Supercritical Carbon Dioxide Cycle Analysis

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Supercritical Carbon Dioxide Cycle Analysis ( supercritical-carbon-dioxide-cycle-analysis )

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Table 3.1: The operating points of the compressors in the recompression cycle. The recompressing compressor is assumed to be a two-stage design. Inlet Temperature (oC) 31.89 66.99 107.44 Stage Main Recomp Stage 1 Stage 2 Mass Flow Rate (kg/s) 1589.1 989.6 989.6 Pressure (MPa) 7.67 7.71 12.42 Pressure (MPa) 20.00 12.42 19.92 Outlet Temperature (oC) 60.97 107.44 157.34 Table 3.2: The non-dimensional parameters of the compressors in the recompression cycle. The two stages of the recompressing compressor are shown separately. Specific Speed Ns Head Coefficient Ψ Flow Coefficient φ Mcomp 3.42 1.917E-3 9.80E-04 Recomp 1 4.04 1.640E-3 1.08E-03 Recomp 2 2.83 2.885E-3 1.24E-03 Sandia Test 3.39 3.689E-3 2.58E-03 Based on the non-dimensional parameters given in Table 3.2, the centrifugal compressor is the best choice for the S-CO2 recompressing compressor. The values of the non-dimensional parameters given in Table 3.2 are extreme values in the centrifugal compressor range. They do not match Figure 3.1 but the centrifugal compressor is a better option than any other based on Figure 3.1. The values for the Sandia test compressor are based on a rotational speed of 45,000 RPM. The Sandia test compressor comes closer to the centrifugal compressor region in Figure 3.1. The recompression cycle’s main compressor can be designed as a single stage for a PCS rated above ~400 MWth and a two-stage design is best suited for the recompressing compressor. If the PCS power is reduced below 400 MWth, the mass flow rates of the compressors are reduced. In order for the specific speed of each stage to remain within the range of centrifugal compressors, the pressure ratio of each stage must be reduced, and therefore the number of stages must be increased. In order to produce a design of only one stage for the main compressor, the cycle power must be above 400 MWth. To understand the operation of a compressor design code a few centrifugal compressor concepts will be necessary. First, terminology is necessary to understanding. Figure 3.2 shows several parts of a centrifugal compressor. The view given in Figure 3.2 is termed the meridional plane. It is defined as the plane that contains the axis of rotation. 46

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