Psychrometric charts Grosvenor chart

The humidity chart or psychrometric chart is a convenient plot for representing the properties of mixtures of a permanent gas and a condensable vapor. There are a number of forms in which this chart has been presented. One form, proposed by Grosvenor [5], is shown in Figure 2.5 for the air-water system at 1 atm. 

Psychrometric charts are plots of humidity, temperature, enthalpy, and other useful parameters of a gas-vapor mixture. They are helpful for rapid estimates of conditions and for visuahzation of process operations such as humidification and drying. They apply to a given system at a given pressure, the most common of course being air-water at atmospheric pressure. There are four types, of which the Grosvenor and Mollier types are most widely used ... 

FIG. 12-1 Grosvenor psychrometric chart for the air-water system at standard atmospheric pressure, 101,325 Pa, SI units. (Courtesy Carrier Corporation.)... 

The American Society of Agricultural Engineers (ASAE) http //www.asae.org. Psychrometric data in chart and equation form in both SI and English units. Charts for temperature ranges of -35 to 600°F in uses units and -10 to 120°C in SI units. Equations and calculation procedures. Air-water system and Grosvenor (temperature-humidity) charts only. 

Linric Company httpY/www.linric.com. PsyePro generates ens-tom psychrometric charts in English (USCS) or metric (SI) nnits, based on ASHRAE formnlas. Air-water system and Grosvenor charts only. 

Aspen Technology httpy/www.aspentech.com. PSYCHIC, one of the Process Tools, generates enstomized psychrometric charts. Mollier and Bowen enthalpy-hnmidity charts are prodneed in addition to Grosvenor. Any gas-vapor system can be handled as well as air-water data supplied for common organic solvents. Can draw operating lines and spot points, as shown in Fig. 12-7. 

Construction of psychrometric charts by computer methods is common. Three types of charts are most popular Grosvenor chart, Grosvenor (1907) (or the psychrometric chart), Mollier chart, Mollier (1923) (or enthalpy-humidity chart), and Salin chart (or deformed enthalpy-humidity chart) these are shown schematically in Figure 3.3. 

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