1993-07-01

Advanced Computational Analyses for Design and Control of Pumped Liquid Loop Systems 932052

Computational procedures are clearly shown in the tables in such a staged way as one may easily proceed design calculations of cold plates, space radiators, and single-phase fluid loop systems. All the procedures are incorporated into a design code which can deal with two types of cold plates, five types of space radiators, and five configurations of a fluid loop mechanically driven by either rotodynamic or volumetric displacement one. Equivalent hydraulic diameters, heat transfer area densities, dry weights, and pressure losses are calculated over a wide range of parameters to give demonstrative examples of design practices. For cold plate design optimization, the weight and the pressure loss are displayed in the figures as functions of baseplate area, width to length ratio, or diameter to diameter/height ratio. Several figures are then placed to understand the off-design heat absorption/rejection capability of a cold plate/flat radiator and to show the weight penalty of a curved radiator. Also given in the tables are numerical results of preliminary/conceptual design calculations of two kinds of pumped liquid loop systems to be developed in NASDA. Then, an algorithm for flow modulation of a single loop and that of coupled two loops are constructed according to nine ways of cold plate temperature regulations. The algorithms are summarized in the tables on which another code is formulated. The required flow modulation rate versus the thermal load is shown in the figures as illustrative examples of loop control.

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