## 3 Results and Investigations
### Performance Evaluation under Heating Operation  
The measurement of temperatures (plotted over time in Figures 5 and 6) was conducted under the same test conditions as those for the cooling operation mentioned in Section 3.1. Using the results obtained from the data logger of the system, the COP and power values are presented in Tables 5 and 6. \begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline  & \begin{tabular}{c} **Initial** \\ **Ground** \\ **Water** \\ **Temp.** \\ \end{tabular} & \multicolumn{3}{c}{\begin{tabular}{c} **Temperature of** \\ **Geothermal Side** \\ **Unitet** \\ \end{tabular} } & \multicolumn{3}{c}{\begin{tabular}{c} **Temperature of Load Side** \\ **Unitet** \\ \end{tabular} } & \multicolumn{3}{c}{\begin{tabular}{c} **Total** \\ **Power** \\ **Rate** \\ \end{tabular} } & \multicolumn{3}{c}{\
\begin{tabular}{c} **Consumption** \\ **Power** \\ **Rate** \\ \end{tabular} } & \multicolumn{3}{c}{
\begin{tabular}{c} **COP** \\ **Power** \\ \end{tabular} } \\ \hline NO/Units & \({}^{\circ}\)C & \({}^{\circ}\)C & \({}^{\circ}\)C & LPM & \({}^{\circ}\)C & \({}^{\circ}\)C & LPM & kW & kW & (-) \\ \hline
1 & 17.75 & 20.61 & 27.56 & 317.81 & 17.61 & 12.14 & 349.69 & 133.55 & 35.26 & 3.79 \\
2 & 17.63 & 20.44 & 27.33 & 318.14 & 17.22 & 11.79 & 349.47 & 132.58 & 35.13 & 3.77 \\
3 & 17.91 & 20.44 & 27.21 & 318.76 & 16.49 & 11.13 & 349.14 & 130.54 & 35.00 & 3.73 \\
4 & 17.64 & 20.46 & 27.32 & 318.73 & 17.05 & 11.63 & 349.64 & 132.37 & 35.18 & 3.76 \\
5 & 17.84 & 20.48 & 27.33 & 318.90 & 16.99 & 11.58 & 349.63 & 132.06 & 35.19 & 3.75 \\ \hline Average & 17.75 & 20.49 & 27.35 & 318.47 & 17.07 & 11.65 & 349.51 & 132.22 & 35.15 & 3.76 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Measured results of the BW SCW geothermal system cooling operation. \begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline  & \begin{tabular}{c} **Initial** \\ **Ground** \\ **Water** \\ **TEMP.** \\ \end{tabular} & \multicolumn{3}{c}{\begin{tabular}{c} **Temperature** \\ **of Geothermal Side** \\ **Unitet** \\ \end{tabular} } & \multicolumn{3}{c}{\begin{tabular}{c} **Temperature** \\ **of Load Side** \\ **Unitet** \\ \end{tabular} } & \multicolumn{3}{c}{\begin{tabular}{c} **Total** \\ **Power** \\ **Rate** \\ \end{tabular} } & \multicolumn{3}{c}{\
\begin{tabular}{c} **Consumption.** \\ **Power** \\ \end{tabular} } & \multicolumn{3}{c}{
\begin{tabular}{c} **COP** \\ **Power** \\ \end{tabular} } \\ \hline NO/Units & \({}^{\circ}\)C & \({}^{\circ}\)C & \({}^{\circ}\)C & LPM & \({}^{\circ}\)C & \({}^{\circ}\)C & LPM & kW & kW & (-) \\ \hline
1 & 17.72 & 28.37 & 35.08 & 305.69 & 15.60 & 10.63 & 346.39 & 120.11 & 38.35 & 3.13 \\
2 & 19.94 & 29.90 & 36.62 & 304.75 & 15.60 & 11.10 & 346.68 & 119.10 & 39.03 & 3.05 \\
3 & 19.98 & 30.45 & 37.14 & 306.05 & 16.28 & 11.35 & 346.58 & 119.06 & 39.29 & 3.03 \\
4 & 20.09 & 30.61 & 37.31 & 306.03 & 16.34 & 11.43 & 347.47 & 119.22 & 39.52 & 3.02 \\
5 & 20.54 & 31.01 & 37.71 & 304.36 & 16.46 & 11.53 & 348.26 & 119.83 & 39.74 & 3.02 \\ \hline Average & 19.65 & 30.07 & 36.77 & 305.38 & 16.06 & 11.21 & 347.08 & 119.46 & 39.19 & 3.05 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Measured results of the SCW geothermal system cooling operation. Figure 5: Temperature variation characteristics of the SCW and BW cross-mixing ground heat exchanger system during heating operation. Figure 6: COP characteristics of the SCW and BW cross-mixing ground heat exchanger system during heating operation. Figures 5 and 6 illustrate the temperature variation and COP characteristics during the heating operation using the SCW and balancing well underground heat exchangers. Compared with the results of Figure 5a, the variation in the temperature of Figure 5b was small, and the exit temperature on the geothermal side was higher than that of Figure 5a. As a result of comparative analysis of the inlet and outlet temperatures, the SCW underground heat exchanger exhibits higher characteristics than the cross-mixing balancing well underground heat exchanger as time passes during heating operation.