Carrier Psychrometric Chart Pdf

A psychrometric process that involves the increase or decrease in the temperature of air without changing its humidity ratio Example: passing moist air over a. PSYCHROMETRIC CHART Linric Company Psychrometric Chart, www.linric.com.2.4.6.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4-40 0 10 20 25 30 35 40 45 50 55 60 65 70 75 80 85 100 105 DEW POINT - °F HIGH TEMP. BR0009-00 WATER VAPOR 7,000 grains = 1 lb. BR0009-00PsychChartHighTemp.pdf Author: USSATDeSa. Title: ASHRAE Psychrometric Chart #1 (SI) Created Date: 9/29/2011 3:30:29 PM. Psychrometric Chart Carrier.pdf 34wm2e9mr8l7. 115 120 Carrier 125 130 135 140 145 0,36 40 45 50 55 0,033 110 35 0,032 105 0,031% 0,029 0,028. Carrier Chart psychometric chart - Free download as PDF File (.pdf), Text File (.txt) or view presentation slides online. Scribd is the world's largest social reading and publishing site.

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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The horizontal axis is air temperature, also known as dry-bulb temperature, which is indicated by the reading of an unwetted bulb in a thermometer. Dry-bulb temperature cqrrier indicated on the x-axis of the psychrometric chart. No, it is not an offshoot of Scientology—thank goodness. In addition, you can double-tap a point to display the point properties and carrir edit them.

What is the dewpoint temperature of the air at 90 degrees Fahrenheit wet-bulb temperature and 80 degrees dry-bulb temperature?

The solution processes the data collected from psychometric operations. Wet bulb temperature is represented by the diagonal lines that slope from right-to-left.

Simplified, the amount of water vapor in the air. F18 Carrier Landing Simulation. Create psychrometric processes by plotting points then connecting them with process lines. You must be logged in to post a comment.

Carrier Psychrometric Chart Pdf Chart

Purchase Understanding Psychrometrics, 3rd ed. A tool used by engineers and ventilation professionals to determine psychrometric caerier such as the relative humidity, humidity ratio, and relative humidity.

A dry bulb air temperature thermometer reads degrees Fahrenheit and a wet bulb thermometer reads 68 degrees Fahrenheit. The air in contact with the windows will become colder until the dew point is reached. But, I can guarantee that possessing sound, theoretical knowledge of psychrometrics will help you understand more about how ventilation systems function, as well enable you to simplify the technical workings of the systems when talking to clients.

Carrier Psychrometric Chart Pdf Template

Thompson, 2 The technical nature of this early psychrometric chart is not very important for your understanding, as the modern psychroemtric chart chaft new variables, which will be explained later. The humidity ratio is the located on the vertical axis.

This program was originally created by Hands Down Software. How does a Psychrometric Chart Work? Also, you can create templates that you can reuse over and over again.

As you move your finger around the graph, the psychrometric properties at the top of the screen dynamically update. Type and press enter to search.

Greenheck Psychrometrics Science Tools. A cooling of air temperature represents a shift to the left. Both guides reduce the confusion by separately explaining 4 of the 6 sets of curves which make up a psychrometric 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.

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

Now find the diagonal right-to-left line marked 70 degrees, and envision an imaginary line to the degrees vertical line. Now, refer to the diagonal wet-bulb line of 68 degrees in the previous problem. Therefore, the carirer temperature of the air at 90 degrees Fahrenheit wet-bulb temperature and 80 degrees dry-bulb temperature is 75 degrees Fahrenheit. 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.

Gatley, 17 Carrier compiled chaart data to create a descendant of the Psychrometric Chart, called the Hygrometric Chart: Other websites that we found interesting is that of Wikipedia on Psychrometrics.

Create an unlimited number of psychrometric chart projects. 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.

Psychrometrics Made Simple – United Trades

The program can output a listing of points and processes in a tabular report with calculated properties and energy values for each. Want to teach an old HVAC dog some new tricks? Do you install ventilation systems with the skill and precision of Julia Child baking a chicken potpie? Thank you for rating the program! Home Technical Resources Bookstore. Load Calculation Applications Manual, 2nd ed. Note carriier curvature of the graph: Now, imagine a vertical line descending from the point to the dry-bulb temperature x-axis.

Overview Psychrometrics, at its core, is an area of engineering investigating the moist properties of air. Refer to this example:. Gatley, 17 Carrier compiled this data to create a descendant of the Psychrometric Chart, called the Hygrometric Chart:. The technical aspects of the modern psychrometric chart will be discussed below.

Psychrometrics

The dew point is the temperature below which the water vapor in air condenses into liquid water at the same rate carrier which it evaporates. Also, create custom labels anywhere on the chart. Psychometric charting and process energy analysis software with unmatched chart presentation quality and accuracy. 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.

Refer to this example:

Chapter 10: Air - Water Vapor Mixtures

b) The Psychrometric Chart andAir-Conditioning Processes

We notice from the development in Sectiona)that the equations relating relativeand specific humidity, temperature (wet and dry bulb), pressure (air,vapor) and enthalpy are quite tedious and inconvenient. For thisreason a PsychrometricChartrelating all the relevantvariables was developed which is extremely useful for designing andevaluating air-conditioning and cooling tower systems.

At first appearence the psychrometric chart is quiteconfusing, however with some practice it becomes an extremely usefultool for rapidly evaluating air-conditioning processes. The mostpopular chart in common usage is that developed by ASHRAE(American Society of Heating, Refrigeration andAir-Conditioning Engineers), however we feel that the construction ofa simplified version of the chart based on approximations of thevarious equations can be a very useful tool for developing anunderstanding of it's usage. This approach was suggested by MagedEl-Shaarawiin his article 'On thePsychrometric Chart' published in the ASHRAE Transactions (Paper#3736, Vol 100, Part 1, 1994) and inspired us to produce thefollowing simplified psychrometric chart:

The basic information used to construct the chart isthe water vapor saturation data (Tsat, Pg) which is obtained fromsteam tables over the range from Tsat = 0.01°C through 50°C. Thespecific humidity ω is then evaluated using the relative humidity φas a parameter to produce the various relative humidity curves (bluelines) as follows:

whereP is the standard atmospheric pressure 101.325 [kPa].

The saturation curve (100% relative humidity) alsoknown as the dew point curve is drawn as a redline. Notice that on the saturation curve the wet anddry bulb temperatures have the same values.

The major simplifying assumption in the constructionof the chart is that the enthalpy of the mixture is assumed to beconstant throughout the adiabatic saturation process (described inSectiona). This implies that the evaporatingliquid added does not significantly affect the enthalpy of theair-vapor mixture, leading to the constant slope wet bulb temperature/ enthalpy (red)lines defined by:

Notethat on the ω = 0 axis (dry air) h = T [°C]

Finally, the specific volume of the air-vapor mixture(greenlines)is determined from the ideal gas relation as

wherethe gas constant R_air=0.287 [kJ/kg.K]

It is normal practice to separate out the overlappingenthalpy / wet bulb temperature lines allowing them to be separatelyevaluated. Thus we introduce an oblique enthalpy axis and enthalpy(black) lines as follows:

The four equations highlighted above were programmedin MATLAB and used to plot the simplified psychrometric charts shownabove. Refer to the link:
MATLABprogram for plotting a Simplified Psychrometric Chart

An excellent NebGuide (University of Nebraska-LincolnExtension Publication) describing Howto use a Simplified Psychrometric Charthasbeen provided by David Shelton and Gerald Bodman. Another usefulguide provided by Mark Cartwright of the North Carolina ContractorTesting Institute (NCCTI) is the YouTube video: PsychrometricChart Simplified. Both guides reduce theconfusion by separately explaining 4 of the 6 sets of curves whichmake up a psychrometric chart. Definitely review both guides beforecontinuing.

Solved Problem 10.1 -Assumethat the outside air temperature is 32°C with a relative humidity φ= 60%. Use the psychrometric chart to determine the specific humidityω [18 gm-moisture/kg-air],the enthalpy h [78kJ/kg-air], the wet-bulb temperature T_wb[25.5°C],the dew-point temperature T_dp[23°C],and the specific volume of the dry air v [0.89m³/kg].Indicate all the values determined on the chart.

Carrier Psychrometric Chart Download

Solved Problem 10.2:Assumethat the outside air temperature is 8°C. If the air in a room is at25°C with a relative humidity φ = 40%, use the psychrometric chartto determine if the windows of that room which are in contact withthe outside will become foggy.

Theair in contact with the windows will become colder until the dewpoint is reached. Notice that under the conditions of 25°C and 40%relative humidity the dew point temperature is slightly higher than10°C, At that point the water vapor condenses as the temperatureapproaches 8°C along the saturation line, and the windows willbecome foggy.

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One of the major applications of the PsychrometricChart is in air conditioning, and we find that most humans feelcomfortable when the temperature is between 22°C and 27°C, and therelative humidity φ between 40% and 60%. This defines the 'comfortzone' which is portrayed on the Psychrometric Chart as shownbelow. Thus with the aid of the chart we either heat or cool, addmoisture or dehumidify as required in order to bring the air into thecomfort zone.

Carrier Psychrometric Chart High Temperature Pdf

Solved Problem 10.3:Outsideair at 35°C and 60% relative humidity is to be conditioned bycooling and heating so as to bring the air to within the 'comfortzone'. Using the Psychrometric Chart neatly plot the requiredair conditioning process and estimate (a) the amount of moistureremoved [11.5g-H20/kg-dry-air],(b) the heat removed [(1)-(2),q_cool= 48kJ/kg-dry-air],and (c) the amount of heat added [(2)-(3),q_heat= 10kJ/kg-dry-air].

Solved Problem 10.4:: Hotdry air at 40°C and 10% relative humidity passes through anevaporative cooler. Water is added as the air passes through a seriesof wicks and the mixture exits at 27°C. Using the psychrometricchart determine (a) the outlet relative humidity [45%],(b) the amount of water added [5.4g-H20/kg-dry-air],and (c) the lowest temperature that could be realized [18.5°C].

This type of cooler is extremely popular in hot, dryclimates, and is popularly known as a SwampCooler. An interesting application ofusing a swamp cooler to cool drinking water in extremely hotenvironments is described in the posting of Rich Oppel in the At Warblog of the New York Times: 'DrinkingFrom Socks'.

An interesting and informative description onPsychrometricChart Usefor livestock and greenhouseapplications has been presented in a PennState Extension website byEileen E. Fabian. Other websites that we found interesting is that ofWikipediaon Psychrometrics.