What is adiabatic process on psychrometric chart?
Adiabatic humidification injects water (not steam) directly into the air using a spray mechanism or wetted medium, and the heat from the surrounding air causes the water to evaporate. So instead of sliding up the vertical dry bulb temperature line on the psychrometric chart, we move diagonally up the wet bulb line.
What are the 6 psychometric process?
This is the series of articles that describes psychrometric chart and various psychrometric processes like sensible heating, sensible cooling, humidification, de-dumidification, evaporative cooling etc.
What is an adiabatic saturation process?
Explanation: Adiabatic saturation: When unsaturated air flows over a long sheet of water in an insulated chamber, the water evaporates, and the specific humidity of the air increases. The process continues until the energy transferred from the air to the water is equal to the energy required to vaporize the water.
Why is adiabatic compression important?
The adiabatic compression of a gas causes a rise in temperature of the gas. Adiabatic expansion against pressure, or a spring, causes a drop in temperature. Adiabatic cooling occurs when the pressure on an adiabatically isolated system is decreased, allowing it to expand, thus causing it to do work on its surroundings.
What is psychrometric chart?
Psychrometric charts are complex graphs that can be used to assess the physical and thermodynamic properties of gas-vapour mixtures at a constant pressure. They are often used to assess the properties of moist air.
What are psychrometric processes?
a psychrometric process that involves the increase or decrease in the temperature of air without changing its humidity ratio. Example: passing moist air over a room space heater and of kiln air over the heating coils.
What is DBT and WBT in psychrometric chart?
Wet-bulb temperature (WBT) The thermodynamic wet-bulb temperature is a thermodynamic property of a mixture of air and water vapor. Knowing both the dry-bulb temperature (DBT) and wet-bulb temperature (WBT), one can determine the relative humidity (RH) from the psychrometric chart appropriate to the air pressure.
How does a psychrometric chart work?
Psychrometric charts show temperature vs. humidity, and can be used to express human thermal comfort, design strategies, and energy requirements for those strategies. Every psychrometric chart includes vertical lines that represent the dry bulb temperatures. Air temperature increases from left to right.
Is evaporative cooling and adiabatic process?
Evaporative cooling is essentially an adiabatic process, with negligible heat flow, as air is passed through a wetted media or water spray.
How is heating and dehumidifying represented in the psychrometric chart?
The dehumidification process maintains air at its dry bulb (DB) temperature constant while removing moisture. This process is represented on a psychrometric chart by drawing a straight vertical line that starts at the initial relative humidity value and extends downward to the ending relative humidity.
How does adiabatic cooling work in a psychrometric system?
Adiabatic or Evaporative Cooling a psychrometric process that involves the cooling of air without heat loss or gain. Sensible heat lost by the air is converted to latent heat in the added water vapor
How are processes analysed in a psychrometric chart?
Once identified, the processes can be analysed by applying the laws of conservation of mass and energy. All these processes can be plotted easily on a psychrometric chart. This is very useful for quick visualization and also for identifying the changes taking place in important properties such as temperature, humidity ratio, enthalpy etc.
Is the psychrometric chart useful for air conditioning?
At first appearence the psychrometric chart is quite confusing, however with some practice it becomes an extremely useful tool for rapidly evaluating air-conditioning processes.
Which is the saturation line on a psychrometric chart?
A Psychrometric chart graphically represents the thermodynamic properties of moist air. Standard psychrometric charts are bounded by the dry-bulb temperature line (abscissa) and the vapour pressure or humidity ratio (ordinate). The Left Hand Side of the psychrometric chart is bounded by the saturation line.