High Insulation Solar Collector

I. Product Introduction

The high insulation solar collector (High Insulation Solar Collector) is specially designed for large-scale hot water projects and cold regions. It is the core component of hotels, schools, factories, hospitals, swimming pools, and regional heating systems. This product adopts laser welding technology, blue solar absorption film layer (blue titanium film), and thick insulation layer. It has high heat collection efficiency and extremely low heat loss, and is particularly suitable for regions with cold winters or large temperature differences in the morning and evening. 

The frame of the collector is made of high-strength aluminum alloy, and the cover plate is low-iron tempered glass (with a light transmittance of ≥ 91%). The heat absorption plate and the flow channel are perfectly fused through laser welding, with extremely low thermal resistance and a heat transfer efficiency that is over 15% higher than that of traditional welding. The heat absorption surface is covered with a blue solar absorption film layer (blue titanium film), with an absorption rate of ≥ 95%, an emissivity of ≤ 5%, and still efficient under low-light conditions. The bottom and the periphery are filled with high-density glass wool (thickness 40-50mm), combined with the low radiation property of the low-iron glass, the overall thermal loss coefficient (U value) of the machine is ≤ 4.0 W/(m²·K), and the thermal insulation performance is industry-leading. The product has passed Solar Keymark, CE, etc. certifications, meeting the EU and international standards. 

II. Technical Parameter Table

Product Model SWH-2.0 / SWH-2.5 (Single area 2.0/2.5 m²)

Applicable Scenarios Arctic regions, hotels, schools, factories, swimming pools, area heating 

Note : ① Rated efficiency: The total irradiance on the daylighting surface of the collector is 1000W/㎡, and the temperature difference between the average temperature of the collector and the ambient air temperature is 50°C. Calculate the efficiency value of the solar collector according to the instantaneous efficiency equation of the collector's daylighting area.

② Rated power: The total irradiance of the collector lighting plane is 1000w/㎡, and the collector power when the temperature difference between the average collector temperature and the ambient air temperature is 50 ° C is equal to the product of the rated efficiency and the day lighting area and 1000W/㎡.

III. Working Principle

The high insulation flat plate solar collector achieves stable heat collection through the greenhouse effect, laser welding for efficient heat transfer, and a high insulation structure: 

1. Solar thermal conversion: Sunlight passes through the low iron tempered glass and is directed onto the blue solar absorption layer. This coating efficiently converts solar radiation energy into thermal energy, heating the all-copper heat-absorbing panel. 

2. Rapid heat transfer: The heat-absorbing plate and the flow channel are formed into a continuous metallurgical bond through laser welding. The heat is transferred to the heat transfer medium (antifreeze or water) within the flow channel with an extremely low thermal resistance, causing the temperature of the medium to rise rapidly. 

3. Heat retention and storage: The high-density glass wool insulation layer (40-50mm) significantly reduces heat loss on the back and sides of the collector. The low-radiation property of the low-iron glass reduces top radiation heat loss, enabling the collector to maintain a relatively high outlet water temperature even in cold or low-light conditions. 

4. Cyclic Heating: Multiple collectors can be connected in series or in parallel to form a collector array. The heat is then transported to the water storage tank or end users through a circulating pump, meeting the requirements of large-scale projects. 

The high insulation design is particularly suitable for areas with large temperature differences between morning and evening and severe cold in winter, and it can effectively extend the daily effective heat collection period. 

IV. Product Advantages

1. Laser Welding, Efficient Heat Conduction

The laser welding technology enables the contact fusion between the heat-absorbing plate and the flow channel through surface contact. It has a low thermal resistance and no risk of delamination. The heat conduction efficiency is over 15% higher than that of ultrasonic welding, ensuring stable output for 20 years. 

2. Blue solar absorption film layer, highly efficient under low light conditions

The absorption rate of the blue titanium film coating is ≥ 95%, and the emission rate is ≤ 5%. It still efficiently collects heat even on cloudy days, in the morning, and in the evening, and the average daily heat collection is ahead of similar products. 

3. High insulation structure, ideal for cold regions

40-50mm high-density glass wool insulation layer + low-emissivity glass, the overall heat loss coefficient U value is ≤ 4.0 W/(m²·K), heat loss is 30% lower than that of ordinary flat panels, and the operation is more stable in winter. 

4. All-copper flow channels, resistant to pressure and corrosion

The heat absorption plate and flow channels are made of all-copper material. They can withstand a pressure of 0.6 MPa, are corrosion-resistant and frost-proof, and are suitable for closed-loop systems. The service life can last for over 15 years. 

5. Modular design, flexible engineering configuration

Each single collector can be freely combined to form a collector array, ranging from several square meters to several thousand square meters, meeting the needs of various large-scale hot water projects. 

6. International Certification, Export Assurance

The product has obtained Solar Keymark and CE certifications, meeting European standards, which helps engineering companies bid for overseas projects. 

V. Factory Advantages

Our company has been dedicated to the research and manufacturing of high insulation flat plate solar collectors for 15 years. We possess a fully automated laser welding production line and are a high-quality overseas OEM/ODM supplier. 

1. International certifications: ISO9001, ISO14001, Solar Keymark, CE. The products are exported to over 50 countries including Europe, Australia, North America, the Middle East and Southeast Asia. 

2. Laser welding expertise: We have introduced German technology for laser welding equipment, with a welding speed of 30m/min. The weld points are uniform and free from oxidation, the weld seam has high tensile strength, and 100% online inspection is available. 

3. High insulation technology: The entire interior is filled with high-density glass wool, combined with an aluminum foil reflective layer, achieving industry-leading heat loss coefficient. 

4. Core production: We have an absorption coating spraying line, a laser welding line, and an assembly line. The key processes are all independently completed, ensuring controllable quality. 

5. Customization capability: Supports OEM customization of collector size, frame color, insulation layer thickness, etc. 

6. Engineering Support: Offer design of collector arrays, pipeline calculations, installation guidance and technical training, providing a complete set of services for the engineering contractors. 

7. After-sales Guarantee: The product is covered by a 5-year warranty. An English manual, CAD drawings, and remote technical support are provided. 

VI. Installation Precautions

1. Orientation and Angle: Face south (north in the Southern Hemisphere), with an inclination of ±10° from the local latitude. In extremely cold regions, the inclination can be increased (latitude +10°) to facilitate the sliding of snow.

2. Array Spacing: The spacing between the front and rear collectors must ensure unobstructed access from 9:00 to 15:00 on the winter solstice. Generally, it is calculated based on 2.5-3 times the height of the collectors.

3. Pipeline Connection: Use a single-loop parallel design to ensure balanced flow for each collector. The circulation pipeline needs to be insulated (≥40mm), and an additional heating belt and anti-freezing protection should be installed outdoors.

4. Anti-freezing Measures: In cold regions, anti-freezing fluid (propylene glycol) must be used as the heat transfer medium, with the concentration adjusted according to the lowest temperature (-25℃ to -35℃).

5. Fixation Method: Use aluminum alloy or stainless steel brackets, firmly connected to the roof structure, with a wind resistance grade of ≥12.

6. Exhaust and Pressure Relief: Set an automatic exhaust valve at the highest point of the system and a drainage valve at the lowest point to prevent air blockage and facilitate maintenance drainage. 

VII. Application Cases

1. School: A 240m² array consisting of 120 high-thermal-insulation collectors, along with a 3000L water tank and a gas boiler for auxiliary heating, can provide 45°C hot water even when the outdoor temperature drops to -20°C in winter. The annual energy saving rate is 55%.

2. Apartment: 80 collectors + cross-seasonal storage water tank, meeting the hot water needs of 50 households throughout the year. The solar energy guarantee rate is 65%.

3. Factory: 100 high-thermal-insulation collectors, with an average efficiency still reaching 45% in winter, providing shower hot water for 500 employees. The investment payback period is 2.5 years.

4. Swimming Pool: 60 collectors for maintaining the constant temperature of the indoor swimming pool, combined with a heat pump, extending the swimming season by 4 months, and saving $8,000 in natural gas fees annually. 

VIII. Development Trends

1. High insulation becomes the standard in cold regions: As solar heating expands to higher latitudes and colder areas, the demand for low heat loss and high insulation collectors is growing rapidly.

2. Laser welding becomes widespread: Laser welding, due to its high heat transfer efficiency and stable quality, is gradually replacing ultrasonic welding and has become the mainstream process for high-end flat collector production.

3. Upgrade of blue coating layers: New types of nitrogen oxide titanium and other blue-black coatings have an absorption rate of up to 96% and an emissivity lower than 4%, further enhancing weak light performance.

4. Large-scale area heating: The combination of flat collector arrays and cross-seasonal heat storage is applied in regional centralized heating systems, and is rapidly developing in Europe and northern China.

5. Building integration (BIPV/T): High-insulation flat collectors are integrated with photovoltaics and building facades, moving from an "add-on" approach to a "constructive" one.

6. Intelligent monitoring: The collector arrays are equipped with flow, temperature, and pressure sensors and connected to the Internet of Things, enabling remote operation and fault warning. 

Summary: The High Insulation Solar Collector hot water project utilizes laser welding, blue solar absorption film layer, and high insulation structure as its core advantages, providing efficient and stable heat collection solutions for regions with severe cold climates and large-scale hot water projects worldwide. We sincerely invite overseas distributors, distributors, and engineering contractors to join hands and cooperate! 

Contact us immediately to obtain the quotation, engineering plan and channel cooperation policy for the high insulation flat plate collectors!