Psychrometrics and Air Conditioning Processes
The chapter focuses on psychrometrics and air conditioning processes, detailing the properties of dry and moist air, including temperature metrics and humidity measures. It discusses the psychrometric chart's function in depicting air properties and outlines basic air conditioning processes such as heating, cooling, humidification, and dehumidification. Key concepts like dew point and saturation are emphasized for their relevance in HVAC system design and moisture management.
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Sections
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What we have learnt
- Moist air is a mixture of dry air and water vapor, which behaves as an ideal gas mixture under certain conditions.
- The psychrometric chart is a vital tool for visualizing air properties and understanding HVAC processes.
- Key processes in air conditioning include sensible heating/cooling, humidification/dehumidification, and their paths on the psychrometric chart.
Key Concepts
- -- Drybulb Temperature (DBT)
- The actual temperature of air, measured using a standard thermometer.
- -- Wetbulb Temperature (WBT)
- The temperature measured by a wetted thermometer; it is always less than or equal to DBT.
- -- Dew Point Temperature (DPT)
- The temperature at which air becomes saturated with moisture, leading to condensation.
- -- Relative Humidity (ϕ)
- The measure of the amount of water vapor present in the air relative to the maximum amount of water vapor that the air can hold at that temperature.
- -- Enthalpy of Moist Air
- The total heat content of moist air, incorporating contributions from both dry air and water vapor.
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