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transient analyses as well as to steady-state studies which require a value for compressor efficiency. The recompression cycle is interesting to next generation nuclear reactors because it achieves high efficiencies, especially at high turbine inlet temperatures. The turbomachinery is compact and sodium reactions with CO2 are less exothermic than sodium reactions with water. The working fluid, CO2, is abundant, non-toxic, and cheap. It appears that at higher temperatures (500 oC and up), the S-CO2 cycle can outperform the Rankine cycle, but even if the advantage is moderate, the compactness of the S-CO2 cycle may be a very significant savings in cost and space. This compactness has made the cycle a consideration for such applications as space and naval power cycles. 1.4 HEATRICTM Printed Circuit Heat Exchanger Background HEATRICTM Printed Circuit Heat Exchangers (PCHEs) are discussed often in this research. They are the heat exchanger of choice for compactness and ruggedness. They are formed by diffusion bonding plates with etched channels. Alternating plates for hot and cold fluids allow for very high heat transfer area in a relatively compact volume. Figure 1.3 shows the stacking of hot and cold PCHE plates and the cross section of semi-circular etched channels. PCHEs have been modeled at MIT with Fortran codes written by Pavel Hejzlar [Hejzlar et al., 2007] and updated by several others [Shirvan, 2009]. Figure 1.3: HeatricTM Printed Circuit Heat Exchangers are formed by diffusion bonding stacked plates (left) of alternating hot and cold fluid channels. This creates a monolithic block of parallel channels (right). [Heatric, 2009] PCHEs can be built with a varied range of channel diameters, but they are, in general, very small. The PCHEs used in this models discussed here have channel diameters of 2.5 mm. They can be constructed with alternating hot and cold plates, one hot plate for two cold plates, etc. They have the option of producing “hybrid” designs which include a separating plate with fill gas channels for leak detection, as shown in Figure 1-5. 18PDF Image | Supercritical Carbon Dioxide Cycle Analysis
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