Psychrometric Chart

What is Psychrometric Chart?

A psychrometric chart is a graphical representation of the thermodynamic properties of moist air. It shows the relationships between temperature, humidity, dew point, and other parameters. These charts are commonly used by engineers and HVAC professionals to analyze and design air conditioning and ventilation systems.

What are the types of Psychrometric Chart?

There are several types of psychrometric charts available, each designed for specific applications. Some common types of psychrometric charts include: 1. Mollier Chart: This chart displays enthalpy as a function of temperature and humidity ratio. 2. Carrier Chart: Developed by Carrier Corporation, this chart is widely used in the HVAC industry. 3. Trane Chart: Created by Trane Company, this chart is commonly used for air conditioning and refrigeration calculations. 4. ASHRAE Psychrometric Chart: Published by the American Society of Heating, Refrigerating and Air-Conditioning Engineers, this chart is widely accepted and used in the industry.

Mollier Chart
Carrier Chart
Trane Chart
ASHRAE Psychrometric Chart

How to complete Psychrometric Chart

Completing a psychrometric chart involves the following steps:

01
Determine the dry-bulb temperature and wet-bulb temperature of the air.
02
Calculate the humidity ratio or specific humidity using the given temperature and relative humidity.
03
Plot the data points on the psychrometric chart using appropriate scales.
04
Connect the data points to create the appropriate lines or curves on the chart.
05
Interpolate between the lines or curves to find the unknown properties of the air.
06
Repeat the above steps for additional data points if needed.

By following these steps, you can accurately analyze and understand the properties of moist air using a psychrometric chart.

Video Tutorial How to Fill Out Psychrometric Chart

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Questions & answers

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.
0:59 3:43 Psychrometric Chart Simplified.flv - YouTube YouTube Start of suggested clip End of suggested clip Dry bulb is represented by the vertical lines the values are on the bottom of the chart wet bulb isMoreDry bulb is represented by the vertical lines the values are on the bottom of the chart wet bulb is used in further mental water moisture in the air. It's just a measurement of the evaporation.
0:53 6:25 Psychrometric Chart - How to draw - YouTube YouTube Start of suggested clip End of suggested clip So first we draw a horizontal line. And then a vertical line on the right hand side. And extend itMoreSo first we draw a horizontal line. And then a vertical line on the right hand side. And extend it at the top with a horizontal. And then draw a curve on the left hand side.
Reading A Psychrometric Chart Dry Bulb Temperature: the axis along the bottom. Humidity Ratio and Vapor Pressure: the right axis. Saturation Temperature or Dew Point: the curved left axis. Enthalpy: the slanted left axis. Relative Humidity: the lines that curve up from left to right.
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.
Download psychrometric functions Addin for Excel Once installed, if you click on 'insert function' and select the 'user-defined' category. You can find a list of the available psychrometric functions: With this fantastic plug-in installed, plotting a psychrometric chart is straightforward.