Relative humidity is labeled by point 9 on the graph. Specific volume of dry air is the total volume of air with no water vapor per cubic feet per pound. On this graph, it is measured in cubic feet per pound of dry air. Point 8 is labeled as the specific volume of dry air. The wet bulb temperature measures " the temperature of the adiabatic saturation." The wet bulb temperature is measured in degrees Fahrenheit. The wet bulb temperature is represented on the graph at Point 7. Saturation temperature is the temperature at which a liquid boils at a fixed pressure. The saturation temperature on this graph is measured in degrees Fahrenheit. Point 6 on the graph is saturation temperature. This is measured in BTU (British thermal unit) per pound of dry air.
Enthalpy is a quantity that is equal to the total heat content of a system. Humidity ratio is expressed by " the ratio between the actual mass of water pressure present in moist air to the mass of the dry air."Įnthalpy is Point 5 on the chart. The humidity ratio is measured in grains of moisture per pound of dry air. Point 4 on the graph represents the humidity ratio. The dew point is the " temperature at which water vapor starts to condense out of the air." The dew point is measured vertically and usually measured in degrees Fahrenheit or degrees Celsius, on this chart it is measured in Fahrenheit. The dew point is represented on the chart by Point 3. For this specific graph, it is measured in inches of mercury. Vapor pressure is measured in units of mercury. Vapor pressure is located at Point 2 on the graph. Dry bulb temperature is " basically the ambient air temperature." This element is measured in degrees Fahrenheit or degrees Celsius, while this specific one is measured in Fahrenheit. The dry bulb temperature is Point 1 on the graph. When given any two points on two different axes, all other components of the graph can be found. With this one graph, you will be able to configure nine different vital elements. Starting at one, they’re labeled as follows, respectively: Starting at the basics, there are nine different axes, which are categorized one through nine in the graph. To correctly read a psychrometric chart, here is a breakdown and visual representation.
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So why is it important to know how to read a psychrometric chart? Psychrometric charts allow you to track and monitor the physical and thermodynamic properties of gas-vapor mixtures. With so many lines and axes, you can get lost trying to follow the chart and find out which line represents which axis. Just taking a look at it, you may already be confused. Psychrometric charts can be pretty tricky to interpret.
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