very high temperature psychrometric chart

High relative humidities create moist environments. It is expressed as a percentage, and helps to determine the level o f indoor comfort that exists in the various rooms of a house or other conditioned space. RH is the ratio of the amount of moisture present in the air to the amount it can hold at saturation. For field service, these temperatures are frequently used to find the relative humidity (RH) of a conditioned space. Using the easily-measured values of dry bulb and wet bulb temperatures taken with a psychrometer, the psychrometric chart can be used to find the value for one or more of the remaining properties of a given sample of conditioned air. They are also available in metric (SI) form. The psychrometric chart (Figure 1-35) is used to determine how each of the following air properties varies as the amount of moisture in the air changes:Ĭharts are available that graph the air properties at low temperatures (-20 to 50° F), normal temperatures (20 to 110° F), and high temperatures (60 to 250° F) at sea level and at various elevations to correct for changes in barometric pressure. For a review of psychrometric theory and instructions for using the psychrometric chart, refer to the many HVAC-related textbooks and other materials that are readily available. A brief description o f the psychrometric chart and a discussion of some of its more common uses in servicing HVAC systems will be provided here. Psychrometric charts show the relationships o f these air properties graphically. Control o f these properties is essential for human comfort, optimum equipment operation, and to prevent damage to home furnishings. Psychrometrics is the study of air and its properties, including temperature, pressure, moisture, and other characteristics.

Very high temperature psychrometric chart