Application of high temperature multilayer insulations

Effect of Xenon Gas and Foils on a Multi-Foil Insulation

“…At the same pressure and at 448 K, the experimental result is 1.2x10 -2 W/m K, while the theoretical value is only 1.05x10 -2 W/m K, deviating by 12%. Apparently the agreement between the experimental and modeled effective thermal conductivities of the array, within 0-15%, is obtained in the pressure range of 1x10 4 Pa-1x10 5 Pa.…”

“…All the measured conductivities are higher than the predicted values. At 1x10 4 Pa, the conductivity measured at 327 K is 8.1x10 W/m K, and the prediction provides 7.56x10 -3 W/m K, deviating 7.5%. At the same pressure and at 448 K, the experimental result is 1.2x10 -2 W/m K, while the theoretical value is only 1.05x10 -2 W/m K, deviating by 12%.…”

“…Figure 8, demonstrates the experimental and modeled conductivities in xenon, at a scale of 0-0.014 W/m K, within the pressure range of 0.01-1x10 5 Pa. The modeled curves are continuous for the temperature range of 300-500 K, at steps of 50 K. The measurements were performed at distinct pressures of 1x10 4 Pa and 1x10 5 Pa, and at specified temperatures. All the measured conductivities are higher than the predicted values.…”

“…All the measurements are summarized in Table 1. 11 experiments were conducted in xenon. The gas pressure applied was 1.01x10 4 Pa, and 1.01x10 5 Pa. The inside temperature ranged within 46°C-365°C.…”

“…Keller et al [4] studied high-temperature multi-layer insulation performance in a changing environment. He analyzed the dependence of heat transfer modes on various design parameters, by illustrating examples, like a probe for solar system exploration or a solar space power system.…”