# Evaluating the Energy-Saving Potential of Solar Dedicated Ventilation Systems Based on ADRC
## 7 Conclusions  
A photovoltaic and solar thermal system combined with a dedicated ventilation system was proposed in this paper. These three systems were combined to realize energy conversion, management, and energy-saving compared with former systems. The photovoltaic system supplies all the electrical power and the solar thermal system supplies all the thermal energy to the proposed solar dedicated \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**No.**} & \multirow{2}{*}{**System**} & **Initial** & **Needs** & **Payback** & **Advantage** & **Disadvantage** \\  & & **(RMB)** & **or Not** & **Period** & **Advantage** & **Disadvantage** \\ \hline \multirow{2}{*}{1} & Conventional system & 265,000 & No & – & Minimum system & Maximum electrical power consumption \\  & & Heat pipe heat & & & Precool and reheat & \\  & exchanger combined & & & & without additional & Heat pipe cannot \\
2 & with dedicated ventilation system & & & energy consumption & be controlled \\  & & Proposed solar & & & Renewable energy & Affected by weather \\
3 & dedicated ventilation system & & & and accurate & conditions and \\  & & & & control & geographic location \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Comparison between three different systems. ventilation system. The dedicated ventilation system processes fresh air and return air and supplies it to the indoor chamber to meet the sensible load and latent load requirements. An ADRC was designed to realize intelligent and precise control and was used for the experimental system. In order to evaluate the control accuracy and calculate the energy-saving potential of the proposed system when it is used in the summer in most of China or southern China, an experimental system was installed and tested to assess its characteristics under different outdoor and indoor conditions. The results were used for a comparison between the proposed system and former systems, which are a conventional system and a heat pipe heat exchanger combined with a dedicated ventilation system. Moreover, they were applied to confirm that the proposed solar dedicated ventilation system has maximum energy-saving potential compared to the previous systems. The experimental results show that the temperature standard deviation is from 0.09 to 0.15 \({}^{\circ}\)C at different outdoor conditions. This means the proposed system based on ADRC has high control accuracy. The temperature difference between maximum and minimum is from 0.33 to 0.49 \({}^{\circ}\)C (<0.5 \({}^{\circ}\)C) at different outdoor conditions. Standard deviation and temperature difference between maximum and minimum are the lowest at 25 \({}^{\circ}\)C, 50%, 0.1 m\({}^{3}\)/s and the highest at 35 \({}^{\circ}\)C, 80%, 0.3 m\({}^{3}\)/s. The results show that the various outdoor conditions (T, RH, and airflow rate) influence the control accuracy of the proposed solar dedicated ventilation system. The results also indicate that solar energy has replaced traditional energy and the energy-saving potential of the proposed system equals the power consumption of traditional systems, excluding extreme conditions. Furthermore, the actual operating cooling system for a laboratory was evaluated and the performance was compared with the former systems. The energy-saving potential could reach 58.43 W/m\({}^{2}\) and standard coal consumption and CO\({}_{2}\) emissions could be reduced by 64.31 and 160.32 kg/m\({}^{2}\) compared with the conventional system. The payback period of the proposed system is 5.32 years. Nevertheless, there are some shortcomings, which are higher initial investment and longer payback period for the proposed system. Finally, the proposed solar dedicated ventilation system based on ADRC, which has the most energy-saving potential and control accuracy, could be used for areas with abundant solar energy resources to achieve economic and environmental benefits. [PERSON] covered all the research of this study. [PERSON] designed the ADRC and proposed the solar dedicated ventilation system.