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These charts focus on the carriier of temperatures most suitable for comfort-cooling HVAC applications, and include the Trane coil curves, which depict the condition of the air leaving a cooling coil.

The area of engineering investigating the moist properties of air. Notice where they meet on the graph. 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.

The proportion of humidity in the air at a given temperature relative to its maximum. Thompson, 2 The technical nature of this early psychrometric chart is paychrometric very carrirr for your understanding, as the modern psychrometric chart incorporates new variables, which will be explained later. Version 7 is HERE!! Click Here for Version 7 Details!! Now, imagine a vertical line descending from the point to the dry-bulb temperature x-axis.

The program utilizes the classic VenmarCES Psychrometric Chart and allows for plotting of state points, cooling coil process modeling and connection of any two state points desired. Complete projects can be saved and retrieved with standard File-Open-Save menu structure.

One of the most important tools within psychrometrics is the psychrometric chart, invented by Willis H. There is a recap of the technical terms introduced in this paper below. A cooling of air temperature represents a shift to the 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 you do, you should probably know something about psychrometrics. Now, refer to the diagonal wet-bulb line of 68 degrees in the previous problem. Therefore, the dewpoint temperature of the air at 90 degrees Fahrenheit wet-bulb temperature and 80 degrees dry-bulb temperature is 75 degrees Fahrenheit.

The humidity ratio of this point is approximately. Thompson, 3 Humidity ratio: Type and press enter to search. Feel free to download and test drive this great tool, which is FREE!! Indicated on the diagonal lines sloping from right-to-left on the psychrometric chart, wet-bulb temperature represents the reading of a thermometer with a wetted cotton wick around the bulb. Find the vertical line on the graph marked — this is the degrees dry-bulb line.

### Psychrometric Calculator Chart Analysis Software Program for Engineers

What is the dewpoint temperature of the air at 90 degrees Fahrenheit wet-bulb temperature and 80 degrees dry-bulb temperature? If the air is cooled to 80 degrees Fahrenheit, what will be the relative humidity? You must be logged in to post a comment. What is important to note, however, is that psychrometrics has a long, storied history of over one hundred years, and has been a vital mainstay of the air conditioning trade.

Conclusion Experiment with chart at various intersections of humidity ratio and air temperature to perform your own calculations! Represented by the sloping left-to-right lines in the chart possessing percent values.

## Psychrometrics Made Simple

The psychrometric chart psychromrtric is simply exquisite, combined with advanced psychrometric methodologies providing unmatched accuracy. 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.

The goal of an experienced ventilation professional is to use psychrometrics to ensure that the air is comfortably humidified so clients can live in pschrometric, as well as breathe easier. Note the curvature of the graph: The chart and your plotted systems can be simply copied to the clipboard allowing you to paste it directly into your presentations, proposals or e-mails.

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