. Applied thermodynamics for engineers. Fig. 131. Art. 306. —Diesel Engine. (American Diesel Engine Company.). Fig. 132. Art. 30G. — Indicator Diagram, Diesel Engine.(16 X 24 in. engine, 160 Spring 400.) 186 APPLIED THERMODYNAMICS 307. Efficiency. The heat absorbed along ah^ Fig. 130, is ^ a f^ a The heat rejected along/t? is ?(2y— T^). We may write the efficiencyas -Br., 2>= T,{^^= r„(-py\and T,= T,{^^; whence nX-! For the heat rejected along/c? we may therefore write -n and for the efficiency, 1- — wr-<\ This increases as T„ increases and as —^ decreases. The last conc

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. Applied thermodynamics for engineers. Fig. 131. Art. 306. —Diesel Engine. (American Diesel Engine Company.). Fig. 132. Art. 30G. — Indicator Diagram, Diesel Engine.(16 X 24 in. engine, 160 Spring 400.) 186 APPLIED THERMODYNAMICS 307. Efficiency. The heat absorbed along ah^ Fig. 130, is ^ a f^ a The heat rejected along/t? is ?(2y— T^). We may write the efficiencyas -Br., 2>= T,{^^= r„(-py\and T,= T,{^^; whence nX-! For the heat rejected along/c? we may therefore write -n and for the efficiency, 1- — wr-<\ This increases as T„ increases and as —^ decreases. The last concla- a y ^ a sion is of prime importance, indicating that the efficiency should in-crease at light loads. This may be apprehended from tlie entropydiagram, ahfd. Fig. 124. As the width of the cycle decreases (hfmoving toward ac?), the efficiency increases. 307 6. Diesel Cycle with PressureConstant. In common present practice,the engine is supplied with fuel at such a rate that the pressure, ratherthan the temperature, is kept constant during combustion. This gives amuch greater work area, in a

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