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Psychrometry

Psychrometry. Study of air-water mixtures. Psychrometric Chart. Relationships between temperature absolute humidity or humidity ratio W in [grain]=[1 lbm/7,000] or in [lbm water /lbm air ] relative humidity RH

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Psychrometry

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  1. Psychrometry • Study of air-water mixtures

  2. Psychrometric Chart Relationships between • temperature • absolute humidity or humidity ratio W in [grain]=[1 lbm/7,000] or in [lbmwater/lbmair] • relative humidity RH = ratio of actual water content to maximum possible moisture content at a given temperature [%] • 100% RH = saturated air

  3. HVAC System Comforts • Temperature • Air quality: no dust, toxic gases, odors • Humidity • Radiation • Air Flow • Noise

  4. HVAC Systems Heating Ventilation Air Conditioning

  5. Who Defines Requirements? • Occupants and their activity, expectations, health • Equipment • Season (acclimatization) • Economics & Market Offering

  6. Celcius vs. Fahrenheit • Celcius • 0°C = freezing of ice • 100°C = boiling of water at 1 atm • Fahrenheit • 0°F = freezing of seawater • 100°F = melting of butter • 212°F = boiling of water t [°C] = (T [°F] – 32°F) * 5/9 °C/°F or T [°F] = 1.8 °F/°C * t [°C] + 32 °F

  7. Temperature • Dry bulb • Wet bulb  evaporative cooling [Bradshaw 1993]

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