figure (circled in blue). See the below

Say if the air is cooled from 100oF to 75oF, all we have to do is draw the horizontal line to locate the initial and final condition of the air.A psychrometric chart is very useful in carrying out heat load or cooling load calculations.Book: Basic Refrigeration and Air Conditioning by P N AnanthanarayanThis is the series of articles that describes psychrometric chart and various psychrometric processes like sensible heating, sensible cooling, humidification, de-dumidification, evaporative cooling etc.The Importance of Coal Analysis to Boiler DesignersTurbocharger design: Construction and working of turbochargers Indicate all the values determined on the chart. The constant enthalpy lines extend from the enthalpy scale down toward the right side of the chart.

Therefore we can identify the related point(X) using temperature (28In an experiment, following air characteristics are known.We know two values( dry bulb temperature, absolute/specific humidity ). temperature (28Check the two relative humidity curves which lies of intersection point of dry bulb Volume.

By using psychrometric charts HVAC engineers can graphically analyze different types of psychrometric processes and find solution to many practical problems without having to carry out long and tedious mathematical calculations. Copyright © 2020 Bright Hub PM.

You can calculate relative humidity now using those distances. air such as, the Example: When dry bulb temperature and wet bulb temperature of air are known, we can calculate absolute humidity, relative humidity and enthalpy.In this tutorial we first study axes of psychrometric chart, then questions and examples are discussed.

The constant enthalpy line passing through the given value of the WB temperature indicates the enthalpy of the air.The specific volume of air is an important parameter since one has to consider the amount of air to be handled by the cooling coil, cooling fan, etc and accordingly the rating of cooling coil and fan has to be found out. To find the value of the enthalpy of the any given air, one should know its WB temperature.

In the first part of this The RH lines are the curves extending from the lower left to the upper right part of the psychrometric chart. The different curves of RH indicate different values of humidity measured in percentage. Properties of atmospheric So we cannot use this psychrometric chart to find relative Identify those two curves 50% and 60% respectively. Use the psychrometric chart to determine the specific humidity ω [18 gm-moisture/kg-air], the enthalpy h [78 kJ/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 [0.89m 3 /kg]. Free online Psychrometric Calculator . In this example we know values of dry bulb From the psychrometric chart we can find out the specific volume of the required air and find the total volume of the required air by multiplying it with the total weight of the air required. The value of RH reduces from left towards right. Along the saturation curve all the three temperatures, the DB, WB and DP are same.The total enthalpy of the air comprises of the sensible heat and the latent heat. That axis is highlighted(black) in the figure.Some of humidity curves parts are highlighted(red) in the figure.Enthalpy line is divided into several parts. The "Psychrometric Calculator" is based on the formulations developed by Hyland and Wexler. humidity h enthalpy Tw wet bulb sp.

Properly study axes of psychrometric chart with figures and get an idea, where different axes are located.

kJ/kg dry air. If design pressure (total pressure) of psychrometric chart

temperature (28Draw an inclined line parallel to the enthalpy lines trough intersection point of dry bulb The specific volume of this air is 13.7 ft3/lb and the enthalpy of air is 30 Btu/lb.If all the values are calculated manually using the formulae, it takes lots of time, but with a psychrometric chart these values can be found within seconds or minutes.With a psychrometric chart we can easily find out the present and the final condition of the air. The enthalpy scale in the psychrometric chart is located outside the main body. You can convert your data with a simple click and discover the impacts on temperature and pressure.

They indicate the value in either m3/kg or ft3/lb.If any of the two values from DB, WB, DP temperature and the relative humidity are known, all other values can be easily found from the psychrometric chart, without having to carry out any calculations.Consider an example of air where the given values of DB and WB temperature are 78 degrees F and 65 degrees F respectively. T dry bulb rH rel.humidity TDP dew point W abs. Hyland and Wexler presented the equation of state in: Properties of atmospheric air such as, the dry-bulb temperature, the wet-bulb temperature, the dew-point temperature, the specific humidity, the relative humidity, specific enthalpy and specific volume are discussed in relation to the psychrometric chart below.. Two independent intensive properties are required to completely specify the state of air in the psychrometric chart.


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