Fig 1.
Schematic diagram of GCHP (heating mode).
Table 1.
Assumptions in calculation.
Fig 2.
Vertical fractures cross with a borehole.
Fig 3.
Accumulated height of vertical fracture crossing a borehole.
Fig 4.
Horizontal fracture crossing a borehole.
Fig 5.
Accumulated width of horizontal fracture crossing a borehole.
Fig 6.
Fractures cross over with the UHXZ.
Fig 7.
Heat flow rate per meter of borehole section in contact with water flow as a function of water velocity and value of W.R.
Fig 8.
Total heat flow rate of single borehole as a function of Fr.V.R. and W.R., fracture water velocity = 0.0005 mm/s.
Fig 9.
Required number of boreholes as a function of Fr.V.R. and W.R., fracture water velocity = 0.0005 mm/s.
Fig 10.
Heat flow per meter of borehole as a function of water velocity in horizontal fractures and Fr.H.R.
Fig 11.
Required number of boreholes as a function of Fr. H.R. and fracture water velocity.
Fig 12.
Annual temperature change of UHXZ as a function of water velocity and Fr.A.R.
Fig 13.
Total annual irreversibilities (entropy production) of UHXZ as a function of water velocity and Fr.A.R.
Fig 14.
Annual change of A.C. in UHXZ as a function of water velocity and Fr.A.R.