By W.P. Jones MSc CEng FInstE FCIBSE MASHRAE
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9. G. Wyllie and T. Lalas, The WMO Psychrometer, Tech. Paper, CSIRO, Division of Applied Physics, Australia, 1981. 10. NACA, Standard atmosphere~tables and data for altitudes to 65,000 feet, NACA Report 1235: 66, Washington DC, 1955. 11. C. Bull, Design and use of the new IHVE psychrometric chart, JIHVE, October 1964, 32, 268. 1 The psychrometric chart This provides a picture of the way in which the state of moist air alters as an air conditioning process takes place or a physical change occurs.
966 kg mo1-1. 33). The symbol fs is a dimensionless enhancement factor and, according to Hyland and Wexler (1983), is dependent on: Henry's constant (relating to the solubility of air in water), saturation vapour pressure, temperature, barometric pressure, and other factors. The related equations are complicated. 1 are based on Goff (1949) and form the basis of the calculations leading to the CIBSE psychrometric tables (1986) and chart according to Jones (1970). 004. 34) ik ijk The term Aik(T) is a function of temperature and represents the second virial coefficient if i = k, but an interaction coefficient if i ;e k, the molecules being considered two at a time.
10 The triple point of water. 100 ~ 34 Fundamental properties of air and water vapour mixtures and vapour, as changes of pressure and temperature occur. 2 Pa is defined by international agreement as the temperature at which the solid, liquid and vapour forms of water can exist together in saturated equilibrium. 15 K), respectively. We see in the figure that it is not possible for liquid water to exist at a pressure below that of the triple point. We also see that, because the solid-liquid line is very nearly vertical, liquid water temperatures less than 0~ are only possible at very high pressures.
Air Conditioning Engineering by W.P. Jones MSc CEng FInstE FCIBSE MASHRAE