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Energies 2022, 15, 6385 5 of 13 2.4. Experimental Results and Discussion 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 different depths (0.1 m, 0.2 m, and 0.3 m) in the rock mass without fracture, and the Energies 2022, 15, x FOR PEER REVIEW right column shows the temperatures field at the same depths in the rock mass with a horizontal fracture. 6 of 15 Figure 4. Plane temperature distribution of the rock mass at depths of 0.1 m, 0.2 m, and 0.3 m: the Figure 4. Plane temperature distribution of the rock mass at depths of 0.1 m, 0.2 m, and 0.3 m: the left column is a rock mass without a fracture (NF); the right column is rock mass with one horizontal left column is a rock mass without a fracture (NF); the right column is rock mass with one horizontal fracture (F1), and the rows correspond to different depths. fracture (F1), and the rows correspond to different depths. Figure 5A,B are the curves of instantaneous temperature at the center of the rock By comparing the two columns, it can be seen that the highest temperature of the non- mass by the end of the simulated cooling period. They were measured at the depths of 0.1 fracturedrockmmas,s0.w2ams,iandth0e.3cemn,terer,spwehcticvhelwy.aTshreemdueacseudrewdhtemnpfrearcatureswinatherepmroedselnwteidth.ahori- The overall tempzoenratatul freacfituerlde woefrtehleowhoeritzhoanthalatsingthlenfroanc-tfruarceturroecrkocmkamsassws allstahfefeticmted. Mbeyanwhile, thefracturewatethr,easnlodpethtemhpigehraetsutretecmurpversaotfutrheemhorvizeodnstalilgshintglyleaflroanctgurteherodckirmecatsiosnmofnitthoeringhole fracture water flow. were gentler than those of the non-fracture rock mass, indicating that the temperature increased more slowly due to the improved heat capacity of the rock mass brought by the By comparing the highest temperature difference at the same depth, the effect of fracture water. flowing water in mitigating heat accumulation is obvious. The temperature difference was 7.5 K at the depth of 0.1 m (first row in Figure 4a,d); the temperature difference was 7.5 K at the depth of 0.2 m (second row in Figure 4b,e); and the temperature difference was 2.5 K at the depth of 0.3 m (3rd row in Figure 4c,f). One should note that the horizontal fracture was set to be 0.12 m deep; therefore, the cooling effect of the fracture water flow was more obvious at the region close to the fracture. As the distance increased, the impact of the fracture water significantly reduced. Therefore, the horizontal fracture flow only affected the region immediately around it.PDF Image | Research on the Application of Fracture Water
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