A psychrometric chart is an attempt to show the relationships in many of the properties of moist air. The chart shows all of the following properties: dry bulb temperature, wet bulb temperature, relative humidity, dew point temperature, humidity ratio, total heat (enthalpy) and specific volume .
How do you explain a 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 is the purpose of a psychrometric chart?
A psychrometric chart presents physical and thermal properties of moist air in a graphical form . It can be very helpful in troubleshooting and finding solutions to greenhouse or livestock building environmental problems.
Which are the 5 factors indicated on a psychrometric chart?
- dry bulb temperature.
- wet bulb temperature (also known as saturation temperature)
- dew point temperature.
- relative humidity.
- moisture content (also known as humidity ratio)
- enthalpy (also known as total heat)
- specific volume (the inverse of density)
How do you calculate psychrometric charts?
- Locate the dry bulb tem- perature. ...
- Locate the ‘humidity ratio’ along the right vertical axis. ...
- Locate the left most curved. line. ...
- Locate the interior curved. lines. ...
- On the right side of the. ...
- On the other side of the. ...
- Look at the information on. ...
- Look closely and find a.
What is psychometric ratio?
The psychrometric ratio is the ratio of the heat transfer coefficient to the product of mass transfer coefficient and humid heat at a wetted surface .
What is the difference between DBT and WBT?
Wet Bulb Temperature of Air (WBT):
The wet bulb temperature of air is also measured by the ordinary thermometer, but the only difference is that the bulb of the thermometer is covered by the wet cloth. ... The difference between the DBT and WBT is called as wet bulb depression .
What is called WBT?
The wet-bulb temperature (WBT) is the temperature read by a thermometer covered in water-soaked cloth (wet-bulb thermometer) over which air is passed.
What are the psychrometric properties?
Psychrometrics is the name given to the study of the air and water vapor mixture. Seven properties of atmospheric air are shown on the psychrometric chart. These properties are: dry bulb temperature, wet bulb temperature, dew point, humidity ratio, relative humidity, specific volume, and specific enthalpy.
What is saturated air?
When a volume of air at a given temperature holds the maximum amount of water vapour , the air is said to be saturated. ... Saturated air, for example, has a relative humidity of 100 percent, and near the Earth the relative humidity very rarely falls below 30 percent.
What is the meaning of sensible heat?
Sensible heat
When an object is heated, its temperature rises as heat is added . ... Similarly, when heat is removed from an object and its temperature falls, the heat removed is also called sensible heat. Heat that causes a change in temperature in an object is called sensible heat.
What is psychrometric calculation?
A psychrometric calculator is an engineering device used to calculate the properties of a gas-vapor mixture , and most often is employed to analyze water vapor in surrounding air.
What is the humidity ratio of dry air?
| % Moisture By Volume Humidity Ratio | % Moisture By Volume%Mv Humidity RatioW LB H2O LB Dry Air | % Moisture By Volume0.0 Humidity Ratio0 | % Moisture By Volume0.1 Humidity Ratio 0.000623 | % Moisture By Volume0.2 Humidity Ratio0.00125 |
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