. Applied thermodynamics for engineers. Fig. 134a. Art. 308a.—Humphrey The action is unaccompanied by any great rise of temperature of the metal, since nearly all parts are periodically swept by cold water. The pump as described works on the four-cycle principle, the operations being (Fig. 1346): a. Ignition (ab) and expansion (he);h. Expulsion of charge {cd, de),suction of water, com-pression of residualcharge (e/) ; c. Intake {feg, gh); d. Compression (ha).Disregarding the two loops ehg, dcm, the cycle is bounded by two polytropics, one fine of constant volume and one of constant pres
. Applied thermodynamics for engineers. Fig. 134a. Art. 308a.—Humphrey The action is unaccompanied by any great rise of temperature of the metal, since nearly all parts are periodically swept by cold water. The pump as described works on the four-cycle principle, the operations being (Fig. 1346): a. Ignition (ab) and expansion (he);h. Expulsion of charge {cd, de),suction of water, com-pression of residualcharge (e/) ; c. Intake {feg, gh); d. Compression (ha).Disregarding the two loops ehg, dcm, the cycle is bounded by two polytropics, one fine of constant volume and one of constant the temperature limits Tj, and Tj^ it gives more work thanthe Otto cycle hahj, and if the curves he and ah were adiabatic wouldnecessarily have a higher efficiency than the Otto cycle. The actualpaths are not adiabatic: during expansion (as well as during ignition)some of the heat must be given up to the water; while the heat generatedby compression is similarly (in part) transferred to the water along the adiabatic assumption adopted for the purpose o
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