Proposal for Hot Water Project of Peihong Ethnic Middle School in Nanning City 
1、 Project Overview 
As an important educational institution, Peihong Ethnic Middle School in Nanning has a significant demand for hot water supply. The purpose of this hot water project is to provide stable, sufficient, and comfortable hot water services for all teachers and students in the school, and to improve the quality of campus life. After comprehensive consideration, Megaray brand flat solar collectors with an area of 986 square meters were selected to meet the hot water demand of the school. 
2、 Design principles 
1. Safe and reliable: The system design strictly follows relevant national safety standards and is equipped with multiple safety protection devices, such as leakage protectors, overload protectors, safety valves, etc., to prevent accidents such as hot water leakage, burns, and leakage, ensuring the safety of teachers and students. 
2. Energy saving and environmental protection: Megaray flat panel solar collectors utilize solar energy as a clean energy source to reduce conventional energy consumption and carbon emissions. At the same time, the system adopts efficient insulation materials and energy-saving equipment to reduce heat loss and operational energy consumption, which is in line with the concept of environmental protection and energy conservation. 
3. Economic rationality: On the premise of meeting the demand for hot water supply, plan equipment selection and system layout reasonably, comprehensively consider factors such as initial investment, operating costs, and maintenance costs, and achieve maximum economic benefits. 
4. Convenient and practical: The hot water supply system is easy to operate and can meet the hot water usage needs of different time periods and places, providing convenient and comfortable hot water services for teachers and students. 
5. Scalability: The system design reserves a certain amount of expansion space, so that in the future, the hot water supply system can be flexibly adjusted and expanded according to the development of the school and the increase in student numbers. 
3、 Advantages of Megaray flat panel solar collectors 
1. Efficient heat collection: The film layer has an absorption rate of 95 ± 2%, which can fully absorb solar energy and efficiently convert it into heat energy, rapidly increasing water temperature. 
2. Strong insulation: Adopting seamless frame backboard technology, combined with environmentally friendly EPS glass wool insulation system or polyurethane overall insulation, infrared reflective film insulation technology, the insulation effect is improved by more than 15%, reducing heat loss and maintaining stable water temperature. 
3. High quality materials: 
-The core of the board is made of copper aluminum composite material, welded with copper bars imported from the United States, and its stability is more than 20% higher than that of ordinary processes. T2 pure copper tube serves as a medium flow channel, which is hygienic, stable, and corrosion-resistant. It can withstand a pressure of 12Kg and is suitable for engineering applications of all sizes. 
-Select high transmittance (up to 92-94% transmittance) and high-strength flat plate collector special textured tempered glass, which can withstand a static pressure of 750Kg, improve the penetration of infrared light waves, enhance the overall performance of the collector, and is not easily damaged during transportation and use, with high safety. 
-Selected alloy galvanized steel plate is used as the special galvanized back plate for flat solar water heaters, which has good adhesion and weldability, corrosion resistance, no rust, and long service life. 
4. Diversified technology: Innovative metal elastic sealing technology (EPDM) strengthens the sealing of the collector, with higher reliability and lifespan than rubber strips, while also contributing to the insulation performance of the collector. Provide diversified core welding technologies (ultrasonic, laser) for selection. 
5. Quality assurance: After national authoritative testing, the quality parameters are higher than national standards, making it more reliable to use and helping the project stand out among numerous competitive solutions. 
4、 System composition 
1. Solar collection part: It consists of 986 square meters of Megaray flat panel solar collectors, which are arranged and installed reasonably according to the actual layout of the school building roof to ensure sufficient reception of sunlight. The collector is connected through pipelines to form a heat collection network, which converts the absorbed solar energy into thermal energy and heats the heat transfer medium inside the pipeline. 
2. Hot water storage section: Equipped with a large capacity stainless steel insulated water tank for storing heated hot water to meet the demand during peak water usage periods. The water tank is made of high-quality stainless steel material, which is corrosion-resistant and high-temperature resistant; Has good insulation performance and reduces heat loss. The water tank is equipped with a water level control system and a temperature monitoring system to real-time monitor the water level and temperature inside the tank. 
3. Circulating system: including circulating water pump and circulating pipeline. The circulating water pump is responsible for transporting the water in the water tank to the solar collector for heating, and then returning the heated hot water to the water tank to form circulating heating, ensuring uniform water temperature in the water tank. High quality pipes are selected for the circulation pipeline to ensure smooth hot water circulation and reduce energy loss. 
4. Control system: Adopting an intelligent control system, it can achieve automated operation. It can automatically control the start and stop of the circulating water pump, switch between the solar collector and auxiliary heating equipment based on parameters such as water temperature and water level. Equipped with fault diagnosis and alarm functions, it monitors the system's operating status in real time. Once a fault is detected, it promptly issues an alarm and displays fault information, making it convenient for maintenance personnel to quickly troubleshoot and repair. 
5. Auxiliary heating part: Considering the decrease in solar energy collection efficiency during rainy weather or insufficient sunlight, auxiliary heating equipment such as air source heat pumps should be configured. When solar energy cannot meet the demand for hot water, the auxiliary heating equipment automatically starts to supplement and heat the hot water, ensuring a stable supply of hot water 24 hours a day. 

5、 System operation process 
1. Daily operation: When there is sufficient sunlight, the solar collector absorbs solar energy and heats up the heat transfer medium inside the pipeline. The circulating water pump is started to transport the low-temperature water in the water tank to the collector, and the heated high-temperature water flows back to the water tank for storage. When the water temperature in the water tank reaches the set upper limit, the circulating water pump automatically stops; When the water temperature drops to the set lower limit, the circulating water pump starts again to maintain the water temperature in the water tank within the appropriate range. 
2. Water usage process: Teachers and students turn on hot water faucets in dormitories, bathrooms, and other places. The hot water in the water tank is transported to the water point through the water supply pipeline for use by teachers and students. The water supply pipeline adopts a reasonable diameter and layout to ensure stable hot water supply pressure and sufficient water flow. 
3. Auxiliary heating start: When encountering continuous rainy weather or severe lack of light, and the water temperature in the water tank cannot reach the set operating temperature, the control system automatically starts the auxiliary heating equipment to heat the hot water in the water tank until the water temperature meets the requirements. 
4. Night operation: If there is no sunlight at night, and the hot water storage and temperature in the water tank meet the demand for use the next morning, the system will be in insulation standby mode; If the water temperature drops significantly or the hot water storage is insufficient, the auxiliary heating equipment will automatically start for heating to ensure sufficient hot water supply in the morning. 
6、 Installation and maintenance 
1. Installation: Construction is carried out by a professional installation team, strictly following the design plan and relevant installation specifications. At installation locations such as school roofs, ensure proper foundation fixation to ensure that the collector is securely and stably installed; Reasonably lay pipelines, ensure tight and leak free connections, and take insulation and protective measures for pipelines; Correctly wiring and debugging electrical equipment such as control systems to ensure the overall normal operation of the system. After installation, comprehensive debugging and testing will be carried out, including heat collection efficiency testing, water temperature and level monitoring, circulation system operation testing, auxiliary heating equipment testing, etc., to ensure that all indicators meet the design requirements. 
2. Maintenance: Establish a comprehensive maintenance system and regularly inspect and maintain the hot water engineering system. 
-Daily maintenance: Conduct daily inspections of the system's operation status to check for any water leakage, electric leakage, abnormal equipment noise, etc; Check if the water temperature and level display are normal, and if the control system operates sensitively. 
-Regular maintenance: Clean the surface of the collector monthly to remove dust and debris, ensuring efficient heat collection; Check the operation status of pipelines, valves, water pumps and other equipment every quarter, and carry out necessary maintenance and repair, such as adding lubricating oil to water pumps and replacing vulnerable parts; Every year, the entire system is comprehensively inspected and maintained, including cleaning the water tank, checking the insulation performance, and conducting performance testing and maintenance on auxiliary heating equipment. 
7、 Economic Benefit Analysis 
1. Energy saving benefits: Megaray flat panel solar collectors use solar energy for heating, reducing dependence on traditional energy sources such as electricity and gas. Compared to simply using electric or gas heating for hot water systems, it can significantly reduce energy consumption, and long-term operation can save schools a lot of energy costs. 
2. Operating costs: In addition to reducing energy costs, the maintenance costs of the system are relatively low. Megaray flat panel solar collectors have reliable quality and long service life, reducing the cost of frequent equipment replacement. Intelligent control systems can achieve automated operation and reduce manual management costs. 
3. Investment payback period: Based on factors such as the initial investment of the system, annual energy savings, and maintenance costs, the estimated investment payback period for this hot water engineering system is around [X] years (specific values need to be calculated in detail based on actual investment and operational data). With the rise of energy prices and the stable operation of the system, the economic benefits will become more significant in the later stage. 
8、 Conclusion 
This plan uses Megaray brand flat panel solar collectors to construct the hot water project of Peihong Ethnic Middle School in Nanning City, fully leveraging the advantages of high-efficiency heat collection, strong insulation, safety and reliability, energy conservation and environmental protection of solar collectors. The system design is reasonable, covering various parts such as heat collection, storage, circulation, control, and auxiliary heating, ensuring stable, sufficient, and comfortable hot water supply for teachers and students in the school. Meanwhile, from the perspective of economic benefits analysis, this plan has good energy-saving effects and low operating costs, with promising investment return prospects. By implementing this plan, the logistical support level of the school will be effectively improved, creating a better living and learning environment for teachers and students.