## 6 Conclusions
\begin{table}
\begin{tabular}{l c c c c c c c c} \hline \hline \multirow{2}{*}{**Stations**} & \multicolumn{3}{c}{**Basic Parameters**} & \multicolumn{3}{c}{**Optimal Parameters**} & \\ \cline{2-9}  & \multirow{2}{*}{**Tem (K)**} & **Fresh** & **O\({}_{2}\)** & **Fresh Air** & **O\({}_{2}\)** & **Basic Energy** & **Optimal Energy** & **Energy-Saving** \\  & & **Air** & **(m\({}^{3}\)/s)** & **Tem (K)** & **Fresh Air** & **O\({}_{2}\)** & **Consumption** & **Consumption** & **Rate (\%)** \\  & & **(m\({}^{3}\)/s)** & **(m\({}^{3}\)/s)** & **(m\({}^{3}\)/s)** & **(m\({}^{3}\)/s)** & **(kW)** & **(kW)** & **(kW)** \\ \hline Guangzhou & & & & 292 & 0.200 & & 55.61 & 39.32 & 29.29 \\ Chenzhou & & & & 292 & 0.230 & & 60.98 & 39.13 & 35.83 \\ Changsha & & & & 293 & 0.230 & & 58.68 & 38.47 & 34.44 \\ Wuchang & & & & 293 & 0.230 & & 49.33 & 35.48 & 28.08 \\ Zhengzhou & & & & 293 & 0.230 & - & 41.72 & 32.59 & 21.88 \\ Xi’an & & & & 292 & 0.250 & & 44.25 & 33.74 & 23.75 \\ Lanzhou & & & & 292 & 0.250 & & 35.24 & 28.44 & 19.30 \\ Xining & & & & 292 & 0.544 & & 18.58 & 16.52 & 11.09 \\ Delingha & & & & 293 & 0.544 & & 11.19 & 7.26 & 35.12 \\ Golmud & & & & 293 & 0.544 & & 12.03 & 7.77 & 35.41 \\ Nachtiai & & & & 294 & 0.270 & 0.036 & 84.85 & 39.02 & 54.01 \\ Wudaoliang & & & & 294 & 0.300 & 0.102 & 88.37 & 51.72 & 41.47 \\ Tuotube & & & & 294 & 0.300 & 0.102 & 85.16 & 49.28 & 42.13 \\ Tanggula & & & & 293 & 0.350 & 0.146 & 83.13 & 67.39 & 18.93 \\ Amdo & & & & 293 & 0.300 & 0.124 & 86.68 & 62.28 & 28.15 \\ Nagqu & & & & 293 & 0.300 & 0.102 & 88.14 & 54.30 & 38.39 \\ Damxuing & & & & 293 & 0.300 & 0.087 & 89.68 & 48.84 & 45.54 \\ Lhasa & & & & 293 & 0.270 & 0.063 & 93.55 & 41.52 & 55.62 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Calculation conditions and energy consumption at each station. **Author Contributions:** Methodology, X.C. ; Software, X.Z. ; Supervision, Y.W. ; Visualization, X.Z. ; Writing--original draft, X.Z. ; Writing--review & editing, Y.W. All authors have read and agreed to the published version of the manuscript. **Funding:** The National Natural Science Foundation of China (51476073, 51266004) and Gansu Province Natural Science Foundation (21)R7 RA304). **Institutional Review Board Statement:** Not applicable. **Informed Consent Statement:** Not applicable. **Data Availability Statement:** The original contributions presented in this study are included in the article, further inquiries can be directed to the corresponding authors. **Conflicts of Interest:** The authors declare no conflict of interest. **Nomenclature** \begin{tabular}{l l} O\({}_{2}\) & Oxygen \\ CO\({}_{2}\) & Carbon dioxide \\ ACS & Air-conditioning system \\ OSS & Oxygen supply system \\ OSV & Oxygen supply volume \\ FAV & Fresh air volume \\ PP & Partial pressure \\ ASP & Air supply parameter \\ \(k\) & Turbulent kinetic energy \\ \(\varepsilon\) & Turbulent kinetic energy dissipation rate \\ \(\Gamma\) & Diffusion coefficient \\ \(\phi\) & General variable \\ G\({}_{\rm k}\) & Turbulent kinetic energy shear \\ \(P_{\rm k}\) & Turbulent kinetic energy buoyancy \\ \(\eta_{\rm t}\) & Turbulent viscosity \\ \(\beta\) & Thermal expansion coefficient \\ \end{tabular}