![how to read ashrae psychrometric chart how to read ashrae psychrometric chart](https://s3.amazonaws.com/greenbuildingadvisor.s3.tauntoncloud.com/app/uploads/2018/08/08044227/psychrometric-chart-quantities-carrier-main-700x539.jpg)
Together, they cited information from 12 referenceswhich can be found at the bottom of the page. Humidity ratio is usually expressed as mass of moisture per mass of dry air pounds or kilograms of moisture per pound or kilogram of dry air, respectively. Psychrometrics, psychrometry, and hygrometry are names for the field of engineering concerned with the physical and thermodynamic properties of gas-vapor mixtures.įor this reason a Psychrometric Chart relating all the relevant variables was developed which is psychrometrjc useful for designing and evaluating air-conditioning and cooling tower systems. The thermodynamic wet-bulb temperature is a thermodynamic property of a mixture of air and water vapor. This page was last edited on 3 Decemberat The psychrometric chart allows all the parameters of some moist air to be determined from pshchrometric three independent parameters, one of which must be the pressure. Tips Before you begin to read the chart, make note of the units of measurement used in each scale. The region above the saturation curve is a two-phase region that represents a mixture of saturated moist air and liquid water, in thermal equilibrium. The inner scale represents sensible-total heat ratio SHF. What is Psychrometric Chart? Introduction to Reading the Psychrometric Properties of Air In human terms, our thermal comfort is in large part a consequence of not just the temperature of the surrounding air, but because we cool ourselves via perspiration the extent to which that air is saturated with water vapor.Ī simplified definition is the temperature at which the water vapour turns into “dew” Chamunoda Zambuko Retrieved from ” https: Molds and fungi can be controlled by keeping relative humidity low.
![how to read ashrae psychrometric chart how to read ashrae psychrometric chart](https://www.ohio.edu/mechanical/thermo/Applied/Chapt.7_11/Psychro_chart/psych_ex10.4.gif)
Visualize 2 measurements by comparing them on the chart. So the temperature value that allows this process condensation to take place is called the ‘dew point temperature’. Heating, ventilation and air conditioning. The constant Ihbe temperature lines are the diagonal lines extending from WB temperature curved scale downwards towards the right hand side of the chart. The mass of water vapor per unit volume of air containing the water vapor.
#HOW TO READ ASHRAE PSYCHROMETRIC CHART HOW TO#
How to Read a Psychrometric Chart: 11 Steps (with Pictures) Knowing both the dry-bulb temperature DBT and wet-bulb temperature WBTone can determine the relative humidity RH from the psychrometric chart appropriate to the air pressure. As the relative humidity increases at a certain temperature, the specific volume of the air also increases. Along this line, note that the wet bulb temperature and the dew point are always equal to the dry ihev temperature. Each line represents a constant temperature. Locate the vapor pressure line to the right of the dew point line. Locate the uppermost curved line pxychrometric the chart to find the saturation curve. Chapter 10b: The Psychrometric Chart (Updated 7/22/)Ī 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. Archived copy as title Webarchive template wayback links. Since the dew point temperature of the air depends on the moisture content of the air, constant moisture lines are also constant DP temperature lines. Use a ruler to extend these measurements into the chart. It may be evaluated with the following equation: The Mollier diagram coordinates are enthalpy and humidity ratio. m wide x m long, and the boards are separated by. Use chart to analyze processes involving moist Psychrometric chart: Example 1. The ASHRAE-style psychrometric chart, shown here, was pioneered by. Psychrometrics, psychrometry, and hygrometry are names for the field of engineering. A convenient, precise and customizable psychrometric chart & calculator tool for 25 26 27 28 29 30 m^3/kg(d.a) 10% 20% 30% 40% 50% 60% 70%.