8 th AWF By: Dr. Mazlan Abbas. © Dr. Mazlan Abbas, MIMOS, All Rights Reserved Penetration Rate.
Gas – Vapor Mixtures and Air-Conditioning CCCC HHHH …mazlan/?download=Mazlan's Lecture MNE 3rd -...
Transcript of Gas – Vapor Mixtures and Air-Conditioning CCCC HHHH …mazlan/?download=Mazlan's Lecture MNE 3rd -...
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Gas – Vapor Mixtures and Air-Conditioning
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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.
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At temperatures below 50°C, the h = constant lines coincide withthe T = constant lines in the superheated vapor region of water.
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For saturated air, the vapor pressure is equal to the saturationpressure of water.
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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.
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The enthalpy of moist (atmospheric) air is expressed per unit mass of dry air, not per unit mass of moist air.
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Constant-pressure cooling of moist air and the dew-point temperature on the T-s diagram of water.
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The adiabatic saturation process and its represen-tation on a T-s diagram of water.
A simple arrangement to measure the wet-bulb temperature.
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Schematic for a psychrometric chart.
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For saturated air, the dry-bulb, wet-bulb, and dew-point temperatures are identical.
Various air-conditioning processes.
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During simple heating, specific humidity remains constant, but relative humidity decreases.
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During simple cooling, specific humidity remains constant, but relative humidity increases.
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Heating the humidification.
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Schematic and psychrometric chart
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Schematic and psychrometricchart
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Evaporative cooling.
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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.
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An induced-draft counterflow cooling tower.
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A spray pond