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Click on to view Specifications.
The JNJ SOLAR collector can be installed on most roof surfaces, and can easily be adjusted to achieve the perfect incidence angle. All nuts and bolts are made of stainless steel. Installation is very quick and easy.
Please click here to download a PDF of Frame Assembly Instructions. |
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| The JNJ SOALR evacuated tube is actually a concentric-glass product with improved geometry and performance. Two concentric glass tubes are closed on one side, forming a hemisphere, and fused and hermetically sealed with each other on the other side (evacuated insulation).To use solar energy, the internal glass tube is coated with an environmentally friendly, highly absorbing layer on the outside, thus turning it into an absorber. The coating is protected in the evacuated space. The aluminum nitride sputter coating used is characterized by extremely low emission. |
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JNJ SOLAR-APOLLO evacuated tubes, three- target plates, sputtering, selective-coating surface ( also called ?Double M-ALN cermet( composite material composed of ceramic and metallic particles) layers ),developed from the basic standard evacuated tubes, these tubes have higher absorption (> 95 %) and lower emittance (< 5 %) than the traditional selective coated surfaces. The sputtering selective-coating absorber has high resistance to long-term vapor condensation, corrosive sulfur dioxide and high operating temperature. The effective resistance measured in the test is equivalent to a product life span exceeding 15 years. Good absorber material should have excellent heat transmission, good resistance to corrosion as well as good welding ability.
The sputtering is a physical, manufacturing, process that involves coating a substrate with metal particles. The manufacturing process takes place in a high vacuum chamber and the coating process involves three stages: stabilizing layer coating, semi-conductor layer coating (radiation absorbent layer) and anti-reflection layer coating, as shown in the following diagram. |
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The first deposit is a copper metal layer, which has a low emission ratio and high thermal transmission through the inner glass wall to the refrigerant heat pipe.
The second deposit is ionized stainless steel, sputtered simultaneously in a gas mixture of argon and nitrogen to produce a cermet layer.
The third deposit is aluminum nitride which absorbs solar radiation at a very low emissivity, a = 95%; e = 5%.
In the vacuum chamber three target plates are installed above the copper fin. By creating a high-tension field between the targets and the copper fin and a magnetic field parallel to the target plates, positive helium ions release titanium atoms from the target plate. The atoms strike the copper fin and because of the high kinetic energy of the atoms they attach themselves to the top of the copper fin. During the process this copper fin passes three targets plates. |
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A stabilizing layer of metal is laid on the copper fin. This layer gives the surface of the copper fin long-term stability.
In this semi-conductor layer Cu atoms are orientated in such a way that 98% of incoming solar radiation can be absorbed. Finally, a transparent ALN or ALNxoy anti-reflection layer is added to the absorbent layer to enhance solar absorption. The anti-reflection layer has a very low reflection index and can let 98 to 99 % of incident solar radiation pass through the layer to be absorbed by the semi-conductor layer. Thus, A solar absorptance of 0.94 - 0.96 with an emittance of 0.04 - 0.06 at 100oC has been achieved.
Advanced solar selective coatings employ two patent technologies:
(1) double cermet film structure with the highest photo thermal efficiency
(2) metal-Aluminum nitride cermet (M-AlN) materials deposited by a novel sputtering technology.
The typical film structure of M-AlN cermet selective surfaces: |
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The layer of reflection reducing layer will reduce the reflection ratio, improve the efficiency of heat collection and increase the absorption performance of the sun's rays. The reflection ratio will be reduced by 30%-40%.
The mirror surface red copper and stainless steel absorbing film are used on double reflecting layers to reduce heat emittance and heat loss, and improve the performance of heat preservation.
The absorbing layer has a special intervention film of stainless steel aluminum nitride metallic, ceramic, composite, working normally with temperatures as high as 300oC. Aging resistance: no color fading for 15 years. High heat collection: absorbing ratio is improved by 15%.
JNJ SOLAR-APOLLO evacuated tubes make use of advanced Stainless steel ALN "THREE-TARGET" sputtering technique ( while standard tube is one-target sputtering ),so that they can stand up to very high temperatures, especially the film, which is 20-30mm from the seals.( JNJ SOLAR's standard tube is 30 -35mm ). “Apollo?solar collector evacuated tubes can also absorb solar Infrared rays, so they are more effective than common evacuated tubes.
APOLLO evacuated tubes contain a larger condenser on the heat pipe. The condenser diameter is 24 mm, not the common 14 mm and is coated with nickel so that APOLLO tubes have a much better heat output per tube than the standard tube.
Comparison between Standard Tube and APOLLO Tube as shown below: |
Click on to view Specifications. |
Click on to view Specifications. |
Please click here to download a PDF of System Controller Instructions. |
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