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A study on utilization of ground source energy for space heating using a nanofluid as a heat carrier

机译：用纳米流体作为热载体利用地面源能量的利用研究

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Ground source heat pump (GSHP) systems are well established as an energy-efficient space conditioning device. However, for better utilization of the ground source, improvement in GSHP performance is desirable, which limits the small temperature difference between the ground and the circulating fluid. In this study, efforts have been made to investigate the performance of a ground heat exchanger (GHX) with a nanofluid as a heat carrier. Mathematical modeling is performed for the closed-loop vertical U-tube GHX with six different (Al_2O_3, CuO, graphite, multiwalled carbon nanotube, graphene, and Cu) water-based na-nofluids. The effect of different operating parameters on GHX length, fluid temperature, and pressure drop with nanofluids is determined. On the basis of the analytical results, it is found that the graphite particle-based nanofluid plays a prominent role to enhance the performance of the GHX as compared with other nanoparticles. The maximum enhancement in the increase in outlet fluid temperature and reduction in pipe length with graphite particle-based nanofluid are 68.3% and 63.3%, respectively, for an increase in temperature difference from 7°C to 15°C between the atmosphere and the ground. Also, with the graphite particle-based nanofluid and the increase in pipe diameter from 20 to 50 mm, the fluid outlet temperature increases up to 11.2%, and the requirement in GHX length reduces up to 55%.
机译：接地源热泵（GSHP）系统被确定为节能空间调节装置。然而，为了更好地利用地源，所需的GSHP性能的提高，这限制了地面和循环流体之间的小温差。在这项研究中，已经努力研究接地热交换器（GHX）与纳米流体作为热载体的性能。对闭环垂直U形管GHX进行数学建模，其具有六种不同（AL_2O_3，CUO，石墨，多壁碳纳米管，石墨烯和Cu）水基Na-Nofluids。确定不同操作参数对GHX长度，流体温度和纳米流体的压降的影响。在分析结果的基础上，发现基于石墨颗粒的纳米流体起到突出的作用，与其他纳米颗粒相比增强了GHX的性能。出口流体温度的增加和具有石墨颗粒基纳米流体的管道长度的最大增强分别为68.3％和63.3％，在大气和地面之间的7℃至15°C的温差增加。此外，通过石墨颗粒基纳米流体和管道直径的增加，从20至50mm的增加，流体出口温度增加高达11.2％，并且GHX长度的要求降低了55％。

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