Performance of finned thermal capacitors

The performance of typical thermal capacitors, both in earth and orbital environments, was investigated. Techniques which were used to make predictions of thermal behavior in a one-g earth environment are outlined. Orbital performance parameters are qualitatively discussed, and those effects expected to be important under zero-g conditions are outlined. A summary of thermal capacitor applications are documentated, along with significant problem areas and current configurations. An experimental program was conducted to determine typical one-g performance, and the physical significance of these data is discussed in detail. Numerical techniques were employed to allow comparison between analytical and experimental data

Monitoring and control of atmosphere in a closed environment

Applications requiring new technologies for atmosphere monitoring and control in the closed environment and their principal functions aboard the Space Station Freedom are described. Oxygen loop closure, involving the conversion of carbon dioxide to oxygen; carbon dioxide reduction and removal; and monitoring of atmospheric contamination are discussed. The Trace Contaminant Monitor, the Major Constituent Analyzer, the Carbon Dioxide Monitor, and the Particulate Counter Monitor are discussed

Solar residential heating and cooling system

System has been placed in operation to verify technical feasibility of using solar energy to provide residential heating and cooling. Complete system analysis was performed to provide design information

A Recipe for State Dependent Distributed Delay Differential Equations

We use the McKendrick equation with variable ageing rate and randomly distributed maturation time to derive a state dependent distributed delay differential equation. We show that the resulting delay differential equation preserves non-negativity of initial conditions and we characterise local stability of equilibria. By specifying the distribution of maturation age, we recover state dependent discrete, uniform and gamma distributed delay differential equations. We show how to reduce the uniform case to a system of state dependent discrete delay equations and the gamma distributed case to a system of ordinary differential equations. To illustrate the benefits of these reductions, we convert previously published transit compartment models into equivalent distributed delay differential equations.Comment: 28 page

A design handbook for phase change thermal control and energy storage devices

Comprehensive survey is given of the thermal aspects of phase change material devices. Fundamental mechanisms of heat transfer within the phase change device are discussed. Performance in zero-g and one-g fields are examined as it relates to such a device. Computer models for phase change materials, with metal fillers, undergoing conductive and convective processes are detailed. Using these models, extensive parametric data are presented for a hypothetical configuration with a rectangular phase change housing, using straight fins as the filler, and paraffin as the phase change material. These data are generated over a range of realistic sizes, material properties, and thermal boundary conditions. A number of illustrative examples are given to demonstrate use of the parametric data. Also, a complete listing of phase change material property data are reproduced herein as an aid to the reader

Final Year Induction - Re-engagement and Re-motivation

This paper considers design education in practice and reports on a new experience undertaken at ?? University (?U) with final year BA/BSc Product Design students. Increasingly, students returning to the final year of the programme have struggled in recent years to both develop credible final year project proposals and also re-engage with academic life and meet the expectations held of them at Honours level. Therefore, the final year project team took the decision to implement a new strategy for the start of the final year in September 2011. The students returned to University a week early and undertook an intensive, week long, programme that was specifically designed to: a) Engage them fully with a return to academic life and set expectations of final year b) Expose them to a wide range of opportunities to seek meaningful problems that would benefit from a product based solution. This paper expands upon the structure of the week and the activities that were undertaken by students and also provides feedback on the experience from the perspective of both academic staff and students. The paper concludes with a detailed evaluation of the experience and what has been learnt. However, the experience has been deemed to be a success by both staff and students and planning for a similar experience next year has already begun, along with a plan to roll out the principles to all design courses within the Framework