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| Renewable thermal energy ： ウィキペディア英語版 |
Renewable thermal energy
Renewable thermal energy is the technology of gathering thermal energy from a renewable energy source for immediate use or for storage in a thermal battery for later use. An example of Renewable Thermal is a Geothermal Heat Pump (GHP) system, where excess thermal energy due to solar heating from the sun is removed from the structure via the heating and cooling system and stored in the ground, and that same energy is then extracted from the ground to later heat the same building in another season. This example system is "renewable" because the source of excess heat energy is a reliably recurring process that occurs each summer season; in this case it is even a natural renewable energy source.
== History of Renewable Thermal Systems ==
The outer crust of the Earth is a Thermal Battery that maintains a median temperature which is the same as the average air temperature at that location. This "average ground temperature" is a combination in balance of solar gain from the sun, thermal gain from the core of the earth, and heat loss due to conduction, evaporation, and radiation. The graphic at the right shows a map of the "average ground temperature" at locations within the United States.〔(), US Average Ground Temperature Map〕
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