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RPM. In the case of electricity production, the compressor will be operating at 3600 RPM or some fraction of 3600 RPM, so it was desirable to input RPM and avoid the complications of specific speed. Choosing a specific speed meant that the designer would have a more difficult process than if the rotational speed was an input. CCDS also required an input value of the de Haller number, the ratio of relative velocity at impeller inlet to that at the outlet, W2OW1T in CCDS/CCODS. This limit was intended to allow the user to guarantee a design that would meet the criterion of W2/W1 > 0.75. de Haller introduced this criterion as a way of guaranteeing that the stage would avoid stall, but this method is not entirely sufficient [Cumpsty, 2004]. The de Haller number is a limit on the head loading of each stage in a multi-stage compressor. In other words, it is a limit on the pressure ratio for a single stage. Therefore, a low de Haller number should be an indication to the designer that a compressor design needs to be reevaluated in terms of stage number. The constraint resulted in some unphysical results. By restricting the relative velocities to be proportioned by the designer, the mass flow rate at impeller outlet did not match that at impeller inlet in every design. The difference could be as much at 5.6 % in CCDS. Furthermore, the constraint in the outlet velocity meant that the calculated enthalpy and pressure rise were not reliable. The outlet velocity triangle was calculated based on an assumed relationship to the inlet triangle and the proportional relationship between outlet diameter and blade speed. The above shortcomings prompted an effort to produce a new code that would take advantage of Fortran 90’s improvements and would be accurate, user-friendly and more readable for new users. The new code’s compressor maps agree with the design point and there is a supplement that allows stages to be coupled into a multistage design (up to three stages). It has been named RGRC, for Real Gas Radial Compressor, and the multistage code has been called RGRCMS, with the MS added for Multi-Stage. 3.3.2 Basic Outline of the RGRC Code Designing compressors is sometimes described as a combined art and science. Some parameters of the design must be “known” by the designer in order to achieve acceptable performance. Some geometrical parameters are determined within RGRC in order to alleviate some decision-making on the part of a code user who may be inexperienced with compressors. However, the designer must make many important choices about compressor parameters in order to achieve a successful design. The code will return warnings to the designer to indicate what parameters can be changed in order to avoid problems. The code calculates all quantities based on physical laws, experimental correlations, and experimentally determined fluid properties. The code can be broken into several portions. They are: 54PDF Image | Supercritical Carbon Dioxide Cycle Analysis
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