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Psychrometric Properties
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Dry Bulb Temperature
Dry Bulb Temperature is the temperature of air measured by a thermometer freely exposed to the air but shielded from radiation and moisture. It is the temperature one usually refers to as air temperature and it is an important factor in determining the thermal comfort level in air-conditioned spaces.
Specific Humidity
Specific Humidity, also known as the moisture content of the air, refers to the mass of water vapor per unit mass of dry air. It's denoted by the symbol and is expressed in units such as kg/kg of dry air. It is relevant to air conditioning since it helps in calculating the enthalpy (total heat content) of the air-water vapor mix, which is necessary for designing and analyzing A/C systems.
Wet Bulb Temperature
Wet Bulb Temperature is the lowest temperature that can be reached by the evaporation of water only. It is measured by a thermometer that has a wet cloth (wick) around the bulb and is indicative of the moisture content in the air. In air conditioning, it's used to determine the humidity level and the cooling capacity needed to reach comfortable conditions.
Relative Humidity
Relative Humidity is the percentage measure of the amount of water vapor present in the air compared to the maximum amount the air can hold at a given temperature. It is a crucial factor in creating comfortable indoor environments and is carefully controlled in air conditioning systems to maintain comfort and prevent excessive moisture, which could lead to mold or structural damage.
Dew Point Temperature
The Dew Point Temperature is the temperature at which air becomes saturated with water vapor and water begins to condense, forming dew. It is a direct measure of the atmospheric moisture content and is crucial for air conditioning as it determines the threshold below which moisture will start to condense on cold surfaces, which is an important consideration in ductwork and coil design.
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