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A cross-linked polyethylene (PEX) pipe. Cross-linked polyethylene, commonly abbreviated PEX, XPE or XLPE, is a form of polyethylene with cross-links.It is used predominantly in building services pipework systems, hydronic radiant heating and cooling systems, domestic water piping, insulation for high tension (high voltage) electrical cables, and baby play mats.
Typically it is built by burying a continuous coil of high-density polyethylene (HDPE) or cross linked polyethylene (PEX) pipe in the ground. The pipe can be buried in excavated trenches 4' to 10' (1.3 to 3 m) deep, inserted into horizontal or vertical boreholes, or laid in the bottom of a pond, lake or the ocean.
Large-scale thermal storage with water. Large scale STES water storage tanks can be built above ground, insulated, and then covered with soil. [28] Horizontal heat exchangers. For small installations, a heat exchanger of corrugated plastic pipe can be shallow-buried in a trench to create a STES. [29] Earth-bermed buildings. Stores heat ...
Thermal storage, chilled water: 20.8: 2.6: 8: United States: North Carolina, Raleigh: 2.68 million gallon, chilled water, Thermal energy storage tank. Built partially buried and serving the district cooling system for 25 state government buildings. [5] University of Arizona: Thermal storage, ice: 18: 3: 6: United States: Arizona, Tucson
The high-temperature properties of the polymer are improved, its flow is reduced, and its chemical resistance is enhanced. PEX is used in some potable-water plumbing systems because tubes made of the material can be expanded to fit over a metal nipple and it will slowly return to its original shape, forming a permanent, water-tight connection.
Concentrated light can be redirected to a suitable location via optical fiber cable for such uses as illuminating buildings. Heat storage for power production during cloudy and overnight conditions can be accomplished, often by underground tank storage of heated fluids. Molten salts have been used to good effect. Other working fluids, such as ...
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