Design Scheme for Solar Hot Water Project of Chonghua Boutique Mansion in Dongguan City 
1、 Project Background 
In the context of advocating green environmental protection, energy conservation and emission reduction, solar energy, as a clean and renewable energy source, has been widely used in the field of building hot water supply. Dongguan Chonghua Boutique Mansion, as a high-quality residential place, has high requirements for the stability, efficiency, and environmental friendliness of hot water supply. This plan adopts a 164 square meter Megaray flat panel solar collector, aiming to create an energy-saving, environmentally friendly, and stable hot water supply system for the mansion, meeting the daily hot water needs of residents. 
2、 Design Basis 
1. The architectural drawings and hot water demand parameters provided by Chonghua Boutique Mansion include information on the number of residents, daily hot water usage, and peak water usage periods. 
2. Local meteorological data in Dongguan, such as solar irradiance, temperature, and sunshine duration, are important criteria for evaluating the performance of solar energy collection systems. 
3. Relevant national standards and industry norms, such as GB 50364-2018 "Technical Standards for Application of Solar Water Heating Systems in Civil Buildings" and GB/T 19141-2011 "Technical Conditions for Household Solar Water Heating Systems", ensure that the design meets safety, quality, and energy-saving requirements. 
3、 Advantages of Megaray flat panel solar collectors 
1. High efficiency heat collection performance: The film absorption ratio of Megaray flat panel solar collectors is as high as 97%, which can efficiently absorb solar radiation energy and convert it into thermal energy. Under sufficient lighting conditions in Dongguan, the heating performance is excellent, reaching 34.49 ℃, which can quickly heat cold water and meet the large demand for hot water in the mansion. Whether it's daily grooming, bathing, or other daily hot water usage scenarios, it can ensure sufficient hot water supply. 
2. Good insulation performance: Advanced insulation technology is adopted, and its insulation performance reaches 1.98 ℃, with a total heat loss coefficient of only 4.8W/cm ². Even in low light conditions such as night or cloudy days, it can effectively reduce heat loss, maintain the temperature of hot water in the water tank, and ensure that there is always hot water supply. This feature ensures that residents of the mansion can enjoy stable hot water temperature at different times, improving their quality of life. 
3. Reliable quality assurance: Megaray flat panel solar collectors, household solar water heaters, and central hot water engineering systems have all obtained national authoritative testing reports, and product quality has been strictly inspected. So far, nearly 1000000 square meters of Megaray collectors have been serving customers, and their stability and reliability have been widely verified in the market. Choosing Megaray products for Chonghua Boutique Mansion can ensure the long-term stable operation of the hot water system, reduce maintenance costs and failure risks in the later stage. 
4. Diversified board core technology: We have diversified board core welding technologies, such as ultrasonic, laser, tube penetration, blowing and expanding, etc. The copper aluminum composite plate core is welded with copper welding rods imported from the United States, which can withstand a pressure of up to 12Kg and has a stability that is more than 20% higher than that of ordinary processes. T2 pure copper tube serves as the medium flow channel, which is hygienic, stable, and corrosion-resistant, ensuring the long-term stable operation of the system. This advanced core technology ensures the efficient operation and long service life of the collector in complex environments. 
5. High transmittance and high-strength glass: Adopting flat plate collector specific textured tempered glass, the transmittance can reach 92-94%, greatly improving the penetration of infrared light waves and enhancing the overall performance of the collector. This type of glass can withstand a static pressure of 750 kg and is not easily damaged during transportation and use. Even if damaged, it will not easily cause personal injury, ensuring the safety of the mansion during use. Whether in daily use or in response to special situations such as severe weather, it can ensure the safe and stable operation of the collector. 
6. Environmentally friendly insulation system: The standard plate engineering collector adopts an environmentally friendly EPS glass wool insulation system, with insulation performance exceeding national standards. In specially customized collectors, Megvii integral foam insulation technology can also be used, combined with infrared reflection insulation technology, with insulation parameters close to insulated water tanks, effectively improving energy utilization efficiency and reducing environmental impact. This not only conforms to the concept of green environmental protection in Gongguan, but also helps to reduce long-term operating costs. 

4、 System Design 
1. Determination of collector area: Based on the daily hot water demand of the mansion, the annual average daily solar radiation on the local collector lighting surface, the solar energy guarantee rate, the annual average heat collection efficiency of the collector, and the heat loss rate of the storage tank and pipeline, the required collector area of 164 square meters is calculated through a formula. The formula is: A =  rac{Q_{w} imes C imes (t_{r} - t_{l}) imes f}{J_{T} imes eta_{cd} imes eta_{l}}， Among them, A is the area of the collector, Q_ {w} is the daily hot water demand, C is the specific heat capacity of water, t_ {r} is the temperature of hot water, t_ {l} is the temperature of cold water, f is the solar energy guarantee rate, J {T} is the annual average daily solar radiation on the daylighting surface of the collector, eta_ {cd} is the annual average heat collection efficiency of the collector, and eta_ {l} is the heat loss rate of the storage tank and pipeline. To meet daily hot water needs. 
2. Installation layout of collector: 
-Installation location: Combined with the structure of the mansion building, the collector is installed on the roof. The roof is open and unobstructed, able to fully receive sunlight. For buildings facing south, south by east, or south by west at an angle of no more than 30 degrees, the collector should be set facing south; For building parts facing south by east or south by west greater than 30 degrees, the collector should be set to face south by east or south by west less than 30 degrees to ensure optimal lighting for the collector. 
-Installation angle: The inclination angle of the collector should be consistent with the local latitude to obtain the maximum solar radiation. In the Dongguan area, this angle helps the collector to fully absorb solar energy in different seasons throughout the year. 
-Spacing design: The minimum distance between the collector and the shading material or between the front and rear rows of the collector, calculated and determined according to the formula D=H times cot α _ {s}, to avoid mutual obstruction and ensure that each collector can receive sufficient lighting. Where D is the spacing, H is the vertical distance between the highest point of the collector and the lowest point of the shading or rear collector, and α _ {s} is the solar elevation angle at noon on the local spring and autumn equinox. 
3. Design of hot water storage tank: 
-Volume determination: Based on the hot water usage pattern of the mansion, the heating capacity of the collection system, and other factors, the volume of the hot water storage tank is determined through integral curve calculation to ensure that the hot water demand during peak hours is met. The general calculation formula is V=Q_ {max} times K, where V is the volume of the water tank, Q_ {max} is the maximum hourly hot water consumption, and K is the safety factor. 
-Material selection: Made of stainless steel material, it has good corrosion resistance and extends the service life of the water tank. Stainless steel material can also ensure that water quality is not contaminated and meets the hygiene standards for domestic water. 
-Thermal insulation measures: the water tank adopts efficient thermal insulation materials, such as polyurethane foam, etc. The thickness of the thermal insulation layer is reasonably determined according to the size of the water tank and the local climate conditions, so as to reduce heat loss and maintain the temperature of hot water. 
4. Loop system design: 
-Circulation method: Forced circulation is used to circulate water between the collector and the thermal storage tank through a circulating water pump, ensuring that the heat absorbed by the collector is transferred to the tank in a timely manner. This circulation method can ensure the timeliness and stability of hot water supply. 
-Selection of circulating water pump: Select a low-noise and high-efficiency centrifugal circulating water pump, and make a reasonable selection based on the system's flow and head requirements to ensure smooth hot water circulation and meet the system's operational needs. The flow rate of the water pump should be determined based on the area of the collector and the demand for hot water, while the head should consider factors such as pipeline resistance and height difference. 
5. Auxiliary heating system: Considering the hot water demand during rainy weather or insufficient solar radiation in winter, electric heating auxiliary equipment is equipped. When the solar collector cannot meet the set water temperature, it automatically starts electric heating to ensure the stability of hot water supply. The power of electric heating equipment is determined based on factors such as the volume of the water tank and the required heating time, ensuring that water can be quickly heated to the appropriate temperature in emergency situations. 
6. Control system design: Equipped with an intelligent control system to monitor real-time parameters such as collector temperature, water tank temperature, and water level. Automatically control the start and stop of the circulating water pump and the operation of the auxiliary heating equipment according to the set program, achieve automated operation and precise control of the system, and improve the efficiency of system operation. For example, when the temperature of the collector is higher than a certain value of the water temperature in the tank, the circulating water pump will automatically start; When the water temperature in the tank is below the set lower limit and there is insufficient solar energy, the electric heating equipment will automatically start. 
5、 Construction plan 
1. Construction preparation: Organize construction personnel to familiarize themselves with construction drawings and plans, conduct technical briefings and safety training, and ensure that construction personnel understand project requirements, construction processes, and safety precautions; Prepare the necessary tools and equipment for construction, such as cranes, drills, wrenches, level gauges, etc., and check their performance for good condition; Check the site conditions of the construction site to ensure that the construction conditions are met, such as leveling the site, clearing obstacles, etc; Inspect and accept the materials to ensure their quality meets the requirements, transport them to the designated location on the construction site for storage, and take appropriate protective measures. 
2. Bracket installation: According to the design drawings, lay out lines and position them at the installation location to determine the installation position of the bracket; Assemble the bracket using hot-dip galvanized steel and weld or bolt it as required to ensure a stable structure that can withstand the weight of the collector and external forces such as wind; Use a spirit level and measuring tools to accurately adjust the bracket, ensuring that the levelness and inclination of the bracket meet the design requirements, so that the collector can achieve the best heat collection effect after installation. After the installation of the bracket is completed, conduct a quality inspection to ensure that the connection is firm and not loose. 
3. Installation of collector: Use a crane or hoist to lift the flat solar collector steadily and place it on the installed bracket; Use bolts and washers to securely connect the collector to the bracket, ensuring that the connection points are evenly stressed and the tightening torque meets the design requirements; During the installation process, pay attention to protecting the surface of the collector to avoid collisions and scratches, while ensuring that the installation direction of the collector is correct and easy to receive sunlight; According to the design drawings, install the connecting fittings, including copper pipes, elbows, tees, valves, etc., using high-quality sealing materials to ensure that there is no leakage at the connection and that the medium flows smoothly; Install temperature sensors, controllers, and other components of the intelligent temperature control system, connect the relevant circuits, and ensure that the control system can accurately monitor and control the operating status of the collector. After the installation of the collector is completed, conduct a comprehensive inspection to ensure that the installation quality meets the requirements. 
4. System debugging: After completing the system installation, conduct a comprehensive safety inspection, including the fastening of connection points, the sealing of pipelines, and the safety of the electrical system; Start the control system, conduct preliminary debugging and operational testing of the heat collection system, observe the working status of the collector, record relevant data such as hot water heating temperature, water pump operation, etc; Based on the test results, necessary adjustments and optimizations will be made to the collector and control system to ensure that the system can operate normally and stably, achieving the designed hot water supply effect. During the debugging process, promptly resolve any issues discovered to ensure the reliable operation of the system. 
6、 Benefit analysis 
1. Energy saving benefits: As a clean energy source, solar energy can greatly reduce dependence on traditional energy sources (such as natural gas, electricity, etc.) and lower energy consumption when the system is put into use. According to statistics, compared with traditional hot water supply methods, it can save a lot of energy costs every year and achieve good energy-saving and emission reduction effects. Based on the hot water usage of the mansion, a certain amount of carbon emissions can be reduced annually, contributing to environmental protection. 
2. Economic benefits: In the long run, although the initial investment in solar hot water systems is relatively large, the economic benefits of energy cost savings will gradually be reflected as the service life increases. At the same time, the system has high stability, low maintenance costs, and reduces later operational costs. Generally speaking, the service life of solar water heating systems can reach 15-20 years, during which the energy cost saved will exceed the initial investment cost. 
3. Environmental benefits: The use of solar hot water systems does not produce greenhouse gases and pollutants, conforms to environmental protection concepts, helps reduce carbon emissions, and contributes to environmental protection. This not only meets the requirements of society for green buildings, but also enhances the brand image and market competitiveness of the mansion. 
7、 After sales service 
1. Provide professional training services to explain in detail the working principles, operating methods, and daily maintenance points of the system to the management and maintenance personnel of the mansion, ensuring that they can operate and maintain the system correctly. The training content includes equipment start stop, fault diagnosis, simple maintenance, etc. Through a combination of theoretical explanation and practical operation, relevant personnel are proficient in the use and maintenance skills of the system. 
2. Establish a comprehensive after-sales service system, conduct regular follow-up and maintenance of the system, and promptly solve any possible problems. After receiving the fault report for repair, respond within the specified time and arrange for technical personnel to go to the site for maintenance. Establish a dedicated after-sales service hotline to ensure that users can promptly contact after-sales personnel and provide 24-hour technical support when encountering problems. 
3. Reserve sufficient spare parts to ensure timely replacement in case of equipment failure and reduce system downtime. Establish good cooperative relationships with suppliers to ensure the quality and timely supply of spare parts. At the same time, regular inventory and replenishment of commonly used spare parts are carried out to ensure sufficient inventory.