2009 ASHRAE Handbook - Fundamentals (SI) 2009 ASHRAE, Inc.

WMO#: 412560

Lat: 23.58N Long: 58.28E Elev: 15 StdP: 101.14 Time Zone: 4.00 (ARN) Period: 83-06 WBAN: 99999

Annual Heating and Humidification Design Conditions

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

1 15.5 16.5 -0.2 3.7 31.6 2.1 4.4 29.5 9.4 24.9 8.3 24.4 1.6 200Annual Cooling, Dehumidification, and Enthalpy Design Conditions

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

6 8.6 42.8 22.5 41.2 22.6 40.1 22.9 30.2 34.0 29.7 33.6 29.3 33.2 4.9 340

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

29.2 26.0 32.6 28.9 25.5 32.5 28.2 24.4 32.1 101.6 34.0 99.1 33.6 96.9 33.2 83Extreme Annual Design Conditions

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

8.6 7.5 6.5 33.3 12.8 46.1 0.9 1.2 12.1 46.9 11.6 47.6 11.1 48.3 10.4 49.2Monthly Climatic Design Conditions

Annual Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecTavg 28.3 21.0 21.9 24.7 29.3 34.0 35.0 33.6 31.9 31.1 29.3 25.4 22.4Sd 1.67 1.86 2.55 3.08 2.81 2.51 2.55 2.34 2.05 1.92 1.73 1.68

HDD10.0 0 0 0 0 0 0 0 0 0 0 0 0 0HDD18.3 1 1 0 0 0 0 0 0 0 0 0 0 0CDD10.0 6692 341 333 454 580 743 749 733 679 632 599 462 386CDD18.3 3652 83 101 196 330 485 499 474 421 382 341 212 128CDH23.3 48896 277 457 1579 4378 7897 8295 7479 6204 5358 4391 1931 652CDH26.7 28848 18 59 491 2362 5432 5895 5001 3733 2991 2203 597 67

DB 28.5 31.0 35.2 40.6 44.2 44.9 43.3 42.0 40.1 38.9 33.7 29.9MCWB 19.2 18.3 19.7 20.6 21.5 21.9 22.6 23.2 22.6 21.0 20.1 19.8

DB 26.9 28.2 32.7 38.2 42.3 42.9 41.2 39.8 38.1 36.5 31.9 28.1MCWB 19.3 18.9 19.2 20.5 21.8 22.8 23.4 24.3 23.2 21.5 21.1 21.1

DB 25.8 27.0 30.9 36.5 40.9 41.2 40.0 37.9 36.8 35.0 30.8 27.2MCWB 19.2 19.3 19.6 20.7 21.8 22.9 23.7 24.8 23.9 22.2 22.0 21.0

DB 24.9 25.9 29.2 35.0 39.2 40.0 38.2 36.0 35.1 33.8 29.8 26.5MCWB 19.1 19.5 19.9 20.7 22.0 23.2 24.7 26.2 24.6 23.0 22.2 20.8

WB 22.9 22.9 24.8 26.8 29.6 30.8 30.8 30.6 29.2 28.2 25.4 23.7MCDB 25.3 25.9 28.2 31.1 33.4 34.4 34.4 34.1 32.9 32.2 29.8 26.9

WB 21.4 22.1 23.9 25.8 28.7 30.1 30.2 29.8 28.6 27.3 24.5 22.9MCDB 24.6 25.4 27.3 30.1 32.8 34.1 34.0 33.4 32.1 31.4 29.2 26.4

WB 20.6 21.4 23.2 25.0 27.9 29.6 29.7 29.2 28.1 26.6 23.8 22.2MCDB 24.2 24.7 26.6 29.6 32.4 33.7 33.6 32.9 31.5 30.9 28.6 25.9

WB 19.7 20.7 22.4 24.2 27.0 29.1 29.2 28.7 27.6 26.1 23.1 21.5MCDB 23.7 24.1 26.2 29.5 32.4 33.3 33.2 32.3 31.2 30.4 28.0 25.3

MDBR 7.5 7.8 8.1 9.2 9.5 8.6 7.0 6.7 7.7 9.1 8.7 7.8MCDBR 8.5 9.3 10.5 11.4 11.4 10.8 9.9 9.6 10.3 10.8 10.0 8.7MCWBR 5.1 6.0 6.8 7.1 7.2 8.3 7.3 6.6 7.1 8.2 7.3 5.3MCDBR 7.8 8.0 8.2 9.2 8.7 8.2 7.2 7.0 7.7 8.4 8.7 7.9MCWBR 5.2 5.6 5.9 7.1 7.5 7.4 5.4 4.9 5.4 6.8 6.8 5.1

0.436 0.506 0.709 0.651 0.768 0.982 1.042 1.110 0.717 0.523 0.471 0.4411.995 1.795 1.420 1.526 1.366 1.183 1.165 1.123 1.449 1.779 1.877 1.973813 778 645 699 618 496 467 433 630 752 768 789162 208 315 291 340 405 413 427 301 208 179 160

CDDn Cooling degree-days base nC, C-day Lat Latitude, Period Years used to calculate the design conditions CDHn Cooling degree-hours base nC, C-hour Long Longitude, Sd Standard deviation of daily average temperature, C DB Dry bulb temperature, C MCDB Mean coincident dry bulb temperature, C StdP Standard pressure at station elevation, kPa DP Dew point temperature, C MCDBR Mean coincident dry bulb temp. range, C taub Clear sky optical depth for beam irradiance Ebn,noon } Clear sky beam normal and diffuse hori- MCDP Mean coincident dew point temperature, C taud Clear sky optical depth for diffuse irradiance Edh,noon } zontal irradiances at solar noon, W/m2 MCWB Mean coincident wet bulb temperature, C Tavg Average temperature, C Elev Elevation, m MCWBR Mean coincident wet bulb temp. range, C Time Zone Hours ahead or behind UTC, and time zone code Enth Enthalpy, kJ/kg MCWS Mean coincident wind speed, m/s WB Wet bulb temperature, C HDDn Heating degree-days base nC, C-day MDBR Mean dry bulb temp. range, C WBAN Weather Bureau Army Navy number Hours 8/4 & 12.8/20.6 Number of hours between 8 a.m. PCWD Prevailing coincident wind direction, , WMO# World Meteorological Organization number

and 4 p.m with DB between 12.8 and 20.6 C 0 = North, 90 = East WS Wind speed, m/s HR Humidity ratio, g of moisture per kg of dry air

Hours8 to 4 &

12.8/20.6

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 Design Dry Bulb

and Mean Coincident

Wet BulbTemperatures

Monthly Design Wet Bulb

and Mean Coincident

Dry BulbTemperatures

Mean DailyTemperature

Range

0.4%

2%

5%

10%

1% 2%0.4%

Clear Sky Solar

Irradiance

Dehumidification DP/MCDB and HR

Ebn,noonEdh,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

SEEB INTL AIRPORT, Oman

Temperatures,Degree-Days

and Degree-Hours

HottestMonth

DB Range

Cooling DB/MCWB Evaporation WB/MCDB

Mean Standard deviation n=5 years