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DVC500 Solar Air Collector
DVC500 Solar Air Collector
A double-pass vacuum tube solar air heater that delivers clean warm air for space heating, agricultural drying, industrial processes and heat-pump preheating — without freezing, leakage or liquid-loop maintenance.
The DVC500 Solar Air Collector is a double-pass vacuum tube solar air heater that uses air as the heat transfer medium instead of water or glycol. It is designed for projects that need clean warm air for space heating, agricultural drying, industrial drying, ventilation preheating or solar-plus-heat-pump heating support — especially where freezing, leakage and liquid-loop maintenance are major concerns.
For buyers comparing solar thermal options, the DVC500 is not a domestic hot water collector. It is a solar air heating collector. Its value appears when the end use can directly consume warm air.
Why This Product Exists
Many solar thermal systems are built around liquid circulation. That is logical for domestic hot water and hydronic heating, but it also introduces several engineering risks:
freezing in cold climates;
leakage at fittings, manifolds or pipes;
corrosion and scaling inside the hydraulic loop;
pump, valve and pressure maintenance;
antifreeze replacement;
system shutdown risk when liquid-side protection fails.
The DVC500 solves a different problem. It converts sunlight into warm air directly. Air enters the collector, passes through the double-pass vacuum tube structure, absorbs heat and is then delivered to the building, drying chamber, duct system or heat pump intake.
Because the heat transfer medium is air, the system avoids the most common liquid-loop failure modes. This is especially valuable for remote farms, mountain buildings, cold-region heating, seasonal facilities, agricultural drying rooms and industrial air heating applications.
Key Product Benefits
| Buyer Concern | DVC500 Response |
|---|---|
| Freezing in winter | Air does not freeze inside the collector loop. |
| Leakage risk | No water or glycol circulates inside the collector tubes. |
| Maintenance | No antifreeze replacement, scaling treatment or pressure-loop servicing. |
| Warm-air demand | Heated air can be used directly for space heating, drying or ventilation preheating. |
| Cold climates | Vacuum tube insulation helps reduce heat loss when outdoor temperature is low. |
| Drying quality | Clean warm air supports controlled drying without combustion exhaust in the drying chamber. |
| Heat pump support | Solar preheated air can improve winter intake conditions during sunny periods. |
Technical Architecture
The DVC500 is built around a direct-flow, double-pass vacuum tube design. The collector uses a front-to-rear air channel inside the tube, allowing air to move through the heated zone with reduced resistance and improved heat exchange. Three technical features matter most.
Air as the Working Medium
Air is safe, stable and available everywhere. Unlike water, it does not freeze, boil, leak into buildings or require chemical treatment. A fan moves air through the collector and into the target process — space heating, fresh-air preheating, greenhouse heating, agricultural and industrial drying, storage-room temperature support, or heat pump intake preheating.
Double-Pass Vacuum Tube Flow Path
The DVC double-pass structure improves contact between air and the heated surface while keeping airflow resistance manageable. Soletks product information states the streamlined air channel can reduce internal air resistance by more than 30% compared with typical solar air heaters — important because lower resistance directly cuts fan power.
Selective Absorption Coating
The vacuum tubes use a selective coating designed to absorb solar radiation and reduce heat emission. Published DVC values: solar absorptance 93% ± 2%, thermal emittance 6% ± 2% at 80 °C, and solar-to-heat conversion above 80% under suitable conditions.
Coating & Conversion Values
| Coating Parameter | Published Value |
|---|---|
| Solar absorptance | 93 percent ± 2 percent |
| Thermal emittance | 6 percent ± 2 percent at 80 °C |
| Solar-to-heat conversion | Above 80 percent under suitable conditions |
These values matter because the collector may operate in winter, cloudy weather or high-altitude locations where useful heat depends on both solar absorption and heat retention.
Product Views
Perspective view — full assembly
Manifold side — air outlet
Front view — 30 dual pipes
DVC500 Specification Snapshot
| Parameter | DVC500 |
|---|---|
| Product type | Double-pass vacuum tube solar air collector |
| Heat transfer medium | Air |
| Outline dimension | 2430 × 2100 × 200 mm |
| Double conduit specification | Φ 58 × 1800 mm |
| Number of dual pipes | 30 |
| Typical use | Heating, drying, ventilation preheating, heat pump preheating |
| Liquid-loop requirement | None |
Project output depends on solar irradiation, outdoor temperature, airflow rate, duct resistance, fan selection, collector angle, installation direction and operating schedule. Final values should be confirmed during project design.
Where DVC500 Performs Best
Commercial & Institutional Space Heating
Schools, workshops, stations, dormitories and rural public buildings — solar-warmed air during daytime occupancy reduces the boiler / heat-pump load.
Agricultural Drying
Herbs, flowers, fruit slices, seeds, grain, mushrooms, biomass and wood — clean warm air without combustion exhaust in the drying chamber.
Industrial Air Heating
Product drying, moisture control, preheating or warehouse temperature support during daytime operations.
Cold-Region & Heat-Pump Preheating
Preheats air before it enters a heat pump or building ventilation system — fewer defrost cycles, lower electricity use.
Solar thermal wind drying system — principle diagram
DVC500 vs Other Solar Heating Technologies
| Technology | Best Use | Limitation |
|---|---|---|
| DVC500 solar air collector | Warm air for heating, drying and ventilation preheating | Not designed for domestic hot water production |
| Flat plate water collector | Commercial hot water and low-temperature hydronic heating | Requires freeze and leakage protection |
| Evacuated tube water collector | Hot water in colder climates | Still requires liquid loop maintenance |
| Standard PV panel | Electricity generation | Does not provide useful heat |
| Air-based PVT module | Electricity plus warm air from one roof area | More complex than single-output collectors |
The correct choice depends on the final energy demand. If the project needs warm air, the DVC500 is more direct than a water-based collector. If the project needs hot water, a flat plate or evacuated tube water collector is usually more suitable.
Design Inputs Needed for Sizing
To prepare a useful quotation, Soletks needs more than the number of collectors requested. A good solar air heating design starts from the heat demand.
project location and altitude;
monthly outdoor temperature range;
target application (heating, drying, ventilation, heat-pump preheating);
daily operation schedule;
target outlet air temperature;
required airflow or room volume;
available roof or ground installation area;
duct distance from collector to load;
backup heating source;
local wind, snow and structural conditions;
whether the project is new construction or retrofit.
With these inputs, the collector area, fan size, duct layout and control logic can be selected more accurately.
Simple Engineering Logic
A solar air collector project should be evaluated by useful delivered heat, not only by collector area. The useful heat delivered by an air system can be estimated by:
Useful heat = airflow × air heat capacity × temperature rise
In practical project design, the engineer must also consider:
collector efficiency under actual temperature difference;
duct heat loss;
fan electricity consumption;
airflow balance across multiple collectors;
outlet temperature required by the process;
whether the load can use heat during sunny hours.
This is why a DVC500 system should be designed as a complete air heating system, not only as a collector purchase.
Installation Notes
Orientation & Tilt
For heating applications in the northern hemisphere, collectors usually face south and are tilted to prioritize winter solar gain. Local latitude, roof angle, snow load and structure should be considered.
Air Ducts
Size ducts to limit pressure drop. Long runs, sharp bends and undersized ducts reduce airflow and increase fan power. Insulated ducts are recommended for long distances or low outdoor temperatures.
Controls
The fan should run only when collector outlet air is warmer than the target air stream. A differential temperature controller prevents pushing cool air into the building or drying chamber.
Backup Heat
Solar air heating is a fuel-saving system, not a 24-hour standalone heat source unless paired with storage and backup. A reliable backup system should be included for night and low-sun periods.
Procurement Checklist
Before ordering a DVC500 system, confirm:
collector model and quantity
mounting structure type
fan and duct requirements
expected airflow per collector group
controller configuration
target outlet temperature range
shipping dimensions and packaging
installation manual availability
warranty terms
spare parts availability
after-sales support for project integration
Why Buy from Soletks
Soletks manufactures and supplies solar thermal and hybrid energy products for commercial, industrial, agricultural and building energy projects. Its product range includes solar air collectors, flat plate solar collectors, evacuated tube collectors, solar hot water systems and PVT modules.
The DVC500 is suitable for customers who need a factory-direct solar air heating product with project support — distributors, EPC contractors, agricultural drying equipment companies, industrial energy integrators and heating system installers.
FAQ
What is a DVC500 solar air collector?
It is a double-pass vacuum tube solar air heater that uses air as the heat transfer medium. It produces warm air for heating, drying, ventilation preheating and heat pump preheating.
Is the DVC500 a solar water heater?
No. It is a solar air collector. If the project needs domestic hot water, a flat plate or evacuated tube water collector is usually more appropriate.
Can it work in freezing climates?
Yes. Since air is the working medium, there is no liquid inside the collector loop to freeze. Duct insulation and backup heating still need to be designed for winter operation.
Can DVC500 be used for greenhouse heating?
Yes. It can provide daytime warm-air support for greenhouses. It should be combined with proper airflow distribution, temperature control and backup heating.
Can it be used for industrial drying?
Yes. It can support drying where clean warm air is needed. Final performance depends on product moisture, drying temperature, airflow rate and local solar resources.
What should I send for a quotation?
Send your location, application, required airflow, target temperature, available installation area, operating schedule and photos or drawings of the installation site.
Request a Project Review
If your project needs warm air rather than hot water, the DVC500 may be the right technical path. Send Soletks your heating or drying requirement — our team will review collector quantity, duct concept and system configuration for quotation.
