In order to study the longterm
heat recharge performance of energy tunnel under different hydrogeological
conditions, the temperature fields of the surrounding strata of energy tunnel
under three heat exchange schemes of annual cycle, daily cycle, and
superposition of annual and daily cycles are simulated by finite element
method. In the numerical model, the temperature fields of strata, lining and
air, as well as underground water seepage and air flow are considered. For
simplicity, the heat exchanger is equivalent to a surface heat source, and the
different operation schemes of energy tunnel are simulated by adjusting the
heat exchange power. The calculation
results show that: (1) The larger the underground water seepage velocity, the
higher the thermal replenishment capacity of the strata, and the larger the
range of temperature affected by the energy tunnel; (2) Under the annual cycle
and daily cycle operation schemes, the larger the underground water seepage
velocity, the faster the temperature field around the tunnel reaches a stable
state; (3) When compared with the annual cycle heat exchange scheme, the daily
cycle heat exchange scheme can significantly reduce the temperature variation
range of the formation, although it cannot effectively improve the thermal
recharge capacity of the formation; (4) By optimizing the cooling or heating
power and duration, the temperature of the surrounding strata of the energy
tunnel can be restored to initial state after one year cycle, thus improving
the operation efficiency of energy tunnel and reducing the impact of energy
tunnel on the strata environment.
BI Jinfeng, JIANG Hong, DING Wenqi, BAO Heli, MIAO Lun
. Research on Ground Heat Recharge Capability in Heat
Exchange Process of Energy Tunnel[J]. Tunnel Construction, 2023
, 43(S1)
: 163
-170
.
DOI: 10.3973/j.issn.2096-4498.2023.S1.019
