Fast Convolution in Calculation of Soil Temperature surrounding Ground Heat Exchangers with GPGPU

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  • SHOJI Yutaka
    Division of Human Environmental Systems, Graduate School of Engineering, Hokkaido University
  • KATSURA Takao
    Division of Environmental Engineering, Faculty of Engineering, Hokkaido University
  • SAKATA Yoshitaka
    Division of Environmental Engineering, Faculty of Engineering, Hokkaido University
  • NAGANO Katsunori
    Division of Environmental Engineering, Faculty of Engineering, Hokkaido University

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  • 地中熱交換器周囲温度場計算における畳み込みのGPGPUを用いた高速化
  • チチュウ ネツコウカンキ シュウイ オンドジョウ ケイサン ニ オケル タタミコミ ノ GPGPU オ モチイタ コウソクカ

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Abstract

<p>The optimal design of ground heat exchangers is essential to reduce the life cycle cost of shallow geothermal systems, therefore the fast computation is desired for a long term simulation. The temperature in the ground heat exchangers field is expressed as a convolution product of the incremental heat loads and the temperature response function for a unit heat load, and that can be calculated efficiently using the fast Fourier transform. This work aims at the fast convolution using the fast Fourier transform by graphics processing unit. This method indicates 22.8 s computation time for 25 years at 60 seconds interval convolution, that is 2.5 times faster than the calculation without graphical processing unit.</p>

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