PDF
Full
Outline
Aiming at the longterm operation of the mediumdeep coaxial borehole heating system which has issues of cold accumulation in rocksoil and decrease in the heat extraction capacity of the system, in this research, a numerical heat transfer model for MDGSHPs was established, the governing equations were discretized based on the finite difference method, and the accuracy of the model was verified with experimental data. This research separately studied the effects of heat storage temperature (Tin) and flow rate of hot water injection (G) on BHE heat extraction rate (Q), system energy consumption(W) and the coefficient of system performance (CSP) in the next heating period. The results show that the first step to realize heat storage is to determine the threshold value for the temperature of heat storage water. Below the threshold, heat storage will not be achieved, and the threshold temperature for this study is 50 °C. After operating for 500 hours, when the inlet water temperature increases from 50 °C to 80 °C, Q, W and CSP increase by 54.41 kW, 8.96 kW and 0.17. Furthermore, when the flow rate of hot water injection increases from 1 kg/s to 7 kg/s, the growth rate of Q, W and CSP are 7.71%, 6.34% and 1.19%. Therefore, a small flow rate with high temperature of heat storage water is recommended during the heat storage period which will improve heat storage effect and reduce energy consumption. This study provides a theoretical basis for heat storage in MDGSHPs.
PDF
263
129
| 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 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
