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Examine the psychrometric chart of Figure 386.3 and find the humidity ratio on the right hand side of the chart. Move horizontally to the right from the point that describes the conditions of the air and read the value. This psychrometric chart gives humidity ratio in pounds (lbs) of water per pound of dry air. For the conditions
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This guide is an easy 8 step framework designed to demystify the psychrometric chart: Step 1. Locate the dry bulb tem-perature along the bottom axis and the associated vertical line for each temperature. This scale will be in degrees F or degrees C. Step 2. Locate the 'humidity ratio' along the right vertical axis.
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Computer algorithms for psychrometric calculations have been published, and several microcomputer programs are available that incorporate psycrometric calculation. 11.5 PROCESSES ON THE PSYCHROMETRIC CHART Many HVAC processes can be represented as straight lines connecting two or three state points on the psychrometric chart.
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HVAC - Heating, Ventilation, and Air conditioning. Psychrometrics -The behavior of mixtures of air and water vapor under varying conditions of heat. Enthalpy = Total heat in the air = Sensible plus Latent heat. Sensible Heat - Changes in temperature that do not alter the moisture content of air. Latent Heat - Related to level of.
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Psychrometric Properties using the Chart 7 Given: Moist air mixture in our classroom; T, T wb measured with a sling psychrometer. Find: The following psychrometric properties of the mixture using the Psychrometric Chart (a) relative humidity (b) humidity ratio (c) specific enthalpy (d) specific volume (e) dew point temperature T I h# Z T dp T wb v
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The psychrometric chart below is made for standard atmospheric conditions. English (Imperial) units with wet bulb and dry bulb temperature and relative humidity. Open the printable pdf file - Psychrometric Chart - Barometric Pressure 29.921 inches of Mercury. The psychrometric chart is made with the PsycPro software available from www.linric.com.
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Psychrometric charts are printed mostly for sea level atmospheric pressure. Since virtually all psychrometric air processes involving HVAC design occur within a 30o F and 120oF range, most psychrometric charts only show this range as a practical measure. Psychrometric properties are also available as data tables, equations, and slide rulers.
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A psychrometric chart is an attempt to show the relationships in many of the properties of moist air. The chart shows all of the following properties: dry bulb temperature, wet bulb temperature, relative humidity, dew point temperature, humidity ratio, total heat (enthalpy) and specific volume. If any two of the listed properties are known.
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For a 10,000 cubic feet per minute system, the weight of the air passing through is: 10,000 ÷ 14 = 714.3 pounds per minute. The weight of the moisture added is: 714.3 x 0.0099 = 7.07 pounds per minute of moisture. Since one gallon of water weighs 8.34 pounds, the moisture to be added is as follows:
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PSYCHROMETRIC CHART BAROMETRIC PRESSURE 29.921 inches of Mercury Linric Company Psychrometric Chart, www.linric.com.1.2.3.4.5.6.7.8.9 1 1.1 1.2 1.3 VAPOR PRESSURE - INCHES OF MERCURY-20 0 10 20 25 30 35 40 45 50 55 60 65 70 75 80 85 DEW POINT - °F. Created Date:
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horizontal in psychrometric chart • Zero SHF line - vertical on psychrometric chart - No Sensible heat • SHF = 0.75 to 0.8 common in Air conditioning practice - at normal dry climate. • A lower value of SHF such as 0.65 - implies a high latent heat load - common in a humid climate
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-20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 dry bulb temperature - °c 5 10 15 20 25 30 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 110
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remains that the Psychrometric Chart can be difficult to comprehend. In order to provide a solution to this problem and enrich the user-experience of Climate Consultant 4.0, the authors created an audio and graphic tutorial application which explains the Psychrometric Chart and its relation to thermal conditions.
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Psychrometrics 6.3 Table 2 Thermodynamic Properties of Moist Air at Standard Atmospheric Pressure, 101.325 kPa Temp., °C í Humidity Ratio,
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Fig. 8.27 Psychrometric chart . Title: Slide 1 Author: McGraw-Hill Created Date: 2/22/2008 9:21:43 AM
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The psychrometric chart conveys an amazing amount of information about air. It provides an invaluable aid in illustrating and diagnosing environmental problems such as why heated air can hold more moisture, and conversely, how allowing moist air to cool will result in condensation. To predict whether or not moisture condensation will
