Non - pressure solar water heater |
Non-pressure solar water heater is a kind of compact system of solar collector and water storage tank. The whole system relies on the different density of cold water and hot water, thus Non-pressure solar water heater also called thermo-siphon solar water heater. The system can work without the circulation pump and no heat pipe connection. Cold water directly filled into the vacuum tubes, the vacuum tubes gather energy and heat the cold water, the lighter hot water tank and cold water come down then be reheated. |
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That is how the water does circulation by itself. Please see (fig.1) for its working principle. Non-pressure solar water heater system is most economical and suitable product for low latitude countries and regions, especially for Asian, India, Africa, Oceania, South America and South part of North America. Optional accessories: controller and electrical heater. |
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Product information:
- Product model: i. ECO; ii. AT; iii. EVERHOT
- Vacuum tube: Ø47-1500mm, Ø58-1800mm co-axial structure high borosilicate 3.3 glass vacuum tube.
- Inner tank material: SS304 L (Low Carbon)-2B (Food Grade)Stainless Steel (SAIL/ JINDAL make only)
- Outer tank material: Color powder coating steel / Stainless steel/ Precoated Galvanized (JINDAL/ UTTAM GALVA).
- Frame : Galvanized steel plate with thickness of 1.5mm; MS powder coated 1.5mm thickness.
- Frame angle : 250, 380 or 450
- Capacity of water tank: 98L ~ 288L.
- Heat preservation layer: high pressure automatic polyurethane foaming layer with thickness of 50mm to 55mm.
- Heat preservation : 72 hours.
- Hailstone resistance: Dia≤25mm.
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TECHNICAL SPECIFICATION OF Three – target all – glass vacuum tube
The vacuum tube is the core component of the solar water heater. Its performance is depends on the merits of the film coating technology. Our company using the new gradient coating technology produce three- target vacuum tube and it let the heat gain more than 4%. Increasing intelligent automatic cut Road equipment to ensure the pipe accurately: The reverse osmosis deionized water equipment to protect the inner tube highly clean and control the vacuum process technology to ensure the high vacuum tube collector efficiency and resistance to attenuation performance. Three target coating process, the absorption layer with unique stainless steel aluminum nitride, ultra-pure copper mirror as reflective layer. |
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The production of three-target vacuum tube has three major advantages:
- High temperature resistant absorption layer special stainless steel aluminum nitride,
- resistance to high temperature can reach 5000C.
- film does not fall off, not aging.
Resistance to cold ultra pure copper emission mirror, low reflection, heat loss is small, cold environment set thermal effect is good, so have hot water. |
Efficient absorption high absorption ratio 96%,reflectance is reduced by 65% and heat gain increased by 4% water temperature is higher, more hot water. |
Suitable model: ordinary solar energy water heater (see picture), project heater solar energy water heater (see picture) |
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Three-target vacuum tube performance and specification : |
Tube structure |
All-glass double dock co-axial structure |
Glass material |
High borosilicate 3.3 glass |
Outer tube diameter
and glass thickness |
Φ47±0.7mm:Glass thickness 1.6±0.15mm
Φ58±0.7mm:Glass thickness 1.6±0.15mm
Φ70±0.7mm:Glass thickness 2.0±0.15mm |
Inner tube diameter
and glass thickness |
Φ37±0.7mm:Glass thickness 1.6±0.15mm
Φ47±0.7mm:Glass thickness 1.6±0.15mm
Φ58±0.7mm:Glass thickness 1.6±0.15mm |
Tube length |
800mm, 1200mm, 1500mm,1600mm, 1800mm, 1900mm, 2000mm, 2100mm etc |
Absorption coating property |
Coating material |
CU/SS-ALN(H)/SS-ALN(L)/ALN |
Sediment method |
Three Target magnetron sputtering plation |
Absorptivity |
Absorptivity: a =0.92~0.96(AM1.5) |
Emission ratio |
Emission: ε=0.04~0.06(800C± 50C) |
Vacuum degree |
P≤5.0 × 10-3 (PA) |
Stagnation temperature (temperature inside of empty evacuated tubes) |
260~3000C |
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Average heat loss |
ULT0.4~0.6W/(m2* 0C) |
Hail resistance |
Φ25mm |
Pressure-endure |
1MPa |
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EVACUATED TUBE COLLECTOR (ETC) SOLAR WATER HEATER TECHNICAL DETAILS (DOMESTIC SYSTEMS ) |
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Integrated and pressurized solar water heater |
Integrated and pressurized solar water heater is also called “Pre-heat and pressurized solar water heater.” It’s a new product of us. The whole system combines the advantages of Non-pressure solar water heater and Separated pressurized solar water heater together. The system is put a copper coil inside the Non-pressure solar water heater water tank. There is a pressure exists in the copper coil, the hot water inside the water tank play the role as hot resource. |
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This product improves the problems of traditional solar water heater as limited hot water volume, long heat time, few out water, the worse water quality. The “twice heat exchange “technology makes the high temperature, high efficiency and fast hot water circulation come true. |
The vacuum tube collector absorbs heat energy to heat the water in the storage tank, when opening the valve, cold water flow through the inlet and then to the copper coil, the hot water in the water tank do heat exchange via copper coil with the cold water, when cold water flow through the copper coil, Its temperature been raised gradually, finally the outlet water is hot water (the temperature may be ≤ 50C lower than the hot water in the water tank)The copper coil can bear the pressure of the pressure of the running water. |
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Product information
- Product model: PR-EVERHOT
- Inner tank material: food grade SS304 L (Low Carbon)-2B(Food Grade) (SAIL / JINDAL make only.)
- Outer tank material: Color powder coating steel / Stainless steel/ Precoated Galvanized (JINDAL/ UTTAM GALVA).
- Vacuum tube: Ø58-1800mm/Ø58-2000mm vacuum tube.
- Assistant tank: 5L,7L,10L,12L.
- Recommend copper coil length: 200L and 300L for 35m.
- Frame: Galvanized steel plate with thickness of 1.5mm; MS powder coated 1.5mm thickness Optional angle of frame: 38*/45*
- Pressure bearing: ≤0.7Mpa
- Daili efficiency:≤55% (≤42% in winter)
- Haistone resistance: Dia≤25mm.
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BIGGER EVACUATED TUBE COLLECTOR (ETC) PRESSURIZED SOLAR WATER HEATER TECHNICAL DETAILS |
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COMPARISIOIN BETWEEN ETC SYSTEM & FPC SYSTEM |
Evacuated Tube Collector (ETC) |
Flat plate Colector (FPC) |
1. Quick heat generation. |
Slow heat generation. |
2. Heat absorbing surface is always perpendicular to the sun-rays because of the cylindrical collector glass tube. Hence peak absorbtion always. |
The collector fins and tubes being flat, the incident sun-rays will be at 90 degrees only at noon. So the peak absorbtion is also only during this time. |
3. Vaccum inside the collector tube reduces heat loss at night. |
Heat loss will be more in collector panels at night. |
4. Negligible scaling of tubes –can be cleaned manually (Inner dia 37 min). Consequent loss of efficiency is minimum. |
Heavy scaling of copper tubes which cannot be cleaned manually as bore dia is 12.50mm, causing substantial loss in the efficiency of the system. |
5. Satisfactory performance in cold conditions . |
Performance falls significantly on cloudy and winter days. |
6. Increment in temperature from ambient temperature is 100c to 500c on clear sunny days. |
Increment in temperature from ambient temperature is 100c to 400c on clear sunny days. |
7. Advanced technology at a competitive price. |
Outdated technology, high price. |
7. Less area required for installation. |
Unit occupies huge area. |
8. Incase of collector tubes damage, tubes can be replaced individually. |
Entire glass has to be replaced in case of damage, high cost for replacement. |
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