Sustainability, Journal Year: 2025, Volume and Issue: 17(7), P. 3234 - 3234

Published: April 4, 2025

Ground-source heat pump (GSHP) systems with medium-depth and deeply buried pipes in cold regions are highly important for addressing global climate change the energy crisis because of their efficient, clean, sustainable characteristics. However, unique geological conditions climates pose serious challenges to transfer efficiency, long-term stability, adaptability systems. This study comprehensively analyses effects various factors, including well depth, inner-to-outer tube diameter ratios, cementing material, thermal conductivity inner tube, flow rate, start–stop ratio, on performance a coaxial borehole exchanger. Field tests, numerical simulations, sensitivity combined determine full-cycle heat-transfer properties formations relationships system performance. The results show that source water temperature increases by approximately 4 °C 50 kW every 500 m increase depth. optimization outer pipe ratios effectively improves heat-exchange larger ratio design can significantly reduce resistance improve stability. When cement from 1 W/(m·K) 2 W/(m·K), outlet at side °C, 13 kW. improvement effect further increasing efficiency gradually decreases. rate is 0.7 m/s, stable 250 kW, economy reach balance. These findings provide robust scientific basis promoting medium-deep geothermal heating offer valuable references green low-carbon transition building

Language: Английский