Download Information theory and statistical mechanics II by Jaynes E.T. PDF

By Jaynes E.T.

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Extra resources for Information theory and statistical mechanics II

Example text

0. 0. 0. 16 Generalized effectiveness plot with parameter Nh/Nc for contraflow and parallel-flow heat exchangers Effectiveness versus Ntu plots Many texts present curves of effectiveness (e) versus number of transfer units (Ntu) over a range of capacity-rate ratios for a variety of flow arrangements, and apply these curves in design. Examining definitions of these axes in contraflow allows effectiveness as and equally we might have plotted (kdmax/Tspari) versus Ntu. 14). 4. 11 Sizing when Q is not specified Occasionally a sizing problem may arise when Q is not known but 'best practicable recuperation' is desired.

Small recuperators A recuperator of two-pass involute design has been developed for military tank propulsion (Ward & Holman, 1992), (Fig. 8). In the compact vehicle propulsion system shown in Fig. 9 (after Collinge, 1994), the power turbine exhaust flows outwards through the exchanger core while high-pressure combustion air flows axially through the exchanger in two passes. Swirling exhaust gases can be directed by an outlet scroll before entering the exhaust stack. Some development work would be required to realize the involute-curved plate-fin exchanger.

Thermal sizing is identical to that for the compact flat-plate design. Plate spacing on the high-pressure cold air side is narrow while the spacing on the low-pressure hot gas side is wide. For a single-pass contraflow design some thought would be required in the arrangement of headers. A further problem with the involute exchanger is the difficulty of cleaning curved channels. Wilson (1995) believes that a rotating ceramic regenerator should be preferred, as it could be more easily cleaned, but it introduces the problem of sliding seals.

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