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These conditions are summarized in Table 2.1 which provides the expected behavior of the loop as the compressor inlet conditions vary around the critical point near the top of the liquid-vapor dome. The table lists the state point operating temperatures and pressures at the inlet and outlet of each component in the loop. These state points are indicated by numbers 1-3, where 1 represents the compressor inlet, 2 the compressor outlet, and 3 the exit of the orifice, which is the same as the entrance to the gas pre-cooler (see Figure 2-2). These state point temperatures, pressures, mass flow rates and power are listed in the table for compressor inlet conditions at the design point, on the vapor side of the dome and on the liquid side of the dome with a shaft speed of 75,000 rpm. The major observations to make are that as one moves the compressor inlet condition from the vapor side of the saturation curve (or dome) to the liquid side of the saturation curve (dome) through the design point, the mass flow rate increases, the pressure ratio increases, the compressor power increases, and the temperature rises decrease. In spite of these large changes, the efficiency of the compressor remains nearly constant. On the liquid side of the dome, the mass flow rate increases over the design point because the more liquid systems have higher fluid densities, and thus more coolant is flowing for the same volumetric flow through the compressor. The larger coolant flow rate also increases the power, the pressure ratios increase because more liquid-like fluids have lower compressibility. The lower compressibility of the more liquid fluids also means a lower temperature rise upon compression than in the more vapor like fluids. The efficiency stays the same, because the mass flow rate in the analysis was adjusted to keep the specific speed of the compressor near its optimum. This requires that the orifice area of the valve changes to provide the flow rate as indicated in this table. Table 2.1 Expected operating conditions of the S-CO2 compression test loop at the design point and on the liquid and vapor sides of the dome. Property Design Point Vapor Side Liquid Side T1 (K) P1 (kPa) H1 (kJ/kg) T2 (K) P2 (kPa) H2 (kJ/kg) T3 (K) Isenthalpic P3 (kPa) H3 (kJ/kg) mdot (kg/s) Chiller power (kW) RPM (rev. per min.) mdotEq (kg/s) Pressure Ratio dH.Ideal (kJ/kg) Efficiency 305.3 7690 295 5000 295 7690 309.3829231 324.6590279 13984 324.3133239 436.3347377 316.8887813 6461.477561 450.8616943 253.5925441 306.0362581 14898.44307 267.3396258 306.1755619 303.3268813 298.9849653 7766.90 324.31 5050 450.8616937 7766.9 267.3396258 3.53 1 3.8 52.70430916 14.52695599 52.23891056 75000 75000 75000 3.5474701 3.785997516 4.31996661 1.818450313 1.292295512 1.937378813 9.911067497 9.643668505 8.754601852 0.663818019 0.663846444 0.636833477 23PDF Image | Operation and Analysis of a Supercritical CO2 Brayton Cycle
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