This Phase II study provides further analysis for a seasonal-storage solar-heating system utilizing two existing underground, concrete tanks in the National Historic Park of the Charlestown Navy Yard in Boston. The initial Phase I study was reported in ANL-82-90. The new results focus on the effect of including a heat pump in the system to extend the useful heat-storage capacity of the tanks. The analysis was performed with MINSUN Version III, a computer simulation model written particularly for seasonal storage systems. Input parameters were derived in Phase I and reviewed and updated for this study. Three collector types were studied with and without a heat pump. Results indicate a definite performance and economic improvement for all collector types by including the heat pump. Flat plate collectors showed substantially greater improvement due to their more pronounced increase in efficiency at the lower inlet temperatures. With the heat pump, all three collectors provide comparable performance, and the flat plates were chosen as the design system due to their lower cost. A design system of 2300 meters sq. flat plate collectors with heat pump was selected. The system provides a solar fraction of 50% for the 2167 MWH annual heat load. The annualized …

Fluid damping plays an important role for structures submerged in fluid, subjected to flow, or conveying fluid. This design guide presents a summary of calculational procedures and design data for fluid damping for circular cylinders vibrating in quiescent fluid, crossflow, and parallel flow.

Report discussing a project to design, build, and test a latent heat storage device using cross-linked, high-density polyethylene (HDPE). This report provides an update on progress up to the point that the device is ready to test.

The research program in nuclear physics in the Physics Division spans a broad range of activities and contributes to many of the major questions in the discipline. Activities may be roughly divided into three broad categories. Research with the tandem-linac in heavy-ion physics is doing well, though laboring under severe budgetary constraints, and outside use of the facility has increased substantially. Progress on the construction of the full ATLAS facility is coming along expeditiously and it is expected to be completed on schedule in 1985. In medium-energy physics, activities are continuing at LAMPF, as well as other accelerators, though considerable effort was devoted this year to the preparation of a proposal for a national electron accelerator facility.

This report summarizes the work completed on a project concerned with engineering models in dynamic plasticity. The concept of the endochronic theory of viscoplasticity and its subsequent improvement are discussed briefly. Applications and extensions of the theory to various dynamic problems are presented. In particular, the strain-rate effect in the improved endochronic theory and its application to wave propagation problems are discussed. Comparing the numerical results with other calculations and experimental data, it appears that endochronic theory provides a promising representation of realistic material behavior. At the same time endochronic theory is often numerically more efficient than other formulations.

The susceptibility of a cantilevered tube conveying water to self-excitation by leakage flow through a slip joint is assessed experimentally. The slip joint is formed by inserting a smaller, rigid tube into the free end of the cantilevered tube. Variations of the slip joint annular gaps and engagement lengths are tested, and several mechanisms for self-excitation are described.