The effect of intercooling on compressor work is

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Unformatted text preview: t exchanger called an intercooler. Ideally, the cooling process takes place at constant pressure, and the gas is cooled to the initial temperature T1 at each intercooler. Multistage compression with intercooling is especially attractive when a gas is to be compressed to very high pressures. The effect of intercooling on compressor work is graphically illustrated on P-υ and T-s diagrams in Fig. 7–46 for a two-stage compressor. The gas is compressed in the first stage from P1 to an intermediate pressure Px, cooled at constant pressure to the initial temperature T1, and compressed in the second stage to the final pressure P2. The compression processes, in general, can be modeled as polytropic (Pυ n constant) where the value of n varies between k and 1. The colored area on the P-υ diagram represents the work saved as a result of two-stage compression with intercooling. The process paths for single-stage isothermal and polytropic processes are also shown for comparison. P P2 Isentropic (n = k) Polytropic (1 < n < k) Isothermal (n = 1) P1 1 υ FIGURE 7–45 P-υ diagrams of isentropic, polytropic, and isothermal compression processes bet...
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