lecture 1-31 grg sec1 - Biometeorological Applications Heat...

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Lecture 1-31-08 GRG 301K Temperature Controls Solar radiation is the primary control Place to Place changes are due to: 1. Differential heating of land/water 2. Ocean currents 3. Elevation 4. Latitude and geographic position Heating/ Cooling Degree Days HDD/CDDs developed by heating engineers (energy related operations) in the early 20 th century) HDD/CDDs are a practical method of evaluating energy demand and consumption Based on the assumption that heating/cooling in buildings is NOT required where the daily mean temperature is 65°F/18.3°C. HDD/CDDs are cumulative (annually) Step 1= high temp + low temp ÷ 2 = average Step 2= average < 65 = HDD Average > 65 = CDD Step 3= Average – 65 = HDD/CDD Ex: 95°F+ 75°F ÷2= 85° 85° > 65° = CDD 85° - 65° = 20 CDD HDD/CDD seasons: CDD season: January – December HDD season: July 1- June 30 For Austin Average annual HDDs: 1185 Average annual CDDs: 3375
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Unformatted text preview: Biometeorological Applications: Heat Stress Index • Developed by R.G. Steadham in 1983 • Two Factors: Temperature and Humidity • Based on evaporative cooling process • Humidity slows evaporation down and body gets warmer as a result; if in very high humidity there is heat related illness because body can’t regulate its temperature through sweat/ evaporation. • 1 st sign of heat related illness is body stops sweating and body temperature sky rockets. Wind Chill Index • Developed for polar scientists in 1940s • Updated by NOAA/ National Weather Service in 2001 for a more meaningful use worldwide • Two Factors: Air Temperature and Wind Speed • Other important factors: Relative humidity/solar radiation • Clothing and physical (body) dependent 80-85% body heat is lost through the head Heat stress index Lecture 1-31-08 GRG 301K...
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