Psychrometry Study of air-water mixtures.

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Psychrometric Properties of Moist Air

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Presentation transcript:

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 [lbmwater/lbmair] relative humidity RH = ratio of actual water content to maximum possible moisture content at a given temperature [%] 100% RH = saturated air

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

HVAC Systems Heating Ventilation Air Conditioning

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

Celcius vs. Fahrenheit Celcius Fahrenheit 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

Temperature Dry bulb Wet bulb  evaporative cooling [Bradshaw 1993]