psychrometry: Fundamentals of Psychrometry (part III) - 02/24/10 12:37 AM Evaporation    Evaporation is the process of expelling moisture from materials into the air.  Moisture converts from a liquid state on a material's surface into a gaseous state as water vapor.  Air movers enhance the evaporation process by introducing airflow at the surface level of materials.  The airflow causes moisture to pass from surfaces into the air as vapor.  Airflow then replaces this highly saturated air with the dryer air produced by dehumidifiers removing water vapor from air.  Increases in temperature also increase evaporation, since warmer air can hold more moisture. Dehumidification    Dehumidification is the process of removing or extracting … (1 comments) psychrometry: Fundamentals of Psychrometry (part II) - 02/18/10 12:28 AM Here are some other terms you should get accustomed to... Dew Point    The temperature at which water vapor begins to condense is known as the dew piont.  When air is saturated with water vapor, a drop in temperature forces the air mass to release some of its moisture in the form of condensation.  For example, on a warm humid morning the windows of a car are covered with dew or water droplets.  The glass is cold enough to cool the air contacting the glass to the dew point, resulting in condensation.  When drying a structure, you must never allow the … (0 comments) psychrometry: Fundamentals of Psychrometry - 02/17/10 12:32 AM Understanding psychrometry is easier if you are familiar with the fundamentals involved in measuring air conditions.  Grains Per Pound (GPP)    "Grains per pound" (gpp) is the unit used to measure the weight of moisture in air.  The number of grains per pound of dry air expresses the specific humidityof the air.  Stated another way, specific humidity expresses the weight (in number of grains) of the moisture present in a pound of air.  To determine the "grains per pound" of current air conditions, you must plot the temperature of air and the relative humidity of air on a psychrometric chart.  The … (10 comments) psychrometry: Psychrometry - 02/16/10 12:14 AM    Psychrometry is the study of the air and its properties.  The properties of temperature, humidity, vapor pressure and dew point are measured to evaluate air conditions and determine whether intervention is needed to prevent damage to materials.  Psychrometrics (another name for "psychrometry") evaluates how these properties of air relate to the effects that moisture has on various structural materials and contents.    Water damage restoration professionals need a thorough understanding of psychrometrics to dry a structure and its contents effectively.  Water damages materials in two ways: (1) from absorption of water in direct contact with materials and (2) from absorption … (1 comments)

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