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Energies 2022, 15, 6385 The experiment could only simulate the cooling condition of GCHP (rejecting heat to the rock) since it was hard to cool the rock using cooling devices that mock the heat ex- change pipes, and it was very difficult to artificially create two fractures in the rock model. Therefore, the laboratorial experiment was used to investigate the case of thermal input to the rock mass without fracture (NF) and a horizontal fracture (F1), while the heating conditions of GCHP and the case of two fractures were simulated by the numerical simu- lation. B Figure 2. Distribution of the drilling positions. The red points are the heater’s locations, and the Figure 2. Distribution of the drilling positions. The red points are the heater’s locations, and the blackpoiinttssaarreeththeeththeremrmomometetrelrolcoactiaotniosn. (sA. ()Ad)iadgiragmraomf tohfethoeptpolpanpolafnthoefrtohcekrmocakssmexapssereimxpeenrti;ment; (B)distriibuttiionncchhaartrtoofftetmemppereartautruermemonointoirtoinrginpgopinotisn.ts. AThreocinkitmiaalstsemwpitehraotnuerehboerifzoorentahlefirmacptulerme wenatsatbiounilto(fFtihgeuerxep3e)r.iTmhenitnwteagsraretecdorrdoecdk,and mthaesesxmpoedrieml wenatswcuatsatterthmeindaeptetdh owfh0e.1n2tmhe, wteimthpoenraetsuidrecfurnvcetionfitnhgearsoackwmataesrseanptrparnocaeched aenqduitlhiberioutmhe.rTahseasnuerxfaitc.eTtheemoptehreartutwreoosfidthese wroecrke mseaslesdanwditihnpmuictahegalutewteorenaslusorerethpeorted water did not flow outside. The parameters of this model were the same as those of the non-fracture model. The water was controlled by the thermostat at 288.15 K, and the rate The experiment could only simulate the cooling condition of GCHP (rejecting heat of water flow was maintained at 0.005 mm/s by the flow counter. to the rock) since it was hard to cool the rock using cooling devices that mock the heat exchange pipes, and it was very difficult to artificially create two fractures in the rock model. Therefore, the laboratorial experiment was used to investigate the case of ther- mal input to the rock mass without fracture (NF) and a horizontal fracture (F1), while the heating conditions of GCHP and the case of two fractures were simulated by the numerical simulation. A rock mass with one horizontal fracture was built (Figure 3). The integrated rock mass model was cut at the depth of 0.12 m, with one side functioning as a water entrance and the other as an exit. The other two sides were sealed with mica glue to ensure the Energies 2022, 15, x FOR PEER REVIEW water did not flow outside. The parameters of this model were the same as those of the non-fracture model. The water was controlled by the thermostat at 288.15 K, and the rate of water flow was maintained at 0.005 mm/s by the flow counter. Single fracture Figure 3. Specifications of the experimental rock mass with one horizontal fracture. Figure 3. Specifications of the experimental rock mass with one horizontal fracture. 2.4. Experimental Results and Discussion 5 of 15 4 of 13 from the data recorder. A The recorded data were imported into the processor to draw the temperature contour maps at different depths. The left column in Figure 4 shows the temperature fields at dif- ferent depths (0.1 m, 0.2 m, and 0.3 m) in the rock mass without fracture, and the right Water outlet Water inlet column shows the temperatures field at the same depths in the rock mass with a horizon-PDF Image | Research on the Application of Fracture Water
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