Creighton, William Henry Paul, 1859- · New York, J. Wiley & sons; [etc., etc.] · leaf 164
y dry air is tt= 1fiQ =1.406. X for moist air has some value between 1.4 and 1.2. The equation PVr = C may be easily derived from the twofundamental equations of thermodynamics derived on page 152: H = KpdT-VdP,H = KvdT+PdV. When the expansion is adiabatic H = 0: KpdT=VdP,KvdT= -PdV,K2= VdP Kv~r~… … Fig. 94. Differentiate PVn = C. VndP + nP7n~1dV = 0 is the equation of the tangent. ■• dP=-nP-y, or jy=~nV From the figure, dP md md md cd de cd de From similar triangles, abbe n also. The minus sign shows that the angle, <£, that the tangent makeswith the X axis, if measured from the X axis to…
Steam-engines · Heat-engines
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