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Chapter 3a air conditioning process pdf
- 1. AIR CONDITIONING andVENTILATION SYSTEMS NME 515 Chapter 3 Air Conditioning Process Engr. Charlton Inao, ME TESDA TVET NC Level 3 RAC-CRE Certified
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- 8. Humidification ◼ The transferof water vapor to atmospheric air is referred to as humidification ◼ Here the term latent heat transfer is used. This process is usually accomplished by introducing water vapor or by spraying fine droplets of water that evaporate into the circulating air stream. Wetted mats or plates may also be used.
- 9. Dehumidification ◼ The oppositeof humidification, which means reducing or removing moisture or water vapor in the air.
- 12. Review: Psychrometry ◼ Psychrometryis the science dealing with the physical laws of air – water mixtures. ➢ When designing an air conditioning system, the temperature and moisture content of the air to be conditioned, and the same properties of the air needed to produce the desired air conditioning effect, must be known. ➢ Once these properties are known, the air conditioning task can be determined.
- 13. Properties of Air Dry-bulbtemperature Wet-bulb temperature Dew-point temperature Relative humidity Humidity ratio(specific humidity)
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- 15. Dew Point Temperature ◼Condensation occurs at the Dew Point Temperature
- 16. Saturation temperature ◼ Saturationtemperature occurs at 100 % RH where WB, DB and DP temperature is the same (Fog)
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- 19. Air conditions atthe psychrometric chart
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- 21. Enthalpy ◼ The totalheat energy in one pound of air (Btu/lb) at its present condition Enthalpy (h) = Sensible Heat + Latent Heat
- 22. Chart Exercise ◼ SummerDesign Conditions 95°F DB (dry bulb) 78°F WB (wet bulb) Find: Relative Humidity Humidity Ratio Dew Point
- 23. Answer Summer Design Conditions 95°FDB (dry bulb)7 78°F WB (wet bulb) Find: Relative Humidity Humidity Ratio Dew Point
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