specific volume psychrometric chart

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A psychrometric chart is a graph of the thermodynamic parameters of moist air at a constant pressure, often equated to an elevation relative to sea level. The enthalpy scale in the psychrometric chart is located outside the main body. The constant specific lines start from the saturation curve and drop down with the slight angle to the vertical lines.

Specific volume. So volume occupied for 1kg of mass is much higher than solids and liquids.Specific volume of air in psychrometric chart is defined as the number of cubic meters occupied by one kilogram of a Constant specific volume lines on psychrometric chart are inclined and they have a On one constant specific volume line, unit is written as When we find a point where two air properties are known, we can calculate specific volume. There is 4.6 kg of dry air.

The value of RH reduces from left towards right. When two air properties are known except specific volume, specific volume can be The extreme left curve along the shoe indicates RH of 100% and is also called the saturation curve because the condition of air along this line is fully saturated no matter what the DB and WB temperatures are. So units of specific volume is m 3 kg-1. Specific volume = volume / mass of dry air. 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]. Here we are going to calculate 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.

It depicts these parameters and is thus a graphical equation of state. We will find out various values from these given values of DB and WB temperatures.On the psychrometric chart locate value 78oF on the DB temperature scale located at the bottom of the chart.Locate WB temperature of 65oF on the saturation curve scale.Extend the vertical line (constant DB temperature line) from 78o and the diagonal line (constant WB temperature line) from 65oF and get the point of intersection of the two lines, which indicates the condition of the given air.Find out the values of various parameters at this point. 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. 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. volume line, we have to draw a constant specific line parallel to the other constant specific volume lines through that point.A psychrometer shows its dry bulb temperature as 25Specific volume of left side constant specific volume line is 0.86 mFrom distance measuring, ratio of x:y is approximately 2:3 .So now we can find the specific volume from those data

To find the value of the enthalpy of the any given air, one should know its WB temperature. It is measured by cubic feet per pound. There are inclined lines of constant specific volumes.

Air contains gases and water vapor. 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 different curves of RH indicate different values of humidity measured in percentage. The relative humidity line passing though this point indicates RH of 50%.

The parameters are: The formulations used here to calculate moist air properties are based on perfect gas relations published in 1989 ASHRAE Fundamentals Handbook, which should be accurate. For other pressures, relevant corrections have to be applied. If this point does not lie on a constant specific

All the properties of air indicated in the psychrometric chart are calculated at standard atmospheric pressure.

If a room occupy 5 m 3 of volume. [1] X Research source Each labeled temperature will have one vertical line extending from the axis. Understanding psychrometric charts can help you visualize environmental control concepts, such as why heated air can hold more moisture or, conversely, how allowing moist air to cool will result in condensation. The psychrometric chart ... (represented by lines sweeping upward from left side of chart) 5. The constant specific lines start from the saturation curve and drop down with the slight angle to the vertical lines. The psychrometric chart looks like a shoe. 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 ASHRAE-style psychrometric chart, shown here, was pioneered by Willis Carrier in 1904. Specific volume represents the volume per unit mass of air. Psychrometric Calculations. specific volume using psychrometric chart. The horizontal, or “X” axis, of the chart denotes the various temperature readings in Fahrenheit or Celsius. The constant enthalpy lines extend from the enthalpy scale down toward the right side of the chart. It can be very helpful in troubleshooting and finding solutions to greenhouse or livestock building environmental problems.

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