Optimization of ground heat exchangers for space heating and cooling applications using Taguchi method and utility concept
Optimization of ground heat exchangers for space heating and cooling applications using Taguchi method and utility concept
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DOI：
10.1016/j.apenergy.2016.12.154
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发表时间：
2017-03
期刊：
影响因子：
11.2
通讯作者：
Navdeep Pandey;K. Murugesan;H. Thomas
中科院分区：
文献类型：
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作者：
Navdeep Pandey;K. Murugesan;H. Thomas
地源热泵(GSHP)系统在地下热交换器(GHX)的帮助下，将地能用于空间供暖和制冷应用。当地源热泵同时用于供暖和制冷时，确定最佳的地源热泵长度是非常重要的。在本研究中，以一台1.5吨地源热泵系统为例，在不同的供暖和制冷周期组合下，对水平和垂直换热长度进行了优化。假设了三个水平的八个操作参数，并采用L27正交表进行了实验研究。对于水平和垂直的温室气体排放，田口方法被用来获得供暖和制冷应用的独立最优长度，然后利用效用概念来估计在供暖和制冷期间对于给定重量的单一最佳长度。在公用事业概念中以加权系数表示的供暖和冷期的不同组合得到了结果，这两种类型的温室气体排放的范围从20%到80%不等。还分析了地源热泵系统中使用GHX的COP变化的影响，以确定其对GHX长度的影响。垂直环流长度在所有加热和降温周期的组合中保持不变，但降温时的垂直环流长度比供暖时的长约33%。相比之下，水平GHX在下界和上界的变化约为20%，在中界的变化恰好为50%。
Ground source heat pump (GSHP) systems utilize ground energy for space heating and cooling applications with the help of ground heat exchangers (GHX). When GSHP is used for both heating and cooling applications it is very important to determine the optimum length of GHX. In the present research the length of horizontal and vertical GHX is optimized for a 1.5 TR GSHP system assuming different combination of heating and cooling periods. Eight operating parameters of GHX at three levels have been assumed and L27orthogonal array has been employed to obtain experimental trials. For both horizontal and vertical GHXs, Taguchi method has been used to obtain independent optimum length for heating and cooling applications and then utility concept has been employed to estimate a single optimum length for a given weightage for heating and cooling periods. Results were obtained for different combinations of heating and cooling periods expressed as weighting factor in utility concept, ranging from 20% to 80% for both type of GHXs. Effect of variation in COP of the ground source heat pump system where the GHX is used is also analyzed to determine its influence on the length of GHX. Length of vertical GHX is found to remain constant for all the combinations of heating and cooling periods, however, the length of vertical GHX is about 33% higher for cooling than that for heating. In contrast, horizontal GHX showed about 20% variation at lower and upper bounds and 50% variation exactly at the middle bound.