地源热泵季节性能测试理论研究
Theoretical research of seasonal performance testing for ground-source heat pump systems
摘要：
以夏季某典型工况下的地埋管实测水温为例，根据傅里叶级数近似算法及采样定理，确定还原整个夏季地埋管出水温度需要的最少测试点数目，建立了地源热泵季节性能工程测试方法。结果显示，在地埋管夏季运行期间，对其出口水温均匀测试4次，利用2阶谐波的傅里叶级数即可还原地埋管整个运行期的水温，且还原结果与实测结果吻合性较好；对2阶谐波的傅里叶级数相位放大2.3倍，可将还原结果误差降至±1%的范围内。
Abstract：
Taking the measured water temperature of buried pipe in a typical summer condition for example, according to Fourier series approximation algorithms and sampling theorem, determines the minimum number of test points to restore the outlet water temperature fluctuation profile during the entire summer running process, and presents the seasonal performance testing method for ground-source heat pump systems. The results show that the water temperature profile of buried pipe during the entire summer running process can be restored by uniformly testing outlet water temperature four times, and by using second order harmonic Fourier series, the restored results and the measured results are in good agreement. Through magnifying the phase of second order harmonic Fourier series by 2.3 times, the restored error can be reduced to ±1%.
Keywords:ground-source heat pump, seasonal performance testing, buried pipe, outlet water temperature, Fourier analysis, sampling theorem, second order harmonic