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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. 0052 The function Aok(T) then refers to the molecules considered three at a time. 35) na + nw where n a is the number of moles of constituent a and nw is the number of moles of constituent w.

If a heat exchange occurs at constant pressure, as well as a change in internal energy taking place, work may be done. 19) The equation is strictly true for a pure gas of mass m, pressure p, and volume V. However, it may be applied without appreciable error to the mixtures of gases associated with air conditioning. 19). This, and the other common synonym for enthalpy, 'total heat', suggest that only the internal energy of the gas is being taken into account. As a result of this, both terms are a little misleading and, in consequence, throughout the rest of this book the term enthalpy will be used.

Join them by a straight line and extend the line to cut the saturation curve. 25~ It is not easy to decide this value with any exactness unless a large psychrometric chart is used. However, it is sufficiently accurate for present purposes (and for most practical purposes) to take the value read from an ordinary chart. 94 kJ kg -1. 874 [3 = 5 9 . 25 ~ 48 The psychrometry of air conditioning processes Clearly, in view of the error in reading the apparatus dew point from the chart, the value of 15 obtained from the temperatures is quite accurate enough in this example and, in fact, in most other cases.

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