Double-pass Evacuated Tube Air Collector

1. Extreme Climate Resistance, Zero Damage Risk

2. Top-tier Thermal Efficiency, Energy Saving & Cost Reduction

3. Maintenance-free Design, Ultra-long Service Life

4. Strong Adaptability, Full-scenario Coverage

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Global Solar Heating Dilemma: Why Traditional Collectors Fail to Meet Global Needs?

For global buyers, engineers and project owners, solar heating selection has long been plagued by unavoidable pain points: liquid-based solar collectors are prone to freezing crack, pipe burst and thermal shock breakage in extreme climates; low heat collection efficiency leads to high energy consumption and increased operating costs; complex maintenance requires long-term labor and maerial input; poor adaptability cannot match high-altitude, severe cold or high-temperature drying scenarios. These problems not only increase project investment risks but also affect the long-term stability of heating systems.

To solve these global industry pain points, Soletks Group launched the DVC Double-pass Evacuated Tube Air Collector – a solar heating solution designed for global multi-scenario applications, with air as the heat transfer medium, integrating three core technological innovations to perfectly solve the drawbacks of traditional products and become the preferred choice for global solar heating projects.

Targeted Solutions: How DVC Series Solves Global Core Pain Points?

Pain Point 1: Freezing Crack, Pipe Burst & Thermal Shock Breakage in Extreme Climates

Solution: Air Heat Transfer + Expansion Joint Structure, Zero Risk of Damage

• Abandon traditional liquid working fluids, adopt air as the core heat transfer medium, which is not affected by severe cold or freezing, and fundamentally eliminates equipment damage caused by liquid freezing and expansion – suitable for low-temperature regions with -30℃ extreme weather and high-altitude areas with large temperature differences.

• Equipped with all-glass double-pass evacuated tubes with expansion joint structure, the head-to-tail through design not only minimizes air flow resistance and ensures sufficient air volume but also effectively buffers thermal stress caused by alternating hot and cold, completely avoiding vacuum tube breakage due to thermal shock. It can operate stably in both severe cold and high-temperature environments.

Pain Point 2: Low Heat Collection Efficiency & High Operating Costs

Solution: Top-tier Coating Technology + High Conversion Efficiency, Energy Saving & Cost Reduction

• Adopt professional magnetron sputtering interference coating technology, with solar absorptance up to 93% (±2%@AM1.5) and emissivity only 6% (±2%@80℃), maximizing solar energy capture and minimizing heat loss – the photothermal conversion efficiency of the system exceeds 80%, far higher than the 60%-70% of traditional products.

• The system operates entirely on solar energy, eliminating electricity and gas costs. For commercial buildings, industrial workshops and drying rooms with long-term heating needs, it can greatly reduce long-term operating expenses and shorten the investment return cycle, bringing considerable economic benefits to global customers.

Pain Point 3: Complex Maintenance & Short Service Life

Solution: Maintenance-free Design + Durable Structure, Lifelong Worry-free Use

• No liquid working fluids mean no risks of leakage, corrosion or medium replacement. The equipment requires no manual maintenance throughout its life cycle, saving global customers a lot of maintenance costs and labor input.

• With high-quality structural design and imported materials, the service life of the collector exceeds 50 years. It can withstand high temperatures up to 280℃ and low temperatures of -30℃, with excellent durability and stability, ensuring long-term stable operation of the project and reducing later replacement costs.

Pain Point 4: Poor Adaptability to Multi-scenarios & Climate Zones

Solution: Multi-energy Coupling + Full-scenario Adaptation, Covering Global Needs

• Seamlessly integrate with air-source heat pumps to form a coupled heating system, which preheats the heat pump with solar energy during the day, significantly improving the COP value of the heat pump under low-temperature conditions, solving the heating problem in high-latitude severe cold regions and realizing stable heating throughout the season.

• Widely applicable to global multi-scenarios: commercial buildings (campuses, office buildings, shopping malls), industrial workshops, professional drying rooms (agricultural products, Chinese medicinal materials, industrial products), and central heating in severe cold areas. It can adapt to high-altitude, strong radiation, cloudy and other special climate conditions, meeting the diverse needs of global customers.

Global Application Cases: Proved by Projects in More Than 40 Countries

The DVC Double-pass Evacuated Tube Air Collector has been successfully applied to solar heating and drying projects in more than 40 countries and regions around the world, with outstanding performance in different climate zones and scenarios, winning wide recognition from global customers.

Application Scenario	Target Market	Customer Feedback
Commercial Building Heating	Europe, Southeast Asia	Efficient heating, uniform temperature, and significant energy saving effect, reducing operating costs by 30%+
Industrial Drying	Africa, South America	High temperature up to 280℃, no pollutant emission, fully meeting industrial drying standards
Severe Cold Area Heating	Northern Europe, Central Asia	Stable operation at -30℃, no freezing crack, coupled with heat pump for more efficient heating
High Altitude Area Heating	South Asia, Western China	Strong adaptability to high radiation, stable heat collection, and no maintenance required

Why Choose Soletks DVC Series? Global Partner's Trust Guarantee

For global customers, choosing a solar collector is not only choosing a product but also choosing a reliable partner. Soletks Group, as a benchmark enterprise in the global solar thermal utilization industry, provides comprehensive support for DVC series products, solving all worries for global cooperation.

1. Globally Leading R&D Capability: With 117 core patents and a professional R&D team, it is one of the few enterprises in the world that masters both blue film and black film production technologies. It continuously optimizes product performance according to global climate characteristics and customer needs.

2. Industry 4.0 Intelligent Production: Six modern intelligent production bases realize an efficient production capacity of one collector offline every 55 seconds. The full-chain quality control system from core materials to finished products ensures that each product meets international standards and passes EU CE certification.

3. Full-cycle Global Service: Covering 17 categories and more than 30 global application scenarios, providing one-stop full-cycle services from on-site project survey, customized solution design, to on-site construction and commissioning, with professional teams to respond to customer needs in a timely manner.

4. Globally Recognized Brand Reputation: Ranking second in the world in flat plate collector output, with products exported to more than 40 countries and regions. It has accumulated a reduction of 16.726 million tons of carbon dioxide emissions, winning many international and domestic honors and gaining wide trust from global customers.

Collector type		DVC500	DVC850
outline dimension （mm）		2430×2100×200	4030×2100×200
Specification of double conduit		Φ58×1800	Φ58×1800
Number of dual pipes		30	50
Total area (㎡)		5.1	8.5
Lighting area (㎡)		3.8	6.3
net weight （kg）		75	125
Rated air volume (m³/h)		150	250
Interface size		Φ114
Number of interfaces		4
Total heat loss coefficient		2.1W/(㎡.K)
maximum working temperature		0.76	0.76
Peak efficiency		0.66	0.66
rated efficiency ①		2.5	4.2
specified	400W/m²	0.76	1.62
power （kW）②	700W/m²	1.25	2.69
	1000W/m²	2.5	4.2

Global Cooperation Invitation: Create Green Heating Future Together

The DVC Double-pass Evacuated Tube Air Collector, with targeted solutions for global solar heating pain points, efficient energy saving performance and full-scenario adaptability, is committed to providing green, stable and economical solar heating solutions for global customers, helping countries around the world achieve the "dual carbon" goal.

Whether you are a project contractor, distributor or enterprise purchaser, we sincerely invite you to cooperate with us to share the huge market opportunities of global solar heating and create a green and sustainable future together!