What does a psychrometric chart tell you?
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.
How do you analyze a psychrometric chart?
Take a ruler and draw a vertical line at the dry bulb temperature of 70 and draw a horizontal line where the dew point is 50. The point where these two lines intersect is known as a ‘state point’. Plot the state point and you can also read the rel- ative humidity, wet bulb, enthalpy, vapor pressure and humidity ratio.
Which are the 5 factors indicated on a psychrometric chart?
1. Introduction
- 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)
Who uses 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 properties?
Psychrometrics is the science of air and water vapor and deals with the properties of moist air. This chapter presents a psychrometric chart, which shows the properties of moist air in terms of dry-bulb temperature, wet-bulb temperature, relative humidity, humidity ratio, and enthalpy.
What is psychrometric 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 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 psychrometric chart what is it used for how is it used?
What is psychrometric process?
a psychrometric process that involves the simultaneous increase in both the dry bulb temperature and humidity ratio of the air. Cooling and Dehumidifying> a psychrometric process that involves the removal of water from the air as the air temperature falls below the dew- point temperature.
What does a psychrometric chart look like on a computer?
Now for those of you who didn’t raise your hand a Psychrometric Chart is something that looks like an American Indian Dream Catcher, a beautifully woven string pattern used to capture and preserve your dreams. It is a “visual” representation of thermal dynamic properties using data points consisting of things like:
What does the upper boundary of a psychrometric chart represent?
You will find that the upper curved boundary of the chart has one temperature scale, yet can represent three types of temperature: wet-bulb, dry-bulb, and dewpoint. This upper curved boundary also represents 100 percent relative humidity or saturated air.
What are the properties of moist air on a psychrometric chart?
Properties of moist air on a psychrometric chart. Wet-bulb temperature and enthalpy use the same chart line but values are read off seperate scales. An understanding of the shape and use of the psychrometric chart will help you diagnose air temperature and humidity problems.
Where is the cool air point on the psychrometric chart?
Find the state point for the incoming cool air on the lower left portion of the psychrometric chart (point A in Figure 4). Note that other properties of the 40°F air include a wet-bulb temperature of 38°F, a dewpoint temperature of about 34°F and humidity ratio of 0.0042 lb moisture/ lb dry air.
