gas – vapor mixtures and air-conditioning cccc hhhh …mazlan/?download=mazlan's lecture mne...
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1
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
Gas – Vapor Mixtures and Air-Conditioning
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
2
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
3
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
4
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
5
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
The Cp of air can be assumed to be constant at 1.005 kJ/(kg · °C) in the temperature range - 10 to 50°C with an error under 0.2 percent.
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
At temperatures below 50°C, the h = constant lines coincide withthe T = constant lines in the superheated vapor region of water.
6
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
For saturated air, the vapor pressure is equal to the saturationpressure of water.
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
Specific humidity is the actual amount of water vapor in 1 kg of dry air, whereas relative humidity is the ratio of the actual amount of moisture in the air to the maximum amount of moisture air can hold at that temperature.
7
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
The enthalpy of moist (atmospheric) air is expressed per unit mass of dry air, not per unit mass of moist air.
13-6
Constant-pressure cooling of moist air and the dew-point temperature on the T-s diagram of water.
8
The adiabatic saturation process and its represen-tation on a T-s diagram of water.
A simple arrangement to measure the wet-bulb temperature.
9
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
Schematic for a psychrometric chart.
10
For saturated air, the dry-bulb, wet-bulb, and dew-point temperatures are identical.
Various air-conditioning processes.
11
During simple heating, specific humidity remains constant, but relative humidity decreases.
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
During simple cooling, specific humidity remains constant, but relative humidity increases.
12
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
Heating the humidification.
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
Schematic and psychrometric chart
13
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
Schematic and psychrometricchart
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
14
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
Evaporative cooling.
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
When two airstreams at states 1 and 2 are mixed adiabatically, the state of the mixture lies on the straight line connecting the two states.
15
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
An induced-draft counterflow cooling tower.
CCCC
HHHH
AAAA
PPPP
TTTT
EEEE
RRRR
1111
Mazlan 2008
UTM
FKM
UNIVERSITI TEKNOLOGI MALAYSIA MECHANICAL AND ELECTRICAL SYSTEM
A spray pond
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