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Outline
The U-bend deep borehole heat exchanger (UDBHE) has a promising application potential. This paper is based on the G functions of infinite cylindrical source (ICS) and infinite line source (ILS) models, four heat transfer models of UDBHE are established, and they adopt the G function of ICS or ILS model, and consider or ignore the time-varying heat flow at the borehole wall, which are abbreviated as ICS-q, ILS-q, ICS-c and ILS-c models, respectively. The accuracy of the four models is studied by comparing with a more accurate two-dimensional numerical model and experimental data under two boundary conditions. The results show that the ILS-q model is the most accurate on the whole, and that the ICS-q model is the most accurate in analyzing the long-term performance of UDBHE. The four models have large errors in the early stage, but after enough long time, the errors of them are small except that the ILS-c and ICS-c models have large errors under the inlet temperature boundary condition. The errors mainly result from two aspects: the G functions of ICS and ILS models have some errors; ignoring the time-varying heat flow will cause some errors. The results can provide reference for the heat transfer model study of UDBHE.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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