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Gratch, Low-pressure properties of water from -160 to 212F. Trans. ASHVE, 1946, 52, 95-122. 7. P. G. Lawrence, New psychrometric data for air, National College for Heating, Ventilating, Refrigeration and Fan Engineering, Technical Memorandum No. 11. 8. B. H. Cole, Engineering Thermodynamics, Edward Arnold (Publishers) Ltd, 1961. 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.

The chart also has a protractor which allows the value of the ratio of the sensible heat gain to the total heat gain to be plotted on the chart. 4) and is of value in determining the correct supply state of the air that must be delivered to a conditioned space. 1 shows a state point on a psychrometric chart. @•, % % / Specific volume / ,,U o \ ~ ~ A Dewpoint \\~ / (State Moisture content Drybulb Fig. 1 The variables shown on the psychrometric chart. 2 shows what happens when two airstreams meet and mix adiabatically.

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. Familiarity with the psychrometric chart is essential for a proper understanding of air conditioning. Any point on the chart is termed a state point, the location of which, at a given barometric pressure, is fixed by any two of the psychrometric properties discussed in chapter 2.

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