. Applied thermodynamics for engineers. oFig. 105. Art. 375.—In-ternal Energy of Steam. 376. The Entropy Diagram as a Steam Table. InFig. 161, let the state point be H. We have T= HI,from which P may be found. HJ is made equal to (T ^ L)(L — r), whenceOa VKJI — E and — xe. Also x = VH -^ VN, the entropy measured fromthe water line is VH, the momentary specific heat of the water along the dif-ferential path jL is gJLM-^Tj; xL = PVUI, xr = KJIP, h = OaVP, andH = OaVHI. The specific vohune is still to be considered. 242 APPLIED THERMODYNAMICS. Fig. 16H. Art. 377. —ConstantVolume Lines. 377.
. Applied thermodynamics for engineers. oFig. 105. Art. 375.—In-ternal Energy of Steam. 376. The Entropy Diagram as a Steam Table. InFig. 161, let the state point be H. We have T= HI,from which P may be found. HJ is made equal to (T ^ L)(L — r), whenceOa VKJI — E and — xe. Also x = VH -^ VN, the entropy measured fromthe water line is VH, the momentary specific heat of the water along the dif-ferential path jL is gJLM-^Tj; xL = PVUI, xr = KJIP, h = OaVP, andH = OaVHI. The specific vohune is still to be considered. 242 APPLIED THERMODYNAMICS. Fig. 16H. Art. 377. —ConstantVolume Lines. 377. Constant Volume Lines. In Fig. 166, let JA be the ^vaterline, BG the saturation curve, and let vertical distances below ONrepresent specific volumes. Let xs equal the volume of boiling water, sensibly constant, and of comparativelysmall numerical value, giving the line any point B on the saturationcurve, draw BI) vertically, making CI)represent by its length the specific volumeat B, Draw BA liorizontally, and AUvertically, and connect the points ^and J).Then BB shows the relation of volume ofvapor and entropy of vapor, along AB,the two increasing in arithmetical the similar lines of relation KL andHF iov the temperature lines JTand YG-,Draw the constant volume line TD^ andfind the points on the entropy planew^ V, B, corresponding to t, u, B. The line of constant volume wBmay then be drawn, with similar lines for other specific volumes, qz,etc. The plotting of such lines on the entropy plane permits of theuse of this
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