Willis H Carrier. Father of Air Conditioning. R V Simha. Keywords. W H Carrier, rational psychro- metric formulae, psychrometric chart, invention of centrifugal. PSYCHROMETRIC CHART. ▫ Identify parts of the chart. ▫ Determine moist air properties. ▫ Use chart to analyze processes involving moist air. 35 40 45 50 0,36 55 Carrier PSYCHROMETRIC CHART NORMAL.

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Chapter 10b: The Psychrometric Chart (Updated 7/22/)

Easily plot HVAC and other psychrometric processes while out in the field, save the graphs, and then email the graph and results to yourself or clients. What is the dewpoint temperature of the air at 90 degrees Fahrenheit wet-bulb temperature and 80 degrees dry-bulb temperature? No, it is not an offshoot of Scientology—thank goodness.

Note the curvature of the graph: The four equations highlighted above were programmed in MATLAB and used to plot the simplified psychrometric charts shown above. This program was originally created by Hands Down Software. The technical aspects of the modern psychrometric chart will be discussed below.

Type and press enter to search. The program on the CD allows the user to plot typical psychrometric processes and perform the corresponding energy calculations on-screen, without having to first print out the individual charts. Home Technical Resources Bookstore. For this reason a Psychrometric Chart relating all the relevant variables was developed which is extremely useful for designing and evaluating air-conditioning and cooling tower systems. This defines the “comfort zone” which is portrayed on the Psychrometric Chart as shown below.


The latest installation package occupies A dry bulb air temperature thermometer reads degrees Fahrenheit and a wet bulb thermometer reads 68 degrees Fahrenheit. The program can output a listing of points and processes in a tabular report with calculated properties and energy values for each. If you do, you should probably know something about psychrometrics.


The air in contact with the windows will become colder until the dew point is reached. We notice from the development in Section a that the equations relating relative and specific humidity, temperature wet and dry bulbpressure air, vapor and enthalpy are quite tedious and inconvenient. Also, you can create templates that you can reuse over and over again.

Now, imagine a vertical line descending from the point to the dry-bulb temperature x-axis. Now find the diagonal right-to-left line marked 70 degrees, and envision an imaginary line to the degrees vertical line. Therefore, the dewpoint temperature of the air at 90 degrees Fahrenheit wet-bulb temperature and 80 degrees dry-bulb temperature is 75 degrees Fahrenheit. Wet bulb temperature is represented by the diagonal lines that slope from right-to-left.

There is a recap of the technical terms introduced in this paper below. Thank you for rating the program! Other websites that we found interesting is that of Wikipedia on Psychrometrics. Here is a modern version of the psychrometric chart: Psychrometeic proportion of humidity in the air at a given temperature relative to its maximum.

Inputs are entered into the program through Windows standard interface with simple “point and click” operation. Also, create custom labels anywhere on the chart. If the air is cooled to 80 degrees Fahrenheit, what will be carrjer relative humidity? Also known as air temperature, the reading of an unwetted bulb in a thermometer.


Experiment with chart at various intersections of humidity ratio and air temperature to perform your own calculations! The suite features customizable presentation parameters and offers editing tools for the input content adjusting the charts in real time.

Are you a heating and air conditioning professional?

A tool used charrt engineers and ventilation professionals to determine psychrometric values such as the relative humidity, humidity ratio, and relative humidity.

As you move your finger around the graph, the psychrometric properties at the top of the screen dynamically update. 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. The dew point is the temperature below which the water vapor in air condenses into liquid water at the same rate at which it evaporates.

Find the vertical line marked Psychometric points, processes and associated energy values are automatically calculated and plotted right on a professional psychometric chart. An interesting application of using a swamp cooler to cool drinking water in extremely hot environments is described in the posting of Rich Oppel in the At War blog of chxrt New York Times: Finally, the specific volume of the air-vapor mixture green lines is determined from the ideal gas relation as.

Display a fully customizable psychrometric chart in both landscape and portrait modes. Simplified, the amount of water vapor in the air.

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