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Carnot vapour Cycle:
It is convenient to analyze the performance of steam power plants by means of idealized cycles that are theoretical approximations of real cycles. The Carnot cycle is an ideal, but non practising cycle giving maximum possible thermal efficiency for cycle operating on selected maximum and minimum temperature ranges. It is made up from four ideal processes: 1 - 2 : Evaporation of water into saturated steam within boiler at constant maximum cycle temperature T1 (= T2)
2 - 3: Ideal (that is, constant-entropy) expansion within the steam engine or turbine that is, S2 = S3.
3 - 4: Partial condensation within condenser at constant minimum cycle temperature T3 (= T4).
4 - 1: Ideal (that is, constant-entropy) compression of wet steam within the compressor to complete
the cycle, i.e., S4 = S1.
Gated pattern This is an improvement over the simple pattern where the gating and runner system are integral with the pattern. This would eliminate the hand cutting of the runn
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The round tensile specimen given below has a diameter of 0.5 in. A load, F, is applied and the deflection, g , is calculated. Given the following d = 0.5 in
Gathering Lines: A gathering line, also called a ladder track, is one into which a number of parallel tracks merge. This is shown in Figure. It is used in marshalling yards.
F AC T OR S AFFECTING THE SELECTION OF BOILER: - Working Pressure and amount of steam needed. - Floor area required. - Operating and Maintenance Required
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