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Research Paper On Permafrost

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All over Alaska, heat from roadways and buildings is causing the ice in unstable permafrost formations to melt, creating serious issues for the safety and longevity of Alaskan infrastructure. Lying beneath as much as 85% of Alaska, the majority of structures across the state are built on top of the permafrost layer, which has grown increasingly unstable with the advent of global warming. Ed Yarmak, the president of Arctic Foundations, states, “If you’re going to put a building on permafrost, unless the permafrost is thaw stable, which most of it isn’t, your building is going to settle.” This settling and destabilization of the earth is projected to raise the cost of maintaining affected public infrastructure by 10-20 percent ($4-6 billion) by 2030 and another 10-20 percent ($5.6-7.6 billion) by 2080 …show more content…

Passive thermosiphons operate without external power, utilizing the vaporization of a pressurized gas in its liquid phase at the lower, buried end of the tube, which rises through an adiabatic middle- section and condenses on the walls of the top. This liquid, then releases its latent heat to the wall (and thus the outside air), cools and runs back down to the bottom of the tube by gravity. Passive thermosiphons are the most common in Alaska, but are limited by their inability to withdrawal heat from the ground when it is cooler than the air temperature. While this may be a serious limitation in warmer climates, the temperature during the winter in central Alaska typically hovers around -15 to -25 °F (-26 to -32 °C), so ground temperature can be greatly reduced during the winter. Additionally, during summer nights, temperatures can get cold enough for thermosiphons to function, aiding in the refreezing of permafrost. Hybrid and active thermosiphons use a heat pump to cool the ground during times when the air is warmer than it, increasing their effectiveness, but also requiring an energy

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