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138-Ton/Day Solar Hot Water for an Industrial Park in Mianyang, China (Case Study)
138-Ton/Day Solar Hot Water System for the Changhong Intelligent Industrial Park
Engineering flat plate collectors from SOLETKS cover offices and dormitories for thousands of staff while cutting roughly 300 tonnes of standard coal and 800 tonnes of CO₂ a year.
Location
Mianyang, Sichuan, China
Application
Industrial park offices & dormitories
System Type
Engineering flat plate solar hot water
Capacity
138 tons/day hot water supply
Commissioning
2020
Client Type
End owner (Sichuan Changhong)
Background: Rising Hot Water Demand in a Growing Industrial Park
The Changhong Intelligent Industrial Park in Mianyang is a core base for Sichuan Changhong's manufacturing operations, spanning an Economic Development Zone park, an intelligent manufacturing park, and a national innovation park. As the site expanded and more staff settled in, daily hot water demand across offices and dormitories grew steadily.
Traditional fossil-fuel heating carried high energy consumption and operating cost, and it sat awkwardly against the park's green development positioning under China's dual-carbon strategy. The park needed a hot water supply that could scale with headcount without raising its carbon footprint.
In 2020, Changhong launched a dedicated solar heating project with a clear brief: meet the park's daily hot water demand and cut energy consumption at the same time.
The Challenges
A park-scale hot water system has to perform across two very different load profiles and a climate that is not ideal for solar.
High and growing demand
Offices and dormitories for thousands of staff required a stable 138 tons/day supply that could keep pace with the park's expansion.
Weak-light, rainy climate
Mianyang has relatively low solar intensity and many overcast days in autumn and winter, which strains collector yield exactly when demand is steady.
Energy cost and carbon pressure
Fossil-fuel heating was expensive to run and inconsistent with the park's dual-carbon and green-development commitments.
Architectural integration
Collectors had to fit the appearance of workshop and dormitory buildings without disrupting the park's layout.
Solution Overview
After multiple inspections and screening, the project selected engineering flat plate solar collectors from SOLETKS. Flat plate was the right fit here: it integrates cleanly onto large building roofs at scale, handles a continuous domestic hot water load, and tolerates the park's variable weather when paired with the right absorber coating and structural design.
High-efficiency absorber
A selective absorption coating delivers heat absorption efficiency reported at 8–12% above industry average, holding stable yield even under weak winter light.
Weather-resistant build
High-strength corrosion-resistant aluminum frames and ultra-white tempered glass meet national first-class wind- and hail-resistance standards for Mianyang's changeable climate.
Layout optimized by 3D modeling
The installation angle and array arrangement were optimized through 3D simulation to match building layout and integrate with workshop and dormitory aesthetics.
Full-cycle service
Customized engineering plus 24/7 operation and maintenance response keeps the system running stably over its service life.
System Configuration
Engineering Flat Plate Collector
Selective absorption coating · heat absorption efficiency 8–12% above industry average · 15+ year design life
Collector Frame
High-strength corrosion-resistant aluminum alloy · national first-class wind pressure rating
Cover Glazing
Ultra-white tempered glass · national first-class hail resistance
System Output
138 tons/day · serving all park office areas and staff dormitories
Array Design
Installation angle and arrangement optimized via 3D simulation modeling
Service Support
Customized engineering solution · 24/7 O&M response after commissioning
Before vs After
The shift from fossil-fuel heating to solar changes both the park's operating cost base and its emissions profile.
| Indicator | Before (Fossil Fuel) | After (Solar) | Improvement |
|---|---|---|---|
| Energy source | Fossil-fuel heating | Solar thermal | Clean conversion |
| Daily hot water supply | Limited / fuel-dependent | 138 tons/day | Full park coverage |
| Standard coal use | Baseline consumption | Reduced | ~300 t/year saved |
| Annual CO₂ emissions | Baseline | Reduced | ~800 t/year cut |
| Maintenance | Higher, fuel-dependent | Low, 15+ year design life | Lower failure rate |
138 t
Hot water supplied per day
300 t
Standard coal saved per year
800 t
CO₂ cut per year
15+ yr
Equipment design life
Running a factory or industrial park? Get a flat plate hot water system sized to your load.
Request a Similar QuoteKey Takeaways for Industrial Park Projects
For procurement and engineering teams planning a park- or campus-scale hot water system, the lessons here transfer directly.
Match collector type to the site
Flat plate suits large roof areas and continuous domestic hot water loads, and integrates more cleanly with building facades than bulky alternatives.
Size for the absorber, not the brochure
In weak-light, rainy climates, absorber coating efficiency determines real winter yield. Ask for absorption performance, not just peak efficiency.
Design the array before you order
3D layout modeling avoids shading losses and aesthetic conflicts on mixed workshop-and-dormitory sites.
Lock in O&M up front
Park-scale systems need defined maintenance response. A 24/7 O&M commitment protects uptime over a 15+ year life.
Frequently Asked Questions
Why flat plate collectors for an industrial park instead of vacuum tubes?
Flat plate integrates efficiently across large building roofs, handles continuous domestic hot water loads, and is more robust against hail and wind when built to first-class standards — a strong fit for office and dormitory hot water in a mild-but-rainy climate like Mianyang.
Do flat plate collectors still work in cloudy, low-light regions?
Yes, provided the absorber coating is efficient. This project used a selective coating reported at 8–12% above industry average, which keeps heat collection stable through Mianyang's overcast autumn and winter days.
How much can an industrial park save by switching to solar hot water?
In this case the system reduces roughly 300 tonnes of standard coal and nearly 800 tonnes of CO₂ per year. Actual savings depend on local fuel prices, load profile, and irradiance, so figures should be recalculated per site.
How is a large rooftop array kept low-maintenance?
Corrosion-resistant aluminum frames, ultra-white tempered glass to first-class wind and hail standards, and a 15+ year design life reduce failures, backed by 24/7 O&M response.
Can this model be replicated for other factories or campuses?
Yes. The engineering flat plate approach applies to factories, dormitory campuses, and industrial parks internationally, with capacity and array layout sized to each site's hot water demand.
