Study of Seasonal Ground Heat Storage of Solar Energy Using a Vertical Pipe System : Part 2-Experiment and Simuration of a Single Vertical Pipe

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  • 太陽熱による垂直管方式の長期地中蓄熱の特性と暖房への応用に関する研究 : 第2報-垂直単管の実験と数値解析
  • 太陽熱による垂直管方式の長期地中蓄熱の特性と暖房への応用に関する研究-2-垂直単管の実験と数値解析
  • タイヨウ ネツ ニ ヨル スイチョクカン ホウシキ ノ チョウキ チチュウ チ

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Experimental and theoretical studies were made on seasonal ground storage of solar energy by means of a single vertical pipe. Hot water from a solar collector was injected for 2 months to store heat in the ground and water of about 13℃ was injected to recover the stored heat. The general characteristics of ground heat storage and temperature variations were obtained. Unless insulation was used on the ground over and around the pipe, the majority of the heat stored for a long time escaped due to the climatic characteristics of the cold region. Furthermore, the temperature of the pipe in the heat recovery process had to be as low as possible for heat recovery. At a temperature of 13℃, the heat recovery rate, the ratio of recovered heat to injected heat, was only 3.2%. This was also proven by the results of simulation tests conducted under the same conditions. The effect upon the heat recovery rate when thermal insulation materials were used to prevent heat dissipation was clarified numerically. The max. heat recovery rate, however, was only 17% less than expected. The temperature level of the pipe should be lower to recover heat by using the temperature difference between the pipe and the soil. It is recommended that a large amount of the heat escaping from the ground be taken into the house. In other words, natural heat recovery in which the heat storage and the house are used together to determine the indoor temperature in a natural way.

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