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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As you move your finger around the graph, the psychrometric properties at the top of the screen dynamically update. What is the dewpoint temperature of the air at 90 degrees Fahrenheit wet-bulb temperature and 80 degrees dry-bulb temperature? Understanding Psychrometrics serves as a lifetime reference manual and basic refresher course for those who use psychrometrics on a recurring basis and provides a four- to six-hour psychrometrics learning module to students; air-conditioning designers; agricultural, food carrifr, and industrial process engineers; meteorologists and others.

Wet bulb temperature is represented by the diagonal lines psychrometrif slope from right-to-left. 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.

If the air is cooled to 80 degrees Fahrenheit, what will be the relative humidity? I must warn you—I am going to get a bit technical, and you just might learn something at the end of this paper.

Notice that on the saturation curve the wet and dry bulb temperatures have the same values. What is the humidity ratio at this point? Load Calculation Applications Cafrier, 2nd ed.


The goal of an experienced ventilation professional is to use psychrometrics to ensure that the air is comfortably humidified so clients can live in comfort, as well as ppsychrometric easier. The four equations highlighted above were programmed in MATLAB and used to plot the simplified psychrometric charts shown above.


The major simplifying assumption in the construction of the chart is that the enthalpy of the mixture is assumed to be constant throughout the adiabatic saturation process psychromrtric in Section a. Also, create custom labels anywhere on the chart.

Experiment with chart at various intersections of humidity ratio and air temperature to perform your own calculations! Refer to this example:.

Psychometric points, processes and associated energy values are automatically calculated and plotted right on a professional psychometric chart. Gatley, 16 The most relevant gases that psychrometrics examine are air and water vapor, as controlling a water vapor-saturated environment is important in the fields of air ventilation, humidification, agriculture, meteorology, etc. Our built-in antivirus checked this download and rated it as virus free.

One of the most important tools within psychrometrics is the psychrometric chart, invented by Willis H. The program can output a listing of points and processes in a tabular report with calculated properties and energy values for each. Dry-bulb temperature is indicated on the x-axis of the psychrometric chart.

Thompson, 1 The vertical axis is humidity ratio, which indicates how much water vapor is present in the air although this is a ratio, think of it as a number value! Home Technical Resources Bookstore. Now, refer to the diagonal wet-bulb line of 68 degrees in the previous problem. Let me introduce another variable into the mix: The technical aspects of the modern psychrometric chart will be discussed below.

F18 Carrier Landing Simulation. Create an unlimited number of psychrometric chart projects. The humidity ratio of this point is approximately.

Psychrometrics Made Simple

Now, imagine a vertical line descending from the point to the dry-bulb temperature x-axis. Display a fully psychrometrlc psychrometric chart in both landscape and portrait modes. Thus with the aid of the chart we either heat or cool, add moisture or dehumidify as required in order to bring the air into the comfort zone.

The upmost, leftward-curved line in the psychrometric chart represents the maximum of water vapor that is present in the air at a given temperature. Czrrier addition, you can double-tap a point psychrometrix display the point properties and then edit them. Simplified, the amount of water vapor in the air. Human comfort in large part depends on air humidification—the amount of gaseous water vapor may be the difference between a dry, parched throat in the winter and a sweaty, muggy environment in the summer!


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

Once you are able to understand the mathematics of the chart, it will make measuring the humidity of your systems quite an easy process. Inputs are entered into the program through Windows standard interface with simple “point and click” operation.

The intersection of wet and dry bulb temperatures on the chart, together with the relative humidity line, can be used to determine all psychrometric properties of air. This is because the grass cools rapidly, and psychromstric in the surrounding air condenses at a rate greater than it can evaporate.

The latest installation package occupies The most popular chart in common usage is that developed by ASHRAE American Society of Heating, Refrigeration and Air-Conditioning Engineershowever we feel that the construction of a simplified version of the chart based on approximations of the various equations can be a very useful tool for developing an understanding of it’s usage.

Psychometric charting and process energy analysis software with unmatched chart presentation quality and accuracy. Other websites that we found interesting is that of Wikipedia on Psychrometrics.

The program on the CD allows cyart user to plot typical psychrometric processes and perform the corresponding energy calculations on-screen, without having to first print out the individual charts.