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. Industries that use these materials are concerned with relative humidity control in production and storage of such materials. The protractor on the upper left of the chart has two scales.
Humid heat is the constant-pressure specific heat of moist air, per unit mass of the dry air. Psychrometrics, psychrometry, and hygrometry are names for the field of engineering concerned with the physical and thermodynamic properties of gas-vapor mixtures.ĭisplay a fully customizable psychrometric chart in both landscape and portrait modes.
Retrieved from ” https: From Wikipedia, the free encyclopedia. Also, create custom labels anywhere on the chart. They are also available in low and high temperature ranges and for different pressures. The Mollier diagram coordinates are enthalpy and humidity ratio. Retrieved 18 September Some psychrometric charts use dry-bulb temperature and humidity ratio coordinates. The psychrometric ratio is an ashrrae property in the area of psychrometry, as it relates the absolute humidity and saturation humidity to the difference between the dry bulb temperature and the adiabatic saturation temperature. The “Mollier i – x ” Enthalpy – Humidity Mixing Ratio diagram, developed by Richard Mollier in ubits an alternative psychrometric chart, preferred by many users in Scandinavia, Eastern Europe, and Russia. The horizontal component of the condition line is the change in sensible heat while the vertical component is the change in latent heat. Molds and fungi can be controlled by keeping relative humidity low. Architectural acoustics Architectural engineering Architectural technologist Building services engineering Building information modeling BIM Deep energy retrofit Duct leakage testing Environmental engineering Hydronic balancing Kitchen exhaust cleaning Mechanical engineering Mechanical, electrical, and plumbing Mold growth, assessment, and remediation Refrigerant reclamation Testing, adjusting, balancing.Ĭart, in psychrometrics, the term quantifies the total volume of both the dry air and water vapour per unit mass of jnits air. The term dry-bulb is customarily added to temperature to distinguish it from wet-bulb and dewpoint temperature. PsychrometricsĪndroid app no longer available. Not to be confused with Psychometricsa discipline of psychology and education. This quantity is also known as the water vapor density.Ī psychrometric chart is a graph of the thermodynamic parameters of moist air at a constant pressure, often equated to an elevation relative to psychro,etric level. This is used to establish the slope of a condition line between two processes.
Psychrometrics Humidity and hygrometry Heating, ventilating, and air conditioning. Although the principles of psychrometry apply to any physical system consisting of gas-vapor mixtures, the most common system of interest is the mixture of water vapor and air, because of its application in heating, ventilating, and air-conditioning and meteorology. This program is provided for your use without charge. These lines are drawn straight, not always parallel to each other, and slightly inclined from the vertical position. At the end of the calculation, the user has the option to convert from the Psycjrometric to the SI or vice versa unit system.
Load Calculation Applications Manual, 2nd ed. This property of air-water vapor systems simplifies drying and cooling calculations often performed using psychrometic relationships. There appears to be error in the calculations when converting from one unit system to another. The dew point temperature is equal to the fully saturated dry bulb or wet bulb temperatures. ASHRAE Fundamentals Handbook (SI) Mass of water added per unit mass of dry air is (W.* – W), which. ASHRAE PSYCHROMETRIC CHART NO NORMAL TEMPERATURE.