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VAPOR COMPRESSION CYCLE

VAPOR COMPRESSION CYCLE. Cyrogenics. Liquefaction of gases Preservation of biological materials Reduce gas line friction. Gas mixtures. Pure substance – fixed chemical composition Air – considered “pure”; mix of N 2 , O 2 , others. Uniform Water – pure; phase change. Gas mixtures.

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VAPOR COMPRESSION CYCLE

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  1. VAPOR COMPRESSION CYCLE

  2. Cyrogenics • Liquefaction of gases • Preservation of biological materials • Reduce gas line friction

  3. Gas mixtures • Pure substance – fixed chemical composition • Air – considered “pure”; mix of N2, O2, others. Uniform • Water – pure; phase change

  4. Gas mixtures • Mixtures – working fluid; composition affects properties • Non-reacting: humid air • Comfort • Cooling towers • Drying • Reacting • Combustion – fuel + air

  5. Gas mixtures • Ideal gas law: gases & vapors • P, v,T relationships

  6. Definitions • Mass • Mole • Mole fraction

  7. Dalton’s Law • Each component in a mixture behaves as if sole occupant of volume • Partial pressure • Mole fraction

  8. Amagat’s law • Volume is composed of volumes of individual gases • Mole fraction

  9. Humid air • Consider water vapor in behavior • Processes: composition changes • Humidification • Cooling • Drying

  10. Psychrometrics • Science of humid air • Air & water vapor – ideal gases • Specific heats constant • Specific enthalpy = f(T) • Patm=Pdry air+ Pwater vapor – partial pressures

  11. Psychrometrics • Dry bulb temperature • Wet bulb temperature • Dew point • Relative humidity • Specific humidity

  12. Psychrometrics • Definitions • DBT • Dew point • Specific humidity • Specific humidity /partial pressure relation • Φ • WBT

  13. Microprocessor based, extremely accurate. Memory (MIN / MAX). Super fast. Wet bulb calculated in 5 seconds. Electronic capacitance type polymer film sensor.

  14. Psychrometrics • Can sweating • Glasses fogging • Dryer

  15. Psychrometric Chart • DBT • WBT • Φ • Specific humidity • Specific volume • Specific enthalpy

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