24 (c)] THE STEAM-JET.
Then
Now
x=9+b,−ª_1.2518 b₂ g+=1191.18, .8730. 1.4339 + 181.94+842.38=1024.32. 141 The difference between these is 166.86 H.U.: it is the main part of E, identical with AU' in Table 16 A, where the value for the same conditions, by independent and less precise computation, was found to be 167.0. This result does not include the last term of Eq. (116): accord- ing to Table III., w,=.018, w,=.0167; it is fair enough to use a rough mean, giving the upper value a little more influence, say .0175; then 144 778(PP)-0.185x135x.0175=.44 H.U. Adding this to the 166.86 found above, we get E-167.30 H.U. The second quantity Ę, given in Table V. is the effective work same as AU in Tables 16 A and 16B: it of the Carnot cycle, the is computed by Eq. (78). For the case above, t, T₁=818.16, -t,=145.13, r₁ =860.62; then 358.16, t,-213.03, E₁ = 145.13 818.16 860.62–152.66 H‚U. Finally, E, equal to E-E₁, is the effective work of adiabatic expansion of water originally at p, and t₁, represented by the area AED in Fig. 45. On general principles, it could be more precisely calculated by making z₁-0 in Eq. (116), especially for small ranges of pressure, because E and E, are then large quanti- ties with a relatively small difference between them; but usually the method of subtraction indicated above will be found more convenient and sufficiently exact. Below the E's are entered in Table V. the limiting values of the final steam-fraction, л, for x₁ =1, 2, for ₁ =0; also the corre- sponding specific volumes at p..
