## 5 Conclusions and Recommendations for Further Work  
This paper examines a renewable energy source and presents a new design for a TEG panel, which is formed as a connection parallel and series of many TEG modules. In the current work, the conclusions are summarized as follows. * It is crucial in our designed TEG system to work at low-temperature differences which are considered to be given to using appropriate multi-layers of TEG modules to harvest more energy to yield greater output power with increased efficiency. The results of this design are very important for applications that are related to heat recovery. The significant difference between this system and PV solar panels is that this system can be used continuously during the day and night hours. Unlike solar systems that only operate during daylight hours because they depend on solar radiation, our system can function at night. The TEG panel can supply electricity since hot water is usually stored in tanks for the purpose of using it in the evening. Certainly, this will lower household electricity bills. From the experimental results:
* An important new idea emerges from this work. This is to heat water in two stages. The first time is when it passes through the cold side of a TEG panel, and the second time is in the solar water heater. * On a sunny day, solar radiation is abundant. This leads to an increased temperature of water in the solar water heater, and the TEG panel achieves its maximum \(\Delta T\). This will lead to maximizing the terminal voltage for the TEG panel. The heat exchangers for both sides of the panel are made of aluminum. This creates a non-uniform dissipation of heat at the hot and cold sides of the TEG panel. Thus, the development of power is more efficient. * During the experiment, the highest recorded efficiency for the system was 2.1%. The average voltage at the terminals of the TEG panel is 13.73 V, where the greatest and lowest voltages of 15.3 V and 12.51 V. The average power output was (23.92 W). These values may increase if more effective cooling is used. * The created system is an economical and eco-friendly type of renewable energy converter that can be used in hot places or even combined with other types of renewable energy sources to maximize the amount of power produced from clean and renewable sources overall. * The findings of this investigation demonstrate that the suggested system is superior to or on par with systems described in other published studies. The integration with other renewable energy sources such as photovoltaic panels to build a PV-TEG system will be considered in the future. A complete system will be researched to verify that the system harvests clean electrical energy. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**References**} & **No. of TEG** & **Maximum** & **Maximum of** & **Maximum** & **Source of Heat** \\  & **Modules** & **Output Power** & \(\Delta T\) & **Efficiency** & \\ \hline
[7] & 1 & 1.03 W & 38.6 \({}^{\circ}\)C & 1.81\% & Solar radiation focused by a Fresnel lens \\
[10] & 48 & 1.033 W & 39 \({}^{\circ}\)C & 2.218\% & Waste heat of a biomass engine \\
[11] & 18 & 5.6 W & 110 \({}^{\circ}\)C & Not specified & Hydrothermal power generation \\
[13] & 4 & 0.03 W & 32 \({}^{\circ}\)C & Not specified & Walls of a building \\
[14] & 1 & 3.13 W & 133 \({}^{\circ}\)C & 1.2\% & Not specified \\
[37] & 10 & 0.85 W & 58 \({}^{\circ}\)C & 2\% & Hot water \\
[38] & Not specified & 21.17 W & 40 \({}^{\circ}\)C & 0.68\% & Heat Storage \\
[39] & Not specified & 24.4 W & 100 \({}^{\circ}\)C & 0.87 \% & Humidified flue gas \\
[40] & 18 & 6.5 W & 61.5 \({}^{\circ}\)C & 0.55\% & Hot water \\ Proposed & 150 & 29.49 W & 42.35 \({}^{\circ}\)C & 2.1\% & Hot water pipelines \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Comparative analysis with earlier research. **Author Contributions:** Conceptualization, M.A.Q. and V.I.V. ; methodology, M.A.Q. ; software, M.A.Q. ; validation, M.A.Q., S.E.S. and V.I.V. ; formal analysis, M.A.Q. and V.I.V. ; investigation, M.A.Q.