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Download PDF by W.P. Jones MSc CEng FInstE FCIBSE MASHRAE: Air Conditioning Engineering


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The third virial coefficient, Awww, is a function of the reciprocal of absolute temperature and is insignificant for temperatures below 60~ Other third order terms are ignored. 37) is to be used to determine the specific volume of dry air then Pa and R a replace p and R. 12 x 10-3 All the coefficients are in m3 kg-1 The coefficient Aaa in the first column is due to Hyland and Wexler (1983) but the coefficient Aaa in the second column, and the coefficients Aww and Aaw, are due to Goff (1949). The enthalpy of dry air increases very slightly as the pressure falls at constant temperature but, for most practical purposes, it can be regarded as a constant value at any given temperature from one standard atmosphere down to 80 kPa.

O. E h2 g3 g2 Dry-bulb temperature Fig. 2 The adiabatic mixing of two airstreams. Therefore gl - g3 g3 - g2 maz mal Similarly, making use of the principle of the conservation of energy, hi - h3 h3 - h2 ma2 mal From this it follows that the three state points must lie on a straight line in a massenergy co-ordinate system. The psychrometric chart published by the CIBSE is such a s y s t e m ~ w i t h oblique co-ordinates. For this chart then, a principle can be stated for the expression of mixture states.

When two airstreams mix adiabatically, the mixture state lies on the straight line which joins the state points of the constituents, and the position of the mixture state point is such that the line is divided inversely as the ratio of the masses of dry air in the constituent airstreams. 325 kPa barometric pressure. If the masses of dry air are 3 kg and 2 kg, respectively, calculate the moisture content, enthalpy and dry-bulb temperature of the mixture. 029 On the other hand, if the temperature were calculated by proportion, according to the masses of the dry air in the two mixing airstreams, a slightly different answer results: t= 3x60+2• 5 = 38~ This is clearly the wrong answer, both numerically and by the method of its calculation.

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