# Research on Real-Time Control Strategy for HVAC Systems in University Libraries
## 3 Experimental Cases
### Device Model and Objective Function
#### 3.2.4 Collection of Equipment Data
 \\ \hline
1 June 2024 & 26.4 & & 1003.2 & 0 & 112.23 & 103.44 & 0 \\ \hline
2 June 2024 & 27.7 & & 0 & 820.8 & 95.67 & 88.29 & 0 \\
3 June 2024 & 28.3 & mode & 1824 & 0 & 201.84 & 185.34 & 0 \\
4 June 2024 & 26.3 & & 483.2 & 0 & 55.14 & 50.64 & 0 \\
5 June 2024 & 24 & & 0 & 0 & 0.75 & 0.78 & 0 \\
6 June 2024 & 25.6 & & 560 & 0 & 61.5 & 56.34 & 0 \\ \hline
7 June 2024 & 27.3 & & 2443.2 & 0 & 273.21 & 249.57 & 0 \\
8 June 2024 & 29.2 & & 2035.2 & 0 & 217.2 & 199.11 & 0 \\
9 June 2024 & 26.5 & Energy-saving & 0 & 1840 & 228.9 & 209.13 & 0 \\
10 June 2024 & 25.8 & mode & 1856 & 0 & 216.51 & 197.61 & 0 \\
11 June 2024 & 28.6 & & 0 & 2193.6 & 223.29 & 203.7 & 0 \\
12 June 2024 & 31.4 & & 2438.4 & 0 & 228.48 & 208.59 & 0 \\
13 June 2024 & 32.5 & Energy-saving & 3209.6 & 0 & 272.1 & 248.28 & 0 \\
14 June 2024 & 33 & mode & 0 & 3422.4 & 265.5 & 242.13 & 0 \\ \hline
15 June 2024 & 33.9 & Original mode & 3870.4 & 16 & 524.88 & 482.67 & 0 \\ \hline
16 June 2024 & 32.2 & Equipment & 0 & 2240 & 183 & 167.22 & 0 \\
17 June 2024 & 30.4 & failure period 1 & 627.2 & 0 & 52.83 & 48.39 & 0 \\ \hline
19 June 2024 & 29.6 & & 0 & 3020.8 & 278.79 & 254.46 & 0 \\
19 June 2024 & 27.7 & Energy-saving & 0 & 2694.4 & 250.62 & 228.78 & 0 \\
20 June 2024 & 27.6 & & 2592 & 0 & 260.88 & 238.44 & 0 \\ \hline
21 June 2024 & 29.7 & & 3828.8 & 0 & 498.75 & 458.79 & 0 \\
22 June 2024 & 27.4 & & 3900.8 & 0 & 612.42 & 563.76 & 0 \\ \hline
23 June 2024 & 27.5 & & Energy-saving mode & 2260.8 & 0 & 236.4 & 215.97 & 0 \\ \hline
1\# & 2\# & 3\# Cooling water pump (kWh) & 1\# Cooling water pump (kWh) & 1\# tower (kWh) & 2\# Cooling tower (kWh) & Total (kWh) & 1\# Mean indoor temperature (\({}^{\circ}\)C) & 2\# Mean indoor temperature (\({}^{\circ}\)C) & 2\# Mean indoor (\({}^{\circ}\)C) \\ \hline
104.37 & 111.96 & 0 & 22.81 & 20.17 & 1478.18 & 25.2 & 25,6 \\
88.56 & 95.31 & 0 & 18.32 & 15.92 & 1222.87 & 25.3 & 25.8 \\
187.56 & 200.94 & 0 & 37  
failure during the operation, the test was interrupted and forced to stop. Although the energy-saving data from this project cannot be strictly verified according to the test standards, the actual operation data still reflect the energy-saving performance of the system to a certain extent. Therefore, this report only presents our self-test data, and the actual energy-saving effect test is subject to a subsequent three-party energy-saving report. Samples from the low-load period and equipment failure period were excluded. The target samples were selected from the remaining energy-saving mode period and the original mode period. The target samples on similar days must meet specific requirements, as outlined in Table 5.  
The samples were collected on the 18 th, 21 st, 22 nd, and 23 rd days in accordance with the testing requirements. Subsequently, the data were further segmented to extract the daily operational data from 9:00 to 17:00, as shown in Table 6.  
Based on the calculations for the above samples, Table 7 illustrates the energy-saving rate of the project. In conclusion, the initial findings indicate that the overall energy-saving rate of this project exceeded 35%. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Name**} & \multirow{2}{*}{**Data**} & \multirow{2}{*}{**Operation Mode**} & \multicolumn{1}{c}{**Mean Outdoor**} & \multicolumn{1}{c}{**1\# Mean Indoor**} & \multicolumn{1}{c}{**2\# Mean Indoor**} & \multicolumn{1}{c}{**Energy**} \\  & & & **Temperature** (\({}^{\circ}\)C) & **Temperature** (\({}^{\circ}\)C) & **Temperature** (\({}^{\circ}\)C) & **Consumption from** **9 to 17 (kWh)** \\ \hline \multirow{2}{*}{Sample1} & 18 June 2024 & Energy-saving mode & 29.6 & 25.8 & 27.2 & 3021 \\  & 21 June 2024 & Original mode & 29.7 & 25.1 & 26.3 & 5190 \\ \hline \multirow{2}{*}{Sample2} & 23 June 2024 & Energy-saving mode & 27.5 & 23.1 & 25.6 & 5244 \\  & 22 June 2024 & Original mode & 27.4 & 23.2 & 25.7 & 3247 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Experimental sample conditions and energy consumption.