thermodynamic and enthalpy chart
TRANSCRIPT
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Thermo-dymanic and Enthalpy Chart
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• Quick Physics Review• Pressure-Enthalpy Chart• Water Chiller Pressure-Enthalpy Chart• Pressure-Enthalpy Chart curves• Cycles in refrigeration
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First Law of Thermodynamics
• You can neither produce nor destroy energy.
• You can only change its form
• Heat and mechanical energy are mutually convertible
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Second Law of Thermodynamics
• Heat flows from a body of higher intensity to a body of lower intensity
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Boyle’s Law
• The volume of a gas varies inversely with its pressure (if the temperature of the gas remains constant)
• To increase the pressure, reduce the volume
• If the volume is doubled, the pressure will be reduced by 50%
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Charles Law
• The volume of a gas is in direct proportion to its temperature, provided the pressure is kept constant, and...
• the pressure of a gas is in direct proportion to its temperature, provided that the volume is kept constant
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Pressure and Boiling Temperature• Water boils at
100°C at sea level
• Water boils at 84°C at the top of The MONT BLANC (4807 m above sea level)
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Negative Pressure
• Vacuum• Rated in mm of mercury
(mm HG)
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Gauge Pressure
• Relative to atmospheric pressure
• Calibrated to read zero when open to ambient air
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THE CALORIE
• The amount of heat required to raise the temperature of one gram of water on 1°degree Celsius
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THE JOULE
• 1 KCal = 1000 Calories
• 1 KCal = 4,185 KJoules
• 1 Kcal = -1fg
• 1 BTU = 1,052 Kjoules
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THE WATT
• 1 Watt = 1 Joule/ 1second
• 1 KWatt = 1000 Watt
• 1 HP = 0,745 KWatt
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Heat Transfer and Change of State
• Boiling occurs at a constant temperature
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Heat Transfer and Change of State
• Condensation occurs at a constant temperature
Light
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Changes of states for water
Pressure :1013 mbar
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Sensible Heat Gain
Adding Heat
WATER
Atmospheric pressure
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Vaporization
Water Boiling
Liquid turns to vapor
Atmospheric Pressure
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Saturation
212° F
Atmospheric Pressure
Both liquid and vapor in the same container
100° C
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Changing the Saturation Point
Water Boiling
A pressure cooker prevents vapor from escaping.
An increase in pressure on the surface of a liquid, will produce an increase of the boiling point of that liquid. 1 bar gauge
120°C
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Lowering the Saturation Point
Water Boiling
A vacuum pump draws all air out of the vessel.
A decrease in pressure on the surface of a liquid, will produce a decrease of the boiling point of that liquid. 23,3 mbar vacuum
20°C
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mbar
1.013 1.98 3.63 10 15.6 120
°C 100 120 140 160 180 200 300 325
6.2
°C
bar
mmHg
-15 0 10 20
Pressure/Temperature relationship for water
30 40 50 60 70 80 90 100
1.9 6.1 12.2 23.3 42.2 73.7 123 198 310 473 700 1013
1.43 4.58 9.2 17.5 31.8 55.3 92.5 149 233 355 525 760
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Pressure
Enthalpy
Pressure - Enthalpy Chart
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Pressure
Enthalpy
Heat Content(KJoules/Kg)
Pressure - Enthalpy Chart
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Pressure
Enthalpy
Pressure - Enthalpy Chart
Liqu
id L
ine
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Pressure
Enthalpy
Pressure - Enthalpy Chart
Liquid - VaporMixLi
quid
Lin
e
Vap
or L
ine
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Pressure
Enthalpy
Pressure - Enthalpy Chart
100% Liquid
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Pressure
Enthalpy
Pressure - Enthalpy Chart
100% Vapor
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Pressure
Enthalpy
20% Liquid 80% Vapor
Pressure - Enthalpy Chart
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Pressure
Enthalpy
Pressure - Enthalpy Chart
Evaporator
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Pressure
Enthalpy
Pressure - Enthalpy Chart
Evaporator
Refrigerant absorbs heat from load
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Pressure
Enthalpy
Pressure - Enthalpy Chart
Evaporator
Refrigerant absorbs heat from load
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Pressure
Enthalpy
Evaporator
Pressure - Enthalpy Chart
Refrigeration
Effect
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Pressure
Enthalpy
Pressure - Enthalpy Chart
Compressor
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Pressure
Enthalpy
Pressure - Enthalpy Chart
CompressorHead Pressure
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Pressure
Enthalpy
Pressure - Enthalpy Chart
Condenser
Refrigerant rejects heat to atmosphere
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Pressure
Enthalpy
Pressure - Enthalpy Chart
Condenser
Refrigerant rejects heat to atmosphere
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Pressure
Enthalpy
- Thermal expansion valve
- Fixed orifice- Variable orifice
Metering Device
Pressure - Enthalpy Chart
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Pressure
Enthalpy
Pressure - Enthalpy Chart
Evaporator
Compressor
Condenser
Metering Device
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Pressure
Enthalpy
Pressure - Enthalpy Chart
Evaporator
Compressor
Condenser
Metering Device
Refrigerant absorbs heat from load
Refrigerant rejects heat to atmosphere
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Pressure
Enthalpy
Pressure - Enthalpy Chart (Water Chiller)
44°6°C
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Pressure
Enthalpy
Pressure - Enthalpy Chart (Water Chiller)
44° 6°C
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Pressure
Enthalpy
Pressure - Enthalpy Chart (Water Chiller)
6°
12°
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Pressure
Enthalpy
Pressure - Enthalpy Chart (Water Chiller)
6°
12°
35°
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Pressure
Enthalpy
Pressure - Enthalpy Chart (Water Chiller)
Cooling Tower
6°
12°
35°
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Pressure
Enthalpy
Pressure - Enthalpy Chart (Water Chiller)
35°
30°
Cooling Tower
6°
12°
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Pressure
Enthalpy
Pressure - Enthalpy Chart
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Pressure
Enthalpy
Pressure - Enthalpy Chart
Refrigeration
Effect
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Refrigeration
Effect
Pressure
Enthalpy
Pressure - Enthalpy Chart
Adding a subcooler
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Refrigeration
Effect
Pressure
Enthalpy
Pressure - Enthalpy Chart
Adding a subcooler
subcooling
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Refrigeration
Effect
Pressure
Enthalpy
Pressure - Enthalpy Chart
Adding a subcooler
Increased refrigeration effect
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Refrigeration
Effect
Pressure
Enthalpy
Pressure - Enthalpy Chart
Adding a subcoolerIncreases refrigeration effectIncreases energy efficiency
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Enthalpic Chart :Curves
• Isobars bar• Isotherms °C• Isenthalpic KJ/kg• Isentropic KJ/kg K• Isovolume m³/kg• Isotitles %
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Enthalpic chart R22
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Enthalpic chart R22
Isobars (bar)
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Enthalpic chart R22
Isotherm 0°C
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Enthalpic chart R22
Isen
thal
pic
200
KJ/
kg
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Enthalpic chart R22
isen
trop
ic S
=1.
8 K
J/kg
K
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Enthalpic chart R22
Isochore v = 0.100 m³/kg
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Enthalpic chart R22
Isot
itle
%
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Cycles in refrigeration
• Single stage cycle R22• Bi-stage cycle NH3 with Flooded economizer• Bi-stage cycle NH3 with partial injection
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Single stage cycle R22
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Bi-stage cycle NH3 with Flooded economizer
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Bi-stage cycle NH3 with partial injection
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THE END
HOURRA !!!