Chairman Han Rongtao of Soletks Group Invited to Attend the “2025 International Renewable Energy Heating Technology Conference”

Amid the global push for a green, low-carbon energy transition and the critical phase of advancing “dual carbon” goals, the “2025 International Renewable Energy Heating Technology Conference” opened grandly in Handan, Hebei Province on March 29, 2025. Hosted by the National Solar Thermal Industry Technology Innovation Strategic Alliance (National Solar Thermal Alliance), the event gathered around 300 key players: officials from the National Energy Administration, leaders of Hebei Province and Handan City, experts from over 20 universities (e.g., Tsinghua University, Harbin Institute of Technology, Germany’s University of Stuttgart), 30+ research institutions, and 100+ leading enterprises. Under the theme “Technological Innovation Drives High-Quality Renewable Energy Heating Development”, attendees discussed industry opportunities, cutting-edge tech directions, and future trends, building a high-level global cooperation platform.

As a senior engineer and leader of a top clean heating enterprise, Mr. Han Rongtao, Chairman of Soletks Group, was invited for his profound contributions to solar thermal utilization. He delivered a keynote report titled Research and Application of Ultra-Large Thermal Flat Plate Collectors in Solar District Heating (SDH) at the main forum. Combining Soletks’s R&D practices and project cases, Han analyzed how ultra-large flat plate collectors innovate district heating, offering valuable solutions to industry bottlenecks. His report won warm applause, boosting the conference’s energy.

I. Solar Heating: A “Green Engine” for Dual Carbon Goals

China’s energy transition faces challenges like over-reliance on high-energy sources and the need for clean tech breakthroughs. Solar energy—inexhaustible, pollution-free, and low-cost—has become a key tool for clean heating. In recent years, its heating application has expanded from northern cold regions to multiple provinces, covering residences, commercial buildings, and public facilities. According to the National Solar Thermal Alliance’s 2024 China Solar Thermal Industry Report (Dec 8, 2024), solar heating systems accounted for 9.14% of total clean heating in 2024 (up 1.2% from 2023), solidifying its status as a “new favorite” in the field.

With tech upgrades, solar thermal use has broken traditional limits. Once focused on domestic hot water, it now extends to building energy, drying, agricultural breeding, and industrial heat supply—achieving a leap from “solar hot water” to “full-scenario clean thermal energy” and supporting low-carbon transitions across industries.

II. EFPC Large Flat Plate Collector: A Tech Innovation

Soletks’s EFPC High-Efficiency Integrated Large Flat Plate Collector is a landmark in solar thermal tech. It overcomes traditional collectors’ inefficiencies and narrow use cases, cuts solar heating costs, boosts solar energy’s market competitiveness, and accelerates global low-carbon energy transition.

Featuring a “large flat plate design”, the EFPC collector offers large heat-collecting area, high integration, strong stability, and a 15+ year lifespan. Soletks’s R&D breakthroughs include:

1. PVD (Physical Vapor Deposition) tech: Builds coating structures at the atomic level, achieving over 95% solar absorption and below 5% heat emission to minimize loss.

2. Cylindrical/flat sputtering cathodes: Ensures precise control of selective absorption coating thickness and uniformity for consistent efficiency under varying light.

3. Exclusive Bonding tech: Strengthens heat absorber-heat transfer connections, expands heat transfer area, and raises photothermal conversion efficiency by 30%+ vs. traditional models, enhancing reliability in extreme temperatures.

The EFPC collector serves diverse needs: urban central heating, distributed heating (residential/commercial), commercial hot water (hotels/schools), industrial heat (food/chemicals), agricultural heat (greenhouses/breeding), and agricultural drying (grain/fruits). Its performance stands out: peak instantaneous efficiency (0.81, above industry average), low heat loss (4.5W/(㎡·K)), and high integration—saving 62% floor space, 64% pipeline length, 80% installation time, and boosting efficiency by 60% vs. traditional collectors. It won the 2024 “Shandong Provincial Science and Technology Award” (Cert No.: JB2023-2-113-D04).

III. Practical Application: High-Altitude Project Success

The EFPC collector’s performance is proven in real projects. High-altitude areas in China struggle with stable clean heating due to cold climates and poor lighting. Soletks used EFPC tech to build the world’s first Chinese-made alpine high-altitude solar central heating project—located at 4,600m on the Qinghai-Tibet Plateau, it covers 107,000 ㎡ and has a 15,000 ㎡ heat storage tank. Its “daytime collection, night storage, on-demand supply” mode ensures stable heating for 2,000+ households even at -25℃ in winter. To date, the EFPC collector has served 1.18 million ㎡ of heating area across China, benefiting tens of thousands of families and enterprises.

IV. T/PV Pro System: New Combined Heat-Power Solution

Han also highlighted Soletks’s T/PV Pro Solar Thermoelectric Twin System at the conference. Integrating “light, electricity, heat, and storage”, it enables combined heat and power supply on one component—breaking traditional solar products’ “single energy” limit. Its core: Collects heat generated during solar cell photoelectric conversion, uses intelligent temperature control to keep cell surface at 25~45℃ (optimal for power generation), increasing lifetime power output by 10%+ while producing 2x more heat than electricity—maximizing solar resource use.

Tech details: Filled with 99.99% high-purity inert gas and 3-layer encapsulation (isolates moisture/dust for stable operation in harsh environments). It achieves over 80% solar spectrum capture efficiency and up to 88% combined electricity-heat instantaneous efficiency. Applications include greenhouse breeding, RV camping, factories/schools, border outposts, households, and off-grid oil fields/mines. Its design and performance won universal on-site recognition.

V. Future Outlook: Innovating for Dual Carbon Goals

Han emphasized that Soletks’s achievements stem from its “innovation as core competitiveness” philosophy. Future plans: Increase R&D investment to advance EFPC and T/PV Pro tech, expand use cases, and deepen industry-university-research cooperation to solve tech challenges—contributing more to China’s energy transition and “dual carbon” goals.

Han’s conference participation and keynote reflect the industry’s recognition of Soletks’s strength and its commitment to global renewable energy heating. Driven by innovation, Soletks will continue leading the clean heating industry and fueling the green low-carbon energy system.