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#Carrier psychrometric chart download farenhiet how to

Vapor Pressure – Vapor pressure is measured in inches of mercury and represents the pressure exerted by water vapor in air.

Relative Humidity – This refers to the percentage of water vapor per pound of dry air in relation to how much the air can hold at its current temperature.

Moisture Content – Also known as the humidity ratio, this is the total weight of water vapor per pound of dry air.

Latent Heat Flow – 60(latent heat of vaporization of water in Btu/lb (970 at sea level))(density of air in lb/ft³)(air flow in ft³/min)(humidity ratio difference in lb water/lb dry air).

Sensible Heat Flow – 60(specific heat of air in Btu/lb ✯ (0.24 at 72✯))(density of air in lb/ft³)(air flow in ft³/min)(| supply air temperature – conditioned room temperature |).

Sensible Heat Ratio – This is the total sensible heat flow divided by the total heat flow.

Enthalpy is measured by Btu (British thermal unit) per pound of dry air.

Enthalpy – This is the measurement of heat energy.

This refers to the amount of space air occupies per pound of weight. Specific Volume & Density – Specific volume is measured in cubic feet per pound.Dew Point – At this temperature, moisture starts condensing from the air.Wet Bulb – This is a typical thermometer’s standard reading if the sensing bulb is covered with a wet wick or sock and exposed to air flow.High temperatures that range from 60 degrees FDB to 250 degrees FDB.Normal temperatures that range from 20 degrees FDB to 100 degrees FDB.Low temperatures that range from -20 degrees FDB to 50 degrees FDB.You can find a psychrometric chart that offers these temperature ranges: Dry Bulb – This is the temperature reading found on a typical thermometer.What Are the Parts of a Psychrometric Chart?Ī psychrometric chart consists of eight standard parts, including:

#Carrier psychrometric chart download farenhiet how to

Knowing how to read a psychrometric chart is a wise skill for engineers to have in the event that technology fails or isn’t available. While there are online calculators and applications to help make calculations, using the chart correctly provides engineers with a more accurate reading as long as you know two parameters of air. The Benefits of Using a Psychrometric Chart CorrectlyĪ psychrometric chart prevents engineers from spending time on tedious mathematical formulas. If you know two parameters of air where the lines will cross each other, the psychrometric chart can do the rest of the work for you.

While this chart looks complicated and even intimidating, it’s actually quite helpful and simple to understand once you grasp the basic properties of air. With this chart, engineers can better assess psychrometric processes and find practical solutions. A psychrometric chart represents the psychrometric properties of air.