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perature system. Instant and accurate temperature data were monitored by thermal c o s a e e c w n h s h i c h Energies 2022, 15, 6385 sors, and curves were displayed on the electronical temperature recorder. The flow of the experiment system is shown in Figure 1. In the experiment, the electric heaters were firstly inserted into the rock mass to ulate the process of inputting thermal energy into the rock mass (cooling conditi GCHP in summer), and then the temperature of different locations in t3hoef 1r3ock mas transmitted by sensors to the recorder. The recorder monitored the temperature vari during the experiment with a frequency of 3 min. Then the data were processed to g ate 3D contour maps of the temperature field at different times. The temperature 2.2. Experiment System were fed back to the electric temperature controller. When the temperature was diff A total of 12 waterproof heating pipes with a length of 300 mm and a diameter of from the set point in the heating controller, the heating power was adjusted automati 10 mm were used to simulate the buried pipe of the heat exchanger in the experiment. A horizontal fracture was made in the rock mass to simulate the flow of the fracture The rock mass was heated by the heating pipes maintained at 303.15 K by the automatic and a flow meter was used to control the flow rate of the water. The facility had co temperature system. Instant and accurate temperature data were monitored by thermal ling, feedback, recording, and heating devices; it can conduct different tests when t sensors, and curves were displayed on the electronical temperature recorder. The flowchart perimental rock body is changed, so it can be considered as a platform. of the experiment system is shown in Figure 1. feedback 1 Supply running water Supply power 8 5 4 Rock mass feedback submit 2 1 Flowmeter 2Thermalmeter 3Water container 4Horizontal fracture 7 6 3 5Heater 6Recorder 7Temperature controller 8Power Figure 1. Flowchart of the experiment system. Figure 1. Flowchart of the experiment system. In the experiment, the electric heaters were firstly inserted into the rock mass to 2.3. Model Specifications simulate the process of inputting thermal energy into the rock mass (cooling condition of An integrated rock mass model without fractures was built with specification GCHP in summer), and then the temperature of different locations in the rock mass was m in length, 0.8 m in width, and 0.5 m in height. A total of 12 thermostatic heating transmitted by sensors to the recorder. The recorder monitored the temperature variation and 32 temperature monitoring holes were arranged inside the rock mass, and the dr during the experiment with a frequency of 3 min. Then the data were processed to generate depth was 0.3 m for each hole. The locations of the heating holes were arranged 3D contour maps of the temperature field at different times. The temperature data were fed Figure 2A. The numbered boreholes were temperature monitoring holes. The distan back to the electric temperature controller. When the temperature was different from the set tween the holes was 0.2 m, and the distance between the temperature monitoring point in the heating controller, the heating power was adjusted automatically. A horizontal and the thermostatic heating holes was 0.1 m. A series of thermal sensors were arra fracture was made in the rock mass to simulate the flow of the fracture water, and a flow to detect the temperature of the heating holes at the depths of 0.1 m, 0.2 m, and 0.3 m meter was used to control the flow rate of the water. The facility had controlling, feedback, recording, and heating devices; it can conduct different tests when the experimental rock body is changed, so it can be considered as a platform. 2.3. Model Specifications An integrated rock mass model without fractures was built with specifications of 1 m in length, 0.8 m in width, and 0.5 m in height. A total of 12 thermostatic heating holes and 32 temperature monitoring holes were arranged inside the rock mass, and the drilling depth was 0.3 m for each hole. The locations of the heating holes were arranged as in Figure 2A. The numbered boreholes were temperature monitoring holes. The distance between the holes was 0.2 m, and the distance between the temperature monitoring holes and the thermostatic heating holes was 0.1 m. A series of thermal sensors were arranged to detect the temperature of the heating holes at the depths of 0.1 m, 0.2 m, and 0.3 m from the surface of the rock mass, respectively (Figure 2B). In total, 111 temperature monitoring points were set to cover the rock mass model.PDF Image | Research on the Application of Fracture Water
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