ual Heatin g and Hum idif icat ion Desi gn Con dit ions

99.6% 99% DP HR MCDB DP HR MCDB WS MCDB WS MCDB MCWS PCWD

1 26.0 30.3 12.2 10.4 33.4 17.8 13.6 38.0 23.0 52.9 20.5 51.8 8.5 350

Ann ual Cool ing, Dehu midi fic ation , and Ent halpy Design Condi tio ns

DB MCWB DB MCWB DB MCWB WB MCDB WB MCDB WB MCDB MCWS PCWD

8 21.3 99.2 76.1 97.1 75.9 95.1 75.9 79.9 90.9 78.8 89.3 78.2 88.3 8.4 170

DP HR MCDB DP HR MCDB DP HR MCDB Enth MCDB Enth MCDB Enth MCDB

77.3 143.7 83.2 76.5 139.7 82.4 75.6 135.5 81.4 43.5 90.3 42.5 89.6 41.7 88.3 672

Extreme Annual Design Conditions

1% 2.5% 5% Min Max Min Max Min Max Min Max Min Max Min Max

20.0 18.2 16.6 84.0 20.5 102.5 6.2 3.2 16.0 104.8 12.4 106.7 8.9 108.5 4.4 110.8

Monthly Climatic Design Conditions

Annual Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecTavg 68.7 51.4 54.5 61.0 68.3 75.7 81.4 84.0 84.5 79.4 70.8 60.3 52.1

Sd 9.91 9.99 8.66 6.93 5.39 3.63 2.79 3.05 5.90 7.51 9.35 10.75HDD50 301 103 60 17 0 0 0 0 0 0 1 20 100HDD65 1628 434 314 179 46 2 0 0 0 2 35 197 419CDD50 7120 145 185 356 548 797 943 1055 1069 883 645 329 165CDD65 2976 12 19 54 144 335 493 590 604 436 213 57 19CDH74 30627 39 105 293 1037 2982 5290 6996 7250 4515 1741 328 51CDH80 14342 2 24 36 239 1128 2497 3690 3925 2168 584 46 3

DB 78.6 82.5 83.8 89.1 94.8 99.0 100.4 102.0 101.1 92.2 84.5 78.6MCWB 64.7 63.3 67.4 71.9 76.0 77.1 76.2 74.9 75.3 72.5 70.7 68.2

DB 74.2 76.7 80.5 85.2 91.1 95.5 98.7 99.4 96.3 89.1 81.0 75.0MCWB 64.0 63.8 66.5 70.6 75.3 76.7 76.8 75.5 74.6 72.5 69.6 66.5

DB 71.1 72.9 77.4 82.6 88.9 93.2 96.6 97.3 93.4 86.3 78.0 72.0MCWB 63.6 62.6 65.1 69.7 74.6 75.8 76.4 75.7 74.2 71.4 68.2 65.0

DB 68.1 70.0 74.2 80.4 86.4 91.2 94.0 95.1 90.9 83.3 74.7 69.2MCWB 62.0 62.3 64.3 68.4 73.7 75.8 76.2 76.0 74.1 70.2 67.3 64.1

WB 69.8 69.9 71.6 76.2 79.9 80.7 81.6 80.4 79.9 78.2 74.3 71.2MCDB 72.6 75.7 78.0 83.3 88.9 92.4 95.0 90.4 88.5 84.6 79.2 75.8

WB 68.0 68.0 70.0 74.1 77.7 79.3 79.7 79.2 78.3 76.3 72.6 68.8MCDB 71.6 72.9 75.6 81.1 86.8 90.0 92.0 90.0 87.1 82.8 77.4 72.6

WB 66.0 66.2 68.6 72.7 76.5 78.3 78.5 78.3 77.4 74.9 71.0 67.1MCDB 69.8 70.8 74.0 79.2 85.1 88.1 89.8 89.0 86.3 81.2 75.7 70.9

WB 62.9 64.2 67.1 71.2 75.3 77.5 77.8 77.6 76.6 73.5 69.2 65.0MCDB 66.9 68.7 72.3 77.2 83.2 86.7 88.6 88.3 85.3 79.3 73.6 68.7

MDBR 19.2 19.4 19.9 20.2 19.0 18.7 20.2 21.3 21.0 20.4 19.8 19.5MCDBR 23.2 23.2 21.3 20.9 20.5 21.3 23.5 24.3 23.4 22.2 20.8 20.5MCWBR 15.0 13.3 11.1 9.9 7.5 6.0 5.6 5.5 6.3 8.9 11.6 13.3MCDBR 18.1 17.9 17.5 17.1 17.8 18.4 20.1 20.5 19.4 16.8 18.0 17.6

MCWBR 14.2 12.2 11.5 9.9 7.8 6.6 6.0 5.8 6.5 8.5 12.3 13.70.342 0.362 0.376 0.396 0.417 0.458 0.463 0.479 0.425 0.368 0.352 0.3362.391 2.298 2.267 2.223 2.211 2.088 2.090 2.029 2.226 2.413 2.415 2.463281 285 288 285 278 265 263 258 269 280 275 27833 39 42 45 46 52 52 54 43 34 32 30

CDD n Cooling degree-days base n°F, °F-day Lat Latitude, ° Period Years used to calculate the design conditionsCDH n Cooling degree-hours base n°F, °F-hour Long Longitude, ° Sd Standard deviation of daily average temperature, °FDB Dry bulb temperature, °F MCDB Mean coincident dry bulb temperature, °F StdP Standard pressure at station elevation, psiDP Dew point temperature, °F MCDBR Mean coincident dry bulb temp. range, °F taub Clear sky optical depth for beam irradianceEbn,noon } Clear sky beam normal and diffuse hori- MCDP Mean coincident dew point temperature, °F taud Clear sky optical depth for diffuse irradianceEdh,noon } zontal irradiances at solar noon, Btu/h/ft2 MCWB Mean coincident wet bulb temperature, °F Tavg Average temperature, °FElev Elevation, ft MCWBR Mean coincident wet bulb temp. range, °F Time Zone Hours ahead or behind UTC, and time zone codeEnth Entha lpy, Btu /lb MCWS Mean coinc iden t wind speed , mph WB Wet bulb t empera ture , °FHDD n Heating degree-days base n°F, °F-day MDBR Mean dry bulb temp. range, °F WBAN Weather Bureau Army Navy numberHours 8/4 & 55/69 Number of hours between 8 a.m. PCWD Prevailing coincident wind direction, °, WMO# World Meteorological Organization number

and 4 p.m with DB between 55 and 69 °F 0 = North, 90 = East WS Wind speed, mphHR Humidity ratio, grains of moisture per lb of dry air

Hours8 to 4 &

55/69

2%

Coldest month WS/MCDB

2%

MCWS/PCWDto 99.6% DB0.4%

1%

1%

MCWS/PCWDto 0.4% DB

Enthalpy/MCDB1% 2%0.4%

ColdestMonth

HottestMonth

Humidification DP/MCDB and HR99.6% 99%

Heating DB

0.4%

5% DB

taub

Monthly DesignDry Bulb

andMean Coincid ent

Wet Bulb

Temperatures

Monthly DesignWet Bulb

andMean Coinci dent

Dry BulbTemperatures

Mean DailyTemperature

Range

0.4%

2%

5%

10%

1% 2%0.4%

Clear SkySolar

Irradiance

Dehumidification DP/MCDB and HR

Ebn,noon

Edh,noon

ExtremeMaxWB

Extreme Annual DB n-Year Return Period Values of Extreme DB

0.4%

Extreme Annual WS

taud

10%

0.4%

2%

5%

n=10 years

1%

5% WB

n=20 years n=50 years

COLLEGE STATION EASTERWOOD FL, TX, USA

Temperatures,Degree-Days

andDegree-Hours

HottestMonth

DB Range

Cooling DB/MCWB Evaporation WB/MCDB

Mean Standard deviation n=5 years