ashrae psychrometric chart si units pdf
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Ashrae Psychrometric Chart Si Units Pdf Download

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The psychrometric chart is a graphical representation of how the saturation, vapor pressure and temperature of moist air vary. This chart can be found on the ASHRAE website and is one of the most widely accepted tools for designing and analyzing heating, ventilating and air conditioning (HVAC) systems. The psychrometric chart also gives you an idea about how much moisture there is in the air at different temperatures as that determines what type of dehumidification or humidification equipment you will need to install in your building. The psychrometric chart was created by George Thompson in 1928. At that time, the only available technology was the hot-air furnace for heating which used about 600 gallons of fuel per day. The tank size varied considerably. Most houses at that time had a fuel tank which held 4 to 6 thousand gallons of water with about 120 pounds of salt mixed in with the water to prevent corrosion. This meant that most households had about 4,000 pounds of water every day. This water was collected in a tank for daily use and when it evaporated, it collected in the bottom of the tank. The tank was vented to the outdoors so the water could evaporate and mix with outside air. The psychometric chart is also known as the saturation-humidity chart, the wet-bulb depression-dew point chart, and the Thompson chart. The psychrometric chart is used in industrial processes for determining how much water is in an industrial process or system. For example, one process that uses this tool is called freeze drying where they freeze produce at very low temperatures, then remove all of the ice (water). The dry (salt) product can then be stored more easily than frozen produce. For air conditioning, the chart is used to determine when a building may have a mold problem, a microbial problem or a health problem. An example of that is when the outdoor air temperature in an area is between 40 and 50 degrees Fahrenheit, and the humidity indoors is at 70%, you will get condensation on the windows inside if there are no dehumidification systems installed in these buildings. The psychrometric chart gives us two different ways to measure how much water vapor is in the air: saturation and dew point. Saturation describes what percent of water vapor there is in the room, given that it's not cooled any more. A saturation of 100% means that all the water in the room is present as water vapor and can evaporate at room temperature. Saturation is an arbitrary measurement because there is no such thing as a pure state of water vapor. Dew point on the other hand is a more precise measurement of how much moisture there is in the air and it's based on the freezing-point depression or pressure depression between two points for which you want to know how much water there is in the air. The dew point is given at 40 degrees Fahrenheit, unless otherwise stated by an official publication, e.g., ASHRAE Handbook series, so I always use 40 degrees Fahrenheit to measure dew point.

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